将使用 docker-compose 创建的容器连接到使用 docker run 创建的另一个容器

Question

I have the following container created with docker-compose (php:7.2.20-apache):

version: "3"
services
  php72:
    build:
     context: .
    ports:
      - 80:80
    volumes:
      - ./www:/var/www/html

And I have the following container created with docker run:

docker run --name mysql5 -p 3306:3306 -v mysql5-data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7.27

I can connect to the mysql with MySQL Workbench, but my applications in the first container (php7 created with docker-compose) can't connect to the database with same connection credentials.

How to solve this?

PS: It`sa test of a dev environment in MacOs

Answer 1

You could manage a user-defined bridge for them to communicate with each other, see this , detail as next:

1. Create a user-define bridge

$ docker network create my-net

2. Link mysql container to this network

$ docker run --name mysql5 -p 3306:3306 -v mysql5-data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7.27
$ docker network connect my-net mysql5

3. Configure docker-compose to use the network

version: "3"
services
  php72:
    build:
     context: .
    ports:
      - 80:80
    volumes:
      - ./www:/var/www/html

networks:
  default:
    external:
      name: my-net

Then, from this :

User-defined bridges provide automatic DNS resolution between containers.

You can visit each other with service name or container name.

Answer 2

First make sure that you use the correct address in php:7.2.20-apache container for the database as your MySQL Workbench most likely use different ip address (eg 127.0.0.1) than the php:7.2.20-apache container (eg 172.19.0.1)

Make sure the containers are on same network by listing your networks with

docker network ls

And if they are not, connect them to same one with

docker network connect

Usage: docker network connect [OPTIONS] NETWORK CONTAINER (See 'docker network connect --help' for more info.)

You can get more info about each network with command

docker network inspect

Usage: docker network inspect [OPTIONS] NETWORK [NETWORK...]