nginx 轮询机制导致分片上传文件失败 nginx dns轮询

文章目录

• 一．项目说明

• 1.1逻辑拓扑图
• 1.2项目说明

• 二．项目部署

• 1.数据库部署
• 1.1部署环境
• 1.2安装数据库
• 1.3主从复制
• 1.4Atlas负载均衡实现
• 2.apache+php部署

• 2.1安装httpd （两台机子操作相同）

• 2.2安装php
• 2.3配置apache解析php
• 2.4部署Discuz论坛
• 3 tomcat部署 （两台机子操作相同）
• 3.1 jdk环境安装
• 3.2tomcat安装
• 3.3监控应用部署
• 4.nginx部署 （两台机子操作相同）
• 4.1安装nginx
• 4.2安装monitor
• 4.3配置apache，tomcat反向代理 （两台相同）
• 5.keepalived实现两台nginx高可用
• 5.1配置四台应用服务器（操作相同）
• 5.2 keepalived 部署（主）
• 5.3 keepalived 部署（从）
• 5.4 脚本实现nginx与keepalived一起死掉

• 6.DNS轮询nginx实现负载均衡

• 6.1 dns安装
• 6.2 修改配置文件

一．项目说明

1.1逻辑拓扑图

DNS修改两台nginx都匹配一个url，实现轮询nginx达到负载均衡。
nginx 配置文件设置upstream实现负载均衡，设置location匹配实现动静分离，两台nginx使用keepalived实现高可用，并且安装monitor服务。
后端存储端做MySQL数据库，做好主从复制，并且起一台服务器做读写分离（mycat，atlas…）。
两台apache机子安装Discuz论坛服务，并且绑定后端服务器。
两台tomcat机子安装wgcloud监控服务，并且绑定后端服务器。
起一台服务器做NFS，创建四个挂在目录，挂载应用层服务。

1.2项目说明

1 192.168.9.8 DNS+nginx
2 192.168.9.9 DNS+nginx
3 192.168.9.10 apache+php
4 192.168.9.11 apache+php
5 192.168.9.12 tomcat
6 192.168.9.13 tomcat
7 192.168.9.14 mysql-master
8 192.168.9.15 mysql-slave
9 192.168.9.16 Atlas
10 192.168.9.17 NFS

二．项目部署

1.数据库部署

1.1部署环境

主MySQL 192.168.9.14 msql-m
从MySQL 192.168.9.15 mysql-s

1.2安装数据库

主从一样操作

[root@mysql-m tools]# tar xf mysql-5.7.22-linux-glibc2.12-x86_64.tar.gz  -C /usr/src/
[root@mysql-m tools]# echo $?
0
[root@mysql-m tools]# ln -s /usr/src/mysql-5.7.22-linux-glibc2.12-x86_64/ /usr/local/mysql
[root@mysql-m tools]# echo "export PATH=$PATH:/usr/local/mysql/bin/">> /etc/profile
[root@mysql-m tools]# source /etc/profile
[root@mysql-m tools]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/mysql/bin/
[root@mysql-m tools]# useradd -M -s /sbin/nologin mysql
[root@mysql-m tools]# mysqld --user=mysql --initialize --datadir=/usr/local/mysql/data

记住密码

[root@mysql-m tools]# vim /etc/my.cnf

注意server-id不能相同

[client]
port = 3306
socket = /tmp/mysql.sock
 
[mysqld]
server-id = 1
port = 3306
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
[root@mysql-m tools]# /etc/init.d/mysqld start
[root@mysql-m tools]# mysql -uroot -p"q8jM>?dkuURo"
mysql> set password=password('123123');
mysql> exit

1.3主从复制

mysql-m配置
主机添加配置文件内容

[root@mysql-m ~]# vim /etc/my.cnf
[client]
port = 3306
socket = /tmp/mysql.sock
 
[mysqld]
server-id = 1
port = 3306
log-bin=/usr/local/mysql/data/bin-log
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
[root@mysql-m ~]# /etc/init.d/mysqld restart
[root@mysql-m ~]# mysql -uroot -p123123
mysql> grant replication slave on *.* to 'repl'@'192.168.9.15' identified by '123123';
mysql> show master status\G;

mysql-s从库配置

[root@mysql-s tools]# mysql -uroot -p123123
mysql> change master to master_host='192.168.9.14',
    -> master_user='repl',
    -> master_password='123123',
    -> master_log_file='bin-log.000001',
    -> master_log_pos=154;
mysql> start slave;
mysql> show slave status\G;   没有两个yes就多刷两遍

