This message is extracted from a ticket originally emailed to support@gruntwork.io. Names and URLs have been removed where appropriate.
I’m currently trying to setup the CI using Jenkins. Unfortunately, when I
try to build a Docker image, there is not enough space on the instance
Jenkins is running on.
After small investigation, I found out that Docker build his images using
temporary files stored in the /var/lib/docker folder.
Thank you for all the background details and your own investigations! As you suggested in your own ticket, I believe we can solve this by changing the path Docker uses for temporary storage while building images. To accomplish that, you can update the Docker Daemon’s configuration by modifying the data-root property. The Docker Daemon is the service that executes Docker and which sets all the global defaults that Docker uses when building images, running containers, or doing just about anything else. Per the Docker Daemon docs, here is the official explanation of the data-root property:
–data-root is the path where persisted data such as images, volumes, and cluster state are stored. The default value is /var/lib/docker. To avoid any conflict with other daemons, set this parameter separately for each daemon.
You can update this setting either by passing the --data-root option to the dockerd binary (the Docker Daemon binary) when it loads on your server, or by updating the Docker Daemon configuration file, which by default lives at /etc/docker/daemon.json. In that file, look for the data-root property.
I’m not sure how you’ve configured Docker on your Jenkins box, so I can’t be more specific than that right now, but I think your best option is to update the /etc/docker/daemon.json file and then reboot the Docker daemon. If you run into any challenges getting this configured, please let me know and we’d be happy to provide additional support!
