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Spilo is a Docker image that provides PostgreSQL and Patroni bundled together. Patroni is a template for PostgreSQL HA. Multiple Spilos can create a resilient High Available PostgreSQL cluster. For this, you'll need to start all participating Spilos with identical etcd addresses and cluster names.
Spilo is currently evolving: Its creators are working on a Postgres operator that would make it simpler to deploy scalable Postgres clusters in a Kubernetes environment, and also do maintenance tasks. Spilo would serve as an essential building block for this. There is already a Helm chart that relies on Spilo and Patroni to provision a five-node PostgreSQL HA cluster in a Kubernetes+Google Compute Engine environment. (The Helm chart deploys Spilo Docker images, not just "bare" Patroni.)
Spilo's setup assumes that you've correctly configured a load balancer (HAProxy, ELB, Google load balancer) that directs client connections to the master. There are two ways to achieve this: A) if the load balancer relies on the status code to distinguish between the healthy and failed nodes (like ELB), then one needs to configure it to poll the API URL; otherwise, B) you can use callback scripts to change the load balancer configuration dynamically.
