Jenkins master migration from Windows to Linux

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D'raj

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Apr 23, 2020, 3:52:07 AM4/23/20
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Hello All,
I recently migration Jenkins master from Windows to Linux(Centos). The migration is successful.
I installed Jenkins on Linux and copied all the directories from Windows to Linux.
LDAP is set. i can login and see the jobs.

The problem is I cannot execute and test jobs as the build hosts are offline. How do I configure old build hosts to talk to new linux Jenkins instance?
Is there a way to check if migration is successful, without running and testing each and every job in the system.


Thank You!!

Dirk Heinrichs

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Apr 23, 2020, 4:58:42 AM4/23/20
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Am Mittwoch, den 22.04.2020, 23:52 -0700 schrieb D'raj:

How do I configure old build hosts to talk to new linux Jenkins instance?

That largely depends on how they have been connected. Are they connected via SSH Slave plugin, Swarm Slave plugin or via JNLP? If SSH or JNLP, the connection is initiated from the master, while in case of Swarm Slaves the connection is initiated from the nodes.

HTH...

Dirk
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Slide

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Apr 23, 2020, 8:11:02 AM4/23/20
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For JNLP, the connection is done from the agent. It launches the agent.jar which connects to the master. If the agents are using "JNLP" then the launch command for that agent would possibly need to be updated if your master is at a different hostname/ip address than the old master. 

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Dirk Heinrichs

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Apr 23, 2020, 8:16:57 AM4/23/20
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Am Donnerstag, den 23.04.2020, 05:10 -0700 schrieb Slide:

For JNLP, the connection is done from the agent. It launches the agent.jar which connects to the master.

But one needs to actively issue an "Add node" from the master to create it. That's also true for SSH slaves, but not for Swarm slaves.

Bye...

D'raj

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Apr 23, 2020, 10:18:09 AM4/23/20
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What I am unaware of is, how my windows host behaves when I disconnect it from one jenkins server to another?
Specifically with Linux host, do I need to take any extra care?
Where do I keep jenkins slave .jar file in linux?
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D'raj

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Apr 23, 2020, 10:18:29 AM4/23/20
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Connected via JNLP agent

D'raj

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Apr 24, 2020, 1:07:34 PM4/24/20
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I am not getting option Launch agent via Java Web Start for Jenkins master(Linux), When I try to install plugin it says plugin is already installed.
tried windows-slaves version 1.6 and 1.5

Tried using Launch agent via SSH  but it keep spinning forever does not return to Jenkins, after refresh I see the node is still offline.

Am I missing something?
What should be permissions of /var/lib/jenkins directory?


Windows-slaves plugin

Pierre BEITZ

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Apr 24, 2020, 4:09:08 PM4/24/20
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Did you check in the security settings if the JNLP port is enabled? Usually when you don't see the JNLP launch method this is the reason. 

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