至此主从复制完成。

1.4Atlas负载均衡实现

[root@mysql-m tools]# rpm -ivh Atlas-2.2.1.el6.x86_64.rpm

![在这里插入图片描述]()

[root@mysql-m ~]# cd /usr/local/mysql-proxy/bin/
[root@mysql-m bin]# ./encrypt 123123
++gAN07C/Q0=
此密码将在配置文件中使用

[root@mysql-m ~]# cd /usr/local/mysql-proxy/conf/
[root@mysql-m conf]# ls
test.cnf
[root@mysql-m conf]# vim test.cnf

1
[mysql-proxy]

#带#号的为非必需的配置项目

#管理接口的用户名
admin-username = user

#管理接口的密码
admin-password = pwd

#Atlas后端连接的MySQL主库的IP和端口，可设置多项，用逗号分隔
proxy-backend-addresses = 192.168.9.14:3306

#Atlas后端连接的MySQL从库的IP和端口，@后面的数字代表权重，用来作负载均衡，若省略则默认为1，可设置多项，用逗号分隔
proxy-read-only-backend-addresses = 192.168.9.15:3306

#用户名与其对应的加密过的MySQL密码，密码使用PREFIX/bin目录下的加密程序encrypt加密，下行的user1和user2为示例，将其替换为你的MySQL的用户名和加密密码！
pwds = repl:++gAN07C/Q0=

#设置Atlas的运行方式，设为true时为守护进程方式，设为false时为前台方式，一般开发调试时设为false，线上运行时设为true,true后面不能有空格。
daemon = true

#设置Atlas的运行方式，设为true时Atlas会启动两个进程，一个为monitor，一个为worker，monitor在worker意外退出后会自动将其重启，设为false时只有worker，没有monitor，一般开发调试时设为false，线上运行时设为true,true后面不能有空格。
keepalive = true

#工作线程数，对Atlas的性能有很大影响，可根据情况适当设置
event-threads = 8

#日志级别，分为message、warning、critical、error、debug五个级别
log-level = message

#日志存放的路径
log-path = /usr/local/mysql-proxy/log

#SQL日志的开关，可设置为OFF、ON、REALTIME，OFF代表不记录SQL日志，ON代表记录SQL日志，REALTIME代表记录SQL日志且实时写入磁盘，默认为OFF
sql-log = ON

#慢日志输出设置。当设置了该参数时，则日志只输出执行时间超过sql-log-slow（单位：ms)的日志记录。不设置该参数则输出全部日志。
#sql-log-slow = 10

#实例名称，用于同一台机器上多个Atlas实例间的区分
#instance = test

#Atlas监听的工作接口IP和端口
proxy-address = 0.0.0.0:1234

#Atlas监听的管理接口IP和端口
admin-address = 0.0.0.0:2345

#分表设置，此例中person为库名，mt为表名，id为分表字段，3为子表数量，可设置多项，以逗号分隔，若不分表则不需要设置该项
#tables = person.mt.id.3

#默认字符集，设置该项后客户端不再需要执行SET NAMES语句
charset = utf8

#允许连接Atlas的客户端的IP，可以是精确IP，也可以是IP段，以逗号分隔，若不设置该项则允许所有IP连接，否则只允许列表中的IP连接
#client-ips = 127.0.0.1, 192.168.1

#Atlas前面挂接的LVS的物理网卡的IP(注意不是虚IP)，若有LVS且设置了client-ips则此项必须设置，否则可以不设置
#lvs-ips = 192.168.1.1

[root@atlas bin]# cd /usr/local/mysql-proxy/
[root@atlas mysql-proxy]# ./bin/mysql-proxyd start
[root@atlas mysql-proxy]# mysql -uuser -ppwd -h 127.0.0.1 -P2345

