Docker

Docker basics

We have already learned how to download Docker images using the «docker pull» command and how to create a container using the «docker run» command. We will now learn about other basic Docker commands. We can use the «docker ps» command to see all the containers in our machine:

sudo docker ps -a

We should be able to see the Postgres container running.

Output of the docker pa -a command

Each container and image has an associated ID that looks like the following:

c6f7dfc1a4c8

We can use the following command to stop a running Docker container:

sudo docker stop INSERT_CONTAINER_ID_HERE
sudo docker stop c6f7dfc1a4c8

Similarly, we can run a Docker container using the start command:

sudo docker start c6f7dfc1a4c8

Please note that the run command is used to create a new Docker container while the start command is used to run an existingDocker container given its ID.

We can use the following command to remove a Docker container:

sudo docker rm c6f7dfc1a4c8

Please note that before you can remove a Docker container, you must stop it. The following command can be used to remove aDocker image:

sudo docker rmi INSERT_IMAGE_ID_HERE

Please note that before you can remove a Docker image, you must stop and remove all its associated containers.