Chapter 8

1. a: Docker Swarm is built into Docker Engine, but we have to enable Swarm mode for it to work. We can deploy other orchestrators such as Kubernetes, but it will involve extra work to deploy them. Orchestrators allow us to deploy applications on clusters, hence Swarm will deploy distributed applications.
2. d: Docker Swarm provides service discovery via DNS, internal load balancing for services and their tasks, and overlay networking for services and containers distributed on different nodes.
3. b: Each cluster has only one leader node. The leader is elected from the available managers. When we initialize a cluster, the first node will be the leader until a new election is required. All managers will run workloads unless we specifically avoid them using service constraints.
4. d: Roles can be changed as we require, such as for maintenance, for example. We need to always maintain the defined number of odd managers to avoid cluster instability.
5. a and b: By default, Docker Swarm will deploy...