docker-compose

version: '3.4'

services:

    kosmos-app:
        container_name: kosmos_app
        build:
            context: .
            dockerfile: backend_Dockerfile
        env_file:
            - .env
        environment:
            - STATIC_ROOT=/opt/kosmos/frontend
        restart: always
        network_mode: "host"
        healthcheck:
            test: curl -f http://localhost:8080/backend/healthcheck || exit 1
            interval: 1m
            timeout: 1m
            retries: 3
            start_period: 5s
#        depends_on:
#            - kosmos-db

    kosmos-cron:
        container_name: kosmos_cron
        build:
            context: .
            dockerfile: engine_Dockerfile
        env_file:
            - .env
        environment:
            - BACKEND_URL=http://kosmos-app:8080
        restart: always
        network_mode: "host"
#        depends_on:
#            - kosmos-db

#    kosmos-db:
#        container_name: kosmos_db
#        image: postgres:latest
#        restart: always
#        env_file:
#            - .env
#        volumes:
#            - ./postgresql-kosmos-volume:/var/lib/postgresql
#            - ./precreate_db.sql:/precreate_db.sql
#        ports:
#            - 15432:5432

restart_server.py

import requests

from settings import BACKEND_URL, BACKEND_SERVICE_KEY


def refill():
    success = True
    print(BACKEND_URL)

    r = requests.get(f'{BACKEND_URL}/backend/action/refill', params={'service_key': BACKEND_SERVICE_KEY})
    try:
        r = requests.get(f'{BACKEND_URL}/backend/action/refill', params={'service_key': BACKEND_SERVICE_KEY})
        print('Responce', r.content)

        if not r.content == b"Table's cache refilled":
            success = False
    except:
        print('Error while refilling the cache')
        success = False

    return success

Traceback.py

kosmos_cron    | start at 2020-06-19 07:12:01.918786
kosmos_cron    | http://kosmos-app:8080
kosmos_cron    | Traceback (most recent call last):
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/connection.py", line 160, in _new_conn
kosmos_cron    |     (self._dns_host, self.port), self.timeout, **extra_kw
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/util/connection.py", line 61, in create_connection
kosmos_cron    |     for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
kosmos_cron    |   File "/usr/local/lib/python3.7/socket.py", line 752, in getaddrinfo
kosmos_cron    |     for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
kosmos_cron    | socket.gaierror: [Errno -3] Temporary failure in name resolution
kosmos_cron    | 
kosmos_cron    | During handling of the above exception, another exception occurred:
kosmos_cron    | 
kosmos_cron    | Traceback (most recent call last):
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 677, in urlopen
kosmos_cron    |     chunked=chunked,
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 392, in _make_request
kosmos_cron    |     conn.request(method, url, **httplib_request_kw)
kosmos_cron    |   File "/usr/local/lib/python3.7/http/client.py", line 1252, in request
kosmos_cron    |     self._send_request(method, url, body, headers, encode_chunked)
kosmos_cron    |   File "/usr/local/lib/python3.7/http/client.py", line 1298, in _send_request
kosmos_cron    |     self.endheaders(body, encode_chunked=encode_chunked)
kosmos_cron    |   File "/usr/local/lib/python3.7/http/client.py", line 1247, in endheaders
kosmos_cron    |     self._send_output(message_body, encode_chunked=encode_chunked)
kosmos_cron    |   File "/usr/local/lib/python3.7/http/client.py", line 1026, in _send_output
kosmos_cron    |     self.send(msg)
kosmos_cron    |   File "/usr/local/lib/python3.7/http/client.py", line 966, in send
kosmos_cron    |     self.connect()
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/connection.py", line 187, in connect
kosmos_cron    |     conn = self._new_conn()
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/connection.py", line 172, in _new_conn
kosmos_cron    |     self, "Failed to establish a new connection: %s" % e
kosmos_cron    | urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x7ff3711107d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution
kosmos_cron    | 
kosmos_cron    | During handling of the above exception, another exception occurred:
kosmos_cron    | 
kosmos_cron    | Traceback (most recent call last):
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 449, in send
kosmos_cron    |     timeout=timeout
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/connectionpool.py", line 725, in urlopen
kosmos_cron    |     method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/urllib3/util/retry.py", line 439, in increment
kosmos_cron    |     raise MaxRetryError(_pool, url, error or ResponseError(cause))
kosmos_cron    | urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='kosmos-app', port=8080): Max retries exceeded with url: /backend/action/refill?service_key=test_service_key (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7ff3711107d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'))
kosmos_cron    | 
kosmos_cron    | During handling of the above exception, another exception occurred:
kosmos_cron    | 
kosmos_cron    | Traceback (most recent call last):
kosmos_cron    |   File "/opt/kosmos/engine/main.py", line 55, in <module>
kosmos_cron    |     copy_wrapper(restart_server.refill, 'Refill backend cache') # about 30 seconds
kosmos_cron    |   File "/opt/kosmos/engine/main.py", line 32, in copy_wrapper
kosmos_cron    |     success = func()
kosmos_cron    |   File "/opt/kosmos/engine/restart_server.py", line 10, in refill
kosmos_cron    |     r = requests.get(f'{BACKEND_URL}/backend/action/refill', params={'service_key': BACKEND_SERVICE_KEY})
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/requests/api.py", line 76, in get
kosmos_cron    |     return request('get', url, params=params, **kwargs)
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/requests/api.py", line 61, in request
kosmos_cron    |     return session.request(method=method, url=url, **kwargs)
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 530, in request
kosmos_cron    |     resp = self.send(prep, **send_kwargs)
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/requests/sessions.py", line 643, in send
kosmos_cron    |     r = adapter.send(request, **kwargs)
kosmos_cron    |   File "/usr/local/lib/python3.7/site-packages/requests/adapters.py", line 516, in send
kosmos_cron    |     raise ConnectionError(e, request=request)
kosmos_cron    | requests.exceptions.ConnectionError: HTTPConnectionPool(host='kosmos-app', port=8080): Max retries exceeded with url: /backend/action/refill?service_key=test_service_key (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7ff3711107d0>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'))