On Mon, Nov 28, 2022 at 10:49:28AM +0100, Aurelien Bompard wrote: > > - You'll need to share the same redis password across several projects. > > Redis does have users and permissions, at least from a quick look at > their docs: > https://docs.redis.com/latest/rc/security/database-security/passwords-users-roles/ > > > - Since you'll use an emptyDir (in-memory storage), every restart will > > flush the cache for all connected applications. > > I was thinking of running Redis in a VM, not in OpenShift. Sorry if > that wasn't clear in my initial message. > > > - Applications owners lose control over the redis instance in case they > > want to do some fancy stuff with it, or just general debugging. > > True. > > > It avoids a single point of failure for a bunch of services. > > Right, but that's what our PostgreSQL host is at the moment already.
Yeah, true. I have thought about splitting that out too, but I am not sure if I think it's a good idea to have databases in openshift and making them vm's adds overhead of more vm's. > > Contention/resource problems. (ie, one app is hammering the shared instance > > and starving other apps for resources). > > True, true. > > OK, that makes sense. The good thing about having a central Redis DB > was, in my mind, to have persistent storage. What happens if I store a > lot of data in the Redis Openshift pod? Won't that hit a memory limit? > I think our current usage of Redis has been pubsub and light cache, > but we haven't stored a lot of data in there yet. Well, we can actually do persistent storage in the ocp4 cluster. ;) There's nfs volumes, but also there's a local ceph storage (using disk on the compute nodes). I'm not sure how slow/fast it might be, but it is there... kevin
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