情况:v2 namespace需要访问default namespace的rabbitmq服务 解决办法:在v2 namespace里面创建service,不指定selector, 采用type=ExternalName的方式,externalName定义成为指向namespace=default中的rabbitmq-service [root@bdy-master1]# kubectl create -f rabbitmq.yaml [root@bdy-master1]# kubectl get service -A |grep rabbit default rabbitmq ClusterIP None <none> 5672/TCP 108d default rabbitmq-service NodePort 10.254.252.174 <none> 15672:32001/TCP,5672:32002/TCP 115d v2 rabbitmq ExternalName <none> rabbitmq.default.svc.cluster.local 5672/TCP 25h 测试是否可以跨namespace访问 [root@bdy-master1 rabbitmq-service]# kubectl exec -it -n v2 api-57596df5b8-sx2hc sh /var/www/html # nslookup rabbitmq nslookup: can’t resolve ‘(null)’: Name does not resolve Name: rabbitmq Address 1: 172.30.28.24 172-30-28-24.rabbitmq.default.svc.cluster.local Address 2: 172.30.3.4 rabbitmq-1.rabbitmq.default.svc.cluster.local Address 3: 172.30.43.8 172-30-43-8.rabbitmq.default.svc.cluster.local Address 4: 172.30.43.2 rabbitmq-2.rabbitmq.default.svc.cluster.local Address 5: 172.30.3.30 172-30-3-30.rabbitmq.default.svc.cluster.local Address 6: 172.30.28.2 rabbitmq-0.rabbitmq.default.svc.cluster.local /var/www/html # ping rabbitmq PING rabbitmq (172.30.43.2): 56 data bytes 64 bytes from 172.30.43.2: seq=0 ttl=62 time=0.720 ms 64 bytes from 172.30.43.2: seq=1 ttl=62 time=0.650 ms ^C — rabbitmq ping statistics — 2 packets transmitted, 2 packets received, 0% packet loss round-trip min/avg/max = 0.650/0.685/0.720 ms /var/www/html # nc -n -v rabbitmq 5672 rabbitmq (172.30.43.2:5672) open ^[[A^Cpunt!
# vi rabbitmq.yaml apiVersion: v1 kind: Service metadata: name: rabbitmq namespace: v2 spec: ports: - port: 5672 name: amqp sessionAffinity: None type: ExternalName externalName: rabbitmq.default.svc.cluster.local
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