unit	template_state	node_states	purpose
haproxy.service	disabled,inactive	nginx01=enabled,active;nginx02=enabled,active	MySQL,Redis,MQTT proxy
nginx.service	disabled,inactive	nginx01=enabled,active;nginx02=enabled,active	front HTTP reverse proxy
orchestrator.service	disabled,inactive	nginx01=enabled,active;nginx02=enabled,active	MySQL HA Raft control
sentinel5.service	disabled,inactive	nginx01=disabled,inactive;nginx02=enabled,active	third Redis5 Sentinel
sentinel7.service	disabled,inactive	nginx01=disabled,inactive;nginx02=enabled,active	third Redis7 Sentinel
keepalived.service	disabled,inactive	nginx01=disabled,inactive;nginx02=disabled,inactive	front,mqtt,db-proxy VIP election; Q-251 enables explicitly after all HA gates