stolon is a cloud native PostgreSQL manager for PostgreSQL high availability. It's cloud native because it'll let you keep an high available PostgreSQL inside your containers (kubernetes integration) but also on every other kind of infrastructure (cloud IaaS, old style infrastructures etc...)

• leverages PostgreSQL streaming replication
• works inside kubernetes letting you handle persistent high availability
• uses etcd as an high available data store and for leader election
• asynchronous (default) and synchronous replication.

Stolon is composed of 3 main components

• keeper: it manages a PostgreSQL instance converging to the clusterview provided by the sentinel(s).
• sentinel: it discovers and monitors keepers and calculates the optimal clusterview.
• proxy: the client's access point. It enforce connections to the right PostgreSQL master and forcibly closes connections to unelected masters.

• PostgreSQL >= 9.4
• etcd >= 2.0

./build

• simple cluster example
• kubernetes example

Stolon tries to be resilent to any partitioning problem. The cluster view is computed by the leader sentinel and is useful to avoid data loss (one example over all avoid that old dead masters coming back are elected as the new master).

There can be tons of different partitioning cases. The primary ones are covered (and in future more will be added) by various integration tests