VM Termination and Creation script about bosh HOT 8 CLOSED

James, would these be release job scripts? Or if not, how would you like to inject the monitoring behaviour into the VMs? Or do you want notifications to 3rd party systems via director/NATS messages?

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For my needs, just simple script triggers on the box - similar to the job scripts.
NATS/director integration would be nice, but a bit overkill

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Agreed: post-install and pre-removal scripts for jobs-deployed-on-vms would be very useful for me too. Currently I'm having to do things every time a job starts rather than once once it's been installed. The obvious variants of "once this job has been started for the first time" and "before this job is stopped for the last time" are very useful too.

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@tsaleh Is this a story you want prioritized?

@mark-rushakoff / @d

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Interesting. Isn't this functionality what the drain scripts are for? The DEAs, for instance, know to migrate running customer applications to another box before they're decommissioned.

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Drain scripts were what was originally suggested in the discussion thread I linked to, but unless something has changed, drain happens on every job shutdown, not on a decommission.

I envision this functionality being used when you have something you need to do once, at a particular point during commissioning/decommissioning.

For me, this would be triggering a few hundred GB of data migration away from the persistent data disk - and that's not something I'd want done on every job shutdown.

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@goehmen I think post_install is already a thing; would the changes we are making to drain scripts cover the pre-removal use case?

Thanks,
CF Community Pair (@adamstegman & @mbhave)

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@james-masson Drain scripts now have a way to determine if persistent disk size is going to change (0 size means that either persistent disk was removed or instance is going away). You can get that value by parsing BOSH_JOB_STATE & BOSH_JOB_NEXT_STATE environment variables (https://github.com/cloudfoundry/bosh-agent/blob/master/agent/drain/concrete_script.go) if you are using new BOSH Agent (written in go).

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