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241 lines
6.9 KiB
Markdown
241 lines
6.9 KiB
Markdown
kube-ps1: Kubernetes prompt for bash and zsh
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============================================
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A script that lets you add the current Kubernetes context and namespace
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configured on `kubectl` to your Bash/Zsh prompt strings (i.e. the `$PS1`).
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Inspired by several tools used to simplify usage of `kubectl`.
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## Installing
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### MacOS
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Homebrew package manager:
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```
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$ brew update
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$ brew install kube-ps1
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```
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### From Source
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1. Clone this repository
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2. Source the kube-ps1.sh in your `~/.zshrc` or your `~/.bashrc`
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### Arch Linux
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AUR Package available at [https://aur.archlinux.org/packages/kube-ps1/](https://aur.archlinux.org/packages/kube-ps1/).
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#### Zsh
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```sh
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source /path/to/kube-ps1.sh
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PROMPT='$(kube_ps1)'$PROMPT
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```
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#### Bash
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```sh
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source /path/to/kube-ps1.sh
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PS1='[\u@\h \W $(kube_ps1)]\$ '
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```
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### Zsh Plugin Managers
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#### Using [zplugin](https://github.com/zdharma/zplugin)
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Update `.zshrc` with:
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```sh
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zplugin light jonmosco/kube-ps1
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PROMPT='$(kube_ps1)'$PROMPT
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```
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## Requirements
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The default prompt assumes you have the `kubectl` command line utility installed.
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Official installation instructions and binaries are available:
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[Install and Set up kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/)
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If using this with OpenShift, the `oc` tool needs installed. It can be obtained
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from brew ports:
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```
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brew install openshift-cli
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```
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or the source can be downloaded:
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[OC Client Tools](https://www.openshift.org/download.html)
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Set the binary to `oc` with the following environment variable:
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```
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KUBE_PS1_BINARY=oc
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```
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If neither binary is available, the prompt will print the following:
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```
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(<symbol>|BINARY-N/A:N/A)
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```
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## Helper utilities
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There are several great tools that make using kubectl very enjoyable:
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- [`kubectx` and `kubens`](https://github.com/ahmetb/kubectx) are great for
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fast switching between clusters and namespaces.
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## Tmux port
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I have begun porting kube-ps1 to tmux as a status line plugin. If you prefer
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tmux, and like the functionality provided by kube-ps1, checkout the
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[kube-tmux](https://github.com/jonmosco/kube-tmux) project
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## Prompt Structure
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The default prompt layout is:
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```
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(<symbol>|<context>:<namespace>)
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```
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If the current-context is not set, kube-ps1 will return the following:
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```
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(<symbol>|N/A:N/A)
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```
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## Enabling/Disabling
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If you want to stop showing Kubernetes status on your prompt string temporarily
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run `kubeoff`. To disable the prompt for all shell sessions, run `kubeoff -g`.
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You can enable it again in the current shell by running `kubeon`, and globally
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with `kubeon -g`.
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```
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kubeon : turn on kube-ps1 status for this shell. Takes precedence over
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global setting for current session
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kubeon -g : turn on kube-ps1 status globally
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kubeoff : turn off kube-ps1 status for this shell. Takes precedence over
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global setting for current session
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kubeoff -g : turn off kube-ps1 status globally
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```
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## Customization
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The default settings can be overridden in `~/.bashrc` or `~/.zshrc` by setting
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the following environment variables:
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| Variable | Default | Meaning |
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| :------- | :-----: | ------- |
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| `KUBE_PS1_BINARY` | `kubectl` | Default Kubernetes binary |
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| `KUBE_PS1_NS_ENABLE` | `true` | Display the namespace. If set to `false`, this will also disable `KUBE_PS1_DIVIDER` |
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| `KUBE_PS1_PREFIX` | `(` | Prompt opening character |
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| `KUBE_PS1_SYMBOL_ENABLE` | `true ` | Display the prompt Symbol. If set to `false`, this will also disable `KUBE_PS1_SEPARATOR` |
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| `KUBE_PS1_SYMBOL_PADDING` | `false` | Adds a space (padding) after the symbol to prevent clobbering prompt characters |
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| `KUBE_PS1_SYMBOL_DEFAULT` | `⎈ ` | Default prompt symbol. Unicode `\u2388` |
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| `KUBE_PS1_SYMBOL_USE_IMG` | `false` | ☸️ , Unicode `\u2638` as the prompt symbol |
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| `KUBE_PS1_SEPARATOR` | | | Separator between symbol and context name |
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| `KUBE_PS1_DIVIDER` | `:` | Separator between context and namespace |
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| `KUBE_PS1_SUFFIX` | `)` | Prompt closing character |
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| `KUBE_PS1_CLUSTER_FUNCTION` | No default, must be user supplied | Function to customize how cluster is displayed |
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| `KUBE_PS1_NAMESPACE_FUNCTION` | No default, must be user supplied | Function to customize how namespace is displayed |
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For terminals that do not support UTF-8, the symbol will be replaced with the
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string `k8s`.
