Chapter 8-1 (Docker)

A collection of hosts running Docker which are setup to interact with each other in a clustered configuration is called a _____

• cluster
• swarm
• collection
• group

Answer explanation

A Docker Swarm is a native clustering and orchestration tool for docker allowing you to create a cluster of Docker engines, or nodes, that work together as a singe, virtual system.

Which role is responsible for the centralized management point for all Swarm hosts?

• worker
• swarm
• manager
• node

Answer explanation

This node is responsible for the centralized management point for all Swarm Hosts.

Which of the following best describes a Docker worker node in a Swarm cluster?

• It stores the cluster state and performs orchestration tasks.
• It executes containers and services as instructed by the manager nodes.
• It acts as a load balancer, distributing traffic across the services.
• It provides a graphical user interface for managing the cluster.

Answer explanation

In a Docker Swarm, worker nodes are responsible for running the actual containers that make up your applications. The receive instructions from the manager nodes about which services to run and how many replicase to maintain.

Which option will create the manager node for a Swarm?

• init
• ls
• join
• rm

Which option will add a node to a Swarm?

• init
• ls
• join
• rm

Which command will allow you to check the Swarm?

• init
• ls
• join
• rm

The node command allows you to perform tasks on a specific node or multiple nodes.

• True
• False

Which command will remove a node from a Swarm?

• init
• ls
• join
• rm

Which command is used to display detailed information about one or more nodes in your Swarm?

• inspect
• update
• ls
• ps

Which of the following is NOT a key component of a Docker Swarm

• Swarm Manager
• Worker Node
• Docker Compose
• Service

Answer explanation

Docker compose is a tool for defining and running multiple containers together as a single application.