Jenkins and docker: uri was not specified

Solution 1:

With jenkins version of 2.51 and docker version 1.13.1, you can do the following to solve this issue. First add the following to the ExecStart (in docker.service):

ExecStart=/usr/bin/dockerd -H tcp://127.0.0.1:4243 -H unix:///var/run/docker.sock

And then go to Jenkins -> Manage Jenkins -> Configure system -> Docker builder. Here you specify:

tcp://127.0.0.1:4243

as Docker URL. Apply and Test connection.

Solution 2:

Docker-build-step plugin doesn't use local docker installation automatically.

* You have to configure it manually *

As mentioned in some other answers you don't need to do the voodoo of enabling tcp for docker endpoint you can simply use the socket path.

In Manage Jenkins/Configure System/Docker Builder You will see that the Docker URL option is left blank. Fill it with the unix socket url unix:///var/run/docker.sock. That should solve the issue.