/var/lib/docker/

docker info | grep Dir

/var/lib/
/var/lib/docker/builder/
/var/lib/docker/buildkit/
/var/lib/docker/containers/
/var/lib/docker/image/
/var/lib/docker/network/
/var/lib/docker/overlay2/
/var/lib/docker/plugins/
/var/lib/docker/runtimes/
/var/lib/docker/swarm/
/var/lib/docker/tmp/
/var/lib/docker/trust/
/var/lib/docker/volumes/

/var/lib/docker/containers/[hash_of_the_container]/hostconfig.json 

Configured in: /etc/docker/daemon.json

Related terms

• docker system df
• docker info
• /bin/truncate -s 0 /var/lib/docker/containers/*/*-json.log

See also

• Docker: dockerd, docker (command), dockerd-ce (dockerd), docker-proxy, Docker Kubernetes Service (DKS), /var/lib/docker/, /var/run/docker.sock, 9323
• Docker: docker info docker stats, /var/lib/docker/

https://stackoverflow.com/questions/19335444/how-do-i-assign-a-port-mapping-to-an-existing-docker-container?rq=1