User-defined networks

You can create custom, user-defined networks, and connect multiple containers to the same network. Once connected to a user-defined network, containers can communicate with each other using container IP addresses or container names.

The following example creates a network using the bridge network driver:

$ docker network create -d bridge my-net

Running a container in the created network:

$ docker run --network=my-net -itd --name=container3 busybox

👉 Container networks

In addition to user-defined networks, you can attach a container to another container’s networking stack directly, using the --network container:<name|id> flag format.

The following flags aren’t supported for containers using the container: networking mode:

• --add-host
• --hostname
• --dns
• --dns-search
• --dns-option
• --mac-address
• --publish
• --publish-all
• --expose

👉 Published ports

By default, when you create or run a container using docker create or docker run, the container doesn't expose any…