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KeepalivedHA+LVS 部署安装文档

 
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1．1测试环境

操作系统：CentOS5.5 x86_64

主机名

用途

IP地址

网关

serverA.cyhd.com.cn

LVS主机

IP:eth0:192.168.20.61/24

VIP:eth0:192.168.20.70/24

192.168.20.1

serverB.cyhd.com.cn

LVS备机

IP:eth0:192.168.20.62/24

VIP:eth0:192.168.20.70/24

192.168.20.1

serverE.cyhd.com.cn

Realserver LAMP1

RIP:eth0:192.168.20.65/24

VIP:Lo:0:192.168.20.70/32

192.168.20.1

serverF.cyhd.com.cn

Realserver LAMP2

RIP:eth0:192.168.20.66/24

VIP:Lo:0:192.168.20.70/32

192.168.20.1

 

1．2拓扑图

clip_image002

软件安装

2．1 LVS软件安装

Yum –y install ipvs*

 

2．2 Keepalived软件安装

wget http://www.keepalived.org/software/keepalived-1.1.17.tar.gz

tar xzvf keepalived-1.1.17.tar.gz

cd keepalived-1.1.17

./configure --enable-lvs-syncd --enable-lvs --with-kernel-dir=/lib/modules/`uname -r`/build

make && make install

cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

chmod a+x /etc/init.d/keepalived

cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

ln -s /usr/local/sbin/keepalived /usr/sbin/keepalived

ln -s /usr/local/etc/keepalived/ /etc/keepalived

 

 

LVS-DR模式实现 3．1 DR配置

用脚本配置LVS-DR模式的调度器

#!/bin/bash

GW=192.168.20.1

# website director vip.

SNS_VIP=192.168.20.70

SNS_RIP1=192.168.20.65

SNS_RIP2=192.168.20.66

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

logger $0 called with $1

case "$1" in

start)

# set squid vip

/sbin/ipvsadm --set 30 5 60

/sbin/ifconfig eth0:0 $SNS_VIP broadcast $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP up

/sbin/route add -host $SNS_VIP dev eth0:0

sysctl -w "net.ipv4.ip_forward=0"

sysctl -w "net.ipv4.conf.all.send_redirects=1"

sysctl -w "net.ipv4.conf.default.send_redirects=1"

sysctl -w "net.ipv4.conf.eth1.send_redirects=1"

/sbin/ipvsadm -A -t $SNS_VIP:80 -s wrr

/sbin/ipvsadm -a -t $SNS_VIP:80 -r $SNS_RIP1:80 -g -w 1

/sbin/ipvsadm -a -t $SNS_VIP:80 -r $SNS_RIP2:80 -g -w 1

touch /var/lock/subsys/ipvsadm >/dev/null 2>&1

;;

stop)

/sbin/ipvsadm -C

/sbin/ipvsadm -Z

ifconfig eth0:0 down

ifconfig eth0:1 down

sysctl -w "net.ipv4.ip_forward=0"

sysctl -w "net.ipv4.conf.all.send_redirects=0"

sysctl -w "net.ipv4.conf.default.send_redirects=0"

sysctl -w "net.ipv4.conf.eth1.send_redirects=0"

route del $SNS_VIP

route del $SS_VIP

rm -rf /var/lock/subsys/ipvsadm >/dev/null 2>&1

echo "ipvsadm stoped"

;;

status)

if [ ! -e /var/lock/subsys/ipvsadm ];then

echo "ipvsadm stoped"

exit 1

else

echo "ipvsadm OK"

fi

;;

*)

echo "Usage: $0 {start|stop|status}"

exit 1

esac

exit 0

 

3．2 RS配置

用脚本配置LVS-DR模式的Realserver

#!/bin/bash

SNS_VIP=192.168.20.70

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

case "$1" in

start)

ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

/sbin/route add -host $SNS_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

sysctl -p >/dev/null 2>&1

echo "RealServer Start OK"

