Ahh... well that makes sense, but I'm fairly certain that the EC2 plugin 
doesn't currently offer any way to initiate the 'timeout' process that results 
in an instance being stopped (as opposed to terminated). It's possible that the 
existing function that handles timeouts could be called from a Groovy script, 
but this would require some experimentation.

If you start by building a testing a script that can enumerate the Jenkins 
nodes that are EC2 slaves, I can help you try to find the next steps.

----- Original Message -----
From: [email protected]
To: [email protected]
Cc: Kevin Fleming (BLOOMBERG/ 731 LEXIN)
At: Jan 21 2014 13:17:48

Presently, they have been idle when the shutdown occurs. I'm working on 
updating the shutdown process to try to ensure that it waits until all jobs are 
complete to enforce this.

On Tuesday, January 21, 2014 12:13:31 PM UTC-6, Kevin Fleming wrote:
Are these slaves running active jobs, or are they idle (from Jenkins point of 
view)?

----- Original Message -----
From: [email protected]
To: [email protected]
Cc: Kevin Fleming (BLOOMBERG/ 731 LEXIN)
At: Jan 21 2014 13:12:43

I would like to stop them, not terminate them. Is there a proper way to stop 
the instance from a Groovy script?

On Tuesday, January 21, 2014 11:51:00 AM UTC-6, Kevin Fleming wrote:
Yes, a Groovy script could iterate over the current list of Jenkins nodes, 
determine which ones are EC2 slaves, and then delete them. This would terminate 
the EC2 instances for those slaves.

----- Original Message -----
From: [email protected]
To: [email protected]
At: Jan 21 2014 12:24:52

Our Jenkins master server runs on an EC2 instance and we stop it twice a day to 
switch between a small and medium instance to reduce our bills during off 
hours. Our build slaves are EC2 instances using the Jenkins EC2 plugin. To keep 
the builds fast we have it configured to only stop the slaves rather than 
terminate them.

We are finding that when the master machine stops and restarts when an EC2 
slave is running, the EC2 instance stays running and the master slave is never 
able to re-establish a connection with it. It still has the instance ID 
correct. But, it is unable to connect. This requires manual intervention of 
terminating the old instances and starting new ones.

Is there some way we can properly stop the EC2 instances using a Jenkins Groovy 
script before shutting down the Jenkins instance? Hopefully this way the EC2 
plugin will correctly re-establish the connection on start-up. We have a 
Jenkins job which controls the timing of the shutdown process.-- 
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