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To disable a feature, set it to an empty string:
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```
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KUBE_PS1_SEPARATOR=''
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```
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## Colors
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The default colors are set with the following environment variables:
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| Variable | Default | Meaning |
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| :------- | :-----: | ------- |
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| `KUBE_PS1_PREFIX_COLOR` | `null` | Set default color of the prompt prefix |
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| `KUBE_PS1_SYMBOL_COLOR` | `blue` | Set default color of the Kubernetes symbol |
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| `KUBE_PS1_CTX_COLOR` | `red` | Set default color of the context |
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| `KUBE_PS1_SUFFIX_COLOR` | `null` | Set default color of the prompt suffix |
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| `KUBE_PS1_NS_COLOR` | `cyan` | Set default color of the namespace |
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| `KUBE_PS1_BG_COLOR` | `null` | Set default color of the prompt background |
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Blue was used for the default symbol to match the Kubernetes color as closely
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as possible. Red was chosen as the context name to stand out, and cyan for the
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namespace.
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Set the variable to an empty string if you do not want color for each
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prompt section:
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```
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KUBE_PS1_CTX_COLOR=''
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```
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Names are usable for the following colors:
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```
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black, red, green, yellow, blue, magenta, cyan
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```
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256 colors are available by specifying the numerical value as the variable
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argument.
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## Customize display of cluster name and namespace
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You can change how the cluster name and namespace are displayed using the
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`KUBE_PS1_CLUSTER_FUNCTION` and `KUBE_PS1_NAMESPACE_FUNCTION` variables
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respectively.
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For the following examples let's assume the following:
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cluster name: `sandbox.k8s.example.com`
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namespace: `alpha`
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If you're using domain style cluster names, your prompt will get quite long
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very quickly. Let's say you only want to display the first portion of the
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cluster name (`sandbox`), you could do that by adding the following:
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```sh
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function get_cluster_short() {
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echo "$1" | cut -d . -f1
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}
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KUBE_PS1_CLUSTER_FUNCTION=get_cluster_short
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```
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The same pattern can be followed to customize the display of the namespace.
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Let's say you would prefer the namespace to be displayed in all uppercase
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(`ALPHA`), here's one way you could do that:
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```sh
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function get_namespace_upper() {
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echo "$1" | tr '[:lower:]' '[:upper:]'
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}
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export KUBE_PS1_NAMESPACE_FUNCTION=get_namespace_upper
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```
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In both cases, the variable is set to the name of the function, and you must have defined the function in your shell configuration before kube_ps1 is called. The function must accept a single parameter and echo out the final value.
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### Bug Reports and shell configuration
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Due to the vast ways of customizing the shell, please try the prompt with a
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minimal configuration before submitting a bug report.
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This can be done as follows for each shell before loading kube-ps1:
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Bash:
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```bash
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bash --norc
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```
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Zsh:
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```bash
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zsh -f
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or
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zsh --no-rcs
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```
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## Contributors
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* [Ahmet Alp Balkan](https://github.com/ahmetb)
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* Jared Yanovich
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