2.apache+php部署

2.1安装httpd （两台机子操作相同）

yum install gcc gcc-c++ make pcre-devel expat-devel perl wget vim -y

[root@apache-php1 tools]# tar xf apr-1.6.5.tar.gz -C /usr/src/
[root@apache-php1 tools]# tar xf apr-util-1.6.1.tar.gz -C /usr/src/
[root@apache-php1 tools]# tar xf httpd-2.4.38.tar.gz -C /usr/src/
[root@apache-php1 tools]# cd /usr/src/
[root@apache-php1 src]# ls
[root@apache-php1 src]# mv  apr-1.6.5/   httpd-2.4.38/srclib/apr
[root@apache-php1 src]# mv  apr-util-1.6.1/   httpd-2.4.38/srclib/apr-util
[root@apache-php1 src]# cd httpd-2.4.38/
[root@apache-php1 httpd-2.4.38]# ./configure --prefix=/usr/local/httpd --enable-charset-lite --enable-rewrite --enable-cgi --enable-so && make && make install
[root@apache-php1 tools]# useradd -M -s /sbin/nologin apache
[root@apache-php1 tools]# chown -R apache.apache /usr/local/httpd/
[root@apache-php1 tools]# sed -i 's/User daemon/User apache/' /usr/local/httpd/conf/httpd.conf
[root@apache-php1 tools]# sed -i 's/Group daemon/Group apache/' /usr/local/httpd/conf/httpd.conf
修改servername
[root@apache-php1 tools]# sed -i '/#ServerName/ s/#//' /usr/local/httpd/conf/httpd.conf
增加系统命令变量路径
[root@apache-php1 tools]# echo 'PATH=$PATH:/usr/local/httpd/bin/' >> /etc/profile
[root@apache-php1 tools]# . /etc/profile
创建启动脚本并设置开机自启
[root@apache-php1 tools]# cp /usr/local/httpd/bin/apachectl /etc/init.d/httpd
[root@apache-php1 tools]# sed -i '1a# chkconfig: 35 85 15' /etc/init.d/httpd
[root@apache-php1 tools]# head -2 /etc/init.d/httpd
#!/bin/sh
# chkconfig: 35 85 15
[root@apache-php1 tools]# chkconfig --add httpd
[root@apache-php1 tools]# chmod +x /etc/rc.d/rc.local
[root@apache-php1 tools]# echo "/etc/init.d/httpd start" >> /etc/rc.d/rc.local
启动服务测试
[root@apache-php1 tools]# /etc/init.d/httpd start
[root@apache-php1 tools]# netstat -anpt | grep :80
tcp6       0      0 :::80                   :::*                    LISTEN      64521/httpd  
[root@apache-php1 tools]# curl 192.168.1.66
<html><body><h1>It works!</h1></body></html>

2.2安装php

[root@apache-php1 tools]# yum -y install libjpeg-devel libpng-devel freetype-devel libxml2-devel zlib-devel curl-devel libicu-devel openssl-devel
[root@apache-php1 tools]# tar xf php-7.3.2.tar.gz -C /usr/src/
[root@apache-php1 tools]# cd /usr/src/php-7.3.2/
[root@apache-php1 ./configure  --prefix=/usr/local/php  --with-apxs2=/usr/local/httpd/bin/apxs  --with-mysql-sock=/tmp/mysql.sock  --with-pdo-mysql  --with-mysqli  --with-zlib  --with-curl  --with-gd  --with-jpeg-dir  --with-png-dir  --with-freetype-dir  --with-openssl  --enable-mbstring  --enable-xml  --enable-session  --enable-ftp  --enable-pdo  --enable-tokenizer  --enable-intl && make && make install
创建php.ini配置文件并配置数据库接口
[root@apache-php1 php-7.3.2]# cp php.ini-development /usr/local/php/lib/php.ini
[root@apache-php1 php-7.3.2]# vim /usr/local/php/lib/php.ini
1175 mysqli.default_socket = /tmp/mysql.sock

