lvs(dr)+keepalived

时间：2017-02-24 12:53:59 阅读：269 评论：0 收藏：0 [点我收藏+]

LVS原理请看：http://ixdba.blog.51cto.com/2895551/552947

LVS-MASTER 192.168.100.113

LVS-BACKUP 192.168.100.116

REALSERVER1 192.168.100.114

REALSERVER2 192.168.100.115

VIP 192.168.100.125

一. 在LVS-MASTER跟LVS-BACKUP安装keepalived跟ipvsadm,我选择yum安装

[root@localhost ~]# yum install -y ipvsadm keepalived

安装完成后配置keepalived

LVS-MASTER配置：

[root@localhost ~]# cd /etc/keepalived/

[root@localhost keepalived]# > keepalived.conf

[root@localhost keepalived]# vim keepalived.conf

将此段代码复制进去

global_defs {

notification_email {

edisonchou@hotmail.com

}

notification_email_from sns-lvs@gmail.com

smtp_server 192.168.80.1

smtp_connection_timeout 30

router_id LVS_DEVEL # 设置lvs的id，在一个网络内应该是唯一的

}

vrrp_instance VI_1 {

state MASTER #指定Keepalived的角色，MASTER为主，BACKUP为备

interface eth0 #设置对外服务的接口

virtual_router_id 51 #虚拟路由编号，主备要一致

priority 100 #定义优先级，数字越大，优先级越高，主DR必须大于备用DR

advert_int 1 #检查间隔，默认为1s

authentication { #设置验证类型和密码，master和buckup一定要设置一样

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.100.125 #定义虚拟IP(VIP)为192.168.100.125，可多设，每行一个

}

# 定义对外提供服务的LVS的VIP以及port

virtual_server 192.168.100.125 80 {

delay_loop 6 # 设置健康检查时间，单位是秒

lb_algo wrr # 设置负载调度的算法为wlc

lb_kind DR # 设置LVS实现负载的机制，有NAT、TUN、DR三个模式

nat_mask 255.255.255.0

persistence_timeout 0 #会话保持时间，单位秒

protocol TCP

real_server 192.168.100.114 80 { # 指定real server1的IP地址

weight 3 # 配置节点权值，数字越大权重越高

TCP_CHECK {

connect_timeout 10 #连接超时时间

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

real_server 192.168.100.115 80 { # 指定real server2的IP地址

weight 3 # 配置节点权值，数字越大权重越高

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

启动keepalived 服务

[root@localhost ~]# service keepalived start

正在启动 keepalived： [确定]

[root@localhost ~]# chkconfig keepalived on

[root@localhost ~]# chkconfig --list | grep keepalived

keepalived 0:关闭1:关闭2:启用3:启用4:启用5:启用6:关闭

LVS-BACKUP配置：

只需要将LVS-MASTER配置修改两处即可

state BACKUP #指定Keepalived的角色，MASTER为主，BACKUP为备

priority 90 #定义优先级，数字越大，优先级越高，主DR必须大于备用DR

REALSERVER1跟REALSERVER2 配置

[root@localhost ~]# vi /etc/rc.d/init.d/realserver 把以下脚本贴到realserver里去

#!/bin/bash
#cription: config realserver lo and apply noarp

WEB_VIP=192.168.100.125 #虚拟vip，也就是虚拟ip
. /etc/rc.d/init.d/functions

case "$1" in

start)
   ifconfig lo:0 $WEB_VIP netmask 255.255.255.255 broadcast $WEB_VIP
   /sbin/route add -host $WEB_VIP dev lo:0
   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
   echo "1" > /proc/sys/net/ipv4/conf/eth0/arp_ignore
   echo "2" > /proc/sys/net/ipv4/conf/eth0/arp_announce
   echo "1" > /proc/sys/net/ipv4/conf/default/arp_ignore
   echo "2" > /proc/sys/net/ipv4/conf/default/arp_announce
   sysctl -p >/dev/null 2>&1
   echo "RealServer Start OK"
   ;;
stop)
   ifconfig lo:0 down
   route del $WEB_VIP >/dev/null 2>&1
   echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
   echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
   echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
   echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
   echo "0" > /proc/sys/net/ipv4/conf/eth0/arp_ignore
   echo "0" > /proc/sys/net/ipv4/conf/eth0/arp_announce
   echo "0" > /proc/sys/net/ipv4/conf/default/arp_ignore
   echo "0" > /proc/sys/net/ipv4/conf/default/arp_announce
   echo "RealServer Stoped"
   ;;
status)
       # Status of LVS-DR real server.
       islothere=`/sbin/ifconfig lo:0 | grep $WEB_VIP`
       isrothere=`netstat -rn | grep "lo:0" | grep $WEB_VIP`
       if [ ! "$islothere" -o ! "isrothere" ];then
         # Either the route or the lo:0 device
         # not found.
         echo "LVS-DR real server Stopped."
       else
         echo "LVS-DR Running."
       fi
;;
*)
       # Invalid entry.
       echo "$0: Usage: $0 {start|status|stop}"
       exit 1
;;
esac
exit 0