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Suppress status unset in cmdDel

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This change stops to update status in CNI's DEL command.
There are two reasons:

1. cmd DEL is invoked at only pod deletion, hence k8s does not
guarantee the pod and it may be already deleted. Hence this
API may failed.

2. In stateful set's pod recreation case, it may have race
condition to update the status at cmd DEL case.
In stateful set case, same pod name, i.e. stateful-0, is deleted
and then created again. In this case, if old Pod's CNI DEL command
is not finished before new Pod's creation, then SetStatus function
is failed due to pod UID mismatch.
This commit is contained in:
Tomofumi Hayashi
2023-10-02 16:25:03 +09:00
parent d7e391e006
commit 46fe38e2c5
2 changed files with 10 additions and 33 deletions
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31
pkg/multus/multus.go
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@@ -814,21 +814,7 @@ func CmdDel(args *skel.CmdArgs, exec invoke.Exec, kubeClient *k8s.ClientInfo, po
return err
}
skipStatusUpdate := false
netns, err := ns.GetNS(args.Netns)
if err != nil {
// if NetNs is passed down by the Cloud Orchestration Engine, or if it called multiple times
// so don't return an error if the device is already removed.
// https://github.com/kubernetes/kubernetes/issues/43014#issuecomment-287164444
_, ok := err.(ns.NSPathNotExistErr)
skipStatusUpdate = true
if ok {
logging.Debugf("CmdDel: WARNING netns may not exist, netns: %s, err: %s", args.Netns, err)
} else {
logging.Debugf("CmdDel: WARNING failed to open netns %q: %v", netns, err)
}
}
if netns != nil {
defer netns.Close()
}
@@ -853,8 +839,6 @@ func CmdDel(args *skel.CmdArgs, exec invoke.Exec, kubeClient *k8s.ClientInfo, po
if err != nil {
// GetPod may be failed but just do print error in its log and continue to delete
logging.Errorf("Multus: GetPod failed: %v, but continue to delete", err)
// skip status update because k8s api seems to be stucked
skipStatusUpdate = true
}
// Read the cache to get delegates json for the pod
@@ -919,21 +903,6 @@ func CmdDel(args *skel.CmdArgs, exec invoke.Exec, kubeClient *k8s.ClientInfo, po
}
}
// unset the network status annotation in apiserver, only in case Multus as kubeconfig
if kubeClient != nil {
if !skipStatusUpdate {
if !types.CheckSystemNamespaces(string(k8sArgs.K8S_POD_NAMESPACE), in.SystemNamespaces) {
err := k8s.SetNetworkStatus(kubeClient, k8sArgs, nil, in)
if err != nil {
// error happen but continue to delete
logging.Errorf("Multus: error unsetting the networks status: %v", err)
}
}
} else {
logging.Debugf("WARNING: Unset SetNetworkStatus skipped")
}
}
e := delPlugins(exec, pod, args, k8sArgs, in.Delegates, len(in.Delegates)-1, in.RuntimeConfig, in)
// Enable Option only delegate plugin delete success to delete cache file