Docker: tcpSlaveAgentListener not found

[ozbillwang]

Issues and Contributing

Docker commands that you execute

copy the command from README and run it on my laptop

docker run -d -v jenkins_home:/var/jenkins_home -p 8080:8080 -p 50000:50000 jenkins/jenkins:lts

Actual result

it runs fine, I can login, and also confirm I have enabled the jnlp port

So I can make sure the port 50000 is actived

$ curl localhost:50000
Jenkins-Agent-Protocols: JNLP4-connect, Ping
Jenkins-Version: 2.150.1
Jenkins-Session: a693c836
Client: 172.17.0.1
Server: 172.17.0.2
Remoting-Minimum-Version: 3.4

but when connect with jnlp slave (container is jenkins/jnlp-slave), I got exact same error described in https://issues.jenkins-ci.org/browse/JENKINS-28499

tcpSlaveAgentListener not found

the test:

$ curl localhost:50000/tcpSlaveAgentListener/
Not Found

Expected outcome

register slaves to jenkins master

Have you tried a non-dockerized Jenkins and get the expected outcome?

Seems there are some issues reported with https://issues.jenkins-ci.org/browse/JENKINS-28499 for same issue

Output of docker version

$ docker version
Client: Docker Engine - Community
 Version:           18.09.0
 API version:       1.39
 Go version:        go1.10.4
 Git commit:        4d60db4
 Built:             Wed Nov  7 00:47:43 2018
 OS/Arch:           darwin/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.0
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.4
  Git commit:       4d60db4
  Built:            Wed Nov  7 00:55:00 2018
  OS/Arch:          linux/amd64
  Experimental:     true

Other relevant information

[carlossg]

you are hitting the wrong port, try

localhost:8080/tcpSlaveAgentListener/

[ozbillwang]

Thanks, @carlossg

I do get response from localhost:8080/tcpSlaveAgentListener/

That confused me. what the port 50000 (jnlp) used for? My understanding is, port 50000 is used for slaves to connect to master, isn't it?

[Cody0713]

@ozbillwang https://stackoverflow.com/questions/58719522/tcpslaveagentlistener-is-invalid-404-not-found/59616476#59616476 check out my comment here

Anyone looking for the real explanation for this... You must configure a different port for jnlp i.e. 50000. The catch is that you need to provide the JENKINS_URL=http://jenkins:8080 and JENKINS_TUNNEL=jenkins:50000. If you try to hit 50000 on both the URL and TUNNEL you will get the error of 50000/tcpSlaveAgentListener invalid 404 not found. If you try to hit 8080 on both URL AND TUNNEL you will get an error like "Incorrect acknowledgement sequence, expected 0x000341434b got 0x485454502f". I hope this saves someone time

{ "name": "JENKINS_URL", "value": "http://<jenkins>:8080" }, { "name": "JENKINS_TUNNEL", "value": "<jenkins>:50000" },