Commit Graph

2 Commits (77fa7fb4908380757a58d7ab890d33e62b4c1cf1)

Author SHA1 Message Date
Akihiro Suda daf527ccaf k3s-rootless.service: use fuse-overlayfs snapshotter
Kernel 5.11 added support for rootless overlayfs, but still incompatible
with SELinux, so we should always use fuse-overlayfs.

Related: moby/moby issue 42333

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
2021-06-01 13:13:21 -07:00
Akihiro Suda 6e8284e3d4 rootless: enable resource limitation (requires cgroup v2, systemd)
Now rootless mode can be used with cgroup v2 resource limitations.
A pod is executed in a cgroup like "/user.slice/user-1001.slice/user@1001.service/k3s-rootless.service/kubepods/podd0eb6921-c81a-4214-b36c-d3b9bb212fac/63b5a253a1fd4627da16bfce9bec58d72144cf30fe833e0ca9a6d60ebf837475".

This is accomplished by running `kubelet` in a cgroup namespace, and enabling `cgroupfs` driver for the cgroup hierarchy delegated by systemd.

To enable cgroup v2 resource limitation, `k3s server --rootless` needs to be launched as `systemctl --user` service.
Please see the comment lines in `k3s-rootless.service` for the usage.

Running `k3s server --rootless` via a terminal is not supported.
When it really needs to be launched via a terminal, `systemd-run --user -p Delegate --tty` needs to be prepended to create a systemd scope.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
2021-03-24 00:37:30 -07:00