Lvs+keepalived 高可用性负载均衡自动化配置

时间 2020-01-23

标签 lvs+keepalived lvs keepalived 用性负载均衡自动化配置栏目负载均衡繁體版

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Lvs+keepalived 高可用性负载均衡配置linux

前言* 随着互联网的发展，提供用户访问的web服务器，必需要保证天天24不间断服务，访问量不断增长，有什么好的web架构既能实现高可用性负载均衡，并且价格又是免费的呢？答案有木有？有！lvs+keepalived 是不错的选择！

1、实验环境：4台centos 5.4 ，以及简单的拓扑图：

LVS-Master 192.168.2.108

LVS-BACKUP 192.168.2.109

LVS-DR-VIP 192.168.2.100

WEB1-Realserver 192.168.2.79

WEB2-Realserver 192.168.2.80

2、安装ipvsadm+keepalived,用脚本自动安装：

因为咱们使用的是lvs+keepalived，因此这里不须要配置lvs-dr脚本，直接在keepalived.conf里面配置便可！

#!/bin/sh

###脚本编写目的:自动安装lvs+keepalived

###编写时间: 2011 年7月6日17:25:39

###初稿人:wugk

###定义变量

DIR1=/usr/src

DIR2=/usr/local

cat << EOF

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

++++Welcome to use Linux installed a key LVS+KEEPALIVED shells scripts

+++++++++++++++++++++*************************++++++++++++++++++++++++

EOF

[ $UID -ne 0 ];then

echo “This script must use root user ,please exit……”

sleep 2

exit 0

download ()

{

cd $DIR1 && wget -c http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz http://www.keepalived.org/software/keepalived-1.1.15.tar.gz

[ $? = 0 ];then

echo "Download LVS Code is OK!"

else

echo "Download LVS Code is failed,Please check!"

exit 1

}

ipvsadm_install ()

{

ln -s $DIR1/kernels/2.6.* $DIR1/linux

cd $DIR1 && tar xzvf ipvsadm-1.24.tar.gz &&cd ipvsadm-1.24 && make && make install

[ $? -eq 0 ];then

echo "Install ipvsadm success,please waiting install keepalived ..............."

else

echo "Install ipvsadm failed ,please check !"

exit 1

}

keepalived_install ()

{

cd $DIR1 && tar -xzvf keepalived-1.1.15.tar.gz &&cd keepalived-1.1.15 && ./configure && make && make install

[ $? -eq 0 ];then

echo "Install keepalived success,please waiting configure keepalived ..............."

else

echo "Install keepalived failed ,please check install version !"

exit 1

}

######若是以上软件包编译报错的话，请检查相关的版本跟系统版本之间的关系，而后手动下载安装.

keepalived_config ()

{

cp $DIR2/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/ && cp $DIR2/etc/sysconfig/keepalived /etc/sysconfig/ && mkdir -p /etc/keepalived &&cp $DIR2/etc/keepalived/keepalived.conf /etc/keepalived/ && cp $DIR2/sbin/keepalived /usr/sbin/

[ $? -eq 0 ];then

echo "Keepalived system server config success!"

else

echo "Keepalived system server config failed ,please check keepalived!"

exit 1

}

PS3="Please select Install Linux Packages:"

select option in download ipvsadm_install keepalived_install keepalived_config

$option

done

以上脚本分别在lvs-master和lvs-backup上执行安装。

3、配置keepalived.conf：内容以下是lvs-master配置

也能够参考配置： http://chinaapp.sinaapp.com/download/keepalived.conf 能够直接打开

! Configuration File for keepalived

global_defs {

notification_email {

wgkgood@163.com

}

notification_email_from wgkgood@163.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

# VIP1

vrrp_instance VI_1 {

state MASTER

interface eth0

lvs_sync_daemon_inteface eth0

virtual_router_id 51

priority 100

advert_int 5

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.2.100

}

#REAL_SERVER_1

virtual_server 192.168.2.100 80 {

delay_loop 6

lb_algo wlc

lb_kind DR

persistence_timeout 60

protocol TCP

real_server 192.168.2.79 80 {

weight 100

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

#REAL_SERVER_2

real_server 192.168.2.80 80 {

weight 100

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

注意***Lvs-backup端一样配置，只须要更改state MASTER为state BACKUP，修改priority 100为priority 90便可。

4、分别在web一、web2上配置好apache，而后分别执行以下脚本：

以下的VIP1指的是lvs-dr-vip地址，及对外提供访问的虚拟ip：

#!/bin/sh

PS3="Please Choose whether or not to start a realserver VIP1 configuration:"

select i in "start" "stop"

case "$i" in

start)

read -p "Please enter the virtual server IP address:" VIP1

ifconfig lo:0 $VIP1 netmask 255.255.255.255 broadcast $VIP1

/sbin/route add -host $VIP1 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"

exit 0

;;

stop)

ifconfig lo:0 down

route del $VIP1 >/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"

exit 1

;;

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

exit 2

esac

done

脚本会提示是否启动，按1即启动，而后输入vip地址 192.168.2.100 ，用ifconfig你会看到：lo:0的ip即表示配置ip成功。

lo:0 Link encap:Local Loopback

inet addr:192.168.2.100 Mask:255.255.255.255

UP LOOPBACK RUNNING MTU:16436 Metric:1

5、最后启动lvs-master、lvs-backup上面的keepalived服务便可：

/etc/init.d/keepalived restart 查看lvs-master日志：

在浏览器里面访问 http://192.168.2.100/ 便可！当你宕掉lvs-master后，lvs-backup会接管变成lvs-master提供服务，当lvs-master故障恢复后，lvs-backup又会变成原来的状态！

所安装的脚本能够在这里下载：

http://chinaapp.sinaapp.com/download/lvs-keepalived.sh 在lvs-master和lvs-backup上执行

http://chinaapp.sinaapp.com/download/realserver.sh 在web服务器端执行

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