Problem with SSL Certificates

[theiosx]

I have removed all containers except "test" one.
Then I ran python script "monitor-docker-slack.py" and stopped container "test"
Afterr 300 seconds I see this. Seems like script cannot send message to slack.com:443

(app-root) bash-4.2# /monitor-docker-slack.sh
+ python /monitor-docker-slack.py --check_interval 300 --slack_token XXXXXXXXX/XXXXXXXXX/XXXXXXXXXXXXXXXXXXXXXXXX --whitelist '' --slack_channel unixteam --msg_prefix 'Monitoring on ncatlnxv17'
OK: Monitoring on ncatlnxv17
OK: detect no stopped or unhealthy containers
ERROR: Monitoring on ncatlnxv17
Detected Stopped Containers: 
['/test']: Exited (0) 4 minutes ago


Traceback (most recent call last):
  File "/opt/app-root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 595, in urlopen
    self._prepare_proxy(conn)
  File "/opt/app-root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 816, in _prepare_proxy
    conn.connect()
  File "/opt/app-root/lib/python3.6/site-packages/urllib3/connection.py", line 326, in connect
    ssl_context=context)
  File "/opt/app-root/lib/python3.6/site-packages/urllib3/util/ssl_.py", line 329, in ssl_wrap_socket
    return context.wrap_socket(sock, server_hostname=server_hostname)
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/ssl.py", line 407, in wrap_socket
    _context=self, _session=session)
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/ssl.py", line 814, in __init__
    self.do_handshake()
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/ssl.py", line 1068, in do_handshake
    self._sslobj.do_handshake()
  File "/opt/rh/rh-python36/root/usr/lib64/python3.6/ssl.py", line 689, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/app-root/lib/python3.6/site-packages/requests/adapters.py", line 440, in send
    timeout=timeout
  File "/opt/app-root/lib/python3.6/site-packages/urllib3/connectionpool.py", line 639, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "/opt/app-root/lib/python3.6/site-packages/urllib3/util/retry.py", line 388, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='slack.com', port=443): Max retries exceeded with url: /api/chat.postMessage (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)'),))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/monitor-docker-slack.py", line 151, in <module>
    channel = slack_channel, text = err_msg)
  File "/opt/app-root/lib/python3.6/site-packages/slackclient/client.py", line 83, in api_call
    result = json.loads(self.server.api_call(method, timeout=timeout, **kwargs))
  File "/opt/app-root/lib/python3.6/site-packages/slackclient/server.py", line 220, in api_call
    return self.api_requester.do(self.token, method, kwargs, timeout=timeout).text
  File "/opt/app-root/lib/python3.6/site-packages/slackclient/slackrequest.py", line 85, in do
    proxies=self.proxies)
  File "/opt/app-root/lib/python3.6/site-packages/requests/api.py", line 112, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/opt/app-root/lib/python3.6/site-packages/requests/api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "/opt/app-root/lib/python3.6/site-packages/requests/sessions.py", line 508, in request
    resp = self.send(prep, **send_kwargs)
  File "/opt/app-root/lib/python3.6/site-packages/requests/sessions.py", line 618, in send
    r = adapter.send(request, **kwargs)
  File "/opt/app-root/lib/python3.6/site-packages/requests/adapters.py", line 506, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: HTTPSConnectionPool(host='slack.com', port=443): Max retries exceeded with url: /api/chat.postMessage (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)'),))

[dennyzhang]

@theiosx thanks for reporting this.

So you seem to build the monitoring from your local box, instead of a docker container. Am I right?

From the error message, it fails in sending slack messages.

I'm guessing maybe your python slackclient version is not latest enough.
Here is the version I have installed in our docker image.
https://github.com/DennyZhang/monitor-docker-slack/blob/master/Dockerfile#L38