Will this configuration achieve fault tolerance for managers in a swarm? Solution: only two managers, one active and one passive.

An active/passive setup for managers with only two nodes means that if the active node fails, the swarm loses its quorum, even if the passive node is ready to take over, because 1 out of 2 is not a majority required by Raft.

Docker Swarm managers rely on the Raft consensus algorithm, which requires a strict majority (quorum) of nodes to operate. With only two managers, if one node fails, only one manager remains, which is not a majority of two (a majority would be two managers), thereby preventing consensus and rendering the swarm inoperable. Raft inherently works best with odd numbers of nodes.