Kubectl get pods sorted and colored by node

kgpwc.sh

#!/bin/bash

# Script to display Kubernetes pods grouped and color-coded by node
kubectl get pods -o wide | sort -k7 | awk '
BEGIN {
    # Define ANSI color codes for groups
    colors[1] = "\033[1;31m"; # Red
    colors[2] = "\033[1;32m"; # Green
    colors[3] = "\033[1;33m"; # Yellow
    colors[4] = "\033[1;34m"; # Blue
    colors[5] = "\033[1;35m"; # Magenta
    colors[6] = "\033[1;36m"; # Cyan
    reset = "\033[0m";        # Reset color
}
NR == 1 { print; next }      # Print the header
{
    # Group by Node (column 7)
    node = $7;
    if (!(node in seen)) {
        seen[node] = ++count; # Assign a unique group ID for each node
    }
    color = colors[seen[node] % 6 + 1]; # Cycle through colors
    printf "%s%s%s\n", color, $0, reset;
}'

kgpwc.sh

This script enhances Kubernetes kubectl functionality by sorting and color-coding pods based on the nodes they are running on. It provides an easy-to-read visualization for Kubernetes administrators managing multiple nodes in a cluster.

Features

• Node-based Sorting: The script uses kubectl get pods -o wide and sorts the pods by the node column to group them.
• Color-coded Output: Assigns a unique color to each node, making it easier to visually differentiate between pods running on different nodes.
• Customizable: You can easily modify the script to adjust the colors or adapt it to other Kubernetes objects.

Installation

1. Download the script and save it to a directory included in your $PATH (e.g., ~/bin):

   curl -o ~/bin/kgpwc https://gist.githubusercontent.com/<your-gist-id>/raw/kgpwc.sh

2. Make the script executable:

   chmod +x ~/bin/kgpwc

3. Ensure the ~/bin directory is in your $PATH. Add this line to your ~/.zshrc or ~/.bashrc if it’s not already there:

   export PATH="$HOME/bin:$PATH"

4. Reload your shell configuration:

   source ~/.zshrc

Usage

Run the script directly in your terminal:

kgpwc

This will output a list of Kubernetes pods, sorted and grouped by node, with each node visually distinguished by a unique color.

Example Output

Troubleshooting

1. No Colors in Output:

   • Make sure your terminal supports ANSI colors. Test it by running:

     echo -e "\033[1;31mRed\033[0m Normal"

2. kubectl Issues:

   • Ensure kubectl is correctly configured to communicate with your Kubernetes cluster:

     kubectl cluster-info

3. Script Not Found:

   • Ensure the script is in a directory listed in your $PATH and is marked as executable.