How to solve Docker permission error when trigger by Jenkins

Question

My Jenkins is not run in Docker container, just tradional install to VPS. I got the following error when executing a simple test project. I am using Ubuntu 14, java 7, and s

Answer 1

In your VPS server terminal, do this to add your jenkins user to the docker group:

sudo usermod -aG docker jenkins

Then restart your jenkins server to refresh the group.

Take into account any security issue that this could produce:

Warning: The docker group grants privileges equivalent to the root user. For details on how this impacts security in your system, see Docker Daemon Attack Surface.

Refer to the docs

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Edit (mentioned by @iger): Just make sure to restart the Jenkins from command-line (i.e. sudo service jenkins restart), but not through the rest endpoint (http:///restart)

Answer 2

1. Add user to docker group as it described here.
2. Start jenkins with this command: docker run -d -u root --restart on-failure -p "8080:8080" -p "50000:50000" -v $PWD/jenkins-data:/var/jenkins_home -v /var/run/docker.sock:/var/run/docker.sock jenkinsci/blueocean

root user required because without it you will not be able to execute root task, example: apk update && apk install ...

Answer 3

Running

sudo usermod -aG docker jenkins

and then

sudo service jenkins restart

worked perfectly for me.