下文给大家带来负载均衡Nginx配置流程及步骤介绍，希望能够给大家在实际运用中带来一定的帮助，负载均衡涉及的东西比较多，理论也不多，网上有很多书籍，今天我们就用创新互联在行业内累计的经验来做一个解答。

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192.168.1.150  VOIP   虚拟IP
192.168.1.151  CNSHANK01  负载均衡1
192.168.1.152  CNSHANK02  负载均衡2
系统：Centos7.4

一、nginx配置（两台nginx配置一模一样，主页设置不同）：

1. 安装：
   yum  -y  install  nginx
2. 配置：
   vim /etc/nginx/nginx.conf
   user nginx;
   worker_processes auto;
   error_log /var/log/nginx/error.log;
   pid /run/nginx.pid;
   include /usr/share/nginx/modules/*.conf;
   events {
   worker_connections 12800;
   use epoll;
   }
   http {

include mime.types;
default_type  application/octet-stream;
limit_conn_zone $binary_remote_addr zone=addr:10m; #防IP***

log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log  /var/log/nginx/access.log  main;
sendfile       on;
tcp_nopush      on;
tcp_nodelay     on;
keepalive_timeout  65;
types_hash_max_size 2048;
include /etc/nginx/mime.types; #协助部分浏览器（如firefox）识别网页文件的类型
default_type     application/octet-stream;
include /etc/nginx/conf.d/*.conf;

client_body_buffer_size 1k;  #指定客户端请求主体缓冲区大小
client_header_buffer_size 1k;  #指定来自客户端请求头的headerbuffer大小
large_client_header_buffers 2 1k; #客户端请求中较大的消息头指定的缓存大数量和大小
server_tokens off;  #禁止在错误页面上显示nginx版本号
client_body_timeout 20;  #设置客户端请求主体读取超时时间
client_header_timeout 20; #设置客户端请求头读取超时时间
gzip  on;

upstream dynamic {  #负载云服务器名dynamic
ip hash;   #采用ip_hash方式
server 192.168.1.154:80;  
server 192.168.1.155:80;
}
server {
listen    80 default_server;
listen    [::]:80 default_server;
server_name  blog.dollarphp.com;
root     /usr/share/nginx/html;
include /etc/nginx/default.d/*.conf;
location / {
proxy_pass http://dynamic;  #负载均衡 代理
limit_conn addr 100;  #指定每个ip最多只允许建立100个连接
limit_rate 500k;     #每个ip大带宽是500k
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504 http_404;

   index index.html index.htm;
   autoindex on;
   autoindex_localtime on;
}
location ~* ^.+.(js|css|htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma)$ {
   root html;
}
location ~* ^.+.(?![js|css|htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma])$ {
   proxy_set_header Host $host;
   proxy_set_header X-Real-IP $remote_addr;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
}
error_page 404 /404.html;
   location = /40x.html {
}
error_page 500 502 503 504 /50x.html;
   location = /50x.html {
}

}
}

1. 设置配置主页测试文件
   cd /usr/share/nginx/html
   cp ./index.html ./index.html.bak
   echo “CNSHANK01-192.168.1.151”>./index.html #在主机192.1681.151上
   echo “CNSHANK02-192.168.1.152”>./index.html #在主机192.1681.152上

2. 启动
   systemctl  start  nginx
   systemctl  enable  nginx

二、keepalived配置：
I、主服务器配置（192.168.1.151）：

1. 安装：
   yum  -y  install  keepalived

2. 配置：
   vim /etc/keepalived/keepalived.conf
   ! Configuration File for keepalived
   global_defs {
   }
   vrrp_script chk_nginx {
   script "/etc/keepalived/check.sh"
   interval 1
   weight -15
   }
   vrrp_instance VI_1 {  #  实例，一个vip一个实例
   state MASTER   #标识为主服务
   interface ens33
   virtual_router_id 51  #与从机保持一致即可
   priority 100 #权重 ，高于从机
   advert_int 1
   authentication {   # 认证授权，设置验证信息，两个节点必须一致
   auth_type PASS
   auth_pass 123456
   }
   virtual_ipaddress {  #虚拟ip地址
   192.168.1.150
   }
   track_script { #nginx监控服务
   chk_nginx
   }
   notify_master "/etc/keepalived/notify.sh master"
   notify_backup "/etc/keepalived/notify.sh backup"
   notify_fault "/etc/keepalived/notify.sh fault"
   }

