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Using etcd as Patroni DCS with the Zalando Postgres Operator

Patroni is a reliable cluster software for Postgres which, when running on Kubernetes, can use the Kubernetes API itself as DCS (Distributed Config Store). This is very nice, but on Kubernetes clusters with an unreliable API / Controlplane, this can lead to demotion of your cluster leader and thereby unhappy users. Gladly, Patroni supports other setups as DCS like etcd.

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