Apache版本2.4 
安装mod_ssl

yum install mod_ssl

建立文件夹，存放sslkey

mkdir /etc/httpd/ssl/

建立凭证档

openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /etc/httpd/ssl/apache.key -out /etc/httpd/ssl/apache.crt

...........................................................+++

..............+++

writing new private key to '/etc/httpd/ssl/apache.key'

-----

You are about to be asked to enter information that will be incorporated

into your certificate request.

What you are about to enter is what is called a Distinguished Name or a DN.

There are quite a few fields but you can leave some blank

For some fields there will be a default value,

If you enter '.', the field will be left blank.

-----

Country Name (2 letter code) [XX]:CHN

string is too long, it needs to be less than  2 bytes long

Country Name (2 letter code) [XX]:CN

State or Province Name (full name) []:HB

Locality Name (eg, city) [Default City]:WH

Organization Name (eg, company) [Default Company Ltd]:ZZ

Organizational Unit Name (eg, section) []:ZZ

Common Name (eg, your name or your server's hostname) []:WWW^H^[[3~^[[3~^[[3~^[[3~^[[3~^[[3~

Email Address []:webmaster@xxx.com

需要填写一些内容，我随便填的…

apache配置 
/etc/httpd/conf.d/ssl.conf 
我把这下面的内容复制到另外一个文件中配置的

<VirtualHost _default_:443>

*****

</VirtualHost>

需要修改的几项

DocumentRoot "/var/www/example.com/public_html"

ServerName www.example.com:443

SSLCertificateFile /etc/httpd/ssl/apache.crt

SSLCertificateKeyFile /etc/httpd/ssl/apache.key

重启apache

systemctl restart httpd.service

通过以上步骤就能打开网页的https链接了，但是此时的https浏览器会提示不安全的链接，那么就需要到阿里云去申请一个CA证书，目前有免费版的CA证书，下面的链接是我发在百度的申请证书的教程，大家可以参考一下

https://jingyan.baidu.com/album/4b07be3c92836148b380f318.html

上一个效果图

https变成绿色，说明证书生效！