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Persistent ext4 Roots for Multikernel Linux on Google Compute Engine

··1340 words·7 mins
Cloud Linux Google-Cloud Compute-Engine Multikernel Ext4
My first Multikernel Linux experiment on Google Compute Engine (GCE) showed that one VM could run a primary kernel and multiple child kernels at the same time. The children could use different kernel binaries, but their root filesystems were either minimal initramfs images or DAXFS. That left an important question unanswered: could a child kernel have a persistent, read-write ext4 root filesystem?

Can Multikernel Linux Run on Google Compute Engine?

··1336 words·7 mins
Cloud Linux Google-Cloud Compute-Engine Multikernel
The idea behind Multikernel Linux is unusual: one physical machine can run several independent Linux kernels at the same time, without placing a conventional hypervisor between those kernels and the hardware. A primary kernel owns the machine’s resources, moves selected CPUs, memory, and devices into a pool, and starts child kernels from that pool.