3. 添加服务检查脚本（check.sh）：
   vim /etc/keepalived/check.sh
   #!/bin/bash
   if [ "pgrep  nginx  |  wc  -l" == "0" ] ; then
   exit 1
   else
   exit 0
   fi

4. 通知脚本（notify.sh）：
   vim /etc/keepalived/notify.sh
   #!/bin/bash
   if [ "$1" == "master" ] ; then
   echo "date '+%F %T'：切换到主机模式" >> /var/log/keepalived/keepalived.log
   elif [ "$1" == "backup" ] ; then
   /usr/bin/systemctl start nginx
   echo "date '+%F %T'：切换到备机模式" >> /var/log/keepalived/keepalived.log
   else
   /usr/bin/systemctl start nginx
   echo "date '+%F %T'：宕机" >> /var/log/keepalived/keepalived.log
   fi

5. 给脚本添加可执行权限：
   chmod  +x  /etc/keepalived/check.sh
   chmod  +x  /etc/keepalived/notify.sh

6. 创建日志目录：
   mkdir  /var/log/keepalived

7. 启动：
   systemctl  start  keepalived

II、备服务器配置（192.168.1.152）：

1. 安装：
   yum  -y  install  keepalived

2. 配置：
   vim /etc/keepalived/keepalived.conf
   ! Configuration File for keepalived
   global_defs {
   }
   vrrp_script chk_nginx {
   script "/etc/keepalived/check.sh"
   interval 1
   weight -15
   }
   vrrp_instance VI_1 {
   state BACKUP   #BACKUP模式
   interface ens33
   virtual_router_id 51   #与主机一致
   priority 99 #比主机小
   advert_int 1
   authentication {   #与主机一致
   auth_type PASS
   auth_pass 123456
   }
   virtual_ipaddress {
   192.168.1.150
   }
   track_script {
   chk_nginx
   }
   notify_master "/etc/keepalived/notify.sh master"
   notify_backup "/etc/keepalived/notify.sh backup"
   notify_fault "/etc/keepalived/notify.sh fault"
   }

3. 添加服务检查脚本（check.sh）：
   vim /etc/keepalived/check.sh
   #!/bin/bash
   if [ "pgrep  nginx  |  wc  -l" == "0" ] ; then
   exit 1
   else
   exit 0
   fi
4. 通知脚本（notify.sh）：
   vim /etc/keepalived/notify.sh
   #!/bin/bash
   if [ "$1" == "master" ] ; then
   echo "date '+%F %T'：切换到主机模式" >> /var/log/keepalived/keepalived.log
   elif [ "$1" == "backup" ] ; then
   /usr/bin/systemctl start nginx
   echo "date '+%F %T'：切换到备机模式" >> /var/log/keepalived/keepalived.log
   else
   /usr/bin/systemctl start nginx
   echo "date '+%F %T'：宕机" >> /var/log/keepalived/keepalived.log
   fi
5. 给脚本添加可执行权限：
   chmod  +x  /etc/keepalived/check.sh
   chmod  +x  /etc/keepalived/notify.sh
6. 创建日志目录：
   mkdir  /var/log/keepalived
7. 启动：
   systemctl  start  keepalived
   三、测试：
   I、正常状态下
   

II、停止主服务器：192.168.1.151后测试

1. 停止从服务器nginx服务，结果可以看到访问虚拟IP时候会从主服务器切到从服务器
   systemctl  stop  nginx
   
   
   
2. 查看日志：
   tail  /var/log/keepalived/keepalived.log
   主从机日志都显示切到备机模式
   
   

用域名测试
修改本地hosts文件C:\Windows\System32\drivers\etc\hosts文件加入
192.168.1.150 www.bbs.com

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文章名称：负载均衡Nginx配置流程及步骤介绍-创新互联
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