Two on-prem hosts can be added to an HA (High Availability) group. In case one host is down, the second host can take over DHCP lease management without causing downtime. High Availability can be configured as Active/Active, Active/Passive, or Advanced Active/Passive with the following benefits:
- Active/Active: Node 1 and Node 2 are both active and constantly keep their databases synchronized. When one node is down, the workload is completely taken over by the other node. When the node is back online, it takes control of the leases that it owned before it went down. For example, on High Availability, see Configuring High Availability. For more information about High Availability vs. DHCP failover, see Kea High Availability vs ISC DHCP Failover. The address pools do not rebalance, so it is recommended to create larger pools with fewer clients. For more information, see the Active/Active diagram.
- Active/Passive: Only Node 1 manages the leases for all clients. Node 1 syncs with Node 2 to keep the database synced. If Node 1 is down, Node 2 takes over managing the leases. For more information see the Active/Passive diagram. A node can only belong to one HA group.
- Advanced Active/Passive: Advanced Active/Passive allows you to include a single node to multiple HA groups. Only Node 1 manages the leases for all clients. Node 1 syncs with Node 2 to keep the database synced. If Node 1 is down, Node 2 takes over managing the leases. A node can perform different roles in different HA groups. A node can be active in one or more HA groups, passive in one or more HA groups, or service leases individually while being part of an HA group. For more information, see the Advanced Active/Passive diagram.
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