SSL / Let's Encrypt#
Obtain SSL certificate#
certbot --nginx -d domain.com
Obtain SSL for multiple domains#
certbot --nginx -d domain.com -d www.domain.com
Renew certificate#
certbot renew
Test certificate renewal#
certbot renew --dry-run
Check certificate status#
certbot certificates
Revoke certificate#
certbot revoke --cert-path /etc/letsencrypt/live/domain.com/cert.pem
Check DNS resolution#
dig +short domain.com A
Check DNS with nslookup#
nslookup domain.com
Ping domain#
ping -c 2 domain.com