CODEWITHSUNDEEP
dockerdocker-compose
davethegr8
davethegr8

Reputation: 11595

Docker composer project can't find/ping or connect to internal hostnames

I'm running a docker project using compose (on Ubuntu 14 for what it's worth) and one of my containers can't find/see/ping/connect to one of my other containers.

The worker container can't ping or connect to the db container, and I can't - for the life of me - understand why.

This is my project:

docker-compose.yml

version: '2'

services:
  web:
    build: ./web
    depends_on:
      - db
    volumes:
      - ./web/:/app/src
    ports:
      - "80:80"
      - "443:443"
  db:
    build: ./db
    volumes:
      - "./.data/db:/var/lib/mysql"
      - ./db/init:/docker-entrypoint-initdb.d
    environment:
      MYSQL_DATABASE: redacted
      MYSQL_USER: redacted
      MYSQL_PASSWORD: redacted
  worker:
    build: ./worker
    volumes:
      - ./worker/:/app
    depends_on:
      - db

worker/Dockerfile

FROM php:5.6-alpine
RUN docker-php-ext-install pdo_mysql

ADD redacted.php /app/redacted.php
CMD ["/app/redacted.php"]

worker/redacted.php

echo shell_exec('ping db -c 2');
$dbh = new PDO("mysql:host=db;dbname=redacted", "redacted", "redacted");

The output is:

worker_1  | ping: bad address 'db'
worker_1  | Warning: PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Try again in /app/redacted.php on line 29
worker_1  | SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Try again

Upvotes: 1

Views: 3079

Answers (1)

Mateusz Moneta
Mateusz Moneta

Reputation: 1640

You need link in your docker-compose.yml. Use it instead of depends_on because it also fullfil depends_on purpose:

...
worker:
    build: ./worker
    volumes:
      - ./worker/:/app
    links:
      - db

More informations: https://docs.docker.com/compose/compose-file/#/links

Upvotes: 3

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