Today, like the past few days, we have had some downtime. Apparently some script kids are enjoying themselves by targeting our server (and others). Sorry for the inconvenience.
Most of these ‘attacks’ are targeted at the database, but some are more ddos-like and can be mitigated by using a CDN. Some other Lemmy servers are using Cloudflare, so we know that works. Therefore we have chosen Cloudflare as CDN / DDOS protection platform for now. We will look into other options, but we needed something to be implemented asap.
For the other attacks, we are using them to investigate and implement measures like rate limiting etc.
I’m really interested now which one of you is right. While the other person put some effort and gave a lot of actual information, you just come off as arrogant. Still, maybe you’re right. Care to elaborate why?
I’m not one of these 2 arguing. But in general the app servers don’t do caching or state handling.
You cache things in a third external cache such as redis or memcached. So if a user connects to app server 1 and then to app server 2 they will both grab cachee info from redis. No extra db calls required. This has been the basic way of doing things even with old school WordPress sites forever. You also store session cookies in there or in the db.
And even if you weren’t caching externally like this, databases use up a lot of memory to cache tons of data. So even if the same query hits the db the second hit would probably still be hot in memory and return super fast. It’s not double the load. At least with postgres this is the case and it’s what Lemmy uses.
Not trying to come off as arrogant, but definitely incensed when I catch armchair tech heroes throwing wildly inaccurate information out there as if it were fact. This person has a very basic understanding of some terminology here, and zero idea how it is applied in the real world. Hate to see it.