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cgroup2: use "systemd" cgroup driver by default when available

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The "systemd" cgroup driver is always preferred over "cgroupfs" on
systemd-based hosts.

This commit does not affect cgroup v1 hosts.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
This commit is contained in:
Akihiro Suda 2020-04-21 23:56:23 +09:00
parent ba8129b28a
commit 4714ab5d6c
1 changed files with 17 additions and 1 deletions
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18
daemon/daemon_unix.go
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@ -635,7 +635,23 @@ func VerifyCgroupDriver(config *config.Config) error {
// UsingSystemd returns true if cli option includes native.cgroupdriver=systemd
func UsingSystemd(config *config.Config) bool {
return getCD(config) == cgroupSystemdDriver
if getCD(config) == cgroupSystemdDriver {
return true
}
// On cgroup v2 hosts, default to systemd driver
if getCD(config) == "" && cgroups.IsCgroup2UnifiedMode() && IsRunningSystemd() {
return true
}
return false
}
// IsRunningSystemd is from https://github.com/opencontainers/runc/blob/46be7b612e2533c494e6a251111de46d8e286ed5/libcontainer/cgroups/systemd/common.go#L27-L33
func IsRunningSystemd() bool {
fi, err := os.Lstat("/run/systemd/system")
if err != nil {
return false
}
return fi.IsDir()
}
// verifyPlatformContainerSettings performs platform-specific validation of the