Server Maintenance feature

ypatios ypatios

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Apr 20, 2020, 5:11:11 AM4/20/20

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Hello everyone,

there is a "maintenance" checkbox for each server in the Systems/Servers menu in the Admin-UI.

Can anyone explain what exactly it does?

Thank you,

ypatios

Lars Kiesow

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Apr 20, 2020, 5:40:42 AM4/20/20

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New jobs should not be deployed to servers in maintenance mode. Handy
if you want to take down a worker in a somewhat busy cluster. Enable
maintenance mode, wait until the current jobs are done, take it down.
–Lars

Dietmar Zenker

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Apr 20, 2020, 5:48:11 AM4/20/20

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Hi Lars,

since I have to do some maintenance work on the whole system: what will happen if the admin is set to maintenance mode?

Greetings,

Dietmar

ypatios ypatios

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Apr 20, 2020, 6:20:51 AM4/20/20

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Sounds sensible :) thanks for the info.

ypatios

Lars Kiesow

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Apr 20, 2020, 6:40:36 AM4/20/20

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If I remember correctly, this will only affect job dispatching.
Not sure if ingest will still work though.
–Lars

Greg Logan

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Apr 20, 2020, 10:14:06 AM4/20/20

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The maintenance flag affects a node's willingness to accept a new job, but does not turn off job dispatch. Putting the admin node into maintenance would pause dispatch (really creation) of *new* jobs, but current jobs (ie, already created) would still be dispatched until they're all exhausted. Ingest would still work, however no new workflows would show up. I would bet that the ingests would not even show up in the admin ui, although I have not tested that. If you want to pause ingests, turn off your load balancer/proxy in front of admin, or add an exception to the redirect for all paths prefixed with /ingest. All well behaved CAs should store things locally until you're restored the default configuration. Misbehaving CAs.... well, let's just say you shouldn't test this with prod until you're sure about your CAs :)

G

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itz.feli...@gmail.com

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Oct 15, 2024, 3:29:29 AM10/15/24

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Hi, we put one out of five worker in maintenance mode for a longer time, and the result was that plenty of workflows got stuck. It appears you have to actually shut down a worker to avoid this issue?

-- Felix

Katrin Ihler

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Oct 15, 2024, 5:00:19 AM10/15/24

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Hi Felix,

that doesn't sound right. Unless there are jobs that only that worker can process?

Cheers,

Katrin

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