[Pulp-list] redis on a passive backup server

[Brian Bouterse]

On Mon, Sep 20, 2021 at 5:40 PM Matthias Dellweg <mdellweg at redhat.com>
wrote:

> I am not sure if the cache invalidations will be pushed to all redis
> instances if deployed that way. Maybe there is a little bit of extra
> work needed.
>
I imagined the backup Pulp would have its Redis empty because that Pulp
wasn't in use. If that were the case cache invalidations not reaching it
would be fine because the cache would be empty at failover time. As always
though, there could be more needed to handle some specific use cases.


> On Mon, Sep 20, 2021 at 10:31 PM Brian Bouterse <bmbouter at redhat.com>
> wrote:
> >
> > I believe with 3.14+ and new style workers, you can have an independant
> redis on the backup server.
> >
> > With the new-style tasking system (the default in 3.14) you no longer
> need Redis for tasking. It's only purpose then is to help speedup the
> content app which caches info about requests to make answering subsequent
> content-app requests easier. If those caches miss, e.g. if you had a
> failover event, Pulp will continue to work fine, just building the Redis
> cache data as it goes.
> >
> > On Mon, Sep 20, 2021 at 4:22 PM Bin Li (BLOOMBERG/ 120 PARK) <
> bli111 at bloomberg.net> wrote:
> >>
> >> We configured a redis slave on a passive backup server which shares the
> same external database with the primary pulp server. I noticed the task
> queues are now being tracked in the database. Is it still necessary to
> configure redis as a slave or we can have an independent instance of redis
> on the backup server?
> >>
> >> Thanks
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> >
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>
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