How to connect two Docker containers into one network on the same host?

To connect two Docker containers into a single network on the same host, you need to create a custom Docker network and run the containers within this network. This allows the containers to communicate with each other by container names.

Example:

1. Create a network:

docker network create my_network

2. Run the containers, connecting them to the network:

docker run -d --name container1 --network my_network image1

docker run -d --name container2 --network my_network image2

Now, the containers can refer to each other by the names container1 and container2 within the my_network network.

This is convenient for microservices when internal communication needs to be ensured without exposing ports externally.