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Standby cluster promotion by changing manifest (#2472)

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* Standby cluster promotion by changing manifest
* Updated the documentation

---------

Co-authored-by: Senthilnathan M <snathanm@vmware.com>
This commit is contained in:
Felix Kunde
2024-01-04 12:33:50 +01:00
committed by GitHub
co-authored by Senthilnathan M
parent bbba15f9bf
commit dad5b132ec
5 changed files with 212 additions and 25 deletions
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pkg/cluster/sync.go
+47
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@@ -84,6 +84,13 @@ func (c *Cluster) Sync(newSpec *acidv1.Postgresql) error {
}
}
// add or remove standby_cluster section from Patroni config depending on changes in standby section
if reflect.DeepEqual(oldSpec.Spec.StandbyCluster, newSpec.Spec.StandbyCluster) {
if err := c.syncStandbyClusterConfiguration(); err != nil {
return fmt.Errorf("could not sync StandbyCluster configuration: %v", err)
}
}
c.logger.Debug("syncing pod disruption budgets")
if err = c.syncPodDisruptionBudget(false); err != nil {
err = fmt.Errorf("could not sync pod disruption budget: %v", err)
@@ -710,6 +717,46 @@ func (c *Cluster) checkAndSetGlobalPostgreSQLConfiguration(pod *v1.Pod, effectiv
return configPatched, requiresMasterRestart, nil
}
// syncStandbyClusterConfiguration checks whether standby cluster
// parameters have changed and if necessary sets it via the Patroni API
func (c *Cluster) syncStandbyClusterConfiguration() error {
var (
err error
pods []v1.Pod
)
standbyOptionsToSet := make(map[string]interface{})
if c.Spec.StandbyCluster != nil {
c.logger.Infof("turning %q into a standby cluster", c.Name)
standbyOptionsToSet["create_replica_methods"] = []string{"bootstrap_standby_with_wale", "basebackup_fast_xlog"}
standbyOptionsToSet["restore_command"] = "envdir \"/run/etc/wal-e.d/env-standby\" /scripts/restore_command.sh \"%f\" \"%p\""
} else {
c.logger.Infof("promoting standby cluster and detach from source")
standbyOptionsToSet = nil
}
if pods, err = c.listPods(); err != nil {
return err
}
if len(pods) == 0 {
return fmt.Errorf("could not call Patroni API: cluster has no pods")
}
// try all pods until the first one that is successful, as it doesn't matter which pod
// carries the request to change configuration through
for _, pod := range pods {
podName := util.NameFromMeta(pod.ObjectMeta)
c.logger.Debugf("patching Postgres config via Patroni API on pod %s with following options: %s",
podName, standbyOptionsToSet)
if err = c.patroni.SetStandbyClusterParameters(&pod, standbyOptionsToSet); err == nil {
return nil
}
c.logger.Warningf("could not patch postgres parameters within pod %s: %v", podName, err)
}
return fmt.Errorf("could not reach Patroni API to set Postgres options: failed on every pod (%d total)",
len(pods))
}
func (c *Cluster) syncSecrets() error {
c.logger.Info("syncing secrets")
c.setProcessName("syncing secrets")