在实验之前,我们都知道,lable是k8s中内部找寻各个资源的依据,比如deployment需要跟那个pod资源进行绑定,通过lable。service资源如何跟pod资源进行绑定,通过lable。service资源如何跟service资源进行绑定,通过lable。

总结:

vi deploy.yaml

apiVersion: apps/v1
kind: Deployment
metadata:                       
  name: nginx-dp      # (1)定义此Deployment资源的名字是nginx-dp,在 kubectl get deploy 中的 name 显示的名字,包括kubectl get pod 中
                       的name也是显示的此名字,这里有疑问,为什么不显示如下spec.template.spec.containers中的name: nginx,因为你是定义在deployment资源下
  namespace: default  # 在那个命名空间下,定义的资源都在此资源下,否则无法找到其他资源
  labels:             # (2)定义此Deployment资源的lable,以便namespace: default下的其他的资源找lables是app: nginx-lable的delpoynebt资源
    app: nginx-lable  # lables的名字app: nginx-lable
spec:
  selector:           # (3)此位置是选择标签,意思是此Deployment资源跟那个pod资源进行绑定
    matchLabels:
      app: nginx-1.7.9  # 此位置必须填写的是pod资源的label,也就是(4)
  replicas: 1
----------------------
  template:           # 元数据,开始定义pod
    metadata:
      labels:         # (4)定义pod资源的labels
        app: nginx-1.7.9
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

总结:
(1) 是kubectl get deploy 包括 kubectl get pod 中名字
(2) 定义的此Deployment资源的lable
(3) 选择标签,此Deployment资源跟那个pod资源进行绑定,写pod资源的label,也就是(4)
(4) 定义pod资源的labels

[root@hdss7-21 ~]# kubectl get deployment -owide
NAME       READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES        SELECTOR
nginx-dp   1/1     1            1           10m   nginx        nginx:1.7.9   app=nginx-1.7.9
[root@hdss7-21 ~]# kubectl get pod -owide
NAME                        READY   STATUS             RESTARTS   AGE   IP           NODE                NOMINATED NODE   READINESS GATES
nginx-dp-7cbfbcdc75-rvq2s   1/1     Running            0          10m   172.7.21.4   hdss7-21.host.com   <none>           <none>

[root@hdss7-21 ~]# curl 172.7.21.4
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[root@hdss7-21 ~]# 

vi svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx-svc   # (5)定义此Service资源的的名字是啥
  namespace: default    # 定义此service资源所在的名称空间,必须跟dedployment资源、pod资源在同一个名称空间下
  labels:       # 定义此servcice资源的lables,以便namespace: default下的其他的资源找lables是app: nodeport-lable的
    app: nginx-svc-label
spec:
  selector:   # (6)标签选择器,选择要跟那个pod资源进行绑定,是pod资源label名称
    app: nginx-1.7.9
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80

总结:

(6) 一定要跟pod资源的label相同,也就是(4),而不是(2),deployment资源,因为访问service资源,代理的是后端的pod。

[root@hdss7-21 ~]# kubectl get svc -owide
NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)   AGE    SELECTOR
kubernetes   ClusterIP   192.168.0.1      <none>        443/TCP   115d   <none>
nginx-svc    ClusterIP   192.168.58.8     <none>        80/TCP    8m6s   app=nginx-1.7.9

[root@hdss7-11 ~]# vi /var/named/od.com.zone

$ORIGIN od.com.
$TTL 600        ; 10 minutes
@               IN SOA  dns.od.com. dnsadmin.od.com. (
                                2020010501 ; serial
                                10800      ; refresh (3 hours)
                                900        ; retry (15 minutes)
                                604800     ; expire (1 week)
                                86400      ; minimum (1 day)
                                )
                                NS   dns.od.com.
$TTL 60 ; 1 minute
dns                A    10.4.7.11
nginx              A    10.4.7.10

[root@hdss7-11 ~]# systemctl restart named
[root@hdss7-11 ~]# dig -t A nginx.od.com +short @10.4.7.11
10.4.7.10

vi ingress.yaml

kind: Ingress
apiVersion: extensions/v1beta1
metadata: 
  name: nginx-ingress
  namespace: default
  labels:
    app: nginx-ingress-label
spec:
  rules:
  - host: nginx.od.com
    http:
      paths:
      - path: /
        backend: 
          serviceName: nginx-svc   # 选择Service资源的的名字
          servicePort: 80
[root@hdss7-21 ~]# curl nginx.od.com
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
    body {
        width: 35em;
        margin: 0 auto;
        font-family: Tahoma, Verdana, Arial, sans-serif;
    }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

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