Docker Swarm
Docker, Inc. provides a native clustering solution called Docker Swarm. A Swarm cluster is a pool of Docker nodes that can be managed as if they were a single machine. Swarm uses the standard Docker API, which means existing tools are fully compatible, including the Docker client. Docker Swarm is a monolithic scheduler where a single Swarm Master that’s aware of the entire cluster state is responsible for scheduling.
As shown in Figure 5.2, a Docker Swarm cluster will contain one or more Swarm Masters, a number of nodes running the Docker daemon, and a discovery backend, not to be confused with container discovery services covered later in the networking section of this chapter.
FIGURE 5.2: Docker Swarm cluster overview
Master ...
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