How to connect to mysql docker instance using localhost over network bridge?

Question

I am running MySQL via docker-compose and trying to connect to it from the host, not another container, via a JDBC connection string for an app running on the host and not in a container. The environment is locked down, I cannot create new docker networks or bind a container to 'host' network, bridge is the only option. I can connect to the MySQL instance using the IP address of the container, but this is not much use - I need to use localhost or 127.0.0.1 . Is this possible? If so, how?

docker-compose.yml

version: '2.2'
services:
  db:
    container_name: mysql_db
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_DATABASE: 'test-db'
      MYSQL_USER: 'test-user'
      MYSQL_PASSWORD: 'password'
      MYSQL_ROOT_PASSWORD: 'password'
    network_mode: bridge
    ports:
      - '3306:3306'
    expose:
      - '3306'
volumes:
  my-db:

I can connect using the container's IP, like so:

 jdbc:mysql://172.17.0.3:3306/test-db

But cannot connect using localhost , 127.0.0.1 or the container name mysql_db like so:

jdbc:mysql://localhost:3306/test-db
jdbc:mysql://127.0.0.1:3306/test-db
jdbc:mysql://mysql_db:3306/test-db

Any ideas?

Answer 1

Since 127.0.0.1 and localhost means the host your docker is currently running, so you cannot connect to your host's mysql .

I also recommend connect container using hostname :

docker run -it --network bridge --rm mysql mysql -hmysql_db -utest-user –ppassword