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Fedi Admins of Lemmy, How do you keep your servers up to date without increasing downtime
(lemmy.blahaj.zone)
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Not much of an addition, but you're absolutely right, in most systems that are expected to be highly available, there's standard maintenance times, an agreement in place, and no critical use of the system is permitted to be scheduled in that regular time period. Any deployments are limited to that window, in case a rollback is necessary, data sync, etc.
All of that is in addition to the type of high availability stuff you're describing.