Trigger a save of the cluster configuration file before shutting down

src/cluster.h

@@ -39,6 +39,7 @@ void clusterInitLast(void);
 void clusterCron(void);
 void clusterBeforeSleep(void);
 int verifyClusterConfigWithData(void);
+void clusterHandleServerShutdown(void);
 
 int clusterSendModuleMessageToTarget(const char *target,
                                      uint64_t module_id,
@@ -83,7 +84,6 @@ int getNodeDefaultClientPort(clusterNode *n);
 clusterNode *getMyClusterNode(void);
 int getClusterSize(void);
 int getMyShardSlotCount(void);
-int handleDebugClusterCommand(client *c);
 int clusterNodePending(clusterNode *node);
 int clusterNodeIsPrimary(clusterNode *n);
 char **getClusterNodesList(size_t *numnodes);

src/cluster_legacy.c

@@ -1136,6 +1136,20 @@ void clusterInitLast(void) {
     }
 }
 
+/* Called when a cluster node calls SHUTDOWN. */
+void clusterHandleServerShutdown(void) {
+    /* The error logs have been logged in the save function if the save fails. */
+    serverLog(LL_NOTICE, "Saving the cluster configuration file before exiting.");
+    clusterSaveConfig(1);
+
+#if !defined(__sun)
+    /* Unlock the cluster config file before shutdown, see clusterLockConfig. */
+    if (server.cluster_config_file_lock_fd != -1) {
+        flock(server.cluster_config_file_lock_fd, LOCK_UN | LOCK_NB);
+    }
+#endif /* __sun */
+}
+
 /* Reset a node performing a soft or hard reset:
  *
  * 1) All other nodes are forgotten.

src/server.c

@@ -4333,17 +4333,12 @@ int finishShutdown(void) {
      * send them pending writes. */
     flushReplicasOutputBuffers();
 
+    /* Handle cluster-related matters when shutdown. */
+    if (server.cluster_enabled) clusterHandleServerShutdown();
+
     /* Close the listening sockets. Apparently this allows faster restarts. */
     closeListeningSockets(1);
 
-#if !defined(__sun)
-    /* Unlock the cluster config file before shutdown */
-    if (server.cluster_enabled && server.cluster_config_file_lock_fd != -1) {
-        flock(server.cluster_config_file_lock_fd, LOCK_UN | LOCK_NB);
-    }
-#endif /* __sun */
-
-
     serverLog(LL_WARNING, "%s is now ready to exit, bye bye...", server.sentinel_mode ? "Sentinel" : "Valkey");
     return C_OK;