Forcefully delete a Kubernetes namespace

force-delete-namespace.sh

#!/bin/sh
# Forcefully delete a Kubernetes namespace.

if [[ $# -eq 0 ]]; then
    echo $'[ERROR] No namespace specified, please specify one \n\n Usage: ./force-delete-namespace.sh [namespace]'
    exit 0
fi

# get namespace JSON
kubectl get ns $1 -o json >tmp_$1.json

# remove 'kubernetes' from spec.finalizers
sed -i 's/"kubernetes"//g' tmp_$1.json

# inject new spec
kubectl replace --raw "/api/v1/namespaces/$1/finalize" -f ./tmp_$1.json

# remove temporary JSON file
rm tmp_$1.json