Docker tips

tipsDocker.md

Docker tips

Links

• Cheat sheet

Commands

• To show only running containers use: docker ps
• To show all containers use: docker ps -a
• Delete container: docker rm -v container-id
• Lista images: docker images
• Remove image: docker rmi image-name
• Open a shell inside container: docker exec -it container_name_or_id /bin/bash
• Copy a file from container to host: docker cp <containerId>:/file/path/within/container /host/path/target
• Save image to tar file: docker save --output oel6-xe.tar oel6-xe
• Load image from tar: sudo docker load oel6-xe.tar
• Run container overwriting default command (CMD): docker run imagename echo "hello world"
• Rename a docker image tag: docker tag [image id] [repo:tag]

Build

• Tips for build smaller images
• Dockerizing an SSH daemon service
• Git strategies for docker

Dockerfile

• Enable sudo inside container: RUN apt-get -y install sudo
• Add user and group: RUN useradd -ms /bin/bash newuser

Images

• Installing Oracle XE in a Docker image
• Create Image for Oracle Database 12c using Puppet
• docker-node-oracle

Volumes

• Shellscript to delete orphaned docker volumes (docker >= 1.9)

Development environment

• Docker - Dev-in-a-box environment setup
• Dockerized Vagrant ¿working? example (from http://stackoverflow.com/q/28268864/840635)
• Slides

Composer examples

• How to use Docker Compose to run complex multi container apps on your Raspberry Pi

With nodejs

• Node.js, PM2, Docker & Docker-compose DevOps

FAQ

• What is the difference between CMD and ENTRYPOINT in a Dockerfile?
• Gotchas in Writing Dockerfile
• How to change the docker image installation directory?
  • Best way to move docker directory #3127
  • DOCKER_OPTS in /etc/default/docker ignored
• How to add a user
• How to get the ip address of the docker host from inside a docker container

Troubles

• “Is your docker daemon up and running?”

Tutorials and workshops

• Introduction to docker<--Cristal clear

Useful links

• Learn Docker
• Introductory video and slides
• 8 Protips to Start Killing It When Dockerizing Node.js
• Deploying Node.js Microservices to AWS using Docker
• An Exhaustive Guide to Writing Dockerfiles for Node.js Web Apps

zSnippetsDockers.md

Docker Snippets Useful snippets for cleanups etc.

Stop all containers

docker stop $(docker ps -a -q) docker ps -a -q | xargs docker stop

Remove all containers

docker rm $(docker ps -a -q) docker ps -a -q | xargs docker rm

Remove all images

docker rmi $(docker images -q) docker images -q | xargs docker rmi

Remove orphaned volumes

docker volume rm $(docker volume ls -qf dangling=true) docker volume ls -qf dangling=true | xargs docker volume rm

Remove exited containers

docker rm -v $(docker ps -a -q -f status=exited) docker ps -a -q -f status=exited | xargs docker rm -v

Stop & Remove all containers with base image name image_name

docker rm $(docker stop $(docker ps -a -q --filter ancestor=image_name)) docker ps -a -q --filter ancestor=image_name | xargs docker stop | xargs docker rm

Remove dangling images

docker rmi $(docker images -f "dangling=true" -q) docker images -f "dangling=true" -q | xargs docker rmi

Cleanup Volumes

docker run -v /var/run/docker.sock:/var/run/docker.sock \
           -v /var/lib/docker:/var/lib/docker \
           --rm martin/docker-cleanup-volumes

Remove all DinD containers

docker rm $(docker stop $(docker ps -a -q --filter ancestor=urbit/dind-jenkins))

Cleanup exited + orphaned + DinD

docker ps -a -q -f status=exited | xargs docker rm -v && \
docker volume ls -qf dangling=true | xargs docker volume rm && \
docker ps -a -q --filter ancestor=urbit/dind-jenkins | xargs docker stop | xargs docker rm

Docker-outside-of-Docker

docker run -d -v /var/run/docker.sock:/var/run/docker.sock \
              -v $(which docker):/usr/bin/docker -p 8080:8080 my-dood-container

Docker-inside-Docker

docker run --privileged --name my-dind-container -d docker:dind docker run --privileged --name my-dind-container -d urbit/dind-jenkins:latest