How do Docker containers communicate with each other?

There are several ways for Docker containers to communicate with each other.

1. Access using container names: Docker assigns a unique name to each container, which can be used to directly access the container. For example, if there is a container named app1, you can use app1 as the hostname or DNS name to access it from another container.
2. Accessing with container IP address: Each container has a unique IP address that can be used to directly access the container. Use the command docker inspect to find the IP address of the container.
3. Accessing Docker network: Docker offers various network drivers for creating custom networks to connect containers. By connecting multiple containers to the same network, they can communicate directly using container names or IP addresses. You can create a network using the docker network create command and connect containers to that network.
4. Access using Docker Compose: Docker Compose is a tool used for defining and running multiple containers, where the network connections between containers can be defined by writing a docker-compose.yml file. In this file, container names can be used to specify communication between containers. Then, the containers can be started using the docker-compose up command.

These methods can all be used to communicate and access between Docker containers. The specific method to use depends on your specific needs and environment setup.