2.3配置apache解析php

[root@apache-php1 php-7.3.2]# vim /usr/local/httpd/conf/httpd.conf
……
258 <IfModule dir_module>
259     DirectoryIndex index.html index.php
260 </IfModule>
……
395     AddType application/x-compress .Z
396     AddType application/x-gzip .gz .tgz
397     AddType application/x-httpd-php .php
398     AddType application/x-httpd-php-source .phps
……
[root@apache-php1 php-7.3.2]# httpd -t
[root@apache-php1 php-7.3.2]# /etc/init.d/httpd stop
[root@apache-php1 php-7.3.2]# /etc/init.d/httpd start

2.4部署Discuz论坛

[root@apache-php2 ~]# yum -y install unzip
[root@apache-php2 ~]#unzip Discuz_X3.3_SC_UTF8.zip
[root@apache-php2 ~]# mv upload/* /usr/local/httpd/htdocs/
[root@apache-php2 ~]#chown -R apache:apache /usr/local/httpd/htdocs
[root@apache-php1 tools]# chmod +777 /usr/local/httpd/htdocs/

登录数据库

[root@mysql-m ~]# /etc/init.d/mysqld start
[root@mysql-m ~]# mysql -uroot -p123123
mysql>  create database discuz;
mysql> grant all on *.* to 'discuzer'@'192.168.9.%' identified by '123123';

3 tomcat部署 （两台机子操作相同）

3.1 jdk环境安装

[root@tomcat1 tools]# tar xf jdk-8u60-linux-x64.tar.gz
[root@tomcat1 tools]# mv jdk1.8.0_60/ /usr/local/java8
[root@tomcat1 tools]# vim /etc/profile.d/java.sh
[root@tomcat1 tools]# source /etc/profile
[root@tomcat1 tools]# java -version

3.2tomcat安装

[root@tomcat2 tools]# tar xf  apache-tomcat-8.5.38.tar.gz
[root@tomcat2 tools]# mv apache-tomcat-8.5.38 /usr/local/tomcat
[root@tomcat2 tools]# /usr/local/tomcat/bin/startup.sh

3.3监控应用部署

https://www.wgstart.com/docs13.html //没有自行下载
解压压缩包，
登录MySQL服务器

[root@mysql-m ~]# mv wgcloud.sql /home/
[root@mysql-m ~]# mysql -uroot -p123123
mysql> use wgcloud;
mysql> set names utf8;
mysql> source /home/wgcloud.sql;   //压缩包里面有

[root@tomcat1 tools]# yum -y install unzip
[root@tomcat1 tools]# unzip wgcloud-master.zip 
[root@tomcat1 tools]# rm -rf /usr/local/tomcat/webapps/ROOT/*
[root@tomcat1 tools]# mv tools/wgcloud/* /usr/local/tomcat/webapps/ROOT/
[root@tomcat1 tools]# cd /usr/local/tomcat/webapps/ROOT
[root@tomcat1 tools]# ls
[root@tomcat1 ROOT]# cd wgcloud-server/
[root@tomcat1 wgcloud-server]# cd resources/
[root@tomcat1 resources]# vim application.yml 


[root@tomcat1 resources]# cd ..
[root@tomcat1 wgcloud-server]# cd ..
[root@tomcat1 ROOT]# cd wgcloud-agent/
[root@tomcat1 wgcloud-agent]# ls
[root@tomcat1 wgcloud-agent]# cd resources/
[root@tomcat1 resources]# ls
application.yml  logback-spring.xml
[root@tomcat1 resources]# vim application.yml 

![在这里插入图片描述]()

![在这里插入图片描述]()

![在这里插入图片描述]()

[root@tomcat1 webapps]# cd ROOT/
[root@tomcat1 ROOT]# ls
[root@tomcat1 agent]# bash start.sh 
[root@tomcat1 server]# bash start.sh

