The runlevel endpoint provides the possibility to switch the runlevel on a content server.

Endpoint properties. 

management.endpoint.runlevel.access=unrestricted

Endpoint URL. 

http://localhost:8081/actuator/runlevel

When requested using a GET HTTP request, the endpoint will respond which runlevel is currently active.

Response. 

{
  "RUNLEVEL": "ONLINE"
}

To switch the runlevel, send a POST request to the endpoint with the desired runlevel and a grace period for the switch.

Switch runlevel. 

curl -X POST -H "Content-Type: application/json" \
     -d '{"runlevel": "MAINTENANCE", "gracePeriod": 30}' \
     http://localhost:8081/actuator/runlevel