docker-plugin: 1.1 breaks SSH connectivity

Hi,

Just upgraded the docker-plugin to version 1.1 - and my system stopped working.

For some reason, SSH connectivity is broken: As can be seen from the attached log, the plugin tries 30 times to connect to the Docker container without success. It then gives up.

Former plugin version is 1.0.4 and works fine with the same setup. I have a VMware snapshot of the machine before the upgrade, and by restoring to the snapshot and trying over and over again, I can reproduce the problem.

One would then expect that everything would be fine by reverting to 1.0.4 through the Jenkins UI; but unfortunately, that’s not the case. It still doesn’t work - though it fails with another error. See attached log.

Jenkins is 2.93, running on a fully updated Debian Stretch.

`jenkins@dscrum-is-i01:~$ java -version openjdk version “1.8.0_151” OpenJDK Runtime Environment (build 1.8.0_151-8u151-b12-1~deb9u1-b12) OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)

jenkins@dscrum-is-i01:~$ docker --version Docker version 17.09.0-ce, build afdb6d4 `

A complete plugin list is attached.

I can keep the relevant snapshots for a while to aid troubleshooting if needed.

Regards, Lars

Jenkins cloud setup:

The template in question:

Start of node failure log:

End of node failure log:

Node failure log after plugin revert to 1.0.4:

Complete list of plugins:

plugin-list.txt