Nginx+Keepalive实现高可用+负载均衡并配置多web站点（两台服务器）

主机A：192.168.0.10

主机B：192.168.0.20

VIP：   192.168.0.30

域名A：a.com域名B：b.com

1、两台服务器安装nginx（此处省略很多字）；

2、修改两台服务器的nginx配置nginx.conf（nginx.conf的配置可以直接同步）

在http{}里面增加这一段

upstream a.com {
              server 192.168.0.10:81;
              server 192.168.0.20:81;
#             ip_hash;  ###如果用到session则需要开启ip_hash
        }
server {
        listen       80;
        server_name  a.com;
        location / {
          proxy_pass         http://a.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;
       }
}  
upstream b.com {
              server 192.168.0.10:82;
              server 192.168.0.20:82;       
#             ip_hash;  ###如果用到session则需要开启ip_hash
        }
server {
        listen       80;
        server_name  b.com;
        location / {
          proxy_pass         http://b.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;
       }
       }
                              
server {
        listen 81;
        server_name localhost;
        index index.html index.htm index.php;
        root /tmp/a;
        client_max_body_size 1024m;
       }
server {
        listen 82;
        server_name localhost;
        index index.html index.htm index.php;
        root /tmp/b;
        client_max_body_size 1024m;
       }

1、安装keepalive（A、B两台操作一样）

可以直接到http://www.keepalived.org/download.html下载最新稳定版

wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz

tar -xf keepalived-1.2.7.tar.gz

cd keepalived-1.2.7

./configure && make && make install

mkdir /etc/keepalived

vim /etc/keepalived/keepalived.conf

global_defs {
   notification_email {
    [email protected] 
        }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state MASTER  #从设置为BACKUP
    interface eth0  #网卡名
    virtual_router_id 51
    mcast_src_ip 192.168.0.10 #本机IP
    priority 100  #从机小于主机
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.0.30/16
    }
}

/etc/init.d/nginx start

/etc/init.d/keepalived start