doujiao1905
doujiao1905
2018-12-21 19:48

使用Marathon / Mesos进行Prometheus动态端口服务发现

  • mesos
  • java
  • marathon
  • prometheus

I've been unable to find an answer to this after days of Googling. I have a service running in Marathon/Mesos. I have a Prometheus cluster scraping metrics. My Marathon metrics port config looks like this:

{
  "containerPort": 8081,
  "hostPort": 0,
  "servicePort": 31301,
  "protocol": "tcp",
  "labels": {
    "metrics": "/metrics"
  }
}

Prometheus, configured with just a boilerplate marathon-sd config, successfully finds this target, but it then listens for metrics on: __address__ = [NodeIP]:31301; so it's listening on the host's IP with the service port, rather than the dynamically assigned host port, while the service port only matters for Marathon-LB.

I know that Marathon defines the environment variable $PORT0 in the container to be the host port, however I can't figure out how to access this from the Prometheus SD config, nor how to access other fields dynamically configured by Marathon like Endpoints. Does anyone have any suggestions? I can't/don't want to assign a static hostPort because I have more containers than there are physical nodes in the cluster, as is sort of the point with container orchestration.

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