## Why
After v0.1.4 pointed HA peer URLs at per-pod ClusterIP Services, kea-dhcp4 2.6
starts the HA service but then crashes at hook load:
DHCP4_CONFIG_LOAD_FAIL ... Error initializing hooks: CmdHttpListener::run
failed: unable to setup TCP acceptor for listening to the incoming HTTP
requests: bind: Cannot assign requested address
With core multi-threading enabled (Kea 2.6 default), the HA hook opens a
dedicated HTTP listener bound to *this* server's peer url address. That address
is now a per-pod ClusterIP — virtual (kube-proxy DNAT), not assignable on the
pod — so the bind fails. Peers must be reached via ClusterIP, but the local
listener must bind a pod-local address.
## How
- Set the HA relationship's multi-threading block http-dedicated-listener:false
(enable-multi-threading:true). Per Kea 2.6 docs this makes inbound HA traffic
flow through kea-ctrl-agent instead of a hook-owned listener. The ctrl-agent
sidecar already binds 0.0.0.0:8000, and the per-pod Service targetPort 8000
routes ClusterIP:8000 to that container, so remote peers keep reaching this
server at its ClusterIP while nothing binds the virtual address locally.
- Regression tests: rendered config disables the dedicated listener (string +
parsed high-availability.multi-threading assertion); ctrl-agent binds 0.0.0.0
(the pod-local address the CA-mediated route depends on).
unkin-agent