[root@centos7 vhost]# vim /usr/local/nginx/conf/vhost/load.conf

upstream www.tt.com
#自定义域名
{
#  ip_ash;
  #保证同一个用户始终保持在同一台机器上,即当域名指向多个IP时，保证每个用户始终解析到同一IP
  server 192.168.3.74:80;
  server 192.168.3.83:80;
  #指定web服务器的IP
}
server
{
  listen 80;
  server_name www.tt.com;
  location /
  {
    proxy_pass   http://tt.com;
    proxy_set_header Host  $host;
    proxy_set_header X-Real-IP   $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  }
}

[root@centos7 nginx-1.12.1]# cd /data/package/nginx-1.12.1

[root@centos7 nginx-1.12.1]# ./configure --prefix=/usr/local/nginx --with-http_ssl_module 

make

make install

[root@centos7 vhost]# cd /usr/local/nginx/conf/

[root@centos7 conf]# openssl genrsa -des3 -out tmp.key 2048

[root@centos7 conf]# openssl rsa -in tmp.key -out testssl.key 
Enter pass phrase for tmp.key: 输入第2步的密码

[root@centos7 conf]# rm -f tmp.key

[root@centos7 conf]# openssl req -new -key testssl.key -out testssl.csr

Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:GD
Locality Name (eg, city) [Default City]:GZ
Organization Name (eg, company) [Default Company Ltd]:FC
Organizational Unit Name (eg, section) []:FC
Common Name (eg, your name or your server's hostname) []:testssl
Email Address []:admin@admin.com

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:123456
An optional company name []:123456

[root@centos7 conf]# ls testssl.*
testssl.csr testssl.key

[root@centos7 conf]# openssl x509 -req -days 365 -in testssl.csr -signkey testssl.key -out testssl.crt
Signature ok
subject=/C=CN/ST=GD/L=GZ/O=FC/OU=FC/CN=testssl/emailAddress=admin@admin.com
Getting Private key
You have new mail in /var/spool/mail/root
[root@centos7 conf]# ls testssl.*
testssl.crt testssl.csr testssl.key

[root@centos7 vhost]# vi ssl.conf 
server
{
  listen 443;
  server_name testssl.com;
  index index.html index.php;
  root /data/wwwroot/ssl.com;
  ssl on;
  #开启ssl
  ssl_certificate testssl.crt;
  #配置公钥
  ssl_certificate_key testssl.key;
  #配置私钥
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
  #配置协议
}

[root@centos7 vhost]# /etc/init.d/nginx restart

[root@centos7 vhost]# netstat -nutlp| grep 443
tcp    0   0 0.0.0.0:443       0.0.0.0:*        LISTEN   7703/nginx: master