Is there a way to add a hostname to an EXISTING docker container?

Question

I have some containers that communicate via their IP from the network docker.

I can use the option -h or --hostname when running a new container but I want to set the hostname for existing container.

Is it possible?

Answer 1

One way is to create network and add different container in this network. When adding container in the network, you can use the --alias option of docker network. Like this:

• Create a network:

  docker network create <my-network-name> 
  

• Add containers in the network:

  docker network connect --alias <hostname-container-1> <my-network-name> <container-1>
  docker network connect --alias <hostname-container-2> <my-network-name> <container-2>
  docker network connect --alias <hostname-container-3> <my-network-name> <container-3>
  

• Enjoy.

So each container can see other container by the alias (the alias is used as hostname).