How to use custom name in docker overlay network for containers network name?

Question

When we set an overlay network, we can use containers names to resolve container addresses. That works fine.

Can I use some other, custom network name?

For example, if my container name is foo, can I resolve it in my overlay network by bar?

Answer 1

Yes you can, with the option --net-alias (network-scoped alias for the container, proposal 18699):

docker run -itd --name foo --net-alias=bar --net mynetwork busybox

Any other container on the same network will be able to ping bar (which references foo)