How to Access a MySQL Container from Other Containers in Docker Without IP Addresses?

Accessing MySQL Container from Other Containers without IP Addresses

In a Docker environment, you may encounter the need to connect to a MySQL container from another container. While it's possible to establish a connection using the MySQL container's IP address, this approach lacks flexibility. To improve accessibility, alternative methods exist.

One recommended solution is to utilize user-defined networks. This method offers several benefits over the legacy --link flag:

• Simplified configuration: User-defined networks allow you to specify a common network for all containers that require communication.
• Improved flexibility: Containers on the same network can communicate seamlessly without relying on static IP addresses.

To utilize user-defined networks, follow these steps:

1. Create a custom network:

docker network create my_network

2. Run the containers on the created 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

Once the containers are running on the same network, they can communicate using each other's container names as hostnames. In this scenario, the PHP container can establish a connection to the MySQL container using the following code:

<code class="php">$mysqli = new mysqli("mysql_container", "mattia", "prova", "prova");</code>

By leveraging user-defined networks, you can achieve seamless container-to-container communication without relying on IP addresses, improving flexibility and simplifying configuration in your Docker environment.

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