SSL Certificates using Letsencrypt

Generate certificates

  • Install letsencrypt and certbot.

sudo apt install certbot
  • Generate Certificate.

sudo certbot certonly --agree-tos --manual --preferred-challenges=dns -d * -d
  • The above command will ask for _acme-challenge, since the chosen challenge is of type DNS. Create the _acme-challenge TXT DNS record accordingly, and continue with the above prompt to certs generation.

  • The generated certs should 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 * -d
  • The above command will generate 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/ \

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