https://www.hairizuan.com/ Recent content on Experiment, Fail, Learn, Repeat Hugo -- gohugo.io Copyright © 2017 - Hairizuan Noorazman Sun, 22 Mar 2026 00:00:00 +0000 https://www.hairizuan.com/policy/ Tue, 05 Sep 2023 00:00:00 +0000 https://www.hairizuan.com/policy/ Privacy Policy for www.hairizuan.com Last updated: 5 September 2023 At hairizuan.com (hereinafter referred to as “we,” “us,” or “our”), we take your privacy seriously. This Privacy Policy outlines how we collect, use, disclose, and safeguard your personal information when you visit our blog, www. https://www.hairizuan.com/rgoogleslides/ Tue, 01 Jan 2019 00:00:00 +0000 https://www.hairizuan.com/rgoogleslides/ Privacy Policy The rgoogleslides package includes a default google credentials in order to make it easier to try the following package. (It is recommended for you to use your client id/client secret from your own Google Project though) https://www.hairizuan.com/speaker-profile/ Tue, 01 Jan 2019 00:00:00 +0000 https://www.hairizuan.com/speaker-profile/ Bio Hairizuan is a Devops Engineer at Kiteworks. He is a avid fan of tools and technologies and has dabbled in various programming languages such as Golang, Python, Elm and R. https://www.hairizuan.com/tools/ Tue, 01 Jan 2019 00:00:00 +0000 https://www.hairizuan.com/tools/ The following page lists out all the tools that are being built and then embeded to this blog Lifestyle BMI Calculator Bus Arrival https://www.hairizuan.com/about/ Wed, 09 Apr 2014 00:00:00 +0000 https://www.hairizuan.com/about/ Below is a collection of some of projects I’ve been working on. These are not code snippets but of tools/internal libraries I’ve built to solve issues that I have in the past https://www.hairizuan.com/measuring-coding-tool-effectiveness/ Sun, 22 Mar 2026 00:00:00 +0000 https://www.hairizuan.com/measuring-coding-tool-effectiveness/ Most online content regarding AI coding tools focuses heavily on input and output token counts. While these metrics are useful for understanding the raw volume of data processed, they often fail to address the actual effectiveness of those tokens in solving real-world engineering problems. https://www.hairizuan.com/building-a-dictation-app-with-swift/ Sun, 15 Mar 2026 00:00:00 +0000 https://www.hairizuan.com/building-a-dictation-app-with-swift/ I’ve been wanting to reduce the amount of typing I do on a daily basis. Between writing messages, emails, and documentation - there’s a lot of text to produce. macOS does have a built-in dictation feature but I had concerns about its accuracy - it relies on a model running locally on the Mac, and I figured a cloud-based speech-to-text service would produce better results, especially for technical jargon and longer dictation sessions. https://www.hairizuan.com/learnings-from-building-agents/ Sun, 01 Feb 2026 00:00:00 +0000 https://www.hairizuan.com/learnings-from-building-agents/ I’ve tried to build a bunch of AI agents at work for a variety of purpose and with that, learnt a couple of interesting properties out of it: Should it even be an agent? https://www.hairizuan.com/learnings-from-using-claude-code/ Sun, 25 Jan 2026 00:00:00 +0000 https://www.hairizuan.com/learnings-from-using-claude-code/ Here are some of the learnings for using Claude Code. This will be a running document of learnings as we go along for the ride of using this tool Last update: 26 January 2026 https://www.hairizuan.com/monitoring-jenkins-via-prometheus/ Mon, 25 Aug 2025 00:00:00 +0000 https://www.hairizuan.com/monitoring-jenkins-via-prometheus/ It is pretty important to understand how our jenkins job is running. We can technically keep querying the jenkins server via jenkins API but that would mean trying to parse the every changing response - which could be quite a painful process to go through. https://www.hairizuan.com/using-alloy-and-grafana-for-extracting-metrics-and-pushing-to-dashboard/ Wed, 20 Aug 2025 00:00:00 +0000 https://www.hairizuan.com/using-alloy-and-grafana-for-extracting-metrics-and-pushing-to-dashboard/ I need to deploy a metrics exporter to check for nodes on instances and push it into a grafana metrics dashboard We can demonstrate this with 2 instances Deploy alloy to collect Node Metrics We would first install alloy of the instance we would want to monitor. https://www.hairizuan.com/backfilling-logs-on-loki-grafana-stack/ Fri, 15 Aug 2025 00:00:00 +0000 https://www.hairizuan.com/backfilling-logs-on-loki-grafana-stack/ I have a small engineering problem to resolve which to export logs from an android application and save it into a monitoring stack of sorts. The logs are mostly only for debugging purposes because its a pure pain to try to go chat with the user that holds the phone in order to debug the issue. https://www.hairizuan.com/container-signing-experimentation/ Thu, 31 Jul 2025 00:00:00 +0000 https://www.hairizuan.com/container-signing-experimentation/ One of the major things that I was researching on for security stuff for distributing software is the capability to answer “is this software produced from your company”? This led me to a rabbit hole for the signing mechanism for containers. https://www.hairizuan.com/trying-zfs-filesystems/ Sun, 20 Jul 2025 00:00:00 +0000 https://www.hairizuan.com/trying-zfs-filesystems/ There is a technical challenge and interesting requirement in my job that requires lightweight snapshot capability of a folder/set of files. Technically, it should be ok to simply create a volume snapshot on the cloud vendor of this - however - creating such snapshots actually take a lot of time and potentially, a lot of space - it’s not the cheapest solution for this. https://www.hairizuan.com/solving-the-file-sync-bottleneck-in-tests-how-torrenting-could-be-the-answer-part-1/ Tue, 01 Jul 2025 00:00:00 +0000 https://www.hairizuan.com/solving-the-file-sync-bottleneck-in-tests-how-torrenting-could-be-the-answer-part-1/ At my job, one recurring technical challenge has been syncing massive files—often ranging from 10GB to 20GB—across multiple servers. We’re essentially copying over large iso files around to various servers. The current process still somewhat works but it is bandwidth-intensive, and increasingly difficult to manage as our the number of servers we need to sync this large file grows. https://www.hairizuan.com/gke-as-gitlab-runner/ Tue, 08 Apr 2025 00:00:00 +0000 https://www.hairizuan.com/gke-as-gitlab-runner/ Part of my job involves me dealing with Gitlab on a daily basis. Gitlab is a complicated beast to handle and it took a while to get around the various features that the product offers. https://www.hairizuan.com/configuring-compute-storage/ Tue, 01 Apr 2025 00:00:00 +0000 https://www.hairizuan.com/configuring-compute-storage/ When we initially start playing around with compute instances in the cloud, we generally just deploy instances without thinking too much about it. We don’t think about the application requirements or how CPU or Memory may require. https://www.hairizuan.com/building-a-code-assessment-tool-but-in-kubernetes/ Sun, 10 Nov 2024 00:00:00 +0000 https://www.hairizuan.com/building-a-code-assessment-tool-but-in-kubernetes/ Container based security measures Smaller images for code execution platform Not running the container as root Kubernetes related Run the deployment in different namespace Setting up a new Service account in kubernetes Ensuring service account token is not mounted in potentially vulnerable pods Ensuring that the container is started with non-root access Ensuring resource limits are set Set security context Setting network policy Using a stricter seccomp/apparmor profile Tool related Ensure limited logs sniffed Ensure that there is a time limit of code executions Future efforts I had previously attempted to build a code assessment tool in docker. https://www.hairizuan.com/connect-slaves-jenkins-configured-with-jcasc-docker/ Wed, 10 Jan 2024 00:00:00 +0000 https://www.hairizuan.com/connect-slaves-jenkins-configured-with-jcasc-docker/ This is a continuation of the previous blog post for automating Jenkins server setup. The previous setup only created a setup for a single node Jenkins build server farm. This definitely won’t be sufficient for larger teams where they would be building applications and running workflows on a more frequent basis. https://www.hairizuan.com/automating-jenkins-initial-setup/ Wed, 03 Jan 2024 00:00:00 +0000 https://www.hairizuan.com/automating-jenkins-initial-setup/ Jenkins, a pretty popular Continuous Integration/Continuous Deployment (CI/CD) build tool, plays a pivotal role in automating the software development/deployment process. Over the years, Jenkins has evolved to become an extremely versatile automation server that facilitates continuous integration and delivery by orchestrating the building, testing, and deployment of code. https://www.hairizuan.com/building-rpms-and-storing-it-in-artifact-registry/ Wed, 27 Dec 2023 00:00:00 +0000 https://www.hairizuan.com/building-rpms-and-storing-it-in-artifact-registry/ Introduction When one mentions about application packaging - the usual first thought that can cross a person’s mind is how the application would be packaged in docker containers. That is a somewhat fair thing to think about - containers have gotten pretty common in developer circles. https://www.hairizuan.com/github-actions-for-shopping-list-application/ Wed, 20 Dec 2023 00:00:00 +0000 https://www.hairizuan.com/github-actions-for-shopping-list-application/ I have a basic shopping list application that is available in the following code base: https://github.com/hairizuanbinnoorazman/Go_Programming/tree/master/Apps/shopping-list. This is a simple Golang application that also embeds a generated javascripts that has been transpiled into Javascript files. https://www.hairizuan.com/using-terraform-for-deploying-databases-and-applications-in-google-cloud/ Wed, 13 Dec 2023 00:00:00 +0000 https://www.hairizuan.com/using-terraform-for-deploying-databases-and-applications-in-google-cloud/ Over the past few months, I have been toying with the idea of going all in with Ansible or all in with Terraform. Both tools are pretty popular tools when it comes to application and tools deployment. https://www.hairizuan.com/nginx-as-api-gateway-focusing-on-auth_request-directive/ Wed, 01 Nov 2023 00:00:00 +0000 https://www.hairizuan.com/nginx-as-api-gateway-focusing-on-auth_request-directive/ On virtual machine How to “protect” api requests https://www.nginx.com/blog/deploying-nginx-plus-as-an-api-gateway-part-1/ Mostly is the auth_request directive Microservices are a software architectural style that structures an application as a collection of loosely coupled, independently deployable services. https://www.hairizuan.com/system-design-notes/ Wed, 18 Oct 2023 00:00:00 +0000 https://www.hairizuan.com/system-design-notes/ General framework for system design interviews From the following website: https://www.youtube.com/watch?v=i7twT3x5yv8 Specify Requirements Design High Level Functional Components Deep dive to specific “interesting” pieces of the components https://www.hairizuan.com/access-cloud-sql-from-google-cloud-run-without-serverless-vpc-access-connectors-but-via-vpc/ Wed, 11 Oct 2023 00:00:00 +0000 https://www.hairizuan.com/access-cloud-sql-from-google-cloud-run-without-serverless-vpc-access-connectors-but-via-vpc/ Introduction Previously, Serverless VPC Access connector is a commonly used solution to connect Cloud Run to Cloud SQL securely. This option is still available for use today but with all the previous blog posts that cover how we can: https://www.hairizuan.com/multiple-database-support-mysql-and-sqlite-support/ Wed, 04 Oct 2023 00:00:00 +0000 https://www.hairizuan.com/multiple-database-support-mysql-and-sqlite-support/ I intend to try out the Turso service in order to see if there is any other potential serverless database that would have pretty decent type of billing for small projects. https://www.hairizuan.com/serverless-applications-with-cloud-run-with-serverless-mysql-from-planetscale/ Wed, 27 Sep 2023 00:00:00 +0000 https://www.hairizuan.com/serverless-applications-with-cloud-run-with-serverless-mysql-from-planetscale/ Serverless computing, as seen in platforms like Cloud Run or AWS Lambda, allows developers to run code without managing the underlying infrastructure. This is achieved by automatically scaling the resources based on the incoming requests, and users are billed based on the actual execution time and resources consumed during each function or container invocation. https://www.hairizuan.com/access-cloud-sql-from-google-kubernetes-cluster-without-cloud-sql-proxy/ Wed, 20 Sep 2023 00:00:00 +0000 https://www.hairizuan.com/access-cloud-sql-from-google-kubernetes-cluster-without-cloud-sql-proxy/ Introduction Similar to my previous blog post, we would usually be connecting Google Kubernetes Engine (GKE) clusters to Cloud SQL databases by using the Cloud SQL Proxy. However, we can now use Private Service Connect, which allows for private communication between different Google Cloud services, similar to how we did for connecting our application in Google Compute Engine (VM) to a Cloud SQL instance. https://www.hairizuan.com/access-cloud-sql-from-google-compute-engine-without-cloud-sql-proxy/ Wed, 13 Sep 2023 00:00:00 +0000 https://www.hairizuan.com/access-cloud-sql-from-google-compute-engine-without-cloud-sql-proxy/ Traditionally, when connecting a Google Compute Engine instance to a Cloud SQL database, the Cloud SQL Proxy was commonly used to facilitate secure connections. The Cloud SQL Proxy acted as an intermediary between the application running on a Compute Engine instance and the Cloud SQL database. https://www.hairizuan.com/persistance-in-google-cloud-run-with-fuse-storage-to-google-cloud-storage/ Wed, 06 Sep 2023 00:00:00 +0000 https://www.hairizuan.com/persistance-in-google-cloud-run-with-fuse-storage-to-google-cloud-storage/ Google Cloud Run is a serverless compute platform that automatically scales applications in response to traffic. It is designed to run stateless containers, meaning that the instances of your application are ephemeral and can be spun up or down as needed. https://www.hairizuan.com/accessing-google-compute-instances-via-cloud-run/ Wed, 30 Aug 2023 00:00:00 +0000 https://www.hairizuan.com/accessing-google-compute-instances-via-cloud-run/ The typical way to access Google compute instances from Cloud Run is usually done via the Serverless VPC Access. However, setting this up would mean that we are essentially create an instance that would be used as a proxy to send traffic from Cloud Run to the Google Compute instance. https://www.hairizuan.com/storing-helm-in-docker-registries/ Wed, 23 Aug 2023 00:00:00 +0000 https://www.hairizuan.com/storing-helm-in-docker-registries/ We can apparently now store helm charts in Docker registries - this was made available via helm commands since v3.8.0. https://helm.sh/docs/topics/registries/ Now with that being available for use, we can now use it across a variety of storage mechanism (as compared in the past when the artifacts produced through it has to be managed in some of file system and would require some of index file to list all available helm charts available). https://www.hairizuan.com/python-call-golang-functions-via-wasm/wasi/ Wed, 16 Aug 2023 00:00:00 +0000 https://www.hairizuan.com/python-call-golang-functions-via-wasm/wasi/ Inspirations While I was watching the following video of a talk by Richard Feldman: https://www.youtube.com/watch?v=zX-kazAtX0c&ab_channel=ChariotSolutions. He was covering a pretty interesting concept/topic of how would one “slowly” migrate codebases from one language to another. https://www.hairizuan.com/writing-code-to-store-items-in-memory-with-golang-but-with-maps/ Wed, 09 Aug 2023 00:00:00 +0000 https://www.hairizuan.com/writing-code-to-store-items-in-memory-with-golang-but-with-maps/ The following blog post is a continuation of the previous blog post on Writing code to store items in memory with Golang. The previous blog post was mostly to cover simpler cases where we storing something simple like data in a single array/slice. https://www.hairizuan.com/writing-code-to-store-items-in-memory-with-golang/ Wed, 02 Aug 2023 00:00:00 +0000 https://www.hairizuan.com/writing-code-to-store-items-in-memory-with-golang/ I have a small tiny application that is a http api server that is meant to store data temporarily in memory. There is no need to persist data into any file or even database. https://www.hairizuan.com/using-emulators-for-testing-google-cloud-datastore-integration/ Wed, 26 Jul 2023 00:00:00 +0000 https://www.hairizuan.com/using-emulators-for-testing-google-cloud-datastore-integration/ Motivation for finding emulator for Google Cloud Datastore Many applications out there in the real world would require the use of databases to persist data. In the cases where an application depends on databases such as mysql