;;

stop)

ifconfig lo:0 down

route del $SNS_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 "RealServer Stoped"

;;

*)

echo "Usage: $0 {start|stop}"

exit 1

esac

exit 0

 

3．3测试

在LVS主机上运行配置LVS-DR模式调度器脚本，在两台Realserver上运行配置LVS-DR模式Realserver脚本。

[root@serverA ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.20.70:80 wrr

-> 192.168.20.66:80 Route 1 0 0

-> 192.168.20.65:80 Route 1 0 0

 

查看调度器IP信息

[root@serverB ~]# ip addr

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:5f:6d:c7 brd ff:ff:ff:ff:ff:ff

inet 192.168.20.62/24 brd 192.168.20.255 scope global eth0

inet 192.168.20.70/32 brd 192.168.20.70 scope global eth0:0

inet6 fe80::20c:29ff:fe5f:6dc7/64 scope link

valid_lft forever preferred_lft forever

 

测试调度器作用

[root@serverG ~]# for((i=1;i<=90;i++));do curl http://192.168.20.70/test.html;done 2>/dev/null | sort -n | uniq -c

45 192.168.20.65

45 192.168.20.66

 

停掉serverF上的HTTPD服务

[root@serverF ~]# service httpd stop

 

测试调度器作用

[root@serverA ~]# for((i=1;i<=90;i++));do curl http://192.168.20.70/test.html;done 2>/dev/null | sort -n | uniq -c

45 192.168.20.65

 

查看调度器信息

[root@serverB ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-&gt; RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.20.70:80 wrr

-&gt; 192.168.20.66:80 Route 1 0 45

-&gt; 192.168.20.65:80 Route 1 0 0

 

后端RS死掉了，LVS并不会自动发现，请求仍然转发过去，致使有些请求没有正确的返回。

 

KeepalivedHA+LVS 4．1 LVS主机配置

Keepalived主机配置

! Configuration File for keepalived

global_defs {

router_id cy2009

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 61

priority 200

advert_int 1

nopreempt

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.20.70/24 dev eth0

}

}

virtual_server 192.168.20.70 80 {

delay_loop 6

lb_algo wrr

lb_kind DR

# persistence_timeout 60

nat_mask 255.255.255.0

protocol TCP

real_server 192.168.20.65 80 {

weight 20

TCP_CHECK {

connect_port 80

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.20.66 80 {

weight 10

TCP_CHECK {

connect_port 80

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

 

4．2 LVS备机配置

Keepalived备机配置

! Configuration File for keepalived

global_defs {

router_id cy2009

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 61

priority 100

advert_int 1

# nopreempt

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.20.70/24 dev eth0

}

}

virtual_server 192.168.20.70 80 {

delay_loop 6

lb_algo wrr

lb_kind DR

# persistence_timeout 60

nat_mask 255.255.255.0

protocol TCP

real_server 192.168.20.65 80 {

weight 20

TCP_CHECK {

connect_port 80

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.20.66 80 {

weight 10

TCP_CHECK {

connect_port 80

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

 

4．3 RS配置

和LVS配置RS相同，使用RS配置脚本

#!/bin/bash

SNS_VIP=192.168.20.70

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

case "$1" in

start)

ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

/sbin/route add -host $SNS_VIP dev lo:0

echo "1" &gt;/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "2" &gt;/proc/sys/net/ipv4/conf/lo/arp_announce

echo "1" &gt;/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" &gt;/proc/sys/net/ipv4/conf/all/arp_announce

sysctl -p &gt;/dev/null 2&gt;&1

echo "RealServer Start OK"

;;

stop)

ifconfig lo:0 down

route del $SNS_VIP &gt;/dev/null 2&gt;&1

echo "0" &gt;/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" &gt;/proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" &gt;/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" &gt;/proc/sys/net/ipv4/conf/all/arp_announce

echo "RealServer Stoped"