访问不了9999，就访问这个url：http://192.168.9.12:9999/wgcloud/login/toLogin

4.nginx部署 （两台机子操作相同）

4.1安装nginx

[root@nginx1~]# yum -y install pcre-devel zlib-devel openssl-devel
[root@nginx ~]# useradd -M -s /sbin/nologin nginx
[root@nginx ~]# tail -1 /etc/passwd;tail -1 /etc/group
[root@nginx ~]# cd tools/
[root@nginx tools]# tar xf nginx-1.6.0.tar.gz -C /usr/src/
[root@nginx tools]# cd /usr/src/nginx-1.6.0/
[root@nginx nginx-1.6.0]# ./configure --prefix=/usr/local/nginx  --user=nginx --group=nginx --with-file-aio  --with-http_mp4_module  --with-http_ssl_module && make && make install
[root@nginx1 ~]# ln -s /usr/local/nginx/sbin/* /usr/local/sbin/
[root@nginx1 ~]# nginx -t
[root@nginx1 ~]# ss -atp|grep nginx
[root@nginx1 ~]# curl -I http://192.168.9.8

4.2安装monitor

[root@nginx1]# yum -y install unzip
[root@nginx1]# unzip monitor-master.zip 
[root@nginx1 ~]# rm -rf /usr/local/nginx/html/*
[root@nginx1 ~]# mv tools/monitor/* /usr/local/nginx/html/

访问测试：

4.3配置apache，tomcat反向代理 （两台相同）

[root@nginx1 ]# vim /usr/local/nginx/conf/nginx.conf
user  nginx;
worker_processes  4;
error_log  logs/error.log  info;
pid        logs/nginx.pid;
events {
	use epoll;
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;

    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  logs/access.log  main;
sendfile        on;
    keepalive_timeout  65;
gzip  on;
upstream apache {
		server 192.168.9.10:80;
		server 192.168.9.11:80;
	}
	upstream tomcat {
		server 192.168.9.12:9999;
		server 192.168.9.13:9999;
	}
    server {
        listen       80;
        server_name  localhost;
        charset koi8-r;
        access_log  logs/host.access.log  main;
        location / {
            root   html;
            index  index.html index.htm;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
        location ~ \.php$ {
            proxy_pass  http://apache;
			proxy_set_header Host $host;
			proxy_set_header X-forwarded-for $proxy_add_x_forwarded_for;
			proxy_set_header X-real-ip $remote_addr;
       }

        location /data/ {
            proxy_pass  http://apache;
			proxy_set_header Host $host;
			proxy_set_header X-forwarded-for $proxy_add_x_forwarded_for;
			proxy_set_header X-real-ip $remote_addr;
       }
        location /static/ {
            proxy_pass  http://apache;
			proxy_set_header Host $host;
			proxy_set_header X-forwarded-for $proxy_add_x_forwarded_for;
			proxy_set_header X-real-ip $remote_addr;
       }
		location ~\/toLogin$ {
	        proxy_pass  http://tomcat;
			proxy_set_header Host $host;
			proxy_set_header X-forwarded-for $proxy_add_x_forwarded_for;
			proxy_set_header X-real-ip $remote_addr;
		}
		location  ~ .*\.(js|css|jpg|png)$ {
	        proxy_pass  http://tomcat;
			proxy_set_header Host $host;
			proxy_set_header X-forwarded-for $proxy_add_x_forwarded_for;
			proxy_set_header X-real-ip $remote_addr;
		}
    }
}

[root@nginx1 conf]# nginx -t
[root@nginx1 conf]# nginx -s reload

nginx上面安装的

搜索192.168.9.8/index.php 192.168.9.9/index.php

搜索 http://192.168.9.8/wgcloud/login/toLogin

5.keepalived实现两台nginx高可用

5.1配置四台应用服务器（操作相同）

[root@httpd-php1 ~]# vim /opt/lvs-dr
#!/bin/bash 
# lvs-dr 
VIP="192.168.9.66"
/sbin/ifconfig lo:vip $VIP broadcast $VIP netmask 255.255.255.255
/sbin/route add -host $VIP dev lo:vip
echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce

[root@nginx1 ~]# chmod +x /opt/lvs-dr 
[root@apache-php ~]# /opt/lvs-dr 
[root@apache-php ~]# echo "/opt/lvs-dr" >> /etc/rc.local 
[root@apache-php ~]# ip a