or mariadb or postresql, we can create some form of “staging” server where we can test that the application works as expected. https://www.hairizuan.com/heap-datastructure-with-slices/arrays-in-golang/ Wed, 19 Jul 2023 00:00:00 +0000 https://www.hairizuan.com/heap-datastructure-with-slices/arrays-in-golang/ Part of the software engineer journey is to learn data structures - especially if one were to go for the software interviews. Surprising, data structures knowledge and familiarity with it becomes somewhat important in them - with knowledge with certain data strucutre, certain problems become somewhat easier (also, sometimes, all one can do is simply stare in wonder at the algorithms and data structures that people in the past created) https://www.hairizuan.com/deploy-golang-apps-that-interact-with-headless-service-in-kubernetes/ Wed, 12 Jul 2023 00:00:00 +0000 https://www.hairizuan.com/deploy-golang-apps-that-interact-with-headless-service-in-kubernetes/ In certain application scenarios - there is a need to have applications that need to do client side load balancing to a bunch of servers. Such cases are pretty rare - but we won’t be covering the exect reasons or scenarios or when these are needed. https://www.hairizuan.com/redis-vs-memcached-via-golang/ Wed, 05 Jul 2023 00:00:00 +0000 https://www.hairizuan.com/redis-vs-memcached-via-golang/ This is often a question that often comes up during system design interviews. If one were to design a system that requires the use of cache - one common question that comes up would be whether to use memcached or to use redis. https://www.hairizuan.com/trying-to-create-mariadb-replica-server/ Wed, 28 Jun 2023 00:00:00 +0000 https://www.hairizuan.com/trying-to-create-mariadb-replica-server/ A common architectural pattern for relational databases is to create an additional replica server. This pattern usually come up due because most applications are usually read heavy - data is usually read to be presented to users. https://www.hairizuan.com/replicating-golang-interfaces-with-static-python-run-with-mypy/ Wed, 21 Jun 2023 00:00:00 +0000 https://www.hairizuan.com/replicating-golang-interfaces-with-static-python-run-with-mypy/ After coding in both Python and Golang, I now have a very strong preference for strongly typed languages. There is a certain charm and beauty in being able to have the IDE that I’m working in able to provide good autocomplete suggestions for the code - there is less for a need to keep moving files in the codebases just to ensure that the function spelling and params are correct etc. https://www.hairizuan.com/writing-static-python-with-mypy/ Wed, 14 Jun 2023 00:00:00 +0000 https://www.hairizuan.com/writing-static-python-with-mypy/ Python is a dynamically typed language - which provides a huge developer experience as compared to a statically typed language such as Golang. Python does serve as a nice introductory programming language for new developers but as time goes by, it’s pretty easy to see why static programming language is why nicer to work with as compared to dynamically typed language. https://www.hairizuan.com/running-database-migrations-in-helm-chart/ Wed, 07 Jun 2023 00:00:00 +0000 https://www.hairizuan.com/running-database-migrations-in-helm-chart/ In many examples for helm charts, the general focus is on the “2nd” day operations of having applications running without too much issues. In the case for usual web developers, that would mean applications handled with kubernetes deployment objects which would run a set number of replicas (or handled via HPA) in the kubernetes cluster. https://www.hairizuan.com/using-smaller-base-images-for-applications-slim-images-alpine-images-distroless-images/ Wed, 31 May 2023 00:00:00 +0000 https://www.hairizuan.com/using-smaller-base-images-for-applications-slim-images-alpine-images-distroless-images/ When building applications in docker images, there is sometimes a need to consider the size of the containers. There are multiple reasons for us to monitor and check this: In the case where our container registry is actually by us rather than the on public registries. https://www.hairizuan.com/altering-outputs-of-helm-installations-with-post-renderer-via-kustomize/ Wed, 24 May 2023 00:00:00 +0000 https://www.hairizuan.com/altering-outputs-of-helm-installations-with-post-renderer-via-kustomize/ When one thinks of Kubernetes and deploying stuff into Kubernetes, one of the usual ways to get such stuff into Kubernetes is through the use of Kubernetes manifest files. Kubernetes manifest files describe various different resources in Kubernetes cluster - some primary examples that are often used are Deployment, Configmap, Secret, Service and even Ingress Kubernetes resources/objects. https://www.hairizuan.com/updating-configuration-in-kubernetes-pods-managed-via-helm/ Wed, 17 May 2023 00:00:00 +0000 https://www.hairizuan.com/updating-configuration-in-kubernetes-pods-managed-via-helm/ When building an application, a common way to alter and set the running properties of the application is to use configuration files that could be written with JSON or Yaml files. https://www.hairizuan.com/consistent-hashing-implementation-in-golang/ Wed, 10 May 2023 00:00:00 +0000 https://www.hairizuan.com/consistent-hashing-implementation-in-golang/ In the real world, we often have to deal with such large traffic loads that it is almost necessary to know that there is possibility that we might need to get data stored in a cluster of machines. https://www.hairizuan.com/rethinking-migrations-in-golang-applications/ Wed, 03 May 2023 00:00:00 +0000 https://www.hairizuan.com/rethinking-migrations-in-golang-applications/ This is more of a reminder post for me that every aspect of application development is critical and sufficient thought should be put behind it. This time around, it’s on database migration within applications. https://www.hairizuan.com/writing-rego-policies-for-authorization-in-golang-apps/ Wed, 26 Apr 2023 00:00:00 +0000 https://www.hairizuan.com/writing-rego-policies-for-authorization-in-golang-apps/ When building login systems in applications, there are generally two parts to it; authentication and authorization. Authentication is the step to provide and identify who the user that is attempting to use the system. https://www.hairizuan.com/chrome-extension-to-get-rid-of-youtube-shorts/ Wed, 19 Apr 2023 00:00:00 +0000 https://www.hairizuan.com/chrome-extension-to-get-rid-of-youtube-shorts/ I hate Youtube Shorts with a passion. Youtube shorts are a plague in my ways and it seems to be that it’s main purpose is to drag me down to waste hours of my time watching stupid short clips that are usually only mildly amusing. https://www.hairizuan.com/running-kubectl-in-a-kubernetes-pod/ Wed, 12 Apr 2023 00:00:00 +0000 https://www.hairizuan.com/running-kubectl-in-a-kubernetes-pod/ I have a little side project at work where it somewhat requires me to allow a pod within a kubernetes cluster to access and query and manipulate resources in a Kubernetes cluster. https://www.hairizuan.com/serving-videos-with-golang-via-hls/ Wed, 05 Apr 2023 00:00:00 +0000 https://www.hairizuan.com/serving-videos-with-golang-via-hls/ I was watching a bunch of tiktok and youtube videos recently and kind of started to wonder how such companies serve videos to their consumers. That is where I started to going down the rabbit hole of how videos are served and how to try to ensure the possibility that videos can be played without requiring to download the entire video. https://www.hairizuan.com/yaml-linting-and-auto-completion-in-visual-studio-code/ Fri, 31 Mar 2023 00:00:00 +0000 https://www.hairizuan.com/yaml-linting-and-auto-completion-in-visual-studio-code/ When dealing with applications - in terms of configuration work or even deploying the application to production, there is high possibility that we would need to deal with plenty of yaml. https://www.hairizuan.com/trying-cooklang-with-golang-to-document-recipes/ Mon, 20 Mar 2023 00:00:00 +0000 https://www.hairizuan.com/trying-cooklang-with-golang-to-document-recipes/ For many people, cooking is not just a means of sustenance but a beloved hobby and a way to express creativity in the kitchen. However, one of the biggest challenges for home cooks is keeping track of their recipes and possibly the list of interesting recipes from other people. https://www.hairizuan.com/custom-endpoint-for-google-analytics-data-with-golang/ Tue, 28 Feb 2023 