Re: Bugzilla HA How to?

"So, as said: What are you actually trying to protect against? Better start with simple backups to be able to revert in case of problems."
It is more like a planned failover, current server upgrade takes about two hours (OS upgrade, reboots, etc.) while Bugzilla is unavailable, I'd like to cut this planned downtime as short as possible. This is the main goal.


On Thursday, March 11, 2021 at 11:19:48 AM UTC-5, Thorsten Schöning wrote:
> Guten Tag Laci D, 
> am Donnerstag, 11. März 2021 um 15:41 schrieben Sie:
> > - stand up a bugzilla-02.hostame.com server which syncs
> > /usr/local/www/bugzilla/data/ from 01 to 02[...] 
> 
> That directory is an implementation detail of Bugzilla and might 
> change at any time. So syncing that only into another arbitrary older 
> or even newer version of Bugzilla is a risk in theory. Taking all or 
> nothing should be the better approach.
> > - set bugzilla-01.hostame.com read only (if bugzilla has such an 
> > option, if not change DB connection to a read only replica)
> Bugzilla can be put into maintenance mode, but NOT into read-only. 
> Read-only is used automatically for such operations IF shadow 
> databases are configured. 
> 
> > shutdownhtml 
> https://bugzilla.readthedocs.io/en/5.0/administering/parameters.html#general
> > What do you think, does this look feasible?
> First of all I still don't see against what your HA-setup should 
> actually protect and your should REALLY reconsider if such a 
> complexity is necessary to start with at all. Keep in mind that things 
> heavily depend on the number of outtakes you have e.g. because of 
> updates and those weren't too many in the near past at all. 
> 
> Said that, your setup won't work at all: You forgot the database. 
> Upgrading Bugzilla sometimes means new database schema and when you 
> only update/test one instance, the other is per definition NOT able to 
> use the same schema anymore/yet. OTOH, if you have multiple different 
> databases for Bugzilla, you have actual data in different databases 
> and need to merge that at some point. That is neither trivial nor HA. 
> 
> You won't change that problem with database clusters or stuff as well: 
> As long as you are running two different versions of Bugzilla, you can 
> not assume to use the same database for both. 
> 
> So, as said: What are you actually trying to protect against? Better 
> start with simple backups to be able to revert in case of problems.
> Mit freundlichen Grüßen 
> 
> Thorsten Schöning 
> 
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> Für Rückfragen stehe ich Ihnen sehr gerne zur Verfügung. 
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> Mit freundlichen Grüßen 
> 
> Thorsten Schöning 
> 
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