Access to mysql container from other container

Question

I have setup docker container with mysql that expose 3306. I\'ve specified database user, database password and create a test db and give the privileges to new user.
In

Answer 1

The --link flag is considered a legacy feature, you should use user-defined networks.

You can run both containers on the same network:

docker run -d --name php_container --network my_network my_php_image

docker run -d --name mysql_container --network my_network my_mysql_image

Every container on that network will be able to communicate with each other using the container name as hostname.

Answer 2

In your docker-compose.yml file add a link property to your webserver service: https://docs.docker.com/compose/networking/#links

Then in your query string, the host parameter's value is your database service name:

$mysqli = new mysqli("database", "mattia", "prova", "prova");

Answer 3

You need to link your docker containers together with --link flag in docker run command or using link feature in docker-compose. For instance:

docker run -d -name app-container-name --link mysql-container-name app-image-name

In this way docker will add the IP address of the mysql container into /etc/hosts file of your application container. For a complete document refer to: MySQL Docker Containers: Understanding the basics