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Good article. Firecracker is something that has definitely piqued my interest when it comes to quickly spinning up a throwaway environment to use for either development or CI. I run a CI platform [1], which currently uses QEMU for the build environments (Docker is also supported but currently disabled on the hosted offering), startup times are ok, but having a boot time of 1-2s is definitely highly appealing. I will have to investigate Firecracker further to see if I could incorporate this into what I'm doing.
Julia Evans has also written about Firecracker in the past too [2][3].
[1] - https://about.djinn-ci.com
[2] - https://jvns.ca/blog/2021/01/23/firecracker--start-a-vm-in-l...
[3] - https://news.ycombinator.com/item?id=25883253
You can checkpoint and restore, but only once for security reasons, so it doesn't help much.
https://github.com/firecracker-microvm/firecracker/blob/main...
The VMs launch super quick in < 1s they are actually running a job.
