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Do not set cgroup parent when --cgroups-per-qos is disabled

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When --cgroups-per-qos=false (default is true), kubelet sets pod
container management to podContainerManagerNoop implementation and
GetPodContainerName() returns '/' as cgroup parent (default cgroup root).

(1) In case of 'systemd' cgroup driver, '/' is invalid parent as
docker daemon expects '.slice' suffix and throws this error:
'cgroup-parent for systemd cgroup should be a valid slice named as \"xxx.slice\"'
(5fc12449d8/daemon/daemon_unix.go (L618))
'/' corresponds to '-.slice' (root slice) in systemd but I don't think
we want to assign root slice instead of runtime specific default value.
In case of docker runtime, this will be 'system.slice'
(e2593239d9/daemon/oci_linux.go (L698))

(2) In case of 'cgroupfs' cgroup driver, '/' is valid parent but I don't
think we want to assign root instead of runtime specific default value.
In case of docker runtime, this will be '/docker'
(e2593239d9/daemon/oci_linux.go (L695))

Current fix will not set the cgroup parent when --cgroups-per-qos is disabled.
This commit is contained in:
Ravi Sankar Penta
2018-07-20 10:25:50 -07:00
parent 07387782ec
commit 0282720e29
1 changed files with 1 additions and 1 deletions
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2
pkg/kubelet/cm/pod_container_manager_linux.go
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@@ -299,7 +299,7 @@ func (m *podContainerManagerNoop) EnsureExists(_ *v1.Pod) error {
} }
func (m *podContainerManagerNoop) GetPodContainerName(_ *v1.Pod) (CgroupName, string) { func (m *podContainerManagerNoop) GetPodContainerName(_ *v1.Pod) (CgroupName, string) {
return m.cgroupRoot, m.cgroupRoot.ToCgroupfs() return m.cgroupRoot, ""
} }
func (m *podContainerManagerNoop) GetPodContainerNameForDriver(_ *v1.Pod) string { func (m *podContainerManagerNoop) GetPodContainerNameForDriver(_ *v1.Pod) string {