Docker Swarm is provisioned by first initiating a Swarm to create a manager node and subsequently joining worker nodes to that manager node. Docker Swarm provides distributed service deployment for Docker applications.
The Problem
By default, a Docker Swarm is provisioned on a single zone on AWS, as illustrated in Figure 3-1. With the manager nodes and all the worker nodes in the same AWS zone, failure of the zone would make the zone unavailable. A single-zone Swarm is not a highly available Swarm and has no fault tolerance.
