certificates.sh

# Launch a network utility container in Kubernetes
kubectl run netutils --image=jonlabelle/network-tools -i -t --rm --command -- bash

# Delete the pod later
kubectl delete pod netutils

# Check a certificate with OpenSSL:
openssl s_client -showcerts -connect host.domain.com:1433

# For SQL Server sometimes you need to use nmap instead
nmap -v -Pn --script=ssl-cert -p 1433 host.domain.com