[nnx]

Thank you for your work on OrbStack. Just tried it after reading about in this thread and it looks really great so far, both as Docker replacement and absolutely delightful to launch full Linux VMs.

Noticed you are using a very recent kernel, Linux ubuntu 6.3.12-orbstack, which is so great to test latest revisions of Linux system calls (eg. io_uring) locally, compared to Docker old 5.x kernels which I gave up figuring out how to upgrade.

Any way to select a specific kernel version for VM or container? That would be a killer feature for regression testing.

[kdrag0n]

Glad to hear that!

There's currently no support for changing the kernel version. I think it may not be feasible to support many versions because a lot of OrbStack's improvements are very closely tied to the kernel, and maintaining the patches for multiple versions wouldn't be worth the work. Outside of regression testing, it's rare that anything breaks and in the event that such changes occur upstream, I try to hold off on updating until they're fixed.

Are you mainly interested in 5.15/6.1 LTS or other specific versions? Having an alternate LTS kernel (for a total of two options) might be a possibility in the (long term) future.

[nnx]

Having the option of an "older" LTS kernel (say 5.15 or 5.10) would be useful so as to match the kernel used in a lot of commonly used cloud images (including Ubuntu 22.04 LTS and Amazon Linux 2).