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kube-ps1: add example for common pitfall (#8318 )

I ran into this issue, looks like maybe a few other people did as well.

https://github.com/jonmosco/kube-ps1/issues/28#issuecomment-359761463
A simple clarification seems helpful.

2020-02-10 20:31:55 +01:00

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Kubernetes prompt for zsh

A Kubernetes zsh prompt that displays the current cluster cluster
and the namespace.

Inspired by several tools used to simplify usage of kubectl

NOTE: If you are not using zsh, check out kube-ps1
designed for bash as well as zsh.

Requirements

The default prompt assumes you have the kubectl command line utility installed. It
can be obtained here:

Install and Set up kubectl

If using this with OpenShift, the oc tool needs installed. It can be obtained from here:

OC Client Tools

Helper utilities

There are several great tools that make using kubectl very enjoyable.

kubectx and kubenx are great for
fast switching between clusters and namespaces.

Prompt Structure

The prompt layout is:

(<symbol>|<cluster>:<namespace>)

Enabling

In order to use kube-ps1 with Oh My Zsh, you'll need to enable them in the
.zshrc file. You'll find the zshrc file in your $HOME directory. Open it with
your favorite text editor and you'll see a spot to list all the plugins you
want to load.

vim $HOME/.zshrc

Add kube-ps1 to the list of enabled plugins and enable it on the prompt:

plugins=(
  git
  kube-ps1
)

# After the "source Oh My Zsh" line
PROMPT=$PROMPT'$(kube_ps1) '
# Or in double quotes, don't forget to escape
PROMPT=$PROMPT"\$(kube_ps1) "

Note: The PROMPT example above was tested with the theme robbyrussell.

Enabling / Disabling on the current shell

Sometimes the kubernetes information can be anoying, you can easily
switch it on and off with the following commands:

kubeon

kubeoff

Colors

Blue was used as the prefix to match the Kubernetes color as closely as
possible. Red was chosen as the cluster name to stand out, and cyan
for the namespace. Check the customization section for changing them.

Customization

The default settings can be overridden in ~/.zshrc

Variable	Default	Meaning
`KUBE_PS1_BINARY`	`kubectl`	Default Kubernetes binary
`KUBE_PS1_PREFIX`	`(`	Prompt opening character
`KUBE_PS1_SYMBOL_ENABLE`	`true`	Display the prompt Symbol. If set to `false`, this will also disable `KUBE_PS1_SEPARATOR`
`KUBE_PS1_SYMBOL_DEFAULT`	`⎈`	Default prompt symbol. Unicode `\u2388`
`KUBE_PS1_SYMBOL_USE_IMG`	`false`	☸️ , Unicode `\u2638` as the prompt symbol
`KUBE_PS1_NS_ENABLE`	`true`	Display the namespace. If set to `false`, this will also disable `KUBE_PS1_DIVIDER`
`KUBE_PS1_SEPERATOR`	`\|`	Separator between symbol and cluster name
`KUBE_PS1_DIVIDER`	`:`	Separator between cluster and namespace
`KUBE_PS1_SUFFIX`	`)`	Prompt closing character
`KUBE_PS1_COLOR_SYMBOL`	`"%F{blue}"`	Custom color for the symbol
`KUBE_PS1_COLOR_CONTEXT`	`"%F{red}"`	Custom color for the context
`KUBE_PS1_COLOR_NS`	`"%F{cyan}"`	Custom color for the namespace
`KUBE_PS1_ENABLED`	`true`	Set to false to start disabled on any new shell, `kubeon`/`kubeoff` will flip this value on the current shell

Contributors

Jared Yanovich
Pedro Moranga

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