Generate SSL Certificates using Letsencrypt

This document guides you to generate and renew SSL certificates using letsencrypt.

Procedure

The steps to generate SSL certificates are given below.

• Install letsencrypt and certbot.

sudo apt install certbot

• Generate Certificate.

sudo certbot certonly --agree-tos --manual --preferred-challenges=dns -d *.openg2p.sandbox.net -d openg2p.sandbox.net

• Since the preferred challenge is DNS type, the above command asks for _acme-challenge. Create the _acme-challenge TXT DNS record accordingly, and continue with the above prompt to generate certs.

• The generated certs must be present in /etc/letsencrypt directory.

Renew certificates

• Run the same generate certs command to renew certs.

sudo certbot certonly --agree-tos --manual --preferred-challenges=dns -d *.openg2p.sandbox.net -d openg2p.sandbox.net

• The above command generates a new pair of certificates. The DNS challenge needs to be performed again, as prompted.

• Run the following to upload new certs back to Kubernetes Cluster. Adjust the certs path in the below command.

kubectl delete secret tls-openg2p-ingress -n istio-system
kubectl create secret tls tls-openg2p-ingress -n istio-system \
  --cert=/etc/letsencrypt/live/openg2p.sandbox.net-renewed/fullchain.pem \
  --key=/etc/letsencrypt/live/openg2p.sandbox.net-renewed/privkey.pem