How to add containers to same network in Docker

First, define your user-defined bridge network:

docker network create your-network-name

Then, connect your containers to the network that you just created:

docker network connect your-network-name container-name

Or connect with the run command:

docker run --network=your-network-name your-image

Now, containers in the same network your-network-name can talk to each others via container name.