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Add docs for cgroup-parent of systemd cgroup 

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
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Qiang Huang 2016-03-01 05:24:27 -05:00 committed by Tibor Vass
parent 6ee9d8a187
commit 119605fc24
1 changed files with 8 additions and 0 deletions
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docs/reference/commandline/daemon.md
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@ -804,6 +804,14 @@ Assuming the daemon is running in cgroup `daemoncgroup`,
`/sys/fs/cgroup/memory/foobar`, whereas using `--cgroup-parent=foobar` `/sys/fs/cgroup/memory/foobar`, whereas using `--cgroup-parent=foobar`
creates the cgroup in `/sys/fs/cgroup/memory/daemoncgroup/foobar` creates the cgroup in `/sys/fs/cgroup/memory/daemoncgroup/foobar`
The systemd cgroup driver has different rules for `--cgroup-parent`. Systemd
represents hierarchy by slice and the name of the slice encodes the location in
the tree. So `--cgroup-parent` for systemd cgroups should be a slice name. A
name can consist of a dash-separated series of names, which describes the path
to the slice from the root slice. For example, `--cgroup-parent=user-a-b.slice`
means the memory cgroup for the container is created in
`/sys/fs/cgroup/memory/user.slice/user-a.slice/user-a-b.slice/docker-<id>.scope`.
This setting can also be set per container, using the `--cgroup-parent` This setting can also be set per container, using the `--cgroup-parent`
option on `docker create` and `docker run`, and takes precedence over option on `docker create` and `docker run`, and takes precedence over
the `--cgroup-parent` option on the daemon. the `--cgroup-parent` option on the daemon.