Xtykutl

I am running Rails + MySQL + Redis with docker-compose up. However, I don't know why my Rails container will be running for 30 seconds, and then be killed.

Here is my docker-compose.yml

version: '2'

services:

  db:

    image: mysql:5.7

    restart: always

    environment:

      - MYSQL_ROOT_PASSWORD=password

      - MYSQL_DATABASE=pubsub_1_development

      - MYSQL_USER=appuser

      - MYSQL_PASSWORD=password

    ports:

      - "3307:3306"



  redis:

    image: 'redis:4.0-alpine'

    ports:

      - '6379:6379'



  app:

    image: pubsub_1:0.0.1

    command: bundle exec rails s -p 3000 -b '0.0.0.0'

    volumes:

      - ".:/pubsub_1"

    ports:

      - "3001:3000"

    depends_on:

      - db

      - redis

    links:

      - db

      - redis

    environment:

      DB_USER: root

      DB_NAME: pubsub_1_development

      DB_PASSWORD: password

      DB_HOST: db

I notice some errors in logs, but I am not sure where to fix this problem.

app_1    | => Booting Puma

app_1    | => Rails 5.1.6 application starting in development

app_1    | => Run `rails server -h` for more startup options

app_1    | Puma starting in single mode...

app_1    | * Version 3.12.0 (ruby 2.5.1-p57), codename: Llamas in Pajamas

app_1    | * Min threads: 5, max threads: 5

app_1    | * Environment: development

app_1    | * Listening on tcp://0.0.0.0:3000

app_1    | Use Ctrl-C to stop

app_1    | Started GET "/" for 172.19.0.1 at 2018-11-09 07:47:35 +0000

app_1    | Cannot render console from 172.19.0.1! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255

app_1    |    (0.6ms)  SET NAMES utf8,  @@SESSION.sql_mode = CONCAT(CONCAT(@@sql_mode, ',STRICT_ALL_TABLES'), ',NO_AUTO_VALUE_ON_ZERO'),  @@SESSION.sql_auto_is_null = 0, @@SESSION.wait_timeout = 2147483

app_1    |    (0.6ms)  SELECT `schema_migrations`.`version` FROM `schema_migrations` ORDER BY `schema_migrations`.`version` ASC

app_1    | Processing by HomeController#index as HTML

app_1    |   User Load (0.6ms)  SELECT  `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1

app_1    |   Rendering home/index.html.erb within layouts/application

app_1    |   Event Load (0.6ms)  SELECT `events`.* FROM `events` WHERE `events`.`user_id` = 1

app_1    |   Rendered home/index.html.erb within layouts/application (15.4ms)

app_1    | Completed 200 OK in 1266ms (Views: 1165.0ms | ActiveRecord: 5.3ms)

app_1    |

app_1    |

app_1    | Started GET "/cable" for 172.19.0.1 at 2018-11-09 07:47:39 +0000

app_1    | Cannot render console from 172.19.0.1! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255

app_1    | Started GET "/cable/" [WebSocket] for 172.19.0.1 at 2018-11-09 07:47:39 +0000

app_1    | Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)

app_1    |   User Load (1.1ms)  SELECT  `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1

app_1    | Registered connection (Z2lkOi8vcHVic3ViMS9Vc2VyLzE)

app_1    | #<Thread:0x00007f2af4029e70@/usr/local/bundle/gems/actioncable-5.1.6/lib/action_cable/subscription_adapter/redis.rb:144 run> terminated with exception (report_on_exception is true):

app_1    | /usr/local/lib/ruby/2.5.0/socket.rb:1213:in `__connect_nonblock': Cannot assign requested address - connect(2) for [::1]:6379 (Errno::EADDRNOTAVAIL)

app_1    | Exiting

Here is the comprehensive log file
https://gist.github.com/fifiteen82726/308fcfd3b016f20de66e1b857d997d15

Looks like your Rails App is trying to connect to Redis on the localhost where Redis is not available. And seems like this causes the whole app service to stop. Instead of localhost, it should use the hostname redis for Redis in the config of the app.