[root@apache-php ~]# route -n

[root@apache-php ~]# scp /opt/lvs-dr  192.168.9.11:/opt/      //12，13，14也是一样
[root@nginx2 ~]# chmod +x /opt/lvs-dr
[root@nginx2 ~]# /opt/lvs-dr
[root@nginx2 ~]# ip a
[root@nginx2 ~]# route -n
[root@nginx2 ~]# echo "/opt/lvs-dr" >> /etc/rc.local

5.2 keepalived 部署（主）

[root@nginx1 ~]# modprobe ip_vs
[root@nginx1 ~]# cat /proc/net/ip_vs
[root@nginx1 ~]# yum -y install keepalived ipvsadm
[root@nginx1 ~]# cd /etc/keepalived/
[root@nginx1 keepalived]# cp keepalived.conf{,.ori}
[root@nginx1 keepalived]# vim keepalived.conf

! Configuration File for keepalived
global_defs {
	[e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_MASTER
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.9.66
    }
}
virtual_server 192.168.9.66 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
    real_server 192.168.9.10 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
    real_server 192.168.9.11 80 {
        weight 1
        TCP_CHECK {
            onnect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
    real_server 192.168.9.12 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
    real_server 192.168.9.13 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
}

纠正上述错误
keepalived做的是两台nginx的高可用，所以只需要做互为主从，不需要做负载均衡，不需要配置虚拟真实IP。第二台nginx主机修改routerid不同就行，两个state改成和第一个相反，一从一主。优先级也改成相反的。

! Configuration File for keepalived

global_defs {
     [e-mail]
   }
   notification_email_from root@lvsdr hannibal.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_MASTER
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.9.66
    }
}
vrrp_instance VI_1 {
    state SLAVE
    interface ens33
    virtual_router_id 52
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.9.88
    }
}

[root@nginx1 keepalived]# systemctl start keepalived
[root@nginx1 keepalived]# ipvsadm -ln

[root@nginx1 keepalived]# ip a

5.3 keepalived 部署（从）

[root@nginx2 ~]# yum -y install ipvsadm keepalived
[root@nginx2 ~]# cp /etc/keepalived/keepalived.conf{,.ori}
[root@nginx2	~]#	scp	192.168.9.8:/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf
[root@nginx2 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
	[e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_SLAVE
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
vrrp_instance VI_1 {
    state SLAVE
    interface ens33
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.9.66
    }
}
virtual_server 192.168.9.66 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
    real_server 192.168.9.8 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
    real_server 192.168.9.9 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
    real_server 192.168.9.12 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
    real_server 192.168.9.13 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
			connect_port 80
        }
    }
}

[root@nginx2 ~]# systemctl start keepalived
[root@nginx2 ~]# ip a

5.4 脚本实现nginx与keepalived一起死掉

注意，nginx宕机后keepalived不会自动结束进程，高可用是无效的，所以编辑脚本设置nginx宕机后keepaloved也杀掉进程。脚本内容如下：

#!/bin/bash
while :;do
	pidof nginx &> /dev/null
	if [ $? -ne 0 ];then
		/usr/local/nginx/sbin/nginx &> /dev/null
		pidof nginx $> /dev/null
		if [ $? -ne 0 ];then
			/usr/bin/systemctl stop keepalived
		else
			pidof keepalived &> /dev/null
			if [ $? -ne 0 ];then
				/usr/bin/systemctl start keepalived
			fi
		else
			pidof keepalived &> /dev/null
			if [ $? -ne 0 ];then
				/usr/bin/systemctl start keepalived
			fi
		fi
	fi
	sleep 3
done

6.DNS轮询nginx实现负载均衡

6.1 dns安装

[root@nginx1 ~]# yum  -y install bind bind-utils bind-chroot bind-libs
[root@nginx1 named]# rpm -qa | grep bind

6.2 修改配置文件

DNS服务器首选DNS选择自己IP地址

vim /etc/resolves

[root@ng1 ~]# vim /etc/named.conf 

[root@dns ~]# named-checkconf /etc/named.conf
[root@ng1 ~]# cd /var/named
[root@ng1 named]# cp -p named.empty yun220.com.zone
[root@ng1 named]# vim yun220.com.zone

[root@dns named]# named-checkzone yun220.com yun220.com.zone