K8S/Kubernetes

1、clusterip

kind: Service
apiVersion: v1
metadata:
  name: my-service
spec:
  selector:
    app: nginx
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80

[root@k8s-master rc-test]# kubectl get svc
NAME         CLUSTER-IP      EXTERNAL-IP   PORT(S)    AGE
kubernetes   10.254.0.1      <none>        443/TCP    9d
my-service   10.254.233.44   <none>        80/TCP     16s
mysql        None            <none>        3306/TCP   8d

[root@k8s-master rc-test]# kubectl get ep
NAME ENDPOINTS AGE
kubernetes 192.168.137.110:6443 9d
my-service 172.168.69.2:80,172.168.95.2:80 9m
mysql 172.168.69.3:3306 8d

此种方式可以在k8s内部使用，比如建立一个busybox，在busybox上面，可以访问10.254.233.44

在node上面，也可以使用endpoint的ip访问，比如在master上面访问172.168.69.2

 

 

2、NodePort

kind: Service
apiVersion: v1
metadata:
name: my-service
spec:
type: NodePort
selector:
app: nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
nodePort: 30062

[root@k8s-master rc-test]# kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes 10.254.0.1 <none> 443/TCP 10d
my-service 10.254.209.157 <nodes> 80:30062/TCP 5m
mysql None <none> 3306/TCP 8d

[root@k8s-master rc-test]# kubectl get ep
NAME ENDPOINTS AGE
kubernetes 192.168.137.110:6443 10d
my-service 172.168.69.2:80,172.168.95.2:80 6m
mysql 172.168.69.3:3306 8d

相比clusterIP，多了一个node上面的接口，cluster的两种方式还是可以访问。

另外node IP方式也可以访问了。