Mastering Docker Enterprise

Docker Swarm services

Both Swarm and Kubernetes rely on the concept of services as a key orchestration element, and a durable endpoint for the collection of like containers. By like containers, we mean they share the exact same image for all container instances. For example, if a container running in your cluster needs to call an API running in another container, the caller can use the API container's service name, rather than using a container IP. This is really important because, in an orchestrated environment, containers can be replaced by the orchestrator at any time, and the resulting container will have a new IP. Therefore, using the service name assures the caller a connection to a running version of the container, which they need. ...