Quick how-to about Docker commands.

Getting Docker container IP

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name_or_id

Getting Docker container variable value

docker exec <container_id> bash -c 'echo "$ENV_VAR"'

Saving Docker image on hard disk drive

docker save myimage:version | gzip > myimage_version.tar.gz

Loading Docker images from archive

docker load -i myimage_version.tar.gz

Pushing image from local Docker registry to another registry

Very useful when deploying IBM FileNet on OpenShift, by the way 😉 Maybe on another post 🙂

docker tag myimage:version <remote-registry-dns-or-ip>:<remote-registry-port>/<namespace>/myimage:version
docker push <remote-registry-dns-or-ip>:<remote-registry-port>/<namespace>/myimage:version

And if you want to do it on OKD (“oc whoami -t” command will output the user password as a user token, “remote-registry-dns-or-ip” / “remote-registry-port” are usually “172.30.1.1” / “5000”

oc login -u <oc-username> -p <oc-password>
oc project <namespace>
docker login -u <oc-username> -p $(oc whoami -t) <remote-registry-dns-or-ip>:<remote-registry-port>
docker tag myimage:version <remote-registry-dns-or-ip>:<remote-registry-port>/<namespace>/myimage:version
docker push <remote-registry-dns-or-ip>:<remote-registry-port>/<namespace>/myimage:version
docker logout