keepalived+LVS DR的配置

LVS的原理，以及3种方式就不再赘述了。

一、环境说明

master（keepalive+lvs）：192.168.3.166

real_server1:192.168.3.173

real_server2:192.168.3.178

vip:192.168.3.101

GATEWAY：192.168.3.1

软件环境：keepalived-1.2.8.tar.gz

ipvsadm-1.24-13.el5

需要分配请求的端口：192.168.3.173和192.168.3.178的80端口（TCP）

二、安装配置

1.编辑master网卡配置

vim/etc/sysconfig/network-script/ifcfg-eth0

DEVICE="eth0"

BOOTPROTO="static"

IPADDR=192.168.3.166

NETMASK=255.255.255.0

GATEWAT=192.168.3.1

NETWORK=192.168.3.0

DNS=8.8.8.8

2.更改主机名

vim/etc/hosts

192.168.3.166master(非必须)

3.安装软件

下载keepalive

wgethttp://www.keepalived.org/software/keepalived-1.2.8.tar.gz

yuminstallopenssl-*gcc-*kernel-devel-*popt-*-y

yuninstallipvsadm-y

tarxfkeepalived-1.2.8.tar.gz-C/usr/src

cd/usr/src/keepalived-1.2.8

./configure--prefix=/--with-kernel-dir=/usr/src/kernels/2.6.18-371.el5-i686

make&&makeinstall

三、配置keepalived

vim/etc/keepalived/keepalived.conf

global_defs{

notification_email{

[e-mail]

[e-mail]

[e-mail]

}

[e-mail]

smtp_server192.168.3.166(这个地址为邮件服务器地址，用来发邮件，如果没有填本地或者随意一个地址都可，不影响使用)

smtp_connect_timeout30

router_idmaster

}

vrrp_instanceVI_1{

stateMASTER

interfaceeth0

virtual_router_id51

priority100

advert_int1

authentication{

auth_typePASS

auth_pass1111

}

virtual_ipaddress{

192.168.3.101

}

}

-----------------------------下面这段，如果有多个realserver添加即可，如果有多个VIP地址，则添加VIP地址，并在VIP地址内填写RS信息

virtual_server192.168.3.10180{

delay_loop6

lb_algorr

lb_kindDR

nat_mask255.255.255.0

persistence_timeout60

protocolTCP

real_server192.168.3.17380{

weight1

TCP_CHECK{

connect_timeout10

nb_get_retry3

delay_before_retry3

connect_port80

}

real_server192.168.3.17880{

weight1

TCP_CHECK{

connect_timeout10

nb_get_retry3

delay_before_retry3

connect_port80

}

}

}

四、启动lvs

/etc/init.d/keepalivedstart

/etc/init.d/ipvsadmstart

五、架设real_server

vim/etc/rc.d/rc.local---添加

vip=192.168.3.101

ifconfiglo:0$vipbroadcast$vipnetmask255.255.255.255up

routedel-host$vip

routeadd-host$vipdevlo:0

echo1>/proc/sys/net/ipv4/conf/lo/arp_ignore

echo2>/proc/sys/net/ipv4/conf/lo/arp_announce

echo1>/proc/sys/net/ipv4/conf/all/arp_ignore

echo2>/proc/sys/net/ipv4/conf/all/arp_announce

sysctl-p

/etc/init.d/httpdstart

或

cat>>/etc/rc.d/rc.local<<EOF

vip=192.168.3.101

ifconfiglo:0$vipbroadcast$vipnetmask255.255.255.255up

routedel-host$vip

routeadd-host$vipdevlo:0

echo1>/proc/sys/net/ipv4/conf/lo/arp_ignore

echo2>/proc/sys/net/ipv4/conf/lo/arp_announce

echo1>/proc/sys/net/ipv4/conf/all/arp_ignore

echo2>/proc/sys/net/ipv4/conf/all/arp_announce

sysctl-p

/etc/init.d/httpdstart

EOF

这一段把RS需要的配置写入到开机启动项，防止系统意外关机重启而无法连接上lvs

六、在master机器上使用ipvsadm查看

[root@localhost~]#ipvsadm-l

IPVirtualServerversion1.2.1(size=4096)

ProtLocalAddress:PortSchedulerFlags

->RemoteAddress:PortForwardWeightActiveConnInActConn

TCP192.168.3.101:httprr

->192.168.3.178:httpRoute101

->192.168.3.173:httpRoute101

[root@localhost~]#

如果使用ipvsadm没有信息

[root@localhost~]#ipvsadm-l

IPVirtualServerversion1.2.1(size=4096)

ProtLocalAddress:PortSchedulerFlags

->RemoteAddress:PortForwardWeightActiveConnInActConn

[root@localhost~]#

把下面这段写到脚本里执行

#!/bin/bash

echo1>/proc/sys/net/ipv4/ip_forward----开启IP转发

ipvsadm-C-----------清空之前的ipvsadm表

ipvsadm-At192.168.3.101:80-srr-------使用算法，轮询

ipvsadm-at192.168.3.101:80-r192.168.3.173:80-g------------增加一台RS

ipvsadm-at192.168.3.101:80-r192.168.3.178:80-g