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I am aware of Crunchy Data doing PostgreSQL-on-Kubernetes:

https://www.crunchydata.com/products/crunchy-postgresql-for-...

We run the official Postgres docker image as a StatfeulSet. Very easy to setup, and we haven’t had any issues with it.

Do you run a single instance Postgres or a cluster? What kind of failure modes have you tested if you’re running a cluster?

Single instance. And we have small scale.

The open source database vitess is pretty much designed to be a cloud native production mysql and there are helm charts for it (https://github.com/vitessio/vitess/tree/master/helm) an operator based on the the metacontrollers (https://github.com/vitessio/vitess-operator) and a company called planetscale thats making an operator that has even more features then those two (I work for planetscale and have been building our operator )