Jenkins Docker agent connection closed after casc reload

[janisliepins]

Your checklist for this issue

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• [x] Jenkins version: 2.190.1

• [x] JCASC Plugin version: 1.36.2

Description

Performing CASC reload while running build on dynamically provisioned Docker container agent (defined in Docker Cloud agent template) causes agent to close down connection channel and agent is disconnected:

Cannot contact docker-000rb698gl5tz: hudson.remoting.ChannelClosedException: Channel "unknown": Remote call on JNLP4-connect connection from .... failed. The channel is closing down or has closed down

I suspect that this is because I have defined our existing static agents in nodes: section in jenkins.yml and, still this should not be expected behavior. Although i have to mention that this is not the case for Kubernetes Jenkins agents, their connection is not terminated after casc reload. Also found similar issue with Google Cloud nodes here: #715

What could be possible solution here?

Thank you!

[jetersen]

try updating to the newer docker plugin version at least: https://github.com/jenkinsci/docker-plugin/blob/master/CHANGELOG.md#118

Also this is an issue for the docker plugin as they are responsible for instructing Jenkins in how to maintain access.

[janisliepins]

@jetersen thanks, after docker plugin upgrade everything works ok