00:00:00 +0000 https://www.hairizuan.com/custom-endpoint-for-google-analytics-data-with-golang/ Introduction I used to work with Google Analytics to obtain site analytics for websites and android application. Technically, the current blog is monitored using Google Analytics. Monitoring of website data is generally useful as it provides information to the authors of the website/website owners on what particular content that website visitors find the most useful. https://www.hairizuan.com/creating-a-ssh-tunnel-to-expose-a-web-application-from-a-workstation/ Tue, 31 Jan 2023 00:00:00 +0000 https://www.hairizuan.com/creating-a-ssh-tunnel-to-expose-a-web-application-from-a-workstation/ There are some cases where we would need to host an application on our workstation but need it to be exposed publicly so that people would be able to access the application over the internet. https://www.hairizuan.com/trying-out-google-cloud-workflows/ Mon, 10 Oct 2022 00:00:00 +0000 https://www.hairizuan.com/trying-out-google-cloud-workflows/ Over the recent weekends, I’ve decided to take a gander and try another “serverless” tool called Google Cloud Workflows. The tool’s appeal is to be able coordinate a bunch of services in order to achieve a particular goal. https://www.hairizuan.com/leader-election-in-kubernetes-via-kubernetes-configmaps-and-leases/ Sun, 28 Aug 2022 00:00:00 +0000 https://www.hairizuan.com/leader-election-in-kubernetes-via-kubernetes-configmaps-and-leases/ The leader election mechanism is a somewhat complex thing to kind of code up for an application. There are various Golang libraries that assist with this but it would be nicer if there were mechanisms within the environment that the application operate in which can help with this. https://www.hairizuan.com/continuous-profiling-of-applications-in-kubernetes-via-pyroscope/ Fri, 05 Aug 2022 00:00:00 +0000 https://www.hairizuan.com/continuous-profiling-of-applications-in-kubernetes-via-pyroscope/ The whole process of profiling an application is an attempt to identify hotspots within the application which consumes more resources or takes too much time - knowing this would allow us to identify how to further improve the code within the applications that we build in order to build applications that consume less resources or would respond better to external inputs. https://www.hairizuan.com/fake-redis-server-built-with-golang/ Wed, 20 Jul 2022 00:00:00 +0000 https://www.hairizuan.com/fake-redis-server-built-with-golang/ A friend of mine once mentioned about one of the tasks that he had to go through during his programming days was to build out a server which would respond to the redis-cli tool and I started to think - “that’s something I’ve never done before… I wonder how hard it is? https://www.hairizuan.com/coding-out-self-balancing-tree-data-structures/ Thu, 07 Jul 2022 00:00:00 +0000 https://www.hairizuan.com/coding-out-self-balancing-tree-data-structures/ Over the past month, I decided to go down the rabbit hole of exploring an example of a self balancing tree data structure. I generally don’t need to handle data structures on a day to day basis - I mostly deal with integration of tools as well as deployment of tools into a Kubernetes cluster. https://www.hairizuan.com/custom-js-snippets-in-google-sites/ Mon, 20 Jun 2022 00:00:00 +0000 https://www.hairizuan.com/custom-js-snippets-in-google-sites/ Google sites now allow one to embed Javascript snippets into a site; thereby providing some interesting new capabilities with websites built with Google sites. The post here is a simple example of getting the same functionality provided in the BMI Calculator page. https://www.hairizuan.com/experimenting-with-ip-tables/ Sun, 05 Jun 2022 00:00:00 +0000 https://www.hairizuan.com/experimenting-with-ip-tables/ While playing around with container technologies such as docker and kubernetes, one critical component that kind of comes up over and over again is the whole portion about managing network connections to the containers. https://www.hairizuan.com/restricting-connections-between-pods-in-a-kubernetes-cluster-network-policy/ Sun, 15 May 2022 00:00:00 +0000 https://www.hairizuan.com/restricting-connections-between-pods-in-a-kubernetes-cluster-network-policy/ There is an old adage from security land that we should restrict access to resources/assets as much as we can. Users and applications should only access items that they need to operate themselves. https://www.hairizuan.com/private-vpc-experimentation/ Thu, 05 May 2022 00:00:00 +0000 https://www.hairizuan.com/private-vpc-experimentation/ This blog post is kind of a blog post that provide some notes of some experimentation that I encountered while playing with Google Cloud Platform. The purpose of this experimentation was to do the following: https://www.hairizuan.com/debugging-distroless-kubernetes-pods/ Fri, 15 Apr 2022 00:00:00 +0000 https://www.hairizuan.com/debugging-distroless-kubernetes-pods/ There is a trend of images that follow the philosophy of minimizing the size of image by removing almost everything out of image. This helps with getting image downloaded more quickly by kubelet into the nodes as well as possibly reducing the attack surface of the container even further (I suppose it’s harder to do things in a container if utilities like shell or bash don’t exist within it). https://www.hairizuan.com/a-weight-loss-journey/ Tue, 05 Apr 2022 00:00:00 +0000 https://www.hairizuan.com/a-weight-loss-journey/ Before reading on, I’d just give a disclaimer here that any experience recounted here does not count as medical advice. As with anything to do with health or your body, do seek the appropiate medical channels (your doctor etc). https://www.hairizuan.com/application-performance-isnt-the-most-important-factor-in-application-development/ Sun, 20 Mar 2022 00:00:00 +0000 https://www.hairizuan.com/application-performance-isnt-the-most-important-factor-in-application-development/ NOTE: This post is only my personal view during my course of work across application development and devoloper operations roles across multiple roles and multiple companies and side projects. This might probably sound like random rambling to a software developer that is working in the industry but sometimes, it gets pretty irritating where people throw reasons that certain decisions should be made for “performance” and provide vague reasons for it. https://www.hairizuan.com/devops-interview-questions/ Sun, 27 Feb 2022 00:00:00 +0000 https://www.hairizuan.com/devops-interview-questions/ This is a list of notes for possible interview questions with regards to devops roles. Interview questions for devops are particularly hard to cover since devops roles generally cover a broad range of topics and technologies. https://www.hairizuan.com/kubernetes-ingress-for-applications-with-branded-links-on-gke/ Sun, 13 Feb 2022 00:00:00 +0000 https://www.hairizuan.com/kubernetes-ingress-for-applications-with-branded-links-on-gke/ While dealing with branded links during my course of work, I kind of wondered how it can be tackled if I were to do it in a Google Kubernetes Engine Cluster. https://www.hairizuan.com/bus-arrival-app-singapore/ Thu, 03 Feb 2022 00:00:00 +0000 https://www.hairizuan.com/bus-arrival-app-singapore/ This is a quick sample tool to retrieve bus arrivals in Singapore. In order to use it, we would need to find for the Bus Stop ID or Bus Stop Code from where we’re taking the bus from. https://www.hairizuan.com/database-migration-via-cloud-sql-proxy-for-cloud-sql-in-google-compute-engine-vm/ Mon, 17 Jan 2022 00:00:00 +0000 https://www.hairizuan.com/database-migration-via-cloud-sql-proxy-for-cloud-sql-in-google-compute-engine-vm/ Database migration is kind of a critical bit when it comes to running and operating applications. In Golang, it is kind of appealing to rely on ORM (Object Relational Mapping) libraries. https://www.hairizuan.com/cors-with-golang-microservices-and-elm-frontend-is-difficult/ Sun, 02 Jan 2022 00:00:00 +0000 https://www.hairizuan.com/cors-with-golang-microservices-and-elm-frontend-is-difficult/ I am still building up my personal pet project: https://github.com/hairizuanbinnoorazman/slides-to-video; the aim of this project is a personal one - to build up a set of microservices that is able to be deployed in various ways such as locally via Docker Compose or even to Kubernetes or the serverless Cloud Run platform on Google Cloud