其他 - 在Kubernetes中，如何在服务选择器中按名称选择Pod？

您还可以使用一个选项来定义不包含容器选择器的服务。然后通过手动添加Endpoint对象将服务手动映射到运行该服务的网络地址和端口。

供您参考的示例：

创建了两个类型为nginx的Pod

$ kubectl get all -o wide
NAME            READY   STATUS    RESTARTS   AGE     IP               NODE         NOMINATED NODE   READINESS GATES
pod/nginx-one   1/1     Running   0          4m56s   192.168.58.199   k8s-node02   <none>           <none>
pod/nginx-two   1/1     Running   0          4m50s   192.168.85.193   k8s-node01   <none>           <none>

NAME                        TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE     SELECTOR
service/kubernetes          ClusterIP   10.96.0.1       <none>        443/TCP   29m     <none>

使用下面的Yaml创建两个服务，注意下面的Yaml上未使用Pod选择器字段

service1.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx-one-service
spec:
  ports:
    - protocol: TCP
      port: 80

service2.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx-two-service
spec:
  ports:
    - protocol: TCP
      port: 80


$ kubectl get svc
NAME                TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
kubernetes          ClusterIP   10.96.0.1       <none>        443/TCP   32m
nginx-one-service   ClusterIP   10.102.230.78   <none>        80/TCP    7m16s
nginx-two-service   ClusterIP   10.98.86.67     <none>        80/TCP    6m56s

描述服务，因为没有选择器，所以没有端点映射。

ubuntu@k8s-master:~$ kubectl describe service nginx-one-service
Name:              nginx-one-service
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          <none>
Type:              ClusterIP
IP:                10.102.230.78
Port:              <unset>  80/TCP
TargetPort:        80/TCP
Endpoints:         <none>
Session Affinity:  None
Events:            <none>

ubuntu@k8s-master:~$ kubectl describe service nginx-two-service
Name:              nginx-two-service
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          <none>
Type:              ClusterIP
IP:                10.98.86.67
Port:              <unset>  80/TCP
TargetPort:        80/TCP
Endpoints:         <none>
Session Affinity:  None
Events:            <none>

现在，您可以选择使用以下Yamls手动映射终点。

endpoint1.yaml

apiVersion: v1
kind: Endpoints
metadata:
  name: nginx-one-service
subsets:
  - addresses:
      - ip: 192.168.85.193
    ports:
      - port: 80

endpoint2.yaml

apiVersion: v1
kind: Endpoints
metadata:
  name: nginx-two-service
subsets:
  - addresses:
      - ip: 192.168.85.193
    ports:
      - port: 80

现在获取创建端点

$ kubectl get endpoints
NAME                ENDPOINTS             AGE
kubernetes          131.160.188.46:6443   35m
nginx-one-service   192.168.58.199:80     5m30s
nginx-two-service   192.168.85.193:80     4m59s

并列出服务和端点应按以下方式映射

ubuntu@k8s-master:~$ kubectl describe service nginx-one-service
Name:              nginx-one-service
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          <none>
Type:              ClusterIP
IP:                10.102.230.78
Port:              <unset>  80/TCP
TargetPort:        80/TCP
Endpoints:         192.168.58.199:80
Session Affinity:  None
Events:            <none>

ubuntu@k8s-master:~$ kubectl describe service nginx-two-service
Name:              nginx-two-service
Namespace:         default
Labels:            <none>
Annotations:       <none>
Selector:          <none>
Type:              ClusterIP
IP:                10.98.86.67
Port:              <unset>  80/TCP
TargetPort:        80/TCP
Endpoints:         192.168.85.193:80
Session Affinity:  None
Events:            <none>