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info: report cgroup driver as "none" when running rootless

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Previously `docker info` had reported "cgroupfs" as the cgroup driver
but the driver wasn't actually used at all.

This PR reports "none" as the cgroup driver so as to avoid confusion.
e.g. kubeadm/kubelet will detect cgroupless-ness by checking this docker
info field. https://github.com/rootless-containers/usernetes/pull/97

Note that user still cannot specify `native.cgroupdriver=none` manually.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
(cherry picked from commit 153466ba0a)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Akihiro Suda 2019-06-03 00:03:27 +09:00 • committed by Sebastiaan van Stijn
parent a62d9b9c21
commit 57b59f876e
No known key found for this signature in database
GPG key ID: 76698F39D527CE8C
1 changed files with 7 additions and 0 deletions

7
daemon/daemon_unix.go
View file

@ -73,6 +73,7 @@ const (
// constant for cgroup drivers
cgroupFsDriver = "cgroupfs"
cgroupSystemdDriver = "systemd"
cgroupNoneDriver = "none"
// DefaultRuntimeName is the default runtime to be used by
// containerd if none is specified
@ -575,6 +576,9 @@ func verifyPlatformContainerResources(resources *containertypes.Resources, sysIn
}
func (daemon *Daemon) getCgroupDriver() string {
if daemon.Rootless() {
return cgroupNoneDriver
}
cgroupDriver := cgroupFsDriver
if UsingSystemd(daemon.configStore) {
@ -601,6 +605,9 @@ func VerifyCgroupDriver(config *config.Config) error {
if cd == "" || cd == cgroupFsDriver || cd == cgroupSystemdDriver {
return nil
}
if cd == cgroupNoneDriver {
return fmt.Errorf("native.cgroupdriver option %s is internally used and cannot be specified manually", cd)
}
return fmt.Errorf("native.cgroupdriver option %s not supported", cd)
}