Platform. https://www.hairizuan.com/build-chat-app-with-golang-websocket-and-elm-frontend/ Mon, 20 Dec 2021 00:00:00 +0000 https://www.hairizuan.com/build-chat-app-with-golang-websocket-and-elm-frontend/ While building Elm based frontends, I decided to take the opportunity to learn on how to craft a chat application. Truthfully, I’ve never really built one before (nor do I need to). https://www.hairizuan.com/bmi-calculator/ Sun, 05 Dec 2021 00:00:00 +0000 https://www.hairizuan.com/bmi-calculator/ BMI or Body Mass Index is calculated by taking one’s weight (in kilogram) and divided by the square of the height of the person (in metres). You can utilize the following tool below to quickly calculate this. https://www.hairizuan.com/elm-frontend-in-hugo-static-site/ Sat, 27 Nov 2021 00:00:00 +0000 https://www.hairizuan.com/elm-frontend-in-hugo-static-site/ To view the Elm component in action - scroll down to the Elm Component Demonstration section Motivation I wanted to learn to try to write a Frontend Application that provide some sort of dynamic functionality - e. https://www.hairizuan.com/sending-ggplot-graphs-to-googleslides-again/ Sun, 07 Nov 2021 00:00:00 +0000 https://www.hairizuan.com/sending-ggplot-graphs-to-googleslides-again/ There was a change to the Google Slides API that resulted in an inability to upload images from Google Drive into Google Slides programmatically. Refer to the following issue on the rgoogleslides github repo - https://github. https://www.hairizuan.com/rgoogleslides-using-your-own-account-client-id-and-secret/ Sat, 30 Oct 2021 00:00:00 +0000 https://www.hairizuan.com/rgoogleslides-using-your-own-account-client-id-and-secret/ NOTE: BEFORE READING THIS - ALL SCREENSHOTS BELOW ARE TAKEN SOMETIME IN OCTOBER 2021. THE UI MAY CHANGE IN THE FUTURE - USE THIS AS A ROUGH GUIDE AND NOT AS ABSOLUTE TRUTH https://www.hairizuan.com/app-with-metrics-logs-and-distributed-traces/ Wed, 29 Sep 2021 00:00:00 +0000 https://www.hairizuan.com/app-with-metrics-logs-and-distributed-traces/ In a previous post, it details some information of how to setup some open source tooling to capture logs, retrieve metrics as well as capture distributed trace information from apps. The previous blog post would cover the setup of logging system which is Loki, distributed tracing system which is Tempo and metrics collection system which is Prometheus. https://www.hairizuan.com/setting-up-observability-tooling-in-gke/ Wed, 01 Sep 2021 00:00:00 +0000 https://www.hairizuan.com/setting-up-observability-tooling-in-gke/ Generally, most cloud providers come along with all the observability tooling that you need for your apps built-in with the platform. Some of the common observability tools such as logging, monitoring and nowadays, distributed tracing are usually made available and you can easily use said tools by reading up on the various documentation of how to setup each of these tooling. https://www.hairizuan.com/using-envoy-for-grpc-applications-in-kubernetes/ Thu, 15 Jul 2021 00:00:00 +0000 https://www.hairizuan.com/using-envoy-for-grpc-applications-in-kubernetes/ As of now, one of the common and easier way to have services communicate with each other would be over HTTP. In real world use cases, HTTPS is usually used (in order to ensure communications are secure) and this communication is done following some sort of REST framework. https://www.hairizuan.com/notes-for-building-apps-to-be-deployed-on-client-infrastructure/ Wed, 30 Jun 2021 00:00:00 +0000 https://www.hairizuan.com/notes-for-building-apps-to-be-deployed-on-client-infrastructure/ This is definitely not an exhaustive list of items to consider but definitely some of the more obvious features that client side users would look out for and consider when attempting to install such third party apps and operate it on their infrastructure. https://www.hairizuan.com/using-systemd-to-manage-services/ Thu, 10 Jun 2021 00:00:00 +0000 https://www.hairizuan.com/using-systemd-to-manage-services/ What and why systemd? Systemd is a convenient set of tooling that can be used to manage services and applications on a linux server. When we are managing applications on a server, we would want the following properties automatically for most application - the requirements are somewhat for most applications: https://www.hairizuan.com/basic-ssl-setup-server-and-client-ssl-certificate-setup/ Mon, 10 May 2021 00:00:00 +0000 https://www.hairizuan.com/basic-ssl-setup-server-and-client-ssl-certificate-setup/ Install nginx on the instance. We would also probably need to install vim as well to make it changes on nginx configuration. sudo apt update && sudo apt install -y nginx vim sudo su mkdir -p /etc/nginx/ssl cd /etc/nginx/ssl Create the following file in ca. https://www.hairizuan.com/building-nginx-rpm-from-source/ Sat, 01 May 2021 00:00:00 +0000 https://www.hairizuan.com/building-nginx-rpm-from-source/ NOTE: As software advances, some of the commands shown below may become depreciated/irrelevant. If one encounters errors - check the output logs to see what the issue is (e.g. missing library? https://www.hairizuan.com/python-flask-apps-in-kubernetes/ Sun, 18 Apr 2021 00:00:00 +0000 https://www.hairizuan.com/python-flask-apps-in-kubernetes/ This are some notes in the case where one wants to deploy a bunch of python “microservices” to a Google Kubernetes Engine cluster. These notes emphasize on the basics rather than the various nuances of running a “production” grade python application. https://www.hairizuan.com/cloud-run-websocket-support-now-allows-you-to-deploy-a-r-shiny-server-as-a-serverless-app-to-gcp-cloud-run/ Fri, 05 Mar 2021 00:00:00 +0000 https://www.hairizuan.com/cloud-run-websocket-support-now-allows-you-to-deploy-a-r-shiny-server-as-a-serverless-app-to-gcp-cloud-run/ Sometime earlier this year (2021), Google Cloud Run started to support websocket support - which is one of the critical components in order to be able to run a R Shiny Dashboard application. https://www.hairizuan.com/lessons-from-building-slides-to-video-app-part-1/ Sun, 28 Feb 2021 00:00:00 +0000 https://www.hairizuan.com/lessons-from-building-slides-to-video-app-part-1/ A long time back, sometime in 2019 (which is almost an eternity ago ), I kind of did up an application that can take some slides saved in a pdf file and generate a video out of it. https://www.hairizuan.com/charting-a-career-path-in-the-tech-world/ Tue, 05 Jan 2021 00:00:00 +0000 https://www.hairizuan.com/charting-a-career-path-in-the-tech-world/ DISCLAIMER: The following article is just an opinion. Naturally, each person have their own work experiences that they can use to project their future plans; so take the items in this article with a large spoonful of salt when applying it into your own perspective. https://www.hairizuan.com/automating-the-admin-work-when-organizing-webinars-in-a-meetup-group/ Thu, 01 Oct 2020 00:00:00 +0000 https://www.hairizuan.com/automating-the-admin-work-when-organizing-webinars-in-a-meetup-group/ There is actually plenty of work that needs to be done in order to continuously and consistently organize webinars in a meetup group. I am involved in one of them and it takes quite a bit of effort to maintain such effort to ensure that the group look “alive” with webinars being continuously churned out during this unique situation. https://www.hairizuan.com/tripping-over-helm-hooks/ Fri, 11 Sep 2020 00:00:00 +0000 https://www.hairizuan.com/tripping-over-helm-hooks/ One typical way to do packaging for applications that are to targeted to be deployed into a Kubernetes environment would be to utilize the helm tool. The helm tool has been used widely enough to the point that there are whole ecosystems that support the usage of this tool. https://www.hairizuan.com/implications-for-having-switchable-loggers/ Sun, 16 Aug 2020 00:00:00 +0000 https://www.hairizuan.com/implications-for-having-switchable-loggers/ Loggers in codebases are generally code that is just taken for granted. We would usually imagine that we’ll just choose a logger library, import it and then just utilize in code. https://www.hairizuan.com/attempting-to-understand-csi-kubernetes/ Fri, 01 May 2020 00:00:00 +0000 https://www.hairizuan.com/attempting-to-understand-csi-kubernetes/ NOTE: THIS POST IS NOTES IM TAKING FOR MYSELF WHILE ON THIS JOURNEY. TAKE IT WITH A BAG OF SALT. NOT ALL THINGS MENTIONED HERE IS TRUE - DO YOUR OWN DUE DILIGENCE https://www.hairizuan.com/recording-demos-with-free-tooling/ Wed, 15 Apr 2020 00:00:00 +0000 https://www.hairizuan.com/recording-demos-with-free-tooling/ There are various tooling out there that helps deal with screen recording etc. However, many of these tools/sites would somehow provide the recordings at a price. Maybe you can only record a certain number of hours of video per month? https://www.hairizuan.com/dockerizing-application-that-use-unix-sockets/ Sun, 12 Apr 2020 00:00:00 +0000 https://www.hairizuan.com/dockerizing-application-that-use-unix-sockets/ While trying to understand how components that deal with Container Storage Interface (CSI) in Kubernetes, I came across mentions of how the components were using Unix domain sockets to communicate with each other. https://www.hairizuan.com/trying-distributed-tracing-with-jaeger/ Sat, 04 Apr 2020 00:00:00 +0000 https://www.hairizuan.com/trying-distributed-tracing-with-jaeger/ Let’s say we have a set of applications that was designed to be a set of microservices. Each of the applications would generally be designed to be focused on one specific domain and in order to achieve the overall goal of the platform. https://www.hairizuan.com/trying-knative-from-scratch/ Mon, 09 Mar 2020 00:00:00 +0000 https://www.hairizuan.com/trying-knative-from-scratch/ This blog post is still being updated Various cloud providers started offering serverless containers as a service. This is a service where developers can just create a container and then, pass that container over to the cloud provider and then forget about it. https://www.hairizuan.com/golang-composition/ Fri, 10 Jan 2020 00:00:00 +0000 https://www.hairizuan.com/golang-composition/ These are some notes I took while experimenting and playing around with Golang further. This article is mainly exploring embedded structs and interfaces to experiment how they work etc. Use Golang playground in order to see how it works in action https://www.hairizuan.com/tips-for-class-3-license-in-singapore/ Fri, 20 Dec 2019 00:00:00 +0000 https://www.hairizuan.com/tips-for-class-3-license-in-singapore/ These are some notes that I took while taking my driving license - Class 3 in Singapore at CDC from August 2019 to December 2019. Some of the advice may/may not apply to you when learning to drive - so take all advice with a grain of salt. https://www.hairizuan.com/microsoft-graph-api-authentication/ Fri, 18 Oct 2019 00:00:00 +0000 https://www.hairizuan.com/microsoft-graph-api-authentication/ I’ve recently needed to find a way to use the Graph APIs offered by Microsoft in order to receive data and send data to the various Microsoft services. However, the documentation for it is pretty much scattered with various “depreciated” versions of the documentation everywhere. https://www.hairizuan.com/cookiecutter-template-for-google-cloud-run/ Sat, 05 Oct 2019 00:00:00 +0000 https://www.hairizuan.com/cookiecutter-template-for-google-cloud-run/ While working on a couple of projects that would be deployed on Google Cloud Run, I realized that a couple of them tend to have some sort of similar structure. Due to the number of repositories I would typically handle on a personal basis as well as the amount of context switch I would need to move between projects; it would ideal that all of such projects are automated as much as possible. https://www.hairizuan.com/ssh-configurations-for-going-into-google-cloud-instances/ Thu, 01 Aug 2019 00:00:00 +0000 https://www.hairizuan.com/ssh-configurations-for-going-into-google-cloud-instances/ A classic move to reduce the attack surface of Google Cloud Instances is follow the advice below: If service on instance don’t need Public IPs, don’t attach Public IPs to such instances If instance requires Public IPs, ensure that only specific ports that are required are exposed. https://www.hairizuan.com/introduction-to-google-cloud-run/ Mon, 15 Apr 2019 00:00:00 +0000 https://www.hairizuan.com/introduction-to-google-cloud-run/ There are various serverless compute solutions on the Google Cloud Platfrom; initially it used to be only Appengine and Google Cloud Function. Google Appengine is a solution that allow you to focus on writing up apps and allow Google to take of deployment/scaling/operations. https://www.hairizuan.com/private-go-modules-in-google-cloud-build/ Fri, 01 Mar 2019 00:00:00 +0000 https://www.hairizuan.com/private-go-modules-in-google-cloud-build/ So recently, I’ve been needing to automate my builds for my few Golang projects via Google Cloud Build. However, rather than building docker containers, I needed Golang binaries instead, which kind of meant that I would need to have the CI/CD pipeline have a Go environment/runtime to build them. https://www.hairizuan.com/setting-up-a-private-pypi-server/ Fri, 01 Feb 2019 00:00:00 +0000 https://www.hairizuan.com/setting-up-a-private-pypi-server/ As one writes several python applications to be targeted on the Google Cloud Functions platform, it becomes increasingly obvious to pull out the more common bits of code out into its own library. https://www.hairizuan.com/preparing-for-google-cloud-developer-certification/ Sat, 26 Jan 2019 00:00:00 +0000 https://www.hairizuan.com/preparing-for-google-cloud-developer-certification/ Recently, Google has been launching a couple of certification programs that would help people dictate their knowledge and expertise levels with the Google Cloud Platform. At the moment (January 2019), there are 7 certifications including Professional Cloud Architect, Cloud Developer and Professional Data Engineer. https://www.hairizuan.com/devops-tools-with-google-cloud-platform/ Mon, 14 Jan 2019 00:00:00 +0000 https://www.hairizuan.com/devops-tools-with-google-cloud-platform/ There are various tooling out there to make deployment of applications easier. Some tools are used in order to help developers and organizations attempt to reach the “12 factor app” standard of applications which are set of applications that are explicitly designed to be able to scale where needed. https://www.hairizuan.com/things-to-watch-out-for-in-2019/ Thu, 10 Jan 2019 00:00:00 +0000 https://www.hairizuan.com/things-to-watch-out-for-in-2019/ The list would be updated as time goes by in the year A list of conferences and meetups and exhibitions to look for especially in 2019: This kind of personal list that I’m keeping track; it mainly revolves around Golang, modern architecture technologies e. https://www.hairizuan.com/triggering-analytics-via-serverless-functions-part-2/ Sat, 10 Nov 2018 00:00:00 +0000 https://www.hairizuan.com/triggering-analytics-via-serverless-functions-part-2/ This is a continuation of previous blog post. To summarize the previous related blog post. Too painful to have people respond and react to report generation and compilation Too expensive to have machine lying around to pick up the slack and automate the reports; serverless solutions (pay on use) could be a useful model to use when running automated reports. https://www.hairizuan.com/triggering-analytics-via-serverless-functions-part-1/ Tue, 06 Nov 2018 00:00:00 +0000 https://www.hairizuan.com/triggering-analytics-via-serverless-functions-part-1/ Seeing how functions change the way one looks at compute workloads in terms of products makes me wonder how one/companies can look at their analytics workloads and try to see if it was possible to change the costing model in that direction. https://www.hairizuan.com/best-practices-for-python-scripting-building-reliable-data-science-workflows/ Mon, 15 Oct 2018 00:00:00 +0000 https://www.hairizuan.com/best-practices-for-python-scripting-building-reliable-data-science-workflows/ Data engineering work usually serves to be fundamentally one of the important bits when it comes to report generation in the business. The act of connecting of understanding the data that goes through the business and the need to maintain all the scripts that handle the pulling and merging all of such data makes the job way harder than one can expect. https://www.hairizuan.com/using-nginx-to-serve-as-ingress-to-multiple-servers/ Sat, 29 Sep 2018 00:00:00 +0000 https://www.hairizuan.com/using-nginx-to-serve-as-ingress-to-multiple-servers/ This is a little experiment to see how this would work; in the case where we have multiple Go binaries with multiple web applications. If we wanted to expose this via a single http endpoint rather than providing a whole multitude of web endpoints. https://www.hairizuan.com/git-cheatsheet/ Wed, 12 Sep 2018 00:00:00 +0000 https://www.hairizuan.com/git-cheatsheet/ Git is one of the most important tools in a software developer arsenal. It is one of the main tool developers use in order to handle and control their code versioning. https://www.hairizuan.com/attempting-to-setup-kubernetes-on-ubuntu-vms/ Wed, 05 Sep 2018 00:00:00 +0000 https://www.hairizuan.com/attempting-to-setup-kubernetes-on-ubuntu-vms/ This post details my naive attempt to bring up a Kubernetes cluster on a VM. These steps to try out Kubernetes in a bare Google Virtual Machine (but the following steps should work for most Debian/Ubuntu virtual machines). https://www.hairizuan.com/getting-meetup-stats-with-google-cloud-functions/ Fri, 24 Aug 2018 00:00:00 +0000 https://www.hairizuan.com/getting-meetup-stats-with-google-cloud-functions/ Meetup.com is a pretty nice site to setup meetups and sharings on technologies. The platform is pretty nice and easy to use when it comes to bookings but sometimes, the data provided by its web interface is not sufficient nor does it fit our use case. https://www.hairizuan.com/trying-out-skaffold/ Thu, 09 Aug 2018 00:00:00 +0000 https://www.hairizuan.com/trying-out-skaffold/ When developing application that are meant to be deployed to the Kubernetes platform, it involves a bunch of steps on top of your usual local development work: Writing a Dockerfile to package the application (Multi stage applications are optional here - useful for compiled based languages) Build and tagging the docker image of the application with the target repository Either use kubectl commands or use kubernetes config resource files to define the resources required for deploying the applications. https://www.hairizuan.com/rendering-diagrams-in-hugo/ Thu, 02 Aug 2018 00:00:00 +0000 https://www.hairizuan.com/rendering-diagrams-in-hugo/ There is an interesting Javascript project that allows one to use just plain old text and convert those said text into diagrams. mermaid.initialize({ startOnLoad: true }); graph TD Start -- Stop Text to that converts to the above diagram: https://www.hairizuan.com/summary-of-google-cloud-next-2018/ Sun, 29 Jul 2018 00:00:00 +0000 https://www.hairizuan.com/summary-of-google-cloud-next-2018/ Google recently had a Google Cloud conference where they feature all the exciting new technologies that are made available in Google Cloud. There are numerous product announcements that were mentioned in the various keynotes as well as the breakout sessions; so in an attempt to understand what’s exactly is happening in terms of major product releases, I did a textual overview of the videos with links to additional resources. https://www.hairizuan.com/summaries-from-google-io-extended-2018-singapore-day-2/ Mon, 16 Jul 2018 00:00:00 +0000 https://www.hairizuan.com/summaries-from-google-io-extended-2018-singapore-day-2/ This is not a in depth summary of the talks in Google IO Extended 2018. Rather, it is my notes from attending to the conference, which are heavier on links to find more about the topics. https://www.hairizuan.com/summaries-from-google-io-extended-2018-singapore-day-1/ Wed, 11 Jul 2018 00:00:00 +0000 https://www.hairizuan.com/summaries-from-google-io-extended-2018-singapore-day-1/ This is not a in depth summary of the talks in Google IO Extended 2018. Rather, it is my notes from attending to the conference, which are heavier on links to find more about the topics. https://www.hairizuan.com/lessons-from-kubecon/cloudnativecon-2018-europe/ Wed, 16 May 2018 00:00:00 +0000 https://www.hairizuan.com/lessons-from-kubecon/cloudnativecon-2018-europe/ The following set of summaries are from the Kubecon and Cloud Native Con Europe in Denmark from 2-4 May 2018. These summaries are from conference talks that I thought provided more interesting thinking points. https://www.hairizuan.com/lessons-from-gophercon-sg/ Wed, 09 May 2018 00:00:00 +0000 https://www.hairizuan.com/lessons-from-gophercon-sg/ This is the list of talks provided in the reccent Gophercon Conference held in Singapore on 4th May 2018 Go with Versions Project-driven journey to learning Go Resilency in Distributed Systems Understanding Running Go Program Go for Grab Optimize for Correctness Build your own distributed database The Scandalous Sotry of Dreadful Code Written by the Best of Us Erlang for Go developers Go and the future of offices Reflections on Trusting Trust for Go The lost art of bondage Below are some of the more interesting points raised during the talk (View the full talk to understand the context on what and why a certain point was raised. https://www.hairizuan.com/summaries-from-fossasia-conference-in-singapore/ Wed, 02 May 2018 00:00:00 +0000 https://www.hairizuan.com/summaries-from-fossasia-conference-in-singapore/ View the full list of Fossasia Video recordings on the [engineers.sg] website on this website: https://engineers.sg/conference/fossasia-2018 Here are some of the videos I particularly liked. I summarized some of the interesting points from said websites. https://www.hairizuan.com/lets-use-cli-to-create-tasks/ Sun, 22 Apr 2018 00:00:00 +0000 https://www.hairizuan.com/lets-use-cli-to-create-tasks/ Out of random curiousity and laziness on my part, I decided to create a CLI tool which would allow me to create tasks on task managements websites such as on Asana, and issues in Github/Bitbucket. https://www.hairizuan.com/using-google-tag-manager-in-react-web-application/ Sun, 15 Apr 2018 00:00:00 +0000 https://www.hairizuan.com/using-google-tag-manager-in-react-web-application/ This is going to be a pretty short post but should prove to be useful if you are already familiar with tool. Quick intro of normal website tracking When one navigates through a normal server rendered website that is utilizing Google Tag Manager or Google Analytics (assuming that is is set up right), as the page loads, it would send a page view hit to the Google Analytics server. https://www.hairizuan.com/a-sample-bookcase-application-case-via-gin-golang-framework/ Thu, 08 Mar 2018 00:00:00 +0000 https://www.hairizuan.com/a-sample-bookcase-application-case-via-gin-golang-framework/ This is an application based on a previous blog post on Bookcase application. The link to the code base of the application: https://github.com/hairizuanbinnoorazman/golang-web-gin-book-store There is a chance that when you are on the code base, the application is not fully operational; I am still adding code to it to add functionality to the application https://www.hairizuan.com/a-sample-bookcase-application-case/ Wed, 07 Mar 2018 00:00:00 +0000 https://www.hairizuan.com/a-sample-bookcase-application-case/ We would try to implement the various technology stack for some common web application scenario in several types of libraries. In our case here, we would attempt to implement it for the following scenario. https://www.hairizuan.com/favourite-golang-resources/ Wed, 28 Feb 2018 00:00:00 +0000 https://www.hairizuan.com/favourite-golang-resources/ This is a personal list of Golang Resources I like to keep track. This is a evergreen list so I will update it once in a while when new stuff pops up. https://www.hairizuan.com/refactoring-go-safely/ Wed, 21 Feb 2018 00:00:00 +0000 https://www.hairizuan.com/refactoring-go-safely/ An excellent resource to read on Refactoring Golang code safely and to ensure that Golang code continue does not result in breaking changes in the codebase. https://talks.golang.org/2016/refactor.article An important to take away from the article is the fact that when making API changes to a code base, the portion that results in largest amount of work is the amount of code repair that needs to be done. https://www.hairizuan.com/things-to-watch-out-for-in-2018/ Wed, 14 Feb 2018 00:00:00 +0000 https://www.hairizuan.com/things-to-watch-out-for-in-2018/ A list of conferences and meetups and exhibitions to look for especially in 2018: This kind of personal list that I’m keeping track; it mainly revolves around Golang, modern architecture technologies e. https://www.hairizuan.com/opinion-piece-moving-to-hugo/ Wed, 31 Jan 2018 00:00:00 +0000 https://www.hairizuan.com/opinion-piece-moving-to-hugo/ After a long while being on some managed platform for writing blog posts, I decided to move out of that into one which would require myself to manage things on my own. https://www.hairizuan.com/using-go-in-aws-lambda/ Mon, 15 Jan 2018 00:00:00 +0000 https://www.hairizuan.com/using-go-in-aws-lambda/ Disclaimer: There are definitely better ways of doing this; this is more of a