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File name : check_ipaliases.py

Content :

#!/usr/bin/env python3
"""

This script checks additional IPs listed in /etc/ips on a cPanel/WHM server to ensure they are configured and active.
If any IPs are missing, it attempts to restart the 'ipaliases' service via /scripts/restartsrv_ipaliases.
- If all IPs are up: exits OK (code 0)
- If IPs are restored after restart: exits OK (code 0)
- If IPs are still missing after restart: exits CRITICAL (code 2)
- If /etc/ips is empty: exits OK with a message indicating no additional IPs found
- If any error occurs: exits UNKNOWN (code 3)

"""

import subprocess
import sys
import time

IP_FILE = "/etc/ips"

def read_ips(file_path=IP_FILE):
    try:
        with open(file_path, 'r') as f:
            return [line.strip().split(':')[0] for line in f if line.strip() and not line.startswith('#')]
    except Exception as e:
        print(f"UNKNOWN - Failed to read {file_path}: {e}")
        sys.exit(3)

def check_ip_up(ip):
    try:
        output = subprocess.check_output(['ip', 'addr'], encoding='utf-8')
        return ip in output
    except subprocess.CalledProcessError as e:
        print(f"UNKNOWN - Failed to execute 'ip addr': {e}")
        sys.exit(3)

def restart_ipaliases():
    try:
        subprocess.check_call(['/scripts/restartsrv_ipaliases'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        time.sleep(5)  # Allow time for interface setup
    except subprocess.CalledProcessError:
        # Fail silently, outcome is rechecked by the caller
        pass

def main():
    expected_ips = read_ips()

if not expected_ips:
        print("OK - No additional IPs found.")
        sys.exit(0)

down_ips = [ip for ip in expected_ips if not check_ip_up(ip)]

if not down_ips:
        print(f"OK - All {len(expected_ips)} additional IPs are up.")
        sys.exit(0)

# Attempt to fix by restarting
    restart_ipaliases()
    still_down = [ip for ip in down_ips if not check_ip_up(ip)]

if still_down:
        print(f"CRITICAL - IPs still down after restart: {', '.join(still_down)}")
        sys.exit(2)
    else:
        print(f"OK - IPs were down, recovered after restart.")
        sys.exit(0)

if __name__ == "__main__":
    main()

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