Docker Certified Associate Certification Training Course - Quorum in a Swarm Cluster

The video tutorial explains the importance of quorum in Docker Swarm clusters, focusing on the role of manager nodes in managing the swarm state using the Raft consensus algorithm. It discusses the trade-offs between performance and fault tolerance when deciding the number of manager nodes. The tutorial emphasizes the need for a quorum to ensure fault tolerance and provides guidelines for maintaining it, recommending an odd number of managers to facilitate quorum maintenance.

What is the primary role of manager nodes in a Docker Swarm cluster?

• To execute tasks on worker nodes

• To handle data storage

• To manage and store the swarm state

• To provide network security

What is a trade-off when adding more manager nodes to a swarm?

• Reduced write performance

• Decreased fault tolerance

• Improved network speed

• Increased security

What is required for a quorum in a Docker Swarm cluster?

• No agreement is necessary

• Only one manager needs to agree

• All manager nodes must agree

• A majority of managers must agree

Why is an odd number of manager nodes recommended in a swarm?

• It makes achieving quorum easier

• It simplifies network configuration

• It reduces the number of nodes needed

• It increases data storage capacity

What happens if a swarm loses its quorum of managers?

• Existing tasks continue to run

• The swarm shuts down completely

• New tasks can be started

• Manager nodes can be added