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  • kubernetes云平台管理实战: 自动加载到负载均衡(七)

    一、如何实现外界能访问

    外界访问不了

    1、启动svc

    [root@k8s-master ~]# cat myweb-svc.yaml 
    apiVersion: v1
    kind: Service
    metadata:
      name: nginx
    spec:
      type: NodePort
      ports:
        - port: 80
          nodePort: 30001
      selector:
        app: myweb    
    [root@k8s-master ~]# kubectl create -f myweb-svc.yaml 
    service "nginx" created

    2、查看svc状态

    [root@k8s-master ~]# kubectl get all
    NAME       DESIRED   CURRENT   READY     AGE
    rc/myweb   3         3         3         19m
    
    NAME             CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE
    svc/kubernetes   10.254.0.1       <none>        443/TCP        22h
    svc/nginx        10.254.205.175   <nodes>       80:30001/TCP   27s
    
    NAME             READY     STATUS    RESTARTS   AGE
    po/myweb-7m76h   1/1       Running   0          18m
    po/myweb-kzq8c   1/1       Running   0          18m
    po/myweb-mnf7x   1/1       Running   0          18m

    3、被外界访问原理图

     

    二、为什么是30001?

    1、修改为3000看看是否正常?

    [root@k8s-master ~]# vim myweb-svc.yaml
    更改端口为:3000
    [root@k8s-master ~]# kubectl delete svc/nginx
    service "nginx" deleted
    [root@k8s-master ~]# kubectl create -f myweb-svc.yaml 
    The Service "nginx" is invalid: spec.ports[0].nodePort: Invalid value: 3000: 
    provided port is not in the valid range. The range of valid ports is 30000-32767
    

    2、端口更改为30001

    [root@k8s-master ~]# vim myweb-svc.yaml 
    更改端口为:30001
    [root@k8s-master ~]# kubectl create -f myweb-svc.yaml 
    service "nginx" created
    [root@k8s-master ~]# kubectl get all
    NAME       DESIRED   CURRENT   READY     AGE
    rc/myweb   3         3         3         25m
    
    NAME             CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
    svc/kubernetes   10.254.0.1      <none>        443/TCP        22h
    svc/nginx        10.254.145.15   <nodes>       80:30027/TCP   8s
    
    NAME             READY     STATUS    RESTARTS   AGE
    po/myweb-7m76h   1/1       Running   0          24m
    po/myweb-kzq8c   1/1       Running   0          24m
    po/myweb-mnf7x   1/1       Running   0          25m
    

    默认不填写,自动分配30000-32767内任意一端口

    三、自动加载到负载均衡里面

    1、修改svc副本数为1

    [root@k8s-master ~]# kubectl get pod -o wide
    NAME          READY     STATUS    RESTARTS   AGE       IP            NODE
    myweb-7m76h   1/1       Running   0          26m       172.16.10.2   k8s-node1
    myweb-kzq8c   1/1       Running   0          26m       172.16.48.4   k8s-node2
    myweb-mnf7x   1/1       Running   0          26m       172.16.48.2   k8s-node2
    
    
    [root@k8s-master ~]# kubectl edit rc myweb
      replicas: 1 
    replicationcontroller "myweb" edited
    
    [root@k8s-master ~]# kubectl get pod -o wide
    NAME          READY     STATUS    RESTARTS   AGE       IP            NODE
    myweb-mnf7x   1/1       Running   0          28m       172.16.48.2   k8s-node2
    [root@k8s-master ~]# kubectl  describe svc nginx
    Name:			nginx
    Namespace:		default
    Labels:			<none>
    Selector:		app=myweb
    Type:			NodePort
    IP:			10.254.145.15
    Port:			<unset>	80/TCP
    NodePort:		<unset>	30027/TCP
    Endpoints:		172.16.48.2:80
    Session Affinity:	None
    No events.
    

    2、修改svc副本数为5

    [root@k8s-master ~]# kubectl edit rc myweb
      replicas: 5
    replicationcontroller "myweb" edited
    [root@k8s-master ~]# kubectl  describe svc nginx
    Name:			nginx
    Namespace:		default
    Labels:			<none>
    Selector:		app=myweb
    Type:			NodePort
    IP:			10.254.145.15
    Port:			<unset>	80/TCP
    NodePort:		<unset>	30027/TCP
    Endpoints:		172.16.10.2:80,172.16.10.3:80,172.16.48.2:80 + 1 more...
    Session Affinity:	None
    No events.
    [root@k8s-master ~]# kubectl get pod -o wide
    NAME          READY     STATUS    RESTARTS   AGE       IP            NODE
    myweb-415zs   1/1       Running   0          9s        172.16.48.3   k8s-node2
    myweb-7bw5f   1/1       Running   0          9s        172.16.10.3   k8s-node1
    myweb-7kzh2   1/1       Running   0          9s        172.16.48.4   k8s-node2
    myweb-j45xb   1/1       Running   0          9s        172.16.10.2   k8s-node1
    myweb-mnf7x   1/1       Running   0          30m       172.16.48.2   k8s-node2

     四、上网测试截图

    1、node1 web截图

    2、node2 web截图

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  • 原文地址:https://www.cnblogs.com/luoahong/p/10300385.html
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