docker.md

Docker Cheatsheet

Deploying

Redeploying a container

docker pull mysql
docker stop my-mysql-container
docker rm my-mysql-container
docker run --name=my-mysql-container --restart=always \
  -e MYSQL_ROOT_PASSWORD=mypwd -v /my/data/dir:/var/lib/mysql -d mysql

Networking

Connect to host http://host.docker.internal

Troubleshooting

View logs for last 500 lines and follow docker logs -f --tail=500 <container name>

SSH into container docker exec -it <container name> /bin/bash

Bring up docker image that will remove its self upon exiting shell docker run --rm -it ubuntu:16.04 bash -l

Cleaning up after docker

Found this info in a great blog post

Assess the situation

• df -h
• docker ps
• docker images

Generally safe cleanup commands

• docker volume rm $(docker volume ls -qf dangling=true) delete orphaned and dangling volumes
• docker rmi $(docker images -q -f dangling=true) delete dangling and untagged images

Cleanup commands

• docker rm $(docker ps -aqf status=exited) delete exited containers
• docker rmi $(docker images -q) delete all images
• docker kill $(docker ps -q) kill all running containers
• docker rm $(docker ps -aq) delete all running containers

Official Docker cleanup method

• docker system prune -a

Can't run a command?

• sudo usermod -aG docker $USER

Set up a cronjob!

Run this script in a cron job

#!/bin/bash
docker rmi $(docker images -q -f dangling=true)
docker volume rm $(docker volume ls -qf dangling=true)

cron job: 15 0 * * 1 ~/docker-cleanup.sh > /dev/null 2>&1