负载均衡

1. 三台虚拟机

2. 分别取名dir rs1 rs2

3. 给dir1和dir2分别加入网关=dir的IP

   vi /etc/sysconfig/network-scripts/ifcfg-ens33
   GETWAY=192.168.200.147
   ##也可以在虚拟机设置那边改

    

4. 清空iptables的规则

   iptables -F; iptables -t nat -F; service iptables save       

    

5. 安装yum源

   rm -f /etc/yum.repos.d/*
   cat /etc/yum.repos.d/local.repo
   [gpmall]
   name=gpmall
   baseurl=file:///opt/gpmall-repo
   gpgcheck=0
   enabled=1
   yum clean all
   yum repolist

    

6. 安装iptables-service

   yum -y install iptables-services

    

7. 清空规则

   iptables -F; iptables -t nat -F; service iptables save

    

8. 关闭防火墙

   systemctl stop firewalld
   systemctl disable firewalld
   setenforce 0
   getenforce 0

    

Ⅰ：安装LVS

1. dir安装ipvsadm

   yum install -y ipvsadm

    

2. dir编写脚本

   vim /usr/local/sbin/lvs_nat.sh
   #! /bin/bash
   # director 服务器上开启路由转发功能
   echo 1 > /proc/sys/net/ipv4/ip_forward
   # 关闭icmp的重定向
   echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects
   echo 0 > /proc/sys/net/ipv4/conf/default/send_redirects
   # 注意区分网卡名字
   echo 0 > /proc/sys/net/ipv4/conf/ens33/send_redirects
   echo 0 > /proc/sys/net/ipv4/conf/ens34/send_redirects
   # director 设置nat防火墙
   iptables -t nat -F
   iptables -t nat -X
   iptables -t nat -A POSTROUTING -s 192.168.200.0/24  -j MASQUERADE
   # director设置ipvsadm
   IPVSADM='/usr/sbin/ipvsadm'
   $IPVSADM -C
   $IPVSADM -A -t 192.168.147.144:80 -s wlc 
   ###-p 300###
   $IPVSADM -a -t 192.168.147.144:80 -r 192.168.200.131:80 -m -w 1 #rs1
   $IPVSADM -a -t 192.168.147.144:80 -r 192.168.200.132:80 -m -w 1 #rs2
   #-t 后面为主机模式IP地址
   
   bash/usr/local/sbin/lvs_nat.sh  #启动脚本
   killall nginx

    

3. rs1+2 安装niginx，配置网页数据

   yum -y install nginx
   echo "rs1" > /usr/share/nginx/html/index.html   
   echo "rs2" > /usr/share/nginx/html/index.html  

    

4. 测试nginx

   curl 192.168.200.150
   rs2
   curl 192.168.200.148
   rs1
    curl 192.168.183.129
   rs2
   curl 192.168.183.129
   rs1
    curl 192.168.183.129
   rs2
   curl 192.168.183.129
   rs1

    

   1. 关闭前面网关

   2. 编写dir脚本

      vim /usr/local/sbin/lvs_rs.sh 
      #! /bin/bash
      echo 1 > /proc/sys/net/ipv4/ip_forward
      ipv=/usr/sbin/ipvsadm
      vip=192.168.200.110 虚拟
      rs1=192.168.200.148
      rs2=192.168.200.150
      #注意这里的网卡名字
      ifconfig ens33:2 $vip broadcast $vip netmask 255.255.255.255 up
      route add -host $vip dev ens33:2
      $ipv -C
      $ipv -A -t $vip:80 -s wrr
      $ipv -a -t $vip:80 -r $rs1:80 -g -w 1
      $ipv -a -t $vip:80 -r $rs2:80 -g -w 1

       

   3. 编写rs1+2脚本

      vim /usr/local/sbin/lvs_rs.sh 
      #/bin/bash
      vip=192.168.200.110  #虚拟-
      #把vip绑定在lo上，是为了实现rs直接把结果返回给客户端
      ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
      route add -host $vip lo:0
      #以下操作为更改arp内核参数，目的是为了让rs顺利发送mac地址给客户端
      #参考文档www.cnblogs.com/lgfeng/archive/2012/10/16/2726308.html
      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

       

   4. 3节点运行脚本并测试

      bash /usr/local/sbin/lvs_dr.sh