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Simple Stack

In this chapter, we will learn how to build a quick, yet adaptable, high availability stack to keep our PostgreSQL servers online. In order to do that, we will cover the following recipes:

Preparing systems for the stack
Installing and configuring etcd
Installing and configuring HAProxy
Installing and configuring Patroni
Performing a managed failover
Using an outage to test availability
Adding a node back into the cluster
Adding additional nodes to the mix
Replacing etcd with ZooKeeper
Replacing etcd with Consul
Upgrading while staying online

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