check_mongodb.py

import socket


def has_mongodb(host, port=27017):
    try:
        host_addr = socket.gethostbyname(host)

        if not host_addr:
            return False

        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(1)
        s.connect((host, port))
        s.close()
    except KeyboardInterrupt:
        raise
    except:
        return False

    return True
  
print(has_mongodb('domain.tld')