feat(node): try to manage scale up and scale down

resources/node/files/scripts/startSentinel.sh

@@ -1,14 +1,12 @@
 #!/bin/sh
 
-PATH=${PATH}:/
-SENTINEL_MASTER=""
-
 # Generate sentinel.conf file for Valkey Sentinel
 source /opt/scripts/common.sh
 
-if [ -f /etc/valkey/sentinel.conf ]; then
-    echo "Sentinel configuration file already exists, starting with this."
-else
+PATH=${PATH}:/
+SENTINEL_MASTER=""
+
+updateSentinelMaster(){
     cp /etc/valkey/sentinel.conf.orig /etc/valkey/sentinel.conf
     hostname=$(hostname -f)
 
@@ -16,11 +14,25 @@ else
     if [ $? -ne 0 ]; then
         SENTINEL_MASTER=$(hostname -f)
     else
-        getPrimaryInfo
         SENTINEL_MASTER=$(getSentinelMasterName)
     fi
 
     sed -i "s/SENTINEL_MASTER/${SENTINEL_MASTER}/g" /etc/valkey/sentinel.conf
+
+}
+
+
+if [ -f /etc/valkey/sentinel.conf ]; then
+    echo "Sentinel configuration file already exists, starting with this."
+    reps=$(awk -F ':' '/REPLICAS/ {print $2}' /etc/valkey/sentinel.conf)
+    if [ "${reps}" = "${VALKEY_REPLICAS}" ]; then
+        echo "Sentinel configuration file already has the correct number of replicas (${VALKEY_REPLICAS})."
+    else
+        echo "Updating Sentinel configuration file with the correct number of replicas (${VALKEY_REPLICAS})."
+        updateSentinelMaster
+    fi
+else
+    updateSentinelMaster
 fi
 
 valkey-sentinel /etc/valkey/sentinel.conf