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Membership Services
Notice when machines join the cluster
Notice when machines leave the cluster
Notice when links go down
Notice when links come back up
Notify interested parties
Many kinds of comm media
- Includes "ping membership" for router, switch, etc.
Notes:
The minimal set of services which every HA cluster needs
Tie cluster membership to the previous slide
Cluster communications isn't immediately obviously related to cluster membership
Cluster Manager won't be talked about further