Nginx+Keepalived 负载均衡环境:

两台负载均衡服务器

nginx proxy     10.0.0.5           (keepalived +nginxproxy1)

nginx proxy     10.0.0.6           (keepalived +nginxproxy2)

两台后端RS服务器

RS1             10.0.0.3            nginx

RS2             10.0.0.4            nginx



下面nginx和keepalived都要在两台负载均衡服务器中安装

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1、安装nginx 


#1.安装nginx依赖库

yum install openssl openssl-devel -y

yum install pcre-devel -y


#2.创建nginx用户:

useradd -s /sbin/nologin nginx

tail -1 /etc/passwd

#3 安装nginx

mkdir -p /home/lvnian/tools

cd /home/lvnian/tools

wget http://nginx.org/download/nginx-1.6.2.tar.gz

tar zxf nginx-1.6.2.tar.gz 

cd nginx-1.6.2

./configure \

--user=nginx \

--group=nginx \

--prefix=/application/nginx-1.6.2 \

--with-http_stub_status_module \

--with-http_ssl_module \

--with-http_realip_module

make && make install

#4.制作软连接:

ln -s /application/nginx-1.6.2  /application/nginx

ll /application

#5 启动nginx

#/application/nginx/sbin/nginx -t  

/application/nginx/sbin/nginx #(不用接参数,就是启动nginx)


######安装完成nginx

netstat -lnt |grep 80

ps -ef |grep nginx |grep -v grep

lsof -i :80

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2、安装keepalived


1.做相关内核软连接

安装keepalived之前要先做软连接

ls /usr/src/kernels/`uname -r` -ld

ln -s /usr/src/kernels/`uname -r` /usr/src/linux

ls /usr/src/ -l


2.下载并安装keepalived软件

[ ! -d /home/lvnian/tools ] && mkdir /home/lvnian/tools -p

cd /home/lvnian/tools 

wget http://www.keepalived.org/software/keepalived-1.2.10.tar.gz

tar xf keepalived-1.2.10.tar.gz 

cd keepalived-1.2.10

./configure 

make && make install


3.配置启动规范

/bin/cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/

/bin/cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived 

/bin/cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

/bin/cp /usr/local/sbin/keepalived /usr/sbin/

/etc/init.d/keepalived start

ps -ef |grep keepalived

安装完成keepalived服务


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3、配置Keepalived 服务

MASTER:

[root@KEEP1 keepalived]# cat keepalived.conf

! Configuration File for keepalived


global_defs {

   notification_email {

   759685538@qq.com

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS_1

}


vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 55

    priority 150

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        10.0.0.100/24

    }

}

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BACKUP:

[root@KEEP2 keepalived]# cat keepalived.conf

! Configuration File for keepalived


global_defs {

   notification_email {

   759685538@qq.com

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS_2

}


vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 55

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        10.0.0.100/24

    }

}

[root@KEEP2 keepalived]# 

配置成功Keepalived的标准是VIP可以随服务器是否正常进行漂移。这里用是否启动keepalived服务进行VIP漂移

正常情况下:

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停止KEEP1

[root@KEEP1 ~]# /etc/init.d/keepalived stop 

Stopping keepalived:                                       [  OK  ]

[root@KEEP1 ~]# 

wKioL1YcovrSjcdcAADO6GOHsQg587.jpg

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4、配置nginx负载均衡功能


下面配置文件在两个负载均衡服务器上面配置相同


[root@KEEP1 conf]# cat nginx.conf

worker_processes  1;

events {

    worker_connections  1024;

}

http {

    include       mime.types;

    default_type  application/octet-stream;

    sendfile        on;

    keepalive_timeout  65;

         upstream web_real_server{

               #  ip_hash;       #用ip哈希算法保持会话

                 server 10.0.0.3:80 max_fails=3 fail_timeout=20s;

                 server 10.0.0.4:80 max_fails=3 fail_timeout=20s;

            }

        server {

                listen 80;

                server_name www.lvnian.com;

                location / {

                index index.php index.htm index.html;

                proxy_redirect off;

                proxy_set_header Host $host;

                proxy_set_header X-Real-IP $remote_addr;

                proxy_next_upstream http_500 http_502 http_503 error timeout invalid_header;

                proxy_set_header X-Forwarded-For $remote_addr;

                proxy_pass http://web_real_server;

             }

      }

}

[root@KEEP1 conf]# 

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proxy_pass http://web_real_server;

用于指定反向代理的服务器池

proxy_set_header Host $host;

当后端web服务器上也配置有多个虚拟主机时,需要用改Header来区分反向代理那个主机名

proxy_set_header X-Forwarded-For $remote_addr;

如果后端Web服务器上的程序需要获取用户IP,从该Header头中获取  

proxy_next_upstream http_500 http_502 http_503 error timeout invalid_header;

这个参数是用来定义故障转移策略的,当后端服务器节点返回500/502/503和执行超时等错误时,自动将请求转到upstream负载均衡中的另外一台服务器,实现故障转移

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2、配置调试用的nginx web服务器或者Apache(RS节点)操作((RS)nginx的安装和上面的nginx安装一样)

RS1                10.0.0.3                nginx

RS210.0.0.4nginx

RS就把web服务配置成功即可

[root@RS1 ~]# curl 10.0.0.3

10.0.0.3

[root@RS1 ~]#

[root@RS2 ~]# curl 10.0.0.4

10.0.0.4

[root@RS2 ~]#  

在实际的工作场景中。RS1和RS2提供的web服务应该是一样,在这里设置成不一样,主要是为了区分客户端访问的时候,是不同的服务器在提供服务。

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测试的客户端配置hosts文件  

echo "10.0.0.100 www.lvnian.com">>/etc/hosts



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上面的测试说明这个实验已经实现了负载均衡的功能了


部署完成

你还可以把其中一台RS服务挂起;或者把其中一台Nginx负载均衡服务器断开;设置可以把一台nginx负载均衡服务器断开以及一台RS同时断开;服务都可以已经对外正常提供,这就是Keepalived+Nginx的高可用性。在这就不一一做实验了。