Kubens. DIY with FZF

In my work daily routine, I often need to switch between namespaces(less frequently contexts) in kubernetes and I used to use kubectx/kubens tools. Recently I started using FZF, mostly as a file finder and for fuzzy search in command line history.

I was wonder if I can apply FZF somewhere else. I tried to make my own kubens. What requirements do I have?

• show all namespaces for the current context
• select with fuzzy search
• switch to selected
• highlight current namespace (optional)

For intermediate scripts I use fish shell, a final script I show in fish shell and bash/zsh.

Show namespaces

Default kubectl command:

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kubectl get namespace

Select with fuzzy search

To select namespace we pipe previous command with FZF:

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kubectl get namespace | fzf

We have to get rid of headers and choose only namespace name column:

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kubectl get namespace --no-headers | fzf | awk '{ print $1}'

Swith to selected

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kubectl config set-context --current \
	--namespace=(kubectl get namespace \
	--no-headers | fzf | awk '{ print $1}')

bash/zsh:

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kubectl config set-context --current \ 
	--namespace=$(kubectl get namespace \
	--no-headers | fzf | awk '{ print $1}') 

Conclusion

We can add it to fish functions and invoke by name(knmps).

Add knmsp.fish to ~/.config/fish/functions/knmsp.fish

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function knmsp -d "run vim with fzf"
  kubectl config set-context --current \ 
  	--namespace=(kubectl get namespace \
  	--no-headers | fzf | awk '{ print $1}')
end