【Apache SSL】How To Create an SSL Certificate on Apache for CentOS 7

How To Create an SSL Certificate on Apache for CentOS 7

https://www.digitalocean.com/community/tutorials/how-to-create-an-ssl-certificate-on-apache-for-centos-7

在CentOS 设置一个 SSL 加密的网页服务器

https://wiki.centos.org/zh/HowTos/Https

https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-centos-7

Crontab Generator

https://crontab-generator.org

httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

https://stackoverflow.com/questions/9541460/httpd-could-not-reliably-determine-the-servers-fully-qualified-domain-name-us

Certbot verification fails

Unable to find a virtual host listening on port 80 which is currently needed for Certbot to prove to the CA that you control your domain. Please add a virtual host for port 80.

https://www.digitalocean.com/community/questions/certbot-verification-fails