add-apt-repository ppa:certbot/certbot
apt install software-properties-common
apt update
apt install python-certbot-nginx
apt install python-pip
pip install certbot-dns-cloudflare

vi /root/.secrets/cloudflare.cfg
dns_cloudflare_api_key = “xxx”

certbot certonly –dns-cloudflare –dns-cloudflare-credentials /root/.secrets/cloudflare.ini -d domain.com,*.domain.com –preferred-challenges dns-01