Clustering with Docker Swarm

We have already covered all the fundamental aspects of the Continuous Delivery pipeline. In this chapter, we will see how to change the Docker environment from a single Docker host into a cluster of machines and how to use it all together with Jenkins.

This chapter covers the following points:

• Explaining the concept of server clustering
• Introducing Docker Swarm and its most important features
• Presenting how to build a swarm cluster from multiple Docker hosts
• Running and scaling Docker images on a cluster
• Exploring advanced swarm features: rolling updates, draining nodes, multiple manager nodes, and tuning the scheduling strategy
• Deploying the Docker Compose configuration on a cluster
• Introducing Kubernetes and Apache Mesos as alternatives to Docker Swarm
• Dynamically scaling Jenkins agents on a cluster

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