Jenkins slave can't connect via ssh to GCE instance

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      When setting up the GCE plugin, I'm unable to get the slave to connect properly. The logs show only an authentication error:

       

      Aug 13, 2018 2:44:45 PM null
INFO: Connected via SSH.
Aug 13, 2018 2:44:45 PM null
WARNING: Authentication failed. Trying again...
Aug 13, 2018 2:45:00 PM null
INFO: Authenticating as jenkins
Aug 13, 2018 2:45:00 PM null
INFO: Connecting to 10.1.2.3 on port 22, with timeout 10000.
Aug 13, 2018 2:45:00 PM null
INFO: Connected via SSH.
Aug 13, 2018 2:45:00 PM null
WARNING: Authentication failed. Trying again...
Aug 13, 2018 2:45:15 PM null
INFO: Authenticating as jenkins
Aug 13, 2018 2:45:15 PM null
INFO: Connecting to 10.1.2.3 on port 22, with timeout 10000.
Aug 13, 2018 2:45:16 PM null
INFO: Connected via SSH.

      Eventually it throws a "bootstrapresult failed" error:

       

      Aug 13, 2018 2:50:36 PM null 
WARNING: bootstrapresult failed

      I can't find any way to begin debugging this issue. The Google Cloud console shows that a new ssh key has been added to the metadata on the freshly provisioned instance, corresponding to the user that Jenkins will use, but I can't get any further logs from the system; logging into the freshly provisioned instance with a different user and examining /var/log/secure doesn't show any ssh login failures.

            Assignee:
            Rachel Yen
            Reporter:
            Alexander O'Donovan-Jones
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              Created:
              Updated:
              Resolved: