问题描述

我在我的 centos 机器上运行一个 kubernetes 集群.我不想为 mysql 创建一个 pod.MySQL安装在同一网络的另一台机器上(机器不在kubernates私有网络中).

I am running a kubernetes cluster in my centos machine. I donot want to create a pod for mysql. MySQL is installed in another machine in same network (Machine is not in kubernates private network).

如何从运行在 kubernetes 集群中的 pod 访问 mysql 服务?

How can I access the mysql service from the pods running in kubernetes cluster ?

我已尝试使用以下配置的服务和端点.但是，运气不好.

I have tried with service and end point with below configuration. But, No luck.

apiVersion: v1
kind: Service
metadata:
  name: database
spec:
  ports:
  - port: 13080
    targetPort: 13080
    protocol: TCP
---
kind: Deployment
apiVersion: v1
metadata:
  name: database
subsets:
  - addresses:
      - ip: XX.XX.XX.XX
    ports:
      - port: 13080
---
kind: ReplicationController
metadata:
  name: test
spec:
  replicas: 1
  selector:
    app: test
  template:
    metadata:
      name: test
      labels:
        app: test
    spec:
      containers:
      - name: my_pods
        image: my_pods
        env:
         - name: DATABASE_HOST
           value: database
         - name: DATABASE_PORT
           value: "13080"
         - name: DATABASE_USER
           value: "SAAS"
         - name: DATABASE_PASSWORD
           value: "SAAS"
         - name: DATABASE_NAME
           value: "SAASDB"
        ports:
          - containerPort: 8080
      imagePullSecrets:
        - name: my-secret
---
apiVersion: v1
kind: Service
metadata:
  name: test-service
  labels:
    name: test-service
spec:
  type: NodePort
  ports:
     - port: 11544
       targetPort: 8080
       nodePort: 30600
  selector:
    name: test

推荐答案

对于集群外的事物，您不需要服务.根据您使用的网络模型，docker 容器(即 kubernetes pod)应该能够通过 Docker 设置的网桥正常连接到 MySQL 容器.检查主机在端口 3306 上是否具有连接性，并且确实如此，只需输入 DNS 名称(您的 kube-dns pod 应该将任何基于非 kubernetes 的请求转发到它被调度到的主机的主机 resolv.conf)

You don't need a service for things outside the cluster. Depending on the networking model you're using, the docker container (ie kubernetes pod) should be able to connect to the MySQL container normally via the bridge that Docker sets up. Check the host has connectivity on port 3306, and it does, simply put in the DNS name (your kube-dns pod should forward any non kubernetes based requests on to the hosts resolv.conf of the host it was scheduled on)

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