Add nagios check for Redis Sentinel synchro

nagios-nrpe/files/plugins/check_redis_sentinel_sync

@@ -0,0 +1,46 @@
+#!/bin/sh
+#
+# Verify the synchroniation of Redis Sentinel slaves.
+
+output=$(mktemp --tmpdir $(basename "$0").XXXXXXXXXX)
+critical_count=0
+ok_count=0
+
+trap "rm -f $output" EXIT
+
+input=$(redis-cli -p 6380 sentinel slaves redis |  sed 'N;s/\n/=/')
+
+#while read -r line; do 
+for line in $input; do 
+    case "$line" in
+        name=*) name=${line#name=} ;;
+        master-link-status=*) status=${line#master-link-status=} ;;
+    esac 
+    if [ -n "$name" ] && [ -n "$status" ]; then
+        if [ "$status" = ok ]; then
+            echo "OK - $name" >> "$output"
+            ok_count=$(( ok_count + 1))
+        else
+            echo "CRITICAL - $name" >> "$output"
+            critical_count=$(( critical_count + 1))
+        fi
+        unset name status
+    fi
+done
+
+total_count=$(( ok_count + critical_count ))
+
+plural=''
+test "$total_count" -gt 1 && plural='s'
+
+if [ $ok_count -eq  $total_count ]; then
+     printf "OK - %d/%d  Redis Sentinel slave%s are in sync\n\n" \
+         "$ok_count" "$total_count" "$plural"
+     cat "$output"
+     exit 0
+else
+    printf "CRITICAL - %d/%d Redis Sentinal slave%s aren't in sync\n\n" \
+        "$critical_count" "$total_count" "$plural"
+    cat "$output"
+    exit 2 
+fi