Usage Docs

install on Debian 12 with nginx

Link

sudo apt update
sudo apt upgrade

sudo apt install certbot python3-certbot-nginx

expand domans of a certificate

Add new domains to an existing certificate

method1

Docs

# shrink extra domains
certbot certonly --cert-name example.com -d example.com

# expand domains
certbot certonly --cert-name example.com -d example.org,www.example.org

method2

Docs

Consider using --cert-name instead of --expand, as it gives more control over which certificate is modified and it lets you remove domains as well as adding them.

certbot --expand -d existing.com,example.com,newdomain.com

# or
certbot --expand -d existing.com -d example.com -d newdomain.com

install multi-domain certifiacete

certbot certonly -d example.com -d www.example.com