1. 下載相關軟體包
#mkdir /usr/local/src/lvs
#cd /usr/local/src/lvs
#wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
#wget http://www.keepalived.org/software/keepalived-1.1.15.tar.gz
2. 安裝LVS和Keepalived
#lsmod |grep ip_vs
#uname -r
2.6.18-53.el5PAE
需要安裝 ：
yum install -y kernel-devel
#ln -s /usr/src/kernels/2.6.18-53.el5PAE-i686/ /usr/src/linux
#tar zxvf ipvsadm-1.24.tar.gz
#cd ipvsadm-1.24
#make && make install
#find / -name ipvsadm # 查看ipvsadm的位置
#tar zxvf keepalived-1.1.15.tar.gz
需要安裝 ：
yum -y install openssl-devel
#cd keepalived-1.1.15
#./configure && make && make install
#find / -name keepalived # 查看keepalived位置
#cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
#cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
#mkdir -p /etc/keepalived
#cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
#cp /usr/local/sbin/keepalived /usr/sbin/
#service keepalived start|stop #做成系統啟動服務方便管理.
3. 配置Realserver腳本.
#vi /usr/local/sbin/realserver.sh
#!/bin/bash
# description: Config realserver lo and apply noarp
#Written by :NetSeek http://www.linuxtone.org
SNS_VIP=192.168.1.163
. /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
4. 配置在主負載均衡伺服器上配置keepalived.conf
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
cnseek@gmail.com
}
notification_email_from sns-lvs@gmail.com
smtp_server 127.0.0.1
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
# 20081013 written by :netseek
# VIP1
vrrp_instance VI_1 {
state MASTER #備份伺服器上將MASTER改為BACKUP
interface eth0
virtual_router_id 51
priority 100 # 備份服務上將100改為99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
61.164.122.8
#(如果有多個VIP，繼續換行填寫.)
}
}
virtual_server 61.164.122.8 80 {
delay_loop 6 #(每隔10秒查詢realserver狀態)
lb_algo wrr #(lvs 演算法)
lb_kind DR #(Direct Route)
persistence_timeout 60 #(同一IP的連接60秒內被分配到同一台realserver)
protocol TCP #(用TCP協議檢查realserver狀態)
real_server 61.164.122.9 80 {
weight 3 #(權重)
TCP_CHECK {
connect_timeout 10 #(10秒無響應超時)
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 61.164.122.10 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
5. BACKUP伺服器同上配置，先安裝lvs再按裝keepalived,仍后配置/etc/keepalived/keepalived.conf，
只需將標示的部分改一下即可.
6.
#/etc/init.d/keepalived start 啟動keepalived服務，keepalived就能利用keepalived.conf 配置文件，實現負載均衡和高可用.
查看lvs服務是否正常
#watch ipvsadm -ln
停Master伺服器的keepalived服務，查看BAKCUP伺服器是否能正常接管服務
