需求：需要两个不同的namespace之间的不同pod可以通过name的形式访问
1：创建A名称空间的pod
[[email protected] lihongxing]# cat myapp.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp
namespace: cjy-test
spec:
replicas: 1
selector: #标签选择器
matchLabels: #匹配的标签为
app: myapp
release: canary
template:
metadata:
labels:
app: myapp #和上面的myapp要匹配
release: canary
spec:
containers:
- name: myapp
image: ikubernetes/myapp:v1
ports:
- name: http
containerPort: 80
2：创建无头service
[[email protected] lihongxing]# cat myapp-svc-headless.yaml
apiVersion: v1
kind: Service
metadata:
name: myapp-svc
namespace: cjy-test
spec:
selector:
app: myapp #挑选的pod还是myapp。一个pod可以有多个service
release: canary
clusterIP: None #None表示是无头service
ports:
- port: 39320 #service ip中的端口
targetPort: 80 #容器ip中的端口
3：创建ExternalName
[[email protected] lihongxing]# cat myapp-svc-extername.yaml kind: Service apiVersion: v1 metadata: name: myapp-svcname namespace: cjy-test spec: type: ExternalName externalName: myapp-svc.cjy2-test.svc.cluster.local
在另一个名称空间的创建方式同上三步
两个名称空间都做完后，验证
[[email protected] ~]# kubectl get pods -n cjy-test NAME READY STATUS RESTARTS AGE myapp-deploy-f4db5d79c-zdgvv 1/1 Running 0 116m myapp-f4db5d79c-xfs9l 1/1 Running 0 47m [[email protected] ~]# kubectl exec -it myapp-f4db5d79c-xfs9l -n cjy-test -- /bin/sh / # nslookup myapp-svcname nslookup: can‘t resolve ‘(null)‘: Name does not resolve Name: myapp-svcname Address 1: 172.16.129.11 172-16-129-11.maypp.cjy2-test.svc.cluster.local / # ping myapp-svcname PING myapp-svcname (172.16.129.11): 56 data bytes 64 bytes from 172.16.129.11: seq=0 ttl=64 time=0.534 ms ^C --- myapp-svcname ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max = 0.534/0.534/0.534 ms / # nslookup myapp-svc.cjy2-test.svc.cluster.local nslookup: can‘t resolve ‘(null)‘: Name does not resolve Name: myapp-svc.cjy2-test.svc.cluster.local Address 1: 172.16.129.11 172-16-129-11.maypp.cjy2-test.svc.cluster.local / # exit command terminated with exit code 127 [[email protected] ~]# kubectl get pods -n cjy2-test -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES myapp-f4db5d79c-6mpsm 1/1 Running 0 50m 172.16.129.11 k8s-w1.sai.corp <none> <none> [[email protected] ~]# kubectl get svc -n cjy2-test -o wide NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR maypp ClusterIP 172.16.135.109 <none> 6381/TCP 101m app=myapp myapp-svc ClusterIP None <none> 39321/TCP 55m app=myapp,release=canary [[email protected] ~]# kubectl get svc -n cjy-test NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE maypp ClusterIP 172.16.134.116 <none> 6380/TCP 105m myapp-svc ClusterIP None <none> 39320/TCP 69m myapp-svcname ExternalName <none> myapp-svc.cjy2-test.svc.cluster.local <none> 62m
原文地址：https://www.cnblogs.com/dribs/p/11676768.html
时间： 2024-08-30 16:53:47