centos7.4,apache2.4如何安装ssl证书

Question

httpd.conf中没有这两行代码

LoadModule ssl_module modules/mod_ssl.so
Include conf/extra/httpd-ssl.conf

确定已经编译和安装openssl和mod_ssl.so

也有ssl.conf
443端口开放

然后我在 /etc/httpd/conf/httpd.conf中加入这两行。结果httpd启动失败

报错信息Failed to start The Apache HTTP Server.