How to get the IP address of the docker host from inside a docker container

Question

As the title says. I need to be able to retrieve the IP address the docker hosts and the portmaps from the host to the container, and doing that inside of the container.

Answer 1

On Ubuntu, hostname command can be used with the following options:

• -i, --ip-address addresses for the host name
• -I, --all-ip-addresses all addresses for the host

For example:

$ hostname -i
172.17.0.2

To assign to the variable, the following one-liner can be used:

IP=$(hostname -i)