kube-prompt

Simple and customizable PS1 utility to show Kubernetes current context information.

Requires: kubectl command available in PATH

Installation

curl -LO https://raw.githubusercontent.com/NeodymiumFerBore/kube-prompt/main/kube-prompt.sh

Usage

Before your PS1 definition, source kube-prompt.sh, then use __kube_ps1. Optionally, provide a format string to customize the output.

source /path/to/kube-prompt.sh

# Default output: (⎈|namespace)
export PS1='\u@\h \W $(__kube_ps1) \$ '

# With custom output: user@cluster:namespace:
export PS1='\u@\h \W $(__kube_ps1 "%u@%c:%n") \$ '

# Show only current context name
export PS1='\u@\h \W $(__kube_ps1 "%C") \$ '

# user@cluster:namespace with fancy colors
export PS1='\u@\h \W $(__kube_ps1 "\e[0;32m%u@%c\e[0m:\e[0;34m%n\e[0m") \$ '

Testing before using

You can use the testing/testing.sh script to show examples of __kube_ps1 usage.

$ cd testing/
$ export KUBECONFIG="$(pwd)"/kubeconfig

$ bash testing.sh
+ __kube_ps1
(⎈|frontend)

$ bash testing.sh 1
+ __kube_ps1 '[%C]'
[dev-frontend]

$ bash testing.sh 2
+ __kube_ps1 '%u@%c:%n'
developer@development:frontend

$ bash testing.sh 3 # Will render in bold blue
+ __kube_ps1 '\e[1;34m⎈|%n\e[0m'
⎈|frontend

To help building your new PS1, you can also provide custom format string:

bash testing.sh '\e[0;32m%u@%c\e[0m: \e[0;34m%n\e[0m'

my-user@my-cluster: my-namespace

Format

%u - current context user name
%n - current context namespace
%c - current context cluster name
%C - current context name

If %n is used and current context namespace is not set, "default" will be printed.