I finally used Packer to build an AMI based on Amazon Linux 2 to act as as
agent. Yesterday, the builds began failing with a Java stack trace.

Turns out the EC2 instance starts, and in parallel the Jenkins agent begins
and an auto-upgrade of openjdk kicked off. Further instructions failed.
Rebuild the AMI and the new agent worked a treat.

Is there a way of avoiding this problem by preventing Jenkins from
launching the agent until the boot steps are complete? I cannot be the
first to encounter this issue :-)



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