DCA · Question #85
DCA Question #85: Real Exam Question with Answer & Explanation
The correct answer is B: No. A 3-3-1 distribution of seven Docker Swarm managers across three datacenters is not an ideal configuration as it results in one datacenter becoming a single point of failure for quorum.
Question
Seven managers are in a swarm cluster. Is this how should they be distributed across three datacenters or availability zones? Solution: 3-3-1
Options
- AYes
- BNo
Explanation
A 3-3-1 distribution of seven Docker Swarm managers across three datacenters is not an ideal configuration as it results in one datacenter becoming a single point of failure for quorum.
Common mistakes.
- A. A 3-3-1 distribution means that if one of the datacenters with three managers goes offline, the remaining total of four managers barely meets quorum, and any further node loss would compromise cluster availability.
Concept tested. Docker Swarm manager quorum distribution
Reference. https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-high-availability
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