add new check and update other one

check_mysql_connections.py

@@ -0,0 +1,80 @@
+#!/usr/bin/env python
+import argparse
+import sys
+import traceback
+
+import mysql.connector
+
+from checker import nagios
+from checker.result import quit_check
+
+
+def main(args):
+    try:
+        connection = mysql.connector.connect(host=args.host, user=args.username, password=args.password)
+        cursor = connection.cursor()
+        cursor.execute("SHOW STATUS LIKE 'Threads_connected'")
+        result = cursor.fetchone()
+        active_connections = int(result[1])
+
+        cursor.execute("SHOW VARIABLES LIKE 'max_connections'")
+        result = cursor.fetchone()
+        max_connections = int(result[1])
+
+        cursor.close()
+        connection.close()
+
+    except mysql.connector.Error as e:
+        quit_check(f'unable to connect to MySQL server: {e}', nagios.STATE_CRIT)
+        return  # make pycharm happy
+
+    # ===================================================
+    # Parse data
+
+    warn_percent = args.warn_percent / 100
+    crit_percent = args.crit_percent / 100
+    active_connections_percent = active_connections / max_connections
+    active_connections_percent_str = str(int(active_connections_percent * 100))
+
+    if active_connections_percent > crit_percent:
+        exit_code = nagios.STATE_CRIT
+    elif active_connections_percent > warn_percent:
+        exit_code = nagios.STATE_WARN
+    else:
+        exit_code = nagios.STATE_OK
+
+    perfdata = {
+        'percent_active_connections': {
+            'value': active_connections_percent_str,
+            'min': 0,
+            'unit': '%',
+            'warn': int(warn_percent * 100),
+            'crit': int(crit_percent * 100)
+        },
+        'active_connections': {
+            'value': active_connections,
+            'min': 0,
+            'max': max_connections,
+            'warn': int(active_connections * warn_percent),
+            'crit': int(active_connections * crit_percent)
+        }
+    }
+    text_str = f'{active_connections}/{max_connections} ({active_connections_percent_str}%) of available connections used'
+    quit_check(text_str, exit_code, perfdata)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Check MySQL connections to a server.')
+    parser.add_argument('--host', required=True, help='The IP of the MySQL server to connect to.')
+    parser.add_argument('--username', required=True, help='Username.')
+    parser.add_argument('--password', required=True, help='Password.')
+    parser.add_argument('--warn-percent', default=50, type=int, help='Connections warning percentage. Default: 50%')
+    parser.add_argument('--crit-percent', default=75, type=int, help='Connections critical percentage. Default: 75%')
+    args = parser.parse_args()
+
+    try:
+        main(args)
+    except Exception as e:
+        print(f"UNKNOWN - {e}")
+        traceback.print_exc()
+        sys.exit(nagios.STATE_UNKNOWN)

check_mysql_slave.py

@@ -136,4 +136,10 @@ if __name__ == "__main__":
     parser.add_argument('--warning-deviation', default=10, type=int, help='If the delay deviates more than this percentage from the target delay, return warning.')
     parser.add_argument('--critical-deviation', default=15, type=int, help='If the delay deviates more than this percentage from the target delay, return critical.')
     args = parser.parse_args()
+
+    try:
         main(args)
+    except Exception as e:
+        print(f"UNKNOWN - {e}")
+        traceback.print_exc()
+        sys.exit(nagios.STATE_UNKNOWN)