Restart nodebb if 504 bad gateway error

restart-nodebb.py

#!/usr/bin/python
import requests
import subprocess
import time, signal, logging
import os

logging.basicConfig(level=logging.INFO)

cur_dir     = os.path.dirname(os.path.abspath(__file__))
nodebb_path = os.path.join(cur_dir, 'nodebb')

def check_forum_up():
    r = requests.get('http://nodebb.somehost.com')
    if r.status_code == 504:
        logging.warning('NodeBB restarted!')
        subprocess.check_call([nodebb_path, 'reload'])
    elif r.status_code == 502:
	subprocess.check_call([nodebb_path, 'start'])
        logging.warning('NodeBB started!')
    else:
        logging.info('NodeBB works fine')

def sigterm_handler(signum, frame):
    logging.warning('Shut down restart502.py.')
    exit(0)

if __name__ == "__main__":
    logging.info('Script started!')
    signal.signal(signal.SIGTERM, sigterm_handler)
    while True:
        check_forum_up()
        time.sleep(5*60) # check every 5 minutes

Sample supervisor config to run restart-nodebb script:
[program:restartnodebb]
command=sudo -i /bin/bash -c -i "cd /home/app/nodebb && /home/app/nodebb/restart-nodebb.py"
directory=/home/app/nodebb
user=root
redirect_stderr=true
autostart=true
stdout_logfile=/home/app/nodebb/restart.log
stdout_logfile_maxbytes=1MB
autorestart=true
priority=10