;;

*)

echo "Usage: $0 {start|stop}"

exit 1

esac

exit 0

 

4．4切换测试

先启动LVS主机上的Keepalived

[root@serverA ~]# service keepalived start

 

LVS主机IP信息

[root@serverA ~]# ip addr

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:06:d1:2c brd ff:ff:ff:ff:ff:ff

inet 192.168.20.61/24 brd 192.168.20.255 scope global eth0

inet 192.168.20.70/24 scope global secondary eth0

inet6 fe80::20c:29ff:fe06:d12c/64 scope link

valid_lft forever preferred_lft forever

 

LVS信息

[root@serverA ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-&gt; RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.20.70:80 wrr

-&gt; 192.168.20.66:80 Route 10 0 0

-&gt; 192.168.20.65:80 Route 20 0 0

 

测试信息

[root@serverG ~]# for((i=1;i<=90;i++));do curl http://192.168.20.70/test.html;done 2>/dev/null | sort -n | uniq -c

60 192.168.20.65

30 192.168.20.66

 

停止掉serverF的HTTPD服务

[root@serverF ~]# service httpd stop

 

测试信息

[root@serverG ~]# for((i=1;i<=90;i++));do curl http://192.168.20.70/test.html;done 2>/dev/null | sort -n | uniq -c

90 192.168.20.65

 

LVS信息

[root@serverA ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-&gt; RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.20.70:80 wrr

-&gt; 192.168.20.65:80 Route 20 0 60

 

重新启动serverF的HTTPD服务

[root@serverF ~]# service httpd start

 

测试信息

[root@serveG ~]# for((i=1;i<=90;i++));do curl http://192.168.20.70/test.html;done 2>/dev/null | sort -n | uniq -c

60 192.168.20.65

30 192.168.20.66

 

LVS信息

[root@serverB ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-&gt; RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.20.70:80 wrr

-&gt; 192.168.20.66:80 Route 10 0 0

-&gt; 192.168.20.65:80 Route 20 0 0

 

启动LVS备机上的Keepalived

[root@serverB ~]# service keepalived start

 

关闭LVS主机上的Keepalived

[root@serverA ~]# service keepalived stop

 

查看LVS主机IP信息

[root@serverA ~]# ip addr

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:06:d1:2c brd ff:ff:ff:ff:ff:ff

inet 192.168.20.61/24 brd 192.168.20.255 scope global eth0

inet6 fe80::20c:29ff:fe06:d12c/64 scope link

valid_lft forever preferred_lft forever

 

查看LVS备机IP信息

[root@serverB ~]# ip addr

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:5f:6d:c7 brd ff:ff:ff:ff:ff:ff

inet 192.168.20.62/24 brd 192.168.20.255 scope global eth0

inet 192.168.20.70/24 scope global secondary eth0

inet6 fe80::20c:29ff:fe5f:6dc7/64 scope link

valid_lft forever preferred_lft forever

 

LVS信息

[root@serverB ~]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-&gt; RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.20.70:80 wrr

-&gt; 192.168.20.66:80 Route 10 0 0

-&gt; 192.168.20.65:80 Route 20 0 0

 

重新启动LVS主机Keepalived

[root@serverA ~]# service keepalived start

 

查看LVS主机IP信息

[root@serverA ~]# ip addr

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000

link/ether 00:0c:29:06:d1:2c brd ff:ff:ff:ff:ff:ff

inet 192.168.20.61/24 brd 192.168.20.255 scope global eth0

inet6 fe80::20c:29ff:fe06:d12c/64 scope link

valid_lft forever preferred_lft forever

 

LVS主机并没有和备机争VIP

测试

[root@serverG ~]# for((i=1;i<=90;i++));do curl http://192.168.20.70/test.html;done 2>/dev/null | sort -n | uniq -c

60 192.168.20.65

30 192.168.20.66
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