lvs+keepalived+gninx高性能负载均衡

1.下载keepalived
wget http://www.keepalived.org/software/keepalived-1.2.18.tar.gz
2.解压安装：
tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
3.下载插件openssl
yum install -y openssl openssl-devel（需要安装一个软件包）
4.开始编译keepalived
cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
5.make一下
make && make install


报错: eepalived执行./configure --prefix=/usr/local/keepalived时报错：configure: error: Popt libraries is required
出现此错误的原因：
未安装popt的开发包
解决方法：
yum install popt-devel
安装好popt的开发包。重新./configure 即可。


keepalived安装成Linux系统服务

将keepalived安装成Linux系统服务，因为没有使用keepalived的默认安装路径（默认路径：/usr/local）,安装完成之后，需要做一些修改工作：
首先创建文件夹，将keepalived配置文件进行复制：
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
然后复制keepalived脚本文件：
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/sbin/keepalived /usr/sbin/
ln -s /usr/local/keepalived/sbin/keepalived/sbin/
可以设置开机启动：chkconfig keepalived on，到此我们安装完毕!
keepalived 常用命令
service keepalived start
service keepalived stop

启动报错Starting keepalived (via systemctl):  Job for keepalived.service failed. See 'systemctl status keepalived.service' and 'journalctl -xn' for details.  
解决办法
[root@edu-proxy-01 sbin]# cd /usr/sbin/  
[root@edu-proxy-01 sbin]# rm -f keepalived   
[root@edu-proxy-01 sbin]# cp /usr/local/keepalived/sbin/keepalived  /usr/sbin/  

! Configuration File for keepalived

# 心跳检测的脚本，去执行这个sh 文件
vrrp_script chk_nginx {
    script "/etc/keepalived/nginx_check.sh"
    interval 20
    weight -20
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 121
    mcast_src_ip 192.168.178.115
    priority 100
    nopreempt
    advert_int 1
    
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    
    # 心跳检测的脚本
    track_script {
        chk_nginx
    }
    
    virtual_ipaddress {
        192.168.178.116
    }
  

}

#!/bin/bash
if [ `ps -C nginx --no-header | wc -l` -eq 0 ]; then /usr/local/nginx/sbin/nginx; sleep 5; if [ `ps -C nginx --no-header | wc -l` -eq 0 ]; then systemctl stop keepalived; fi; fi

! Configuration File for keepalived

vrrp_script chk_nginx {
    script "/etc/keepalived/nginx_check.sh"
    interval 2 #检测时间间隔
    weight -20 #如果条件成立的话，则权重 -20
}

vrrp_instance VI_2 {
    state BACKUP #来决定主从
    interface ens33 # 绑定虚拟 IP 的网络接口，根据自己的机器填写
    virtual_router_id 121 # 虚拟路由的 ID 号， 两个节点设置必须一样
    mcast_src_ip 192.168.178.110 #填写本机ip
    priority 100 # 节点优先级,主要比从节点优先级高
    nopreempt # 优先级高的设置 nopreempt 解决异常恢复后再次抢占的问题
    advert_int 1 # 组播信息发送间隔，两个节点设置必须一样，默认 1s
    track_script {
        chk_nginx
    }
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    virtual_ipaddress {
        192.168.178.116 # 虚拟ip,也就是解决写死程序的ip怎么能切换的ip,也可扩展，用途广泛。可配置多个。
    }
}

#!/bin/bash
if [ `ps -C nginx --no-header | wc -l` -eq 0 ]; then /usr/local/nginx/sbin/nginx; sleep 5; if [ `ps -C nginx --no-header | wc -l` -eq 0 ]; then systemctl stop keepalived; fi; fi

    upstream aiyuesheng {
      server 192.168.178.1:8080;
      server 192.168.178.1:8081;
     }
    
    server {
        listen       80;
        server_name  localhost;
        location / {
            proxy_pass   http://aiyuesheng;
            index  index.html index.htm;
        }
         ###nginx与上游服务器(真实访问的服务器)超时时间 后端服务器连接的超时时间_发起握手等候响应超时时间
          proxy_connect_timeout 1s;
         ###nginx发送给上游服务器(真实访问的服务器)超时时间
         proxy_send_timeout 1s;
          ### nginx接受上游服务器(真实访问的服务器)超时时间
         proxy_read_timeout 1s;

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }


    }

    upstream aiyuesheng {
      server 192.168.178.1:8082;
      server 192.168.178.1:8083;
     }
    
    server {
        listen       80;
        server_name  localhost;
        location / {
            proxy_pass   http://aiyuesheng;
            index  index.html index.htm;
        }
         ###nginx与上游服务器(真实访问的服务器)超时时间 后端服务器连接的超时时间_发起握手等候响应超时时间
          proxy_connect_timeout 1s;
         ###nginx发送给上游服务器(真实访问的服务器)超时时间
         proxy_send_timeout 1s;
          ### nginx接受上游服务器(真实访问的服务器)超时时间
         proxy_read_timeout 1s;

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }


    }

upstream testproxy {
      server 192.168.178.1:8080；
      server 192.168.178.1:8081 backup;
  }