注：和一级域名是一样的

一、申请二级域名证书：dw.liangwangzhong.com

二、配置nginx.conf的https服务

   #此处作为https静态下载使用，不启用动态配置--http://dw.liangwangzhong.com:8888
    server {
        listen       8888 ssl;
        server_name  dw.liangwangzhong.com;
        ssl_certificate               certssl/dw.liangwangzhong.com.pem;
        ssl_certificate_key           certssl/dw.liangwangzhong.com.key;
        ssl_session_timeout           5m;
        ssl_protocols                 TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers                   ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;
        ssl_prefer_server_ciphers     on;

        location / {
            root   /usr/local/nginx/download_app;
            index  index.html index.htm;
            try_files $uri $uri/ /index.php?$args;

            autoindex on;
            autoindex_exact_size on;
            autoindex_localtime on;
            sendfile           on;
            sendfile_max_chunk 1m;
            tcp_nopush on;
            tcp_nodelay       on;
            keepalive_timeout 65;

        }
        rewrite /wp-admin$ $scheme://$host$uri/ permanent;

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
              root   /usr/local/nginx/download_app;
        }

三、配置完成，生效即可