Running Postgres in Kubernetes [pdf]
Unless you have a really good shared storage, I don't see any advantage for running Postgres in Kubernetes. Everything is more complicated without any real benefit. You can't scale it up, you can't move pod. If pg fails to start for some reason, good luck jumping into container to inspect/debug stuff. I am neither going to upgrade PG every 2 weeks nor it is my fresh new microservice that needs to be restarted when it crashes or scaled up when I need more performances. And PG has high availability solution which kind of orthogonal to what k8s offers.One could argue that for sake of consistency you could run PG in K8S, but that is just hammer & nail argument for me.But if you have a really good shared storage, then it is worth considering. But, I still don't know if any network attached storage can beat local attached RAID of Solid state disks in terms of performance and/or latency. And there is/was fsync bug, which is terrible in combination with somewhat unreliable network storage.For me, I see any database the same way I see etcd and other components of k8s masters: they are the backbone. And inside cluster I run my apps/microservices. This apps are subject to frequent change and upgrades and thus profit most from having automatic recovery, failover, (auto)scaling, etc.