networking - Docker : How to find the network my container is in?

Question

I am trying to understand few things about Docker:

1. How can I find the network my container is in ?
2. Can I dynamically detach my container and attach on an other network ? How?
3. If I have two containers running, how to check if the two are in the same network ? Can I ping one from other ?

Answer 1

To see what network(s) your container is on, assuming your container is called c1:

$ docker inspect c1 -f "{{json .NetworkSettings.Networks }}"

To disconnect your container from the first network (assuming your first network is called test-net):

$ docker network disconnect test-net c1

Then to reconnect it to another network (assuming it's called test-net-2):

$ docker network connect test-net-2 c1

To check if two containers (or more) are on a network together:

$ docker network inspect test-net -f "{{json .Containers }}"