k8s 引入外部服务

本文档已经安装好k8s测试环境

本实验用k8s 1.20版本，mysql 5.7版本

vi mysql-svc.yaml
---
apiVersion: v1
kind: service
metadata: 
  name: mysql
  nameapace: default
spec:
  clusterIP: None
  ports:
  - name: mysql
    port: 3306
    protocol: TCP
    targePort: 3306
  type: ClusterIP
---
apiVersion: v1
kind: Endpoints
metadata: 
  name: mysql
  nameapace: default
subsets:
- addresses:
  - ip: 192.168.1.99
  ports:
  - name: mysql
    port: 3306
    protocol: TCP
        

kubectl apply -f mysql-svc.yaml
可以查看一下创建后的描述信息
kubectl describe svc/mysql
kubectl describe endpoints/mysql

可以做个测试启动一个centos的容器或者其他的

vi cenots.yml

apiVersion: v1
kind: Pod
metadata:
  name: cdh-master
  labels:
    role: cdh6.3
spec:
  containers:
    - name: centos7-1
      image: registry.cn-hangzhou.aliyuncs.com/dragon8512/centos7jdk8ssh:v1
      ports:
        - containerPort: 22
          hostPort: 50022
          protocol: TCP

kubectl apply -f centos.yaml

cdh-master(这个是centos的pod名字)
kubectl exec -it cdh-master sh

安装 mysql
ping mysql.default.svc.cluster.local

mysql -uroot -p123456 -h mysql.default.svc.cluster.local

show databases;