Running Jenkins in Docker and using docker-plugin for create slaves

I’m running Jenkins on Docker, and i’m trying to use docker plugin to create slaves containers at the same host as jenkins master.

Since the docker plugin i can connect to the cloud using unix:///var/run/docker.sock as Docker url, when i hit in “Test connection” button, connects correctly.

The problem is when i try to run a job, the slave is created but jenkins says “All nodes labeled ‘jenkins_slave’ are offline”, this are logs error from the slave:

[10/28/16 10:36:27] [SSH] Opening SSH connection to 0.0.0.0:32936.
Connection refused
SSH Connection failed with IOException: "Connection refused".
java.io.IOException: There was a problem while connecting to 0.0.0.0:32936
    at com.trilead.ssh2.Connection.connect(Connection.java:818)
    at com.trilead.ssh2.Connection.connect(Connection.java:687)
    at com.trilead.ssh2.Connection.connect(Connection.java:587)
    at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1185)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:711)
    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:706)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.net.ConnectException: Connection refused
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:204)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at com.trilead.ssh2.transport.TransportManager.establishConnection(TransportManager.java:354)
    at com.trilead.ssh2.transport.TransportManager.initialize(TransportManager.java:467)
    at com.trilead.ssh2.Connection.connect(Connection.java:758)
    ... 9 more
[10/28/16 10:36:27] Launch failed - cleaning up connection
[10/28/16 10:36:27] [SSH] Connection closed

My docker version is:

Client:
 Version:      1.12.2
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   bb80604
 Built:        Tue Oct 11 18:29:41 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.12.2
 API version:  1.24
 Go version:   go1.6.3
 Git commit:   bb80604
 Built:        Tue Oct 11 18:29:41 2016
 OS/Arch:      linux/amd64

Thanks in advance for any help, i had spent more than 3 day trying to solve this.

[jaydp17]

any update on this? I’m also facing the same issue. @Modomu did you get a solution?

[martinheg]

@jaydp17 @njtman I have the same setup as described here and had the same issue, but setting the ‘Docker Hostname’ value in the Cloud settings (under Advanced) resolved it for me.

• Jenkins: 2.85
• docker-plugin 1.0.1