再试lvs+keepalived(过程与总结)

一.LVS与keepalived安装脚本

#!/bin/bash

#description: start LVS of DirectorServer

#Written by [e-mail]

echo "================================="

echo "lvs + keepalived start installing"

echo "================================="

#编译安装ipvsadm前需要做个ln，笨方法，但是能适应不同版本

mkdir -p /home/install/lvs && cd /usr/src/kernels

ll | grep $(uname -r) > /home/install/lvs/linux-version

linuxversion=$(awk '{FS=" "} {print $9}' /home/install/lvs/linux-version)

ln -s /usr/src/kernels/$linuxversion/ /usr/src/linux

cd /home/install/lvs

url=""

wget $url/ipvsadm-1.24.tar.gz

wget $url/keepalived-1.1.15.tar.gz

tar zxvf ipvsadm-1.24.tar.gz

cd ipvsadm-1.24

make && make install

cd ..

tar zxvf keepalived-1.1.15.tar.gz

cd keepalived-1.1.15

./configure

make && make install

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

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

mkdir /etc/keepalived

cp /usr/local/etc/keepalived.conf /etc/keepalived/

cp /usr/local/sbin/keepalived /usr/bin/

cd ..

echo "================================="

echo "=====         Done        ======="

echo "================================="

二.keepalived.conf总结（自己理解，可能有误）

   关于vrrp：

虚拟路由器冗余协议，用于master与slave的通信以及状态检查，单台LVS应该可以不理会此项。

   关于persistence_timeout：Number 单位s

使用过程中发现无论设定任何数，会话保持时间都在一分钟。经检查发现在real-server中的web服 务resin.conf有这么一段60s，另外也发现nginx.conf 也有keepalived时间设定keepalive_timeout 30

   配置过程中出现只能访问一台机器（做不到轮询）以及日志疯长这种幽灵错误，将配置文件中的space换成tab后解决，格式问题？

   service keepalived start

三.LVS启动脚本(director)

   当启动keepalived时，ipvsadm -Ln后会发现lvs同样也会启动。

   在DR模式下，real-web的服务端口与lvs director的端口一致，设定值无效。

#!/bin/bash

#Linux Virtual Server Director configuretion && start

#[e-mail]

VIP=

RIP_1=

RIP_2=

RIP_3=

...

case "$1" in

start)

ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255

route add -host $VIP dev eth0:0

echo 1 > /proc/sys/net/ipv4/ip_forward

ipvsadm -C

#Config virtual IP:Port && Load balance mode

ipvsadm -A -t $VIP:80 -s rr

#Config real IP:Port && Load forward mode

ipvsadm -a -T $VIP:80 -r $RIP_1:80 -g

ipvsadm -a -T $VIP:80 -r $RIP_2:80 -g

ipvsadm -a -T $VIP:80 -r $RIP_3:80 -g

ipvsadm -L

service ipvsadm save

service ipvsadm start

echo "ipvsadm started"

;;

stop)

ipvsadm -C

ipvsadm -Z

ifconfig eth0:0 down

route del $VIP

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

echo "ipvsadm stopped"

;;

status)

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

echo "ipvsadm is stopping"

exit 1

else

echo "ipvsadm is running"

fi

;;

*)

echo "/PATH/lvsdron.sh |start|stop|status|"

esac

四.lVS配置脚本（real_server）

#!/bin/bash

#The linux virtual server configuretion in real-web-server

VIP=

case "$1" in

start)

ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255

route add -host $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

echo "============ Real-Server START ============="

;;

stop)

ifconfig lo:0 down

route del $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 "============ Real-Server STOP ============="

;;

*)

echo "/PATH/realson.sh |start|stop|"

exit 1

esac

五.开机启动

chkconfig keepalived on

chkconfig --level num keepalived on#也可自定义runlevel启动

vi /etc/rc.d/rc.local

加入/PATH/*.sh

带有keepalived的lvs需要重启keepalived才能更新lvs配置