Welcome to ROSMASTER M1 repository

Docker basic commands

1. Not using sudo commands

Normally, Docker commands require prefixing with sudo, as shown below:

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sudo docker version

However, after adding the docker group, you no longer need to prefix commands with sudo. To add the docker group (run the command on the host running Docker):

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sudo groupadd docker # Add the docker group
sudo gpasswd -a $USER docker # Add the current user to the docker group. $USER is automatically resolved to the currently logged-in user.
newgrp docker # Update the docker group

After adding the above commands, test the command using the [docker images] command. If no errors are reported, you can now use the command without sudo. If the following error is reported:

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pi@ubuntu:~$ docker images
WARNING: Error loading config file: /home/pi/.docker/config.json: open /home/pi/.docker/config.json: permission denied

Then execute the following command on the host machine to resolve the issue:

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sudo chown "$USER":"$USER" /home/"$USER"/.docker -R
sudo chmod g+rwx "/home/$USER/.docker" -R

2. Basic Docker Commands

1. Downloading the Image

⚠️If you cannot pull the image, you will need to use a secure internet connection.

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docker pull

2. List images

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docker images

Parameter explanation:

REPOSITORY: The repository of the image

TAG: The image tag IMAGE

ID: The image ID CREATED

TED: The time the image was created

SIZE: The size of the image

3. List currently running Docker images

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docker ps # List running containers
docker ps -a #List all running containers

If it is, it means to list all the docker images that have been run

Up indicates a running container, and Exited indicates a closed Docker container.

4. Exit a container using the exit command

5. Restart a closed Docker container

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docker start (container id or container name) # Start a container
docker restart (container id or container name) # Restart a container
docker stop (container id or container name) # Stop the container
docker kill (container id or container name) # Forcefully stop the container

6. Deleting a container

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docker rm container id # Delete a specific container
docker rm -f $(docker ps -a -q) # Delete all containers
docker ps -a -q | xargs docker rm # Delete all containers