bash script to estimate cost percent of my kubernetes namespaces.

k8s_mem_percent.sh

#!/bin/bash

if [ $# -eq 0 ]; then
    echo "Usage: $0 <namespace1> <namespace2> ..."
    echo "Example: $0 fred jane"
    exit 1
fi

#for ns in $@; do
#    # Get memory limits for all pods in the namespace
#    memory_limits=$(kubectl get pods -n $ns -o jsonpath='{range .items[*]}{range .spec.containers[*]}{.resources.limits.memory}{"\n"}{end}{end}')
#    
#    # Sum up the memory limits
#    sum_bytes=0
#    for limit in $memory_limits; do
#        bytes=$(to_bytes $limit)
#        sum_bytes=$((sum_bytes + bytes))
#    done
#    
#    # Add to total memory
#    total_memory=$((total_memory + sum_bytes))
#    
#    # Print the result for this namespace
#    printf "%-30s %d\n" "$ns:" "$sum_bytes"
#done

get_namespace_memory() {
    kubectl get pods -n "$1" -o jsonpath='{range .items[*]}{range .spec.containers[*]}{.resources.limits.memory}{"\n"}{end}{end}' | awk '{ sum += $1 } END { print sum }'
}


total_memory=$(kubectl get pods --all-namespaces -o jsonpath='{range .items[*]}{range .spec.containers[*]}{.resources.limits.memory}{"\n"}{end}{end}' | awk '{ sum += $1 } END { print sum }')

specified_memory=0
for namespace in "$@"; do
    ns_memory=$(get_namespace_memory "$namespace")
    specified_memory=$((specified_memory + ns_memory))
done

# Not used, yolo stackexchange.
to_bytes() {
    local value=$1
    case ${value: -2} in
        Ki) echo $((${value%Ki} * 1024)) ;;
        Mi) echo $((${value%Mi} * 1024 * 1024)) ;;
        Gi) echo $((${value%Gi} * 1024 * 1024 * 1024)) ;;
        *)  echo $value ;;
    esac
}

# Convert to bytes
#total_bytes=$(to_bytes $total_memory)
#specified_bytes=$(to_bytes $specified_memory)

# Calculate percentage
percentage=$(awk "BEGIN {printf \"%.2f\", ($specified_memory / $total_memory) * 100}")

echo "Percentage of cluster memory allocated to pods in specified namespaces: $percentage%"
echo "Specified namespaces: $@"