Glossary

Terms used in these docs, the CLI, and the SDK.

Term	Meaning
Daemon	The clusdr start process. The cluster member.
Application	A program that calls the local daemon via the SDK. Not a Raft member.
Runtime API	TCP gRPC listener (default 127.0.0.1:7947). Apps, CLI, and peers.
Control API	Unix socket. Only clusdr status uses it (file-exists check).
Voter	Raft member that votes. Default join role.
Observer	Raft non-voter. Receives the log; does not change quorum.
Leader	The current Raft leader. The only writer of replicated state.
Follower	A voter that is not leader. Forwards mutations to the leader.
Member	A daemon in the membership list (id, address, status, role).
Status	Liveness: alive, leaving, or dead. Not the same as role.
Role	Raft suffrage: voter or observer. CLI also prints leader for the current leader.
Join token	One-time secret from clusdr init. Hash stored; plaintext shown once.
Presence	Lease named presence.<nodeID>. Expiry removes the member.
Fencing token	Monotonic token on a lock or lease grant. Stale holders cannot unlock a newer grant.
Watch	Server stream of cluster and custom events.
Custom event	custom.<topic> from Publish. Gossip, not Raft.
v1alpha1	Current wire package name. Shape can still change.

See also: Architecture, Membership.