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| author |  sommerfeld <sommerfeld@sommerfeld.dev> | 2026-05-19 15:16:09 +0100 |
|---|---|---|
| committer | sommerfeld <sommerfeld@sommerfeld.dev> | 2026-05-19 15:16:09 +0100 |
| commit | 31a92930f7ef231069ebaf42ec2d0255abc22c25 (patch) | |
| tree | 8963a345f1136e30fe1bf9069b8b78e0c192361c | |
| parent | d25a79ea717d29ceb8ecc1c97c0bc4ec8cbaf4d3 (diff) | |
| download | dotfiles-31a92930f7ef231069ebaf42ec2d0255abc22c25.tar.gz dotfiles-31a92930f7ef231069ebaf42ec2d0255abc22c25.tar.bz2 dotfiles-31a92930f7ef231069ebaf42ec2d0255abc22c25.zip | |
docs(remote-dev): mark cgroups v2 switch as optional
Affects the whole host and requires a reboot — only worth doing if you
need rootless --memory/--cpus limits. Rootless podman otherwise runs
fine on cgroups v1.
| -rw-r--r-- | remote-dev/README.md | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/remote-dev/README.md b/remote-dev/README.md index a17c913..172be80 100644 --- a/remote-dev/README.md +++ b/remote-dev/README.md @@ -168,21 +168,22 @@ grep "^$USER:" /etc/subuid /etc/subgid || \ sudo usermod --add-subuids 100000-165535 --add-subgids 100000-165535 "$USER" ``` -Then enable cgroups v2 (required for rootless CPU/memory limits on -Ubuntu 20.04, which still defaults to v1): +Then (optional, **only** if you need rootless CPU/memory limits) enable +cgroups v2. Ubuntu 20.04 still defaults to v1; flipping this requires a +reboot and affects every workload on the box, so skip unless you have a +concrete need: ```sh sudo sed -i 's|^GRUB_CMDLINE_LINUX_DEFAULT="\(.*\)"|GRUB_CMDLINE_LINUX_DEFAULT="\1 systemd.unified_cgroup_hierarchy=1"|' /etc/default/grub -sudo update-grub -sudo reboot +sudo update-grub && sudo reboot ``` -Verify after reboot: +Verify: ```sh -stat -fc %T /sys/fs/cgroup/ # → cgroup2fs podman info | grep -E 'cgroupVersion|graphDriverName|networkBackend' -# expected: cgroupVersion: v2, graphDriverName: overlay, networkBackend: netavark +# expected: graphDriverName: overlay, networkBackend: netavark +# cgroupVersion: v1 is fine — only blocks --memory/--cpus flags. podman run --rm docker.io/library/alpine echo hi ``` |