service自动发现，yaml文件管理内外部端口访问

service服务发现

[root@k8s-master ~]# vim busybox-5d4f595646-dzjv4.yaml

apiVersion: v1

kind: Pod

metadata:

name: busybox

namespace: default

spec:

containers:

- image: busybox

command:

- sleep

- "3600"

imagePullPolicy: IfNotPresent

name: busybox

restartPolicy: Always

[root@k8s-master ~]# kubectl create -f busybox-5d4f595646-dzjv4.yaml

[root@k8s-master ~]# kubectl get pod

NAME                                READY     STATUS    RESTARTS   AGE

busybox                             1/1       Running   0          1m

进入创建的pod可以看到负载到的cluster IP 和端口

[root@k8s-master ~]# kubectl exec -it busybox sh

/ # env

KUBERNETES_SERVICE_PORT=443

KUBERNETES_PORT=tcp://10.10.10.1:443

MY_SERVICE_PORT_80_TCP=tcp://10.10.10.212:80

MY_SERVICE_PORT_443_TCP_ADDR=10.10.10.212

NGINX_SERVICE_PORT_88_TCP_ADDR=10.10.10.85

HOSTNAME=busybox

/ # echo ${MY_SERVICE_SERVICE_HOST}

10.10.10.212

/ # echo ${MY_SERVICE_SERVICE_PORT}

80

service暴露端口发布服务

[root@k8s-master ~]# vim nginx-service.yaml

apiVersion: v1

kind: Service

metadata:

name: nginx-service

labels:

app: nginx

spec:

selector:

app: nginx

role: web

ports:

- name: http

port: 8080

protocol: TCP

targetPort: 80

type: NodePort

[root@k8s-master ~]# vim nginx-deployment.yaml

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

name: nginx-deployment

spec:

replicas: 3

template:

metadata:

labels:

app: nginx

role: web

spec:

containers:

- name: nginx

image: nginx:1.10

ports:

- containerPort: 80

[root@k8s-master ~]# kubectl create -f nginx-deployment.yaml

[root@k8s-master ~]# kubectl create -f nginx-service.yaml

暴露内部端口为10.10.10.239:8080

对外暴露端口为192.168.30.22:44860

[root@k8s-master ~]# kubectl get svc

nginx-service   NodePort    10.10.10.239   <none>        8080:44860/TCP

[root@k8s-node1 ~]# curl 10.10.10.239:8080

<!DOCTYPE html>

<html>

<head>

<title>Welcome to nginx!</title>

[root@k8s-node2 ~]# curl 10.10.10.239:8080

<!DOCTYPE html>

<html>

<head>

<title>Welcome to nginx!</title>