Docker how to get container information from within the container

Question

I would like to make my docker containers aware of their configuration, the same way you can get information about EC2 instances through metadata.

how can I get the external IP of the docker host (other than accessing the EC2 metadata, which is specific to AWS)

Answer 1

I've found out that the container id can be found in /proc/self/cgroup

So you can get the id with :

cat /proc/self/cgroup | grep -o  -e "docker-.*.scope" | head -n 1 | sed "s/docker-\(.*\).scope/\\1/"