certbot

The Let’s Encrypt Agent for automatically obtaining and renewing TLS certificates. Successor to letsencrypt. More information: https://certbot.eff.org/docs/using.html.

• Obtain a new certificate via webroot authorization, but do not install it automatically:

sudo certbot certonly --webroot --webroot-path path/to/webroot --domain subdomain.example.com

• Obtain a new certificate via nginx authorization, installing the new certificate automatically:

sudo certbot --nginx --domain subdomain.example.com

• Obtain a new certificate via apache authorization, installing the new certificate automatically:

sudo certbot --apache --domain subdomain.example.com

• Renew all Let’s Encrypt certificates that expire in 30 days or less (don’t forget to restart any servers that use them afterwards):

sudo certbot renew

• Simulate the obtaining of a new certificate, but don’t actually save any new certificates to disk:

sudo certbot --webroot --webroot-path path/to/webroot --domain subdomain.example.com --dry-run

• Obtain an untrusted test certificate instead:

sudo certbot --webroot --webroot-path path/to/webroot --domain subdomain.example.com --test-cert