In Kubernetes Cluster, you may encounter error similar to group map[(...)] is already registered when trying to perform any actions using kubectl
Check the kubectl Client Version and Kubernetes Server Version, make sure if the release version is same for Client and Server. The issue occurs when Client version is older than Server version.
You can use # kubectl version command to check the Client and Server version.
Either update the kubectl client to latest version (or) update it to same version as Server.
For installing latest version of kubectl, refer: https://kubernetes.io/docs/tasks/tools/install-kubectl/
Scenario:
Check the kubectl Client Version and Kubernetes Server Version, make sure if the release version is same for Client and Server. The issue occurs when Client version is older than Server version.
You can use # kubectl version command to check the Client and Server version.
Solution:
Either update the kubectl client to latest version (or) update it to same version as Server.
For installing latest version of kubectl, refer: https://kubernetes.io/docs/tasks/tools/install-kubectl/
Version mismatch
[root@localhost ~]# /bin/kubectl version
Client Version: version.Info{Major:"1", Minor:"4", GitVersion:"v1.4.0", GitCommit:"a16c0a7f71a6f93c7e0f222d961f4675cd97a46b", GitTreeState:"clean", BuildDate:"2016-09-26T18:16:57Z", GoVersion:"go1.6.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.6+a08f5eeb62", GitCommit:"c84beff", GitTreeState:"clean", BuildDate:"2017-12-06T20:03:39Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
[root@localhost ~]# /bin/kubectl get ep
error: group map[autoscaling:0xc8203bd0a0 componentconfig:0xc8203bd340 extensions:0xc82012ae00 kibana.com:0xc8202f09a0 :0xc8203bce00 apps:0xc8203bce70 policy:0xc820052070 rbac.authorization.k8s.io:0xc820052150 storage.k8s.io:0xc8200521c0 build.openshift.io:0xc8202f08c0 federation:0xc8203bc930 user.openshift.io:0xc8202f0930 apiregistration.k8s.io:0xc8202f0a10 authorization.k8s.io:0xc8203bd030 batch:0xc8203bd260 certificates.k8s.io:0xc8203bd2d0 authentication.k8s.io:0xc8203bcee0] is already registered
After upgrading Kubectl Client
[root@localhost ~]# /usr/local/bin/kubectl version
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.4", GitCommit:"5ca598b4ba5abb89bb773071ce452e33fb66339d", GitTreeState:"clean", BuildDate:"2018-06-06T08:13:03Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.6+a08f5eeb62", GitCommit:"c84beff", GitTreeState:"clean", BuildDate:"2017-12-06T20:03:39Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
[root@localhost ~]# /usr/local/bin/kubectl get ep
No resources found.
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