How to create a healthcheck HTTP endpoint for Marathon task?

Question

I am trying to setup a custom http health check for a task that I will be running in Marathon.

From what I have been reading, Marathon gives you the ability to create a custom health checks by implementing an endpoint in your app with the logic of capturing what makes your app healthy.

I understand how to connect to the endpoint through the Marathon GUI, but I can’t find any resources on how to actually create an end point on a Marathon task.

Answer 1

The general documentation is here: https://mesosphere.github.io/marathon/docs/

The specific documentation for your question can be found at: https://mesosphere.github.io/marathon/docs/health-checks.html

For example you can start an application (combined with docker containers) with health checks with the following marathon configuration:

{
   "id":"app",
   "cpus":0.25,
   "mem":1024,
   "instances":2,
   "healthChecks":[
      {
         "protocol":"HTTP",
         "path":"/",
         "portIndex":0,
         "timeoutSeconds":10,
         "gracePeriodSeconds":10,
         "intervalSeconds":2,
         "maxConsecutiveFailures":10
      }
   ],
   "container":{
      "type":"DOCKER",
      "docker":{
         "image":"nginx",
         "network":"BRIDGE",
         "portMappings":[
            {
               "hostPort":0,
               "containerPort":80,
               "protocol":"tcp"
            }
         ]
      }
   }
}