diff options
| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2017-12-23 10:58:08 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2017-12-23 10:58:08 +0100 |
| commit | 57cbb0dbb0d91dc5eb085b2b74243e99bc766f85 (patch) | |
| tree | ae728bb4f49d807e53c1cd5010878fba025ab551 /man7/cgroups.7 | |
| parent | 75a12bb537042df0379d841ae94c93667cf919c4 (diff) | |
| download | man-pages-57cbb0dbb0d91dc5eb085b2b74243e99bc766f85.tar.gz | |
cgroups.7: One may need to unmount v1 controllers before they can be used in v2
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/cgroups.7')
| -rw-r--r-- | man7/cgroups.7 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/man7/cgroups.7 b/man7/cgroups.7 index 57e08b96c1..6bd44942bd 100644 --- a/man7/cgroups.7 +++ b/man7/cgroups.7 @@ -554,6 +554,24 @@ A cgroup v2 controller is available only if it is not currently in use via a mount against a cgroup v1 hierarchy. Or, to put things another way, it is not possible to employ the same controller against both a v1 hierarchy and the unified v2 hierarchy. +This means that it may be necessary first to unmount a v1 controller +(as described above) before that controller is available in v2. +Since +.BR systemd (1) +makes heavy use of some v1 controllers by default, +it can in some cases be simpler to boot the system with +selected v1 controllers disabled. +To do this, specify the +.IR cgroup_no_v1=list +option on the kernel boot command line; +.I list +is a comma-separated list of the names of the controllers to disable, +or the word +.I all +to disable all v1 controllers. +(This situation is correctly handled by +.BR systemd (1), +which falls back to operating without the specified controllers.) .PP Note that on many modern systems, .BR systemd (1) |