Docker

Commands

basic:

• build an image from Dockerfile: docker build -t <tag> .
• run a container from image: docker run -d --name <name> <tag>
• save container as an image: docker commit <container> <tag>
• save image as tar: docker save <tag> > /path/file.tar
• load from tar: docker load -i /path/file.tar
• tag an image: docker tag <image> <tag>
• stop container: docker stop <name>
• start container and attach to it: docker start -ai <name>
• detach from container: ctrl-p ctrl-q

clean up containers:

docker ps -a -q | xargs -n 1 -I {} docker rm {}

clean up images:

docker rmi $( docker images | grep '<none>' | tr -s ' ' | cut -d ' ' -f 3)

from 1.3:

docker exec [container] [command]

from 1.4:

docker cp [container]:[path] [local-path]

Dockerfiles

always use dockerfile to build images, the build cache is very useful and super easy to make changes.

No Supervisord

each service should be in a standalone container, single responsibility principle.

Tips

• use docker virtual interface ip to access host (ip addr show docker0)
• when using ufw, make sure to bind host port with explicit ip address (-p 172.17.42.1:3000:3000)
• since v1.2.0, use --restart flag to specify a restart policy (run --restart=always)