A python script that attempts to connect to a UNIX socket. This is useful when verifying if a container can reach a host socket, or has permissions issues with your current settings.

unix-socket-checker.py

#!/usr/bin/python

import os
import sys
import time
import logging
import socket


def check_unix_socket():
    SOCKET_LOCATION = "/var/run/docker.sock"
    RETRY_TIMER = 10

    logging.info("Beginning check_unix_socket")
    logger = logging.getLogger("check_unix_socket")
    logger.setLevel(logging.DEBUG) 

    if os.getenv('UNIX_SOCKET_LOCATION') is not None:
        SOCKET_LOCATION = os.environ['UNIX_SOCKET_LOCATION']

    if os.getenv('RETRY_TIMER') is not None:
        RETRY_TIMER = int(os.environ['RETRY_TIMER'])

    logger.info("Using UNIX socket %s. Now attempting to connect to socket..." % (SOCKET_LOCATION))
    while True:
        try:
            sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
            sock.connect(SOCKET_LOCATION)
            logger.info("Successfully connected to UNIX socket %s.  Closing socket and retrying in %d seconds." % (SOCKET_LOCATION, RETRY_TIMER))
            sock.close()
        except Exception as e:
            logger.error("Failed to connect to socket %s with exception {%s}" % (SOCKET_LOCATION, e))
            logger.error("Retrying in %d seconds..." % (RETRY_TIMER))

        time.sleep(RETRY_TIMER)


if __name__ == '__main__':
    sys.exit(check_unix_socket())