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Restart the init container to not be stuck in created state

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The main sync loop should have created and started the container in one
step. If the init container is in the 'created' state, it's likely that
the container runtime failed to start it. To prevent the container from
getting stuck in the 'created' state, restart it.
This commit is contained in:
Gunju Kim 2024-08-05 19:49:42 +09:00
parent cb7b4ea648
commit 4363a8453c
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GPG Key ID: 9300A528F3F0DAB7
2 changed files with 24 additions and 3 deletions
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7
pkg/kubelet/kuberuntime/kuberuntime_container.go
View File

@ -1084,7 +1084,12 @@ func (m *kubeGenericRuntimeManager) computeInitContainerActions(pod *v1.Pod, pod
switch status.State {
case kubecontainer.ContainerStateCreated:
// nothing to do but wait for it to start
// The main sync loop should have created and started the container
// in one step. If the init container is in the 'created' state,
// it is likely that the container runtime failed to start it. To
// prevent the container from getting stuck in the 'created' state,
// restart it.
changes.InitContainersToStart = append(changes.InitContainersToStart, i)
case kubecontainer.ContainerStateRunning:
if !types.IsRestartableInitContainer(container) {

20
pkg/kubelet/kuberuntime/kuberuntime_manager_test.go
View File

@ -1170,6 +1170,17 @@ func TestComputePodActions(t *testing.T) {
ContainersToStart: []int{1},
},
},
"Restart the container if the container is in created state": {
mutatePodFn: func(pod *v1.Pod) { pod.Spec.RestartPolicy = v1.RestartPolicyNever },
mutateStatusFn: func(status *kubecontainer.PodStatus) {
status.ContainerStatuses[1].State = kubecontainer.ContainerStateCreated
},
actions: podActions{
SandboxID: baseStatus.SandboxStatuses[0].Id,
ContainersToKill: map[kubecontainer.ContainerID]containerToKillInfo{},
ContainersToStart: []int{1},
},
},
} {
pod, status := makeBasePodAndStatus()
if test.mutatePodFn != nil {
@ -1527,12 +1538,17 @@ func TestComputePodActionsWithRestartableInitContainers(t *testing.T) {
ContainersToKill: getKillMapWithInitContainers(basePod, baseStatus, []int{}),
},
},
"initialization in progress; do nothing": {
"an init container is stuck in the created state; restart it": {
mutatePodFn: func(pod *v1.Pod) { pod.Spec.RestartPolicy = v1.RestartPolicyAlways },
mutateStatusFn: func(pod *v1.Pod, status *kubecontainer.PodStatus) {
status.ContainerStatuses[2].State = kubecontainer.ContainerStateCreated
},
actions: noAction,
actions: podActions{
SandboxID: baseStatus.SandboxStatuses[0].Id,
InitContainersToStart: []int{2},
ContainersToStart: []int{},
ContainersToKill: getKillMapWithInitContainers(basePod, baseStatus, []int{}),
},
},
"restartable init container has started; start the next": {
mutatePodFn: func(pod *v1.Pod) { pod.Spec.RestartPolicy = v1.RestartPolicyAlways },