Docker goodies
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Copy a file from a container to the host system
docker cp <containerId>:/file/path/within/container /host/path/target
Attach to a running container
- http://askubuntu.com/questions/505506/how-to-get-bash-or-ssh-into-a-running-container-in-background-mode
- http://askubuntu.com/a/507009/129227
docker exec -it $containername /bin/bash
Remove untagged docker images
http://stackoverflow.com/a/28377696/1497139
docker rmi -f $(docker images -f "dangling=true" -q)
get logs of a container
docker logs $containername
remove old unused docker containers
docker ps -a | grep 'weeks ago' | awk '{print $1}' | xargs --no-run-if-empty docker rm
Support for build env variables
Upcoming feature in 1.9?