Question

我试图从docker compose开始绕过K8。我想用我推到注册表的两个容器设置我的第一个pod。以下问题：

如何通过DNS将IP获取到环境变量中，以便registrator可以连接到consul？请参阅args consul://consul:8500中的容器注册器。领事需要通过环境进行更改。

{
  "kind": "Pod",
  "apiVersion": "v1",
  "metadata": {
    "name": "service-discovery",
    "labels": {
      "name": "service-discovery"
    }
  },
  "spec": {
    "containers": [
      {
        "name": "consul",
        "image": "eu.gcr.io/{myproject}/consul",
        "args": [
          "-server",
          "-bootstrap",
          "-advertise=$(MY_POD_IP)"
        ],
        "env": [{
          "name": "MY_POD_IP",
          "valueFrom": {
            "fieldRef": {
              "fieldPath": "status.podIP"
            }
          }
        }],
        "imagePullPolicy": "IfNotPresent",
        "ports": [
          {
            "containerPort": 8300,
            "name": "server"
          },
          {
            "containerPort": 8400,
            "name": "alt-port"
          },
          {
            "containerPort": 8500,
            "name": "ui-port"
          },
          {
            "containerPort": 53,
            "name": "udp-port"
          },
          {
            "containerPort": 8443,
            "name": "https-port"
          }
        ]
      },
      {
        "name": "registrator",
        "image": "eu.gcr.io/{myproject}/registrator",
        "args": [
          "-internal",
          "-ip=$(MY_POD_IP)",
          "consul://consul:8500"
        ],
        "env": [{
          "name": "MY_POD_IP",
          "valueFrom": {
            "fieldRef": {
              "fieldPath": "status.podIP"
            }
          }
        }],
        "imagePullPolicy": "Always"
      }
    ]
  }
}

Answer 1

使用Kubernetes中的Service将pod暴露给其他应用程序。一旦您定义了服务，您就可以在您的pod中使用与该服务相关的环境变量。直接暴露Pod并不是一个好主意，因为Pods可能会被重新安排。

例如使用这样的服务：

apiVersion: v1
kind: Service
metadata:
  name: consul
  namespace: kube-system
  labels:
    name: consul
spec:
  ports:
    - name: http
      port: 8500
    - name: rpc
      port: 8400
    - name: serflan
      port: 8301
    - name: serfwan
      port: 8302
    - name: server
      port: 8300
    - name: consuldns
      port: 8600
  selector:
    app: consul

相关的环境变量为CONSUL_SERVICE_IP

无论如何，由于here

所述的某些原因，似乎其他人实际上已停止使用该环境变量

通过kubernetes中的DNS将IP转换为env变量

1 个答案: