In a recent TechRepublic video, Jack Wallen shows how to enable the Docker checkpoint feature to take snapshots of your running containers to save a state for backup or later usage. The following is an edited transcript of his tutorial.
First, you must add the repository for the CRIU package with the following command: SUDU add-apt-repository ppa:criu/ppa.
Update APT with this command: sudo apt-get update.
Then install CRIU with this command: sudo apt-get install criu -y.
Next, we must enable Docker experimental features.
First, create a new file with the command sudo nano /etc/docker/daemon.json.
In that file, add the following: {"Experimental": true}. Save and close the file.
Restart the Docker Daemon with sudo systemctl restart docker.
Deploy an NGINX container with the command docker run --name nginx-checkpoint -p 8005:80 -d nginx.
Create the checkpoint with this command: docker checkpoint create --leave-running=true nginx-checkpoint checkpoint.
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If you are interested in learning more about Docker, you can check out the following resources in TechRepublic Academy:
Hacking and Securing Docker Containers
Linux and Docker Coding Bundle
Docker and Kubernetes mini-bundle