Krew plugin on ppc64le

Posted to https://community.ibm.com/community/user/powerdeveloper/blogs/paul-bastide/2023/07/19/kubernetes-krew-plugin-support-for-power?CommunityKey=daf9dca2-95e4-4b2c-8722-03cd2275ab63

Hey everyone,

Krew, the kubectl plugin package manager, is now available on Power. The release v0.4.4 has a ppc64le download. You can download and start taking advantage of the krew plugin list. ppc64le download It also works with OpenShift.

The Krew website has a list of plugins](https://krew.sigs.k8s.io/plugins/). Not all of the plugins support ppc64le, however may are cross-arch scripts and are cross compiled such as view-utilization.

To take advantage of Krew with OpenShift, here are a few steps

1. Download the krew-linux plugin

# curl -L -O https://github.com/kubernetes-sigs/krew/releases/download/v0.4.4/krew-linux_ppc64le.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 3977k  100 3977k    0     0  6333k      0 --:--:-- --:--:-- --:--:-- 30.5M

2. Extract the krew plugin

tar xvf krew-linux_ppc64le.tar.gz 
./LICENSE
./krew-linux_ppc64le

3. Move to the /usr/bin so it’s picked up by oc.

mv krew-linux_ppc64le /usr/bin/kubectl-krew

4. Update the krew plugin

# kubectl krew update
WARNING: To be able to run kubectl plugins, you need to add
the following to your ~/.bash_profile or ~/.bashrc:

    export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"

and restart your shell.

Adding "default" plugin index from https://github.com/kubernetes-sigs/krew-index.git.
Updated the local copy of plugin index.

5. Update your shell:

# echo 'export PATH="${KREW_ROOT:-$HOME/.krew}/bin:$PATH"' >> ~/.bashrc

6. Restart your session (exit and come back to the shell so the variables are loaded)
7. Try oc krew list

# oc krew list
PLUGIN  VERSION

8. List all the plugins that support ppc64le.

# oc krew search  | grep -v 'unavailable on linux/ppc64le'
NAME                            DESCRIPTION                                         INSTALLED
allctx                          Run commands on contexts in your kubeconfig         no
assert                          Assert Kubernetes resources                         no
bulk-action                     Do bulk actions on Kubernetes resources.            no
...
tmux-exec                       An exec multiplexer using Tmux                      no
view-utilization                Shows cluster cpu and memory utilization            no

9. Install a plugin

# oc krew install view-utilization
Updated the local copy of plugin index.
Installing plugin: view-utilization
Installed plugin: view-utilization
\
 | Use this plugin:
 |      kubectl view-utilization
 | Documentation:
 |      https://github.com/etopeter/kubectl-view-utilization
 | Caveats:
 | \
 |  | This plugin needs the following programs:
 |  | * bash
 |  | * awk (gawk,mawk,awk)
 | /
/
WARNING: You installed plugin "view-utilization" from the krew-index plugin repository.
   These plugins are not audited for security by the Krew maintainers.
   Run them at your own risk.

10. Use the plugin.

# oc view-utilization
Resource     Requests  %Requests      Limits  %Limits  Allocatable  Schedulable         Free
CPU              7521         16        2400        5        45000        37479        37479
Memory    33477885952         36  3774873600        4  92931489792  59453603840  59453603840

Tip: There are many more plugins with ppc64le support and do not have the krew manifest updated.

Thanks to PR 755 we have support for ppc64le.

References

https://github.com/kubernetes-sigs/krew/blob/v0.4.4/README.md

https://github.com/kubernetes-sigs/krew/releases/download/v0.4.4/krew-linux_ppc64le.tar.gz