This chapter discussed various topics on how to prepare and operate a Docker cluster with a stable configuration. We introduced a low-cost alternative to Lambda by deploying a Docker cluster on Spot instances. This chapter also introduced the concept of CoreOS's operator pattern, and how to use it practically to auto-balance the tasks of our cluster.

When it comes to logging, the ELK stack is usually the first choice. This chapter also discussed how to efficiently prepare ELK on Docker Swarm and it ended with how to operate a cluster with Golang scripts, the scripting technique that can fully leverage Docker and its ecosystem.

In the next chapter, we will put all FaaS platforms into the same cluster and make them work together to demonstrate a use case of event-driven FaaS systems over a Docker cluster.