What is Docker swarm?

You probably have not noticed this, but so far, all of the Docker workstation deployments, or nodes that we have used in our examples have been run in single-engine mode. What does that mean? Well, it tells us that the Docker installation is managed directly and as a standalone Docker environment. While this is effective, it is not very efficient and it does not scale well. Of course, Docker understands the limitations and has provided a powerful solution to this problem. It is called Docker swarm. Docker swarm is a way to link Docker nodes together, and manage those nodes and the dockerized applications that run on them efficiently and at scale. Simply stated, a Docker swarm is a group of Docker nodes connected and managed as a cluster or swarm. Docker swarm is built into the Docker engine, so no additional installation is required to use it. When a Docker...