lazy man’s way of doing it. This is just to explore the possibility of getting a golang application into AWS Lambda and successfully running it. https://www.hairizuan.com/interesting-points-from-kubecon/native-con-2017/ Mon, 08 Jan 2018 00:00:00 +0000 https://www.hairizuan.com/interesting-points-from-kubecon/native-con-2017/ Full Playlist can be found here: https://www.youtube.com/watch?v=Z3aBWkNXnhw&list=PLj6h78yzYM2P-3-xqvmWaZbbI1sW-ulZb Cloud Native Landscape: https://github.com/cncf/landscape Keynote: Can 100 Million Developers Use Kubernetes? Kubernetes: This Job is Too Hard: Building New Tools, Patterns and Paradigms to Democratize Weaving the Service Mesh Microservices, Service Mesh, and CI/CD Pipelines: Making It All Work Together Developing Locally with Kubernetes State of Serverless Keynote: What’s Next? https://www.hairizuan.com/using-aws-lambda-for-data-science-projects-and-automations-2/ Tue, 02 Jan 2018 00:00:00 +0000 https://www.hairizuan.com/using-aws-lambda-for-data-science-projects-and-automations-2/ Following from the previous blog post: Using AWS Lambda for Data Science Projects and Automations - Part 1 Let’s deploy a serverless application! Problem Statement: The application we would be trying out this time will do the following: https://www.hairizuan.com/using-aws-lambda-for-data-science-projects-and-automations-1/ Wed, 20 Dec 2017 00:00:00 +0000 https://www.hairizuan.com/using-aws-lambda-for-data-science-projects-and-automations-1/ A thought experiment Let’s say there was this one day during your usual work hours where you are tasked to handle some data transformations between your data sources. The data source is csv file generated from backend systems and is provided on the hourly basis. https://www.hairizuan.com/using-decorator-pattern-to-remove-code-bloat/ Thu, 26 Oct 2017 00:00:00 +0000 https://www.hairizuan.com/using-decorator-pattern-to-remove-code-bloat/ I’ve been learning plenty of Golang nowadays and one of the most common design patterns that I keep hearing about is the decorator pattern. It is often used when handling with web requests; where you would create a function that accepts a struct that implements the handler interface which would then return an struct that also implements the handler interface. https://www.hairizuan.com/using-go-to-post-messages-on-slack/ Sun, 22 Oct 2017 00:00:00 +0000 https://www.hairizuan.com/using-go-to-post-messages-on-slack/ A sample application to kind of get started with Go. This application involves pinging a channel on Slack via a webhook. Slack provides a unique URL in order to ping Slack with messages from a script/application. https://www.hairizuan.com/using-docker-multi-stage-builds-to-run-unit-tests/ Tue, 17 Oct 2017 00:00:00 +0000 https://www.hairizuan.com/using-docker-multi-stage-builds-to-run-unit-tests/ This is a suggestion piece and not a recommended way of using docker or anything. Motivation The question we would want to know here is how do we exactly run the full on/all the unit tests for our applications built via Docker. https://www.hairizuan.com/screen-recording-on-the-server/ Sun, 27 Aug 2017 00:00:00 +0000 https://www.hairizuan.com/screen-recording-on-the-server/ Over the weekend, I’ve been experimenting whether if its possible to set up screen recording on a linux server. This is partly just out of curiosity but also, a little a bit of frustration. https://www.hairizuan.com/matching-object-ids-in-elements-on-a-googleslide/ Mon, 19 Jun 2017 00:00:00 +0000 https://www.hairizuan.com/matching-object-ids-in-elements-on-a-googleslide/ While attempting to play around with object ids via the rgoogleslides package, the main issue I got was to quickly understand which object id referred to which element on the slide? https://www.hairizuan.com/rgoogleslides-updated-to-v0.2.0-alpha/ Thu, 11 May 2017 00:00:00 +0000 https://www.hairizuan.com/rgoogleslides-updated-to-v0.2.0-alpha/ The rgoogleslides package is being upgraded with a quite a big change in methodogy. Refer to the following release notes for more detailed information. https://github.com/hairizuanbinnoorazman/rgoogleslides/releases/tag/v0.2.0-alpha The previous design package suffer from several design flaws, some of which would be detailed below: https://www.hairizuan.com/sending-ggplot-graphs-to-googleslides/ Thu, 11 May 2017 00:00:00 +0000 https://www.hairizuan.com/sending-ggplot-graphs-to-googleslides/ IMPORTANT: THE FOLLOWING BLOG POST IS OUTDATED. THERE IS AN UPDATE TO GOOGLESLIDES API WHICH DISABLE USAGE OF GOOGLE DRIVE IMAGES. NOW ALL IMAGES HAS TO BE FROM PUBLIC SOURCES. THERE IS A FEATURE REQUEST TICKET CREATED TO ADD THIS FUNCTIONALITY BACK BUT THERE IS A HIGH LIKELIHOOD IT WONT BE BACK FOR A LONG TIME https://www.hairizuan.com/restructuring-rgoogleslides/ Wed, 10 May 2017 00:00:00 +0000 https://www.hairizuan.com/restructuring-rgoogleslides/ In the initial draft of the rgoogleslides package, there were several wrapper functions that serve to immediately call the Google Slides API immediately after it is being used. Some of the examples are below: https://www.hairizuan.com/using-service-accounts-with-rga/ Tue, 21 Mar 2017 00:00:00 +0000 https://www.hairizuan.com/using-service-accounts-with-rga/ RGA is one of the packages I often use in my line of work and I use it to extract data from Google Analytics Platform into R. From there, I can easily utilize data manipulation packages such as dplyr and tidyr to get the results I would need before pushing those results back to Googlesheets via the googlesheets R package. https://www.hairizuan.com/tips-on-microservices/ Fri, 10 Feb 2017 00:00:00 +0000 https://www.hairizuan.com/tips-on-microservices/ Setting up microservices is really quite hard. Its not just about the technology but it involves culture and habits that the team have in order to have the discipline and also the ease in order to create services that would scale well. https://www.hairizuan.com/r-is-an-object-oriented-language/ Mon, 09 Jan 2017 00:00:00 +0000 https://www.hairizuan.com/r-is-an-object-oriented-language/ Although it is often mentioned in many of the online tutorials and wikis that R is a Object Oriented language, the code examples on the web definitely don’t show too many hints of that. https://www.hairizuan.com/googleslides-r-package-in-the-making/ Tue, 03 Jan 2017 00:00:00 +0000 https://www.hairizuan.com/googleslides-r-package-in-the-making/ Some time late last year, the Googleslides API was announced by Google. This was a pretty exciting piece of news; one that took so long to come. Slides API Announced By Google https://www.hairizuan.com/data-science-maturity-in-an-organization/ Thu, 01 Dec 2016 00:00:00 +0000 https://www.hairizuan.com/data-science-maturity-in-an-organization/ Domino released a pretty comprehensive paper on data science maturity models in organizations. Link to the paper: https://www.dominodatalab.com/p/data-science-maturity-model-ungated Data Science is not something that a company can just immediately buy from the market (hiring and tooling); its much more than that. https://www.hairizuan.com/slides-api-announced-by-google/ Sat, 19 Nov 2016 00:00:00 +0000 https://www.hairizuan.com/slides-api-announced-by-google/ Earlier this year, Google announced a couple of new APIs for the set of Google Products in its productivity and office suite, namely the Google Slides API https://gsuiteupdates.googleblog.com/2016/05/new-ways-to-keep-data-flowing-between.html It has been a long time but ever since the announcement in the Google IO earlier this year, I’ve been anticipating for the arrival of the API and it’s already here! https://www.hairizuan.com/newposts/apps/30180101_testingdockercompose/ Mon, 01 Jan 0001 00:00:00 +0000 https://www.hairizuan.com/newposts/apps/30180101_testingdockercompose/ Debian installation of docker sudo apt update sudo apt-get -y install \ apt-transport-https \ ca-certificates \ curl \ gnupg2 \ software-properties-common curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add - sudo apt-key fingerprint 0EBFCD88 sudo add-apt-repository \ "deb [arch=amd64] https://download. https://www.hairizuan.com/newposts/podcast/ Mon, 01 Jan 0001 00:00:00 +0000 https://www.hairizuan.com/newposts/podcast/ https://dev.to/sedaily https://www.hairizuan.com/newposts/random_taskwarrior/ Mon, 01 Jan 0001 00:00:00 +0000 https://www.hairizuan.com/newposts/random_taskwarrior/ https://taskwarrior.org/ https://blog.djy.io/taskwarrior-where-have-you-been-all-my-life/