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fix migration of single-node clusters (#2134)

This commit is contained in:
Felix Kunde 2022-12-09 12:42:10 +01:00 committed by GitHub
parent 4d585250db
commit 0bef3b325f
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1 changed files with 10 additions and 13 deletions
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23
pkg/cluster/pod.go
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@ -214,19 +214,16 @@ func (c *Cluster) movePodFromEndOfLifeNode(pod *v1.Pod) (*v1.Pod, error) {
// MigrateMasterPod migrates master pod via failover to a replica
func (c *Cluster) MigrateMasterPod(podName spec.NamespacedName) error {
var (
masterCandidateName spec.NamespacedName
err error
eol bool
err error
eol bool
)
oldMaster, err := c.KubeClient.Pods(podName.Namespace).Get(context.TODO(), podName.Name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("could not get pod: %v", err)
return fmt.Errorf("could not get master pod: %v", err)
}
c.logger.Infof("starting process to migrate master pod %q", podName)
if eol, err = c.podIsEndOfLife(oldMaster); err != nil {
return fmt.Errorf("could not get node %q: %v", oldMaster.Spec.NodeName, err)
}
@ -250,21 +247,21 @@ func (c *Cluster) MigrateMasterPod(podName spec.NamespacedName) error {
}
c.Statefulset = sset
}
// We may not have a cached statefulset if the initial cluster sync has aborted, revert to the spec in that case.
// we may not have a cached statefulset if the initial cluster sync has aborted, revert to the spec in that case
masterCandidateName := podName
masterCandidatePod := oldMaster
if *c.Statefulset.Spec.Replicas > 1 {
if masterCandidateName, err = c.getSwitchoverCandidate(oldMaster); err != nil {
return fmt.Errorf("could not find suitable replica pod as candidate for failover: %v", err)
}
masterCandidatePod, err = c.KubeClient.Pods(masterCandidateName.Namespace).Get(context.TODO(), masterCandidateName.Name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("could not get master candidate pod: %v", err)
}
} else {
c.logger.Warningf("migrating single pod cluster %q, this will cause downtime of the Postgres cluster until pod is back", c.clusterName())
}
masterCandidatePod, err := c.KubeClient.Pods(masterCandidateName.Namespace).Get(context.TODO(), masterCandidateName.Name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("could not get master candidate pod: %v", err)
}
// there are two cases for each postgres cluster that has its master pod on the node to migrate from:
// - the cluster has some replicas - migrate one of those if necessary and failover to it
// - there are no replicas - just terminate the master and wait until it respawns