I am running Jenkins and Docker on a CentOS machine. I have a Jenkins job that pulls a Github repo and builds a Docker image. When I try running the job I get the error:
+ docker build -t myProject .
Cannot connect to the Docker daemon. Is the docker daemon running on this host?
Build step 'Execute shell' marked build as failure
Finished: FAILURE
This problem occurs even though I have added jenkins to my docker usergroup via sudo usermod -aG docker jenkins and restarted my machine. How do I fix this?
By the way, if try changing the command to sudo docker build -t myProject . I just get the error sudo: sorry, you must have a tty to run sudo
After the installation of Jenkins and Docker. Add jenkins user to dockergroup (like you did)
sudo gpasswd -a jenkins docker
Edit the following file
vi /usr/lib/systemd/system/docker.service
And edit this rule to expose the API :
ExecStart=/usr/bin/docker daemon -H unix:// -H tcp://localhost:2375
Do not create a new line with ExecStart, simply add the commands at the end of the existing line.
Now it's time to reload and restart your Docker daemon
systemctl daemon-reload
systemctl restart docker
Then restart jenkins, you should be able to perform docker commands as jenkins user in your jenkins jobs
sudo service jenkins restart