- Intrudaction:
- What is Docker?
- What is a container platform?
- Want to improve this cheat sheet?
- General:
Docker is the company driving the container movement and the only container platform provider to address every application across the hybrid cloud.
A container platform is a complete solution that allows organizations to solve multiple problems across a diverse set of requirements.
See the Contributing section!
| Task | Command Line |
|---|---|
| Change entrypoint to run nothing | entrypoint: ["tail", "-f", "/dev/null"] |
| Change restart policy | restart: always [https://docs.docker.com/compose/compose-file/compose-file-v2/=restart][link] |
| Mount file as volume | $PWD/httpd/httpd.conf:/usr/local/apache2/conf/httpd.conf:ro [samples/mount_file.yml][samples/mount_file.yml] |
| Start compose env | docker-compose up, docker-compose up -d |
| Stop compose env | docker-compose down, docker-compose down -v |
| Check logs | docker-compose logs |
| Task | Command Line |
|---|---|
| Tail container logs | docker logs --tail 5 $container_name |
| Check container healthcheck status | docker inspect --format '{{.State.Health}}' $container_name |
| Task | Command Line |
|---|---|
| Create docker image | javascript docker build -t imgname . |
| Start docker container | docker run -p 4000:80 imgname |
| Start docker container in detached mode | docker run -d -p 4000:80 imgname |
| Enter a running container | docker exec -it [container-id] sh |
| List containers | docker ps |
| List all containers | docker ps -a |
| List containers by labels | docker ps --filter "label=org.label-schema.group" |
| Stop container | docker stop <hash> |
| Remove container | docker rm <hash> |
| Remove all containers | docker rm $(docker ps -a -q) |
| Force shutdown of one given container | docker kill <hash> |
| List all images | docker images -a |
| Login to docker hub | docker login |
| Tag |
docker tag <image> username/repo:tag |
| Docker push a tagged image to repo | docker push username/repo:tag |
| Run image from a given tag | docker run username/repo:tag |
| Task | Command Line |
|---|---|
| Remove the specified image | docker rmi <imagename> |
| Remove all docker images | docker rmi $(docker images -q) |
| Remove orphaned docker volumes | docker volume rm $(docker volume ls -qf dangling=true) |
| Remove dead containers | docker rm $(docker ps --filter status=dead -qa) |
Docker provides a single command that will clean up any resources — images, containers, volumes, and networks — that are dangling (not associated with a container):
| Task | Command Line |
|---|---|
| Clean up any resources — images, containers, volumes, and networks — that are dangling | docker system prune |
| Remove any stopped containers and all unused images (not just dangling images) | docker system prune -a |
| Remove one or more specific images |
$### Remove one or more specific images:
Use the docker images command with the -a flag to locate the ID of the images you want to remove. This will show you every image, including intermediate image layers. When you've located the images you want to delete, you can pass their ID or tag to docker rmi:
| Task | Command Line |
|---|---|
| List | docker images -a |
| Remove | docker rmi IMAGE [IMAGE...] |
``
Docker images consist of multiple layers. Dangling images are layers that have no relationship to any tagged images. They no longer serve a purpose and consume disk space. They can be located by adding the filter flag, -f with a value of dangling=true to the docker images command. When you're sure you want to delete them, you can use the docker images purge command:
Note: If you build an image without tagging it, the image will appear on the list of dangling images because it has no association with a tagged image. You can avoid this situation by providing a tag when you build, and you can retroactively tag an images with the docker tag command.
List:
docker images -f dangling=true
Remove:
docker images purge
You can find all the images that match a pattern using a combination of docker images and grep. Once you're satisfied, you can delete them by using awk to pass the IDs to docker rmi. Note that these utilities are not supplied by Docker and are not necessarily available on all systems:
List:
docker images -a | grep "pattern"
Remove:
docker images -a | grep "pattern" | awk '{print $3}' | xargs docker rmi
All the Docker images on a system can be listed by adding -a to the docker images command. Once you're sure you want to delete them all, you can add the -q flag to pass the Image ID to docker rmi:
List:
docker images -a
Remove:
docker rmi $(docker images -a -q)
Docker provides a single command that will clean up any resources — images, containers, volumes, and networks — that are dangling (not associated with a container):
docker system prune
To additionally remove any stopped containers and all unused images (not just dangling images), add the -a flag to the command:
docker system prune -a
Use the docker images command with the -a flag to locate the ID of the images you want to remove. This will show you every image, including intermediate image layers. When you've located the images you want to delete, you can pass their ID or tag to docker rmi:
List:
docker images -a
Remove:
docker rmi IMAGE [IMAGE...]
Docker images consist of multiple layers. Dangling images are layers that have no relationship to any tagged images. They no longer serve a purpose and consume disk space. They can be located by adding the filter flag, -f with a value of dangling=true to the docker images command. When you're sure you want to delete them, you can use the docker images purge command:
Note: If you build an image without tagging it, the image will appear on the list of dangling images because it has no association with a tagged image. You can avoid this situation by providing a tag when you build, and you can retroactively tag an images with the docker tag command.
List:
docker images -f dangling=true
Remove:
docker images purge
You can find all the images that match a pattern using a combination of docker images and grep. Once you're satisfied, you can delete them by using awk to pass the IDs to docker rmi. Note that these utilities are not supplied by Docker and are not necessarily available on all systems:
List:
docker images -a | grep "pattern"
Remove:
docker images -a | grep "pattern" | awk '{print $3}' | xargs docker rmi
All the Docker images on a system can be listed by adding -a to the docker images command. Once you're sure you want to delete them all, you can add the -q flag to pass the Image ID to docker rmi:
List:
docker images -a
Remove:
docker rmi $(docker images -a -q)
In the last year, we had different projects in complex environments and changing frequently. While the deployment was on cloud-based platforms such as Google Cloud and Amazon AWS, the developers had to use a Mac, Linux and Windows platform.
We had to switch between development in the office, to implementation at the client site from Migration of enterprise applications, web development, e-commerce, and a lot of python scripting.
Docker helped us to keep focusing on the tasks while the system deployment handled through a script.
We search for countless places to find the right document to maintain each project.
This repository is a result of those projects. With samples and step by step examples.
Incomplete list:
- digitalocean
- https://github.com/juliogomez/docker_cheatsheet
- https://github.com/wsargent/docker-cheat-sheet/blob/master/README.md
- https://github.com/tchapi/markdown-cheatsheet
- https://github.com/dennyzhang/cheatsheet-docker-A4
- https://github.com/daten-und-bass/docker-cheat-sheet
- https://github.com/dimonomid/docker-quick-ref
- http://dockerlux.github.io/pdf/cheat-sheet-v2.pdf
Reference documentation: https://docs.docker.com/reference/
License: Code is licensed under [License]
@ShmuelMaruani, @LimitlessVirtue, @limitlessv