Now that the swarm is up and running, it is time to look at services. A service is a collection of one or more tasks that do something. Each task is a container running somewhere in the swarm. Since services are potentially composed of multiple tasks, there are different tools to manage them. In most cases, these commands will be a subcommand of
Running containers as services in a swarm offers a number of benefits. They are as follows:
- Services can be scaled out quickly and easily.
- Swarm can perform zero-downtime upgrades where updated versions of an image are added while old versions are removed.
- Easily create overlay networks to connect containers running on multiple hosts. (Overlay networks were covered in detail ...