Welcome to ROSMASTER A1 PRO repository

Basic Docker Commands

1. Working Without the sudo Command

Normally, when operating Docker, the sudo prefix must be added, as shown below:

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sudo docker version

However, after adding a docker user group, the sudo prefix is no longer needed. The way to add the docker user group (run the commands on the host that runs Docker):

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sudo groupadd docker          # create a docker user group
sudo gpasswd -a $USER docker  # add the current user to the docker user group, where $USER is automatically resolved to the currently logged-in user
newgrp docker                 # update the docker user group

After running the above commands, test with the docker images command. If no error is reported, it means you can now use Docker without sudo. If an error like the following appears:

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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 run the following commands on the host to resolve it:

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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. Pull an Image

⚠️ If the image cannot be pulled, you may need to access the internet through a VPN.

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docker pull

2. List Images

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docker images 

Parameter explanation:

REPOSITORY — the repository source of the image

TAG — the tag of the image

IMAGE ID — the ID of the image

CREATED — the time when the image was created

SIZE — the size of the image

3. List the Docker Containers That Are Currently Running or Have Been Run

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docker ps #list running containers
docker ps -a  #list all containers that have ever been run

The figure below shows a list of all the Docker containers that have ever been run.

In the figure, Up indicates a running container, and Exited indicates a Docker container that has been stopped.

4. Exit a Container Using the exit Command

5. Restart a Docker Container That Has Been Stopped

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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 a container
docker kill (container id or container name)    # force-stop a container

6. Delete Containers

docker rm container id  # delete the specified container
docker rm -f $(docker ps -a -q)   # delete all containers
docker ps -a -q|xargs docker rm   # delete all containers