Kubernetes Certificate Expiry Check

gistfile1.txt

#!/bin/bash
users=()
certs=()

for user in $(kubectl config view --raw --output json | jq -r '.users[] | "\(.name)"'); do
  users+=($user)
done

for cert in $(kubectl config view --raw --output json | jq -r '.users[] | "\(.user."client-certificate-data")"'); do
  certs+=($cert)
done

x=0

echo ""

while [ $x -lt ${#users[@]} ]
do
  name=${users[x]}
  date=$(echo ${certs[x]} | base64 -d | openssl x509 -text -out -  | grep "Not After" | cut -d ":" -f2-)
  echo "Certificate of $name will expire on $date"
  x+=1
done