Letsencrypt adding new certificate with Certboot

What is Letsencrypt !

Letsencrypt is platform that providing free ssl certificate

What is Certbot

Certbot is open source command line tool for generating ssl certificate.

Adding new certificate

 sudo certbot certonly --standalone -d example.com

for nginx

sudo certbot --nginx

for apache

sudo certbot --apache

Unless you don't use additional --certonly parameter, certbot will replace nginx and apache configuration

Renewing certiticates

Letsencrypt certificates have default 3 months expire date. we need to renew certificates periodically, otherwise website might have availability problems due to expired certificate

sudo certbot renew 

List Certificates

 sudo certbot certificates