k8s 跨namespace通信

[[email protected] kafka-mirror]# kubectl get pod --all-namespaces
NAMESPACE     NAME                                                       READY   STATUS    RESTARTS        AGE
default       loganalysis-kafka-0                                        0/1     Running   3 (39s ago)     2m56s
...
loganalysis   kafka-0                                                    1/1     Running   4 (2d3h ago)    6d1h
loganalysis   kafka-1                                                    1/1     Running   3 (2d3h ago)    6d1h
loganalysis   kafka-2                                                    1/1     Running   3 (2d3h ago)    6d1h
loganalysis   kafka-zookeeper-0                                          1/1     Running   0               6d1h
loganalysis   kafka-zookeeper-1                                          1/1     Running   0               6d1h
loganalysis   kafka-zookeeper-2                                          1/1     Running   1 (5d10h ago)   6d1h


[[email protected] kafka-mirror]# kubectl get svc --all-namespaces
NAMESPACE     NAME                                         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
default       loganalysis-kafka                            ClusterIP   10.1.54.242    <none>        9092/TCP                     3m15s
default       loganalysis-kafka-headless                   ClusterIP   None           <none>        9092/TCP                     3m15s
...
loganalysis   kafka-headless                               ClusterIP   None           <none>        9092/TCP                     6d1h
loganalysis   kafka-zookeeper                              ClusterIP   10.1.138.27    <none>        2181/TCP                     6d1h
loganalysis   kafka-zookeeper-headless                     ClusterIP   None           <none>        2181/TCP,3888/TCP,2888/TCP   6d1h

###### 跨namespace ######

[[[email protected] kafka-mirror]# kubectl exec -it loganalysis-kafka-0 -- ping kafka-headless.loganalysis
PING kafka-headless.loganalysis.svc.cluster.local (10.244.2.5) 56(84) bytes of data.
64 bytes from 10-244-2-5.kafka.loganalysis.svc.cluster.local (10.244.2.5): icmp_seq=1 ttl=64 time=0.104 ms
64 bytes from 10-244-2-5.kafka.loganalysis.svc.cluster.local (10.244.2.5): icmp_seq=2 ttl=64 time=0.077 ms
^C
--- kafka-headless.loganalysis.svc.cluster.local ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1016ms
rtt min/avg/max/mdev = 0.077/0.090/0.104/0.016 ms
[[email protected] kafka-mirror]#

可以看到namespace：default的 loganalysis-kafka-0 能 ping 通 namespace：loganalysis的 kafka-headless svc

参考：https://www.cnblogs.com/lori/p/12054069.html