Find PDBs guarding single pods

kubectl-badpdb

#!/bin/sh
set -e

if ! type jq 2>/dev/null 1>/dev/null; then
    echo "jq command is required, please install it" >&2
    exit 1
fi

kubectl get pdb -A -o json | \
    jq -r '.items[] | {name: .metadata.name, namespace: .metadata.namespace, selector: ((.spec.selector.matchLabels // {} | to_entries | .[] |= "\(.key)=\(.value)") + (.spec.selector.matchExpressions // [] | .[] |= .key + " " + (.operator | ascii_downcase) + " (" + (.values[] | @json) + ")")) | join(",")  }' -c | \
    while read -r pdb; do
        export pdb
        name="$(printenv pdb | jq '.name')"
        namespace="$(printenv pdb | jq '.namespace')"
        selector="$(printenv pdb | jq '.selector')"
        if [ "$(kubectl -n "$namespace" get pod -l "$selector" -o go-template='{{ len .items }}' 2>/dev/null)" -eq 1 ]; then
            echo "Found bad PDB in namespace $namespace by the name $name"
        fi
    done