Nginx负载均衡/SSL配置的实现

什么是负载均衡？

当一个域名指向多台web服务器时，添加一台nginx负载均衡服务器，通过nginx负载均衡即可将来自于客户端的请求均衡的发送给每台web服务器，避免单台服务器负载过高而其余服务器较为空闲的不均衡情况出现

配置nginx负载均衡：

在nginx机器上新建配置文件：

[root@centos02 ~]# vi /etc/nginx/conf.d/test.conf

添加如下内容：

upstream test {  ip_hash;   server 192.168.0.10:80 weight=100;   server 192.168.0.20:80 weight=50; } server {  listen 80;  server_name www.test.com;  location /  {   proxy_pass http://test;   proxy_set_header Host $host;   proxy_set_header X-Real-IP $remote_addr;   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  } }

验证nginx配置并重载：

[root@centos02 ~]# nginx -tnginx: the configuration file /etc/nginx/nginx.conf syntax is oknginx: configuration file /etc/nginx/nginx.conf test is successful[root@centos02 ~]# nginx -s reload

接下来修改客户端hosts文件将测试的域名www.test.com指向到测试的nginx负载均衡机器的IP即可访问www.test.com网站。

负载均衡配置示例补充

1.根据请求的文件配置：

upstream aa {       server 192.168.0.10;    server 192.168.0.20;   }upstream bb {     server 192.168.0.100;    server 192.168.0.101; } server {  listen  80;  server_name www.test.com;  location ~ aa.php  {   proxy_pass http://aa/;   proxy_set_header Host $host;   proxy_set_header X-Real-IP  $remote_addr;   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  }  location ~ bb.php  {    proxy_pass http://bb/;    proxy_set_header Host $host;    proxy_set_header X-Real-IP  $remote_addr;    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  }  location /  {    proxy_pass http://bb/;    proxy_set_header Host $host;    proxy_set_header X-Real-IP  $remote_addr;    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  }}

请求aa.php的，会到aa组，请求bb.php的会到bb组，其他请求全部到bb组，必须要有location / {} ，否则不能正确匹配url

2.根据请求的目录配置：

upstream aa {       server 192.168.0.10;    server 192.168.0.20;   }upstream bb {     server 192.168.0.100;    server 192.168.0.101; } server {  listen  80;  server_name www.test.com;  location /dir1/  {   proxy_pass http://aa/dir1/;   proxy_set_header Host $host;   proxy_set_header X-Real-IP  $remote_addr;   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  }  location /dir2/  {    proxy_pass http://bb/dir2/;    proxy_set_header Host $host;    proxy_set_header X-Real-IP  $remote_addr;    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  }  location /  {    proxy_pass http://bb/;    proxy_set_header Host $host;    proxy_set_header X-Real-IP  $remote_addr;    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  }}