Docker Container Get IP Address from host interfaces

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Not that I am aware of. The best option is for your application to have a “REST” API that could receive the updated IP addresses from.

Another possibility is to run docker inside your application docker container and then run a container on the docker node to display the IP addresses. You would have to pass the /var/run/docker.sock to your application container too via --volume /var/run/docker.sock:/var/run/docker.sock

Example:

root@manager:~# docker container run -it -p 80:80 --mount type=bind,source="$(pwd)",target=/my_ips --volume /var/run/docker.sock:/var/run/docker.sock ubuntu:latest sh

Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
38e2e6cd5626: Pull complete
705054bc3f5b: Pull complete
c7051e069564: Pull complete
7308e914506c: Pull complete
Digest: sha256:945039273a7b927869a07b375dc3148de16865de44dec8398672977e050a072e
Status: Downloaded newer image for ubuntu:latest

Now inside the container install Docker

# apt-get update -qq && apt-get install curl -y && curl --silent -SL https://get.docker.com/ | sh
--- left out the output of these commands ---

Then you can run a container on the docker host from the application container and display the IPs

# docker run -i --rm --network host ubuntu:latest hostname -I
10.0.2.15 172.28.128.3 172.17.0.1 172.18.0.1
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