Allow a wildcard in identifying a name (shown with an example)

[mpattani]

Enhancement Description

Allow a wildcard (* OR %) for long podnames for those who do not like to do copy/paste

Here is my example i am talking about:

I only have two pods, but they have long names. Instead of doing copy/paste of the whole podname, I would like
to have to get the whole name by using a wild card-

Here is my scenerio

++++++++++++

[sysadmin@localhost mp_k8s_exercise]$ kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
helloworld-cc47658f5-zs9nq 1/1 Running 0 17d 10.1.102.152 localhost.localdomain
nginx-webserver-7fc8bbdbb7-twmhg 1/1 Running 0 18d 10.1.102.148 localhost.localdomain
[sysadmin@localhost mp_k8s_exercise]$
[sysadmin@localhost mp_k8s_exercise]$
[sysadmin@localhost mp_k8s_exercise]$ kubectl exec nginx* -- cat /etc/hosts
Error from server (NotFound): pods "nginx*" not found
[sysadmin@localhost mp_k8s_exercise]$
[sysadmin@localhost mp_k8s_exercise]$ kubectl exec nginx-webserver-* -- cat /etc/hosts
Error from server (NotFound): pods "nginx-webserver-*" not found
[sysadmin@localhost mp_k8s_exercise]$
[sysadmin@localhost mp_k8s_exercise]$ kubectl exec nginx-webserver-7fc8bbdbb7-twmhg -- cat /etc/hosts

Kubernetes-managed hosts file.

127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
fe00::0 ip6-mcastprefix
fe00::1 ip6-allnodes
fe00::2 ip6-allrouters
10.1.102.148 nginx-webserver-7fc8bbdbb7-twmhg
[sysadmin@localhost mp_k8s_exercise]$ pwd
/home/sysadmin/mp_k8s_exercise
[sysadmin@localhost mp_k8s_exercise]$

+++++++++++++

What I would have liked to see is if i could what i was trying to do earlier:

---

[sysadmin@localhost mp_k8s_exercise]$ kubectl exec nginx* -- cat /etc/hosts (* for all chars following nginx*) (% for single char )
Error from server (NotFound): pods "nginx*" not found
[sysadmin@localhost mp_k8s_exercise]$
[sysadmin@localhost mp_k8s_exercise]$ kubectl exec nginx-webserver-* -- cat /etc/hosts
Error from server (NotFound): pods "nginx-webserver-*" not found
[sysadmin@localhost mp_k8s_exercise]$

---

I should be able to use a wild card like (* for all chars - and % for single char) to get the rest of the podname -

As far as there is no conflict, kubectl should be able to give me and identify long podnames by using wildcard.

I believe this will be beneficial to all kubectl users - not just me who is not always comfortable doing copy/paste.

I hope this reaches to the right team.

Regards
MPattani

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[sftim]

I think the best home for this is as a kubectl feature request @mpattani

/transfer kubectl

[k8s-ci-robot]

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[sftim]

/sig cli
/kind feature

[sftim]

• we recommend using labels to select multiple Pods
• could an out-of-tree plugin help exec the same command across multiple Pods matching a label?