LVS+keepalived 实战

安装依赖：

yum -y install wget libnl* popt* gcc.x86_64 gcc-c++.x86_64 gcc-objc++.x86_64 kernel-devel.x86_64 make popt-static.x86_64
yum -y install openssl-devel

一、分别在backup lvs和master lvs上安装LVS

wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
uname -r
3.10.0-514.2.2.el7.x86_64
ln -s /usr/src/kernels/3.10.0-514.6.2.el7.x86_64-i686/ /usr/src/linux
tar zxvf ipvsadm-1.24.tar.gz
cd ipvsadm-1.24
make && make install

二、分别在backup lvs和master lvs上安装keepalived

wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz
tar zxvf keepalived-1.1..tar.gz
cd keepalived-1.1.
./configure --prefix=/usr/local/keepalived
make
make install
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
mkdir /etc/keepalived

三、修改keepalived相关配置

vi /etc/sysconfig/keepalived
KEEPALIVED_OPTIONS="-D -f /usr/local/keepalived/etc/keepalived/keepalived.conf"

vi /etc/init.d/keepalived
#更新
. /etc/sysconfig/keepalived
PATH="$PATH:/usr/sbin"
export PATH

vi /usr/local/keepalived/etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
   notification_email {
     50625185@qq.com
   }
   notification_email_from 50625185@qq.com
   smtp_server localhost
   smtp_connect_timeout
   router_id NodeA
}
vrrp_instance VI_1 {
    state MASTER
    interface ens160
    virtual_router_id
    priority
    advert_int
    authentication {
        auth_type PASS
        auth_pass
    }
    virtual_ipaddress {
         192.168.20.229 //虚拟IP
    }
}
virtual_server 192.168.20.229 80 {    //定义虚拟服务器
    delay_loop                   //健康检查时间，单位是秒
    lb_algo rr              //负载调度算法，这里设置为rr，即轮询算法
    lb_kind DR              //LVS实现负载均衡的机制，可以有NAT、TUN和DR三个模式可选
    persistence_timeout         //会话保持时间，单位是秒（可以适当延长时间以保持session）
    protocol TCP                  //转发协议类型，有tcp和udp两种
    real_server 192.168.20.200  {  //定义WEB服务器
       weight                   //权重
       TCP_CHECK {                //通过tcpcheck判断RealServer的健康状态
           connect_timeout       //连接超时时间
           nb_get_retry         //重连次数
           delay_before_retry   //重连间隔时间
           connect_port         //检测端口
       }
    }
    real_server 192.168.20.201  {  //定义WEB服务器
       weight                  //权重
       TCP_CHECK {                //通过tcpcheck判断RealServer的健康状态
           connect_timeout       //连接超时时间
           nb_get_retry         //重连次数
           delay_before_retry   //重连间隔时间
           connect_port         //检测端口
       }
    }
}

虚拟VIP：192.168.20.229

分流WEB：192.168.20.200、192.168.20.201

四、启动keepalived

/etc/init.d/keepalived start

五、客户机脚本

#!/bin/bash
# description: Config realserver lo and apply noarp

SNS_VIP=192.168.20.229

/etc/rc.d/init.d/functions

case "$1" in
start)
       ifconfig lo: $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
       /sbin/route add -host $SNS_VIP dev lo:
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/all/arp_announce
       sysctl -p >/dev/null >&
       echo "RealServer Start OK"

       ;;
stop)
       ifconfig lo: down
       route del $SNS_VIP >/dev/null >&
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/lo/arp_announce
       echo "" >/proc/sys/net/ipv4/conf/all/arp_ignore
       echo "" >/proc/sys/net/ipv4/conf/all/arp_announce
       echo "RealServer Stoped"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit
esac

exit 

六、测试

ipvsadm
IP Virtual Server version 1.2. (size=)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  docker223: rr persistent
  -> 192.168.20.200:          Route                       

浏览器访问 http://192.168.20.229 分流 http://192.168.20.200:8151 WEB服务