Docker Cheat Sheet
Docker & Programming tools

Docker Cheat Sheet

November 5, 2017

Here we go… my second docker¬†related post. I am quite in love with it, so expect some more stuff about it ūüôā I will put down some of the Docker Cheat Sheet command, that I use on the daily base when working with Docker. If you think, I should include some of yours¬†Docker Cheat Sheet, don’t hesitate and paste them into the comment area below.

Docker Cheat Sheet commands

Display running Docker containers:

To retrieve the list of currently running containers, we can use:

docker ps -a

Result will be something like that

CONTAINER ID        IMAGE                                COMMAND                  CREATED             STATUS                           PORTS                           NAMES
1aedf69cdb86        mageinferno/magento2-nginx:1.11-1    "/usr/local/bin/st..."   5 hours ago         Exited (255) About an hour ago   443/tcp,>80/tcp   mageattachment_app_1
7829a01b3650        mageinferno/magento2-php:7.0-fpm-1   "docker-php-entryp..."   5 hours ago         Exited (255) About an hour ago   9000/tcp                        mageattachment_phpfpm_1
04bf83cd6795        percona:5.7                          "docker-entrypoint..."   5 hours ago         Exited (255) About an hour ago>3306/tcp          mageattachment_db_1
Stop and remove running Docker containers

Ok, we have a list of running containers. When switching from project to project I usually stop and remove the running containers to start clean. Here is how I do it:

//stopping all the running containers
docker stop $(docker ps -a -q)
//removeing all containers
docker rm $(docker ps -a -q)
Deleting Docker images:

What about images… sometimes we need to delete those to. First we can retrieve the list of available images with:

docker images -a

Example of the result:

REPOSITORY                   TAG                 IMAGE ID            CREATED             SIZE
percona                      5.7                 742e34741b00        11 days ago         394MB
wordpress                    latest              d3f0cddf9493        3 weeks ago         408MB
mysql                        5.7                 3e3878acd190        3 weeks ago         412MB
phpmyadmin/phpmyadmin        latest              3405a88394e3        2 months ago        111MB
mageinferno/magento2-php     7.0-fpm-1           2444719145be        9 months ago        590MB
mageinferno/magento2-nginx   1.11-1              593fd7e2ce1e        9 months ago        182MB

To delete an image we need to specify it’s ID.¬†For example (deleting image mageinferno/magento2-nginx):

docker rmi 593fd7e2ce1e
Re-build-ing Docker images:

If you have modified files like dockerfile, .env, you should re-build the image, for changes to take effect:

docker-compose build --no-cache
Deleting Docker volumes:

Let’s say we have the following volumens


Those can be displayed with the following command:

docker volume ls -q

If we would like to delete volumes that are related to the image magetest the we can do this with:

docker volume rm $(docker volume ls -q | egrep 'magetest')

Or if we want to delete those volumes that are not related to the image magetest (just apply the regexp that suits your needs):

docker volume rm $(docker volume ls -q | egrep -v 'magetest')
Enter into Docker container (bash):

You can easily connect into the¬†running container¬†(let’s say you kind of can SSH into it). First retrieve the container ID:

docker ps -a

After that enter the following command:

docker exec -i -t [container ID] bash

I often use the following shortcut

docker exec -it $(docker ps -f name=php -q) bash

This will connect you to the container with the image name that contains the strinh ‘php’.
So, here we go… you are now logged into the container shell. At this point, you may ask: “How can I transfer files from container into the local machine?”. Ok, for that we don’t need to be logged into the running container. Just use thi command:

docker cp [container ID]:/var/www/html.tar.gz ./html.tar.gz

That’s all for now. The cheat sheet will be updated as I will dive deeper in Docker…. so, stay tuned ūüėČ

Other Docker cheat sheet lists

  2. wsargent

Setting up Docker development environment

Want to apply those learned Docker Cheat Sheet on your docker docker develoment environment containers? Here are some of my post to setup a Docker development environment

  1. Docker Magento 2
  2. Docker WordPress



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