为什么alertmanager在访问发送警报url时显示超时

alertmanager:v0.14.0 )邮件发送工作,这是我从kubernetes集群的pod发送的测试脚本:

alerts1='[
  {
    "labels": {
        "alertname": "DiskRunningFull",
        "dev": "sda1",
        "instance": "example1"
      },
      "annotations": {
        "info": "The disk sda1 is running full",
        "summary": "please check the instance example1"
      }
  }
]'

curl -XPOST -d"$alerts1" http://alertmanager.kube-system.svc.cluster.local:80/api/v1/alerts

/ # curl -XPOST -d"$alerts1" http://alertmanager.kube-system.svc.cluster.local:80/api/v1/alerts
curl: (7) Failed to connect to alertmanager.kube-system.svc.cluster.local port 80: Connection refused

我正在用这样的方式ping服务:

/ # ping alertmanager.kube-system.svc.cluster.local
PING alertmanager.kube-system.svc.cluster.local (10.254.193.27): 56 data bytes
64 bytes from 10.254.193.27: seq=0 ttl=64 time=0.039 ms
64 bytes from 10.254.193.27: seq=1 ttl=64 time=0.054 ms

显示dns工作正常。所以问题出在哪里,我阅读了alertmanger服务的pod,没有发现错误输出。我该怎么解决这个问题?这是我的服务yaml:

{
  "kind": "Service",
  "apiVersion": "v1",
  "metadata": {
    "name": "alertmanager",
    "namespace": "kube-system",
    "labels": {
      "addonmanager.kubernetes.io/mode": "Reconcile",
      "kubernetes.io/cluster-service": "true",
      "kubernetes.io/name": "Alertmanager"
    },
  "spec": {
    "ports": [
      {
        "name": "http",
        "protocol": "TCP",
        "port": 80,
        "targetPort": 9093
      }
    ],
    "selector": {
      "k8s-app": "alertmanager"
    },
    "clusterIP": "10.254.193.27",
    "type": "ClusterIP",
    "sessionAffinity": "None"
  }
}