lvs+keepalived 负载均+衡高可用
lvs-MASTER 192.168.10.6
lvs-BACKUP 192.168.10.7
VIP 192.168.10.8
WEB1 192.168.10.9
WEB2 192.168.10.10
GATEWAY 192.168.10.1
NETMASK 255.255.255.0
准备工作：
系统环境：CentOS 5.4（定制安装）
组件：
Base
Development Libraries
Development Tools
Editors
Text-based Internet
时间同步：
[root@web10 html]# mount /dev/cdrom /mnt/ && cd /mnt/CentOS/ && rpm -ivh ntp-4.2.2p1-9.el5.centos.2.i386.rpm && ntpdate time.nist.gov
===========================
lvs安装配置:
[root@web6 CentOS]# modprobe ip_vs //内核加载ip_vs模块
[root@web6 CentOS]# lsmod | grep ip_vs //查看是否加载成功
ip_vs 77441 0
下载相关软件包：
[root@web6 ~]# mkdir /usr/local/src/lvs
[root@web6 ~]# cd /usr/local/src/lvs
[root@web6 lvs]# wget -c
[root@web6 lvs]# ln -s /usr/src/kernels/2.6.18-164.el5-i686/ /usr/src/linux //做个内核软链，必须的。
安装ipvsadm软件：
[root@web6 lvs]# tar xzvf ipvsadm-1.24.tar.gz
[root@web6 lvs]# cd ipvsadm-1.24
[root@web6 ipvsadm-1.24]# make && make install
安装keepalived软件：
[root@web6 lvs]# tar xzvf keepalived-1.1.15.tar.gz
[root@web6 lvs]# cd keepalived-1.1.15
[root@web6 keepalived-1.1.15]# ./configure --prefix=/usr/local/keepalived --with-man=/usr/share/man --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686
最后的配置情况：
Keepalived configuration
------------------------
Keepalived version : 1.1.15
Compiler : gcc
Compiler flags : -g -O2
Extra Lib : -lpopt -lssl -lcrypto
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
Use VRRP Framework : Yes
Use LinkWatch : No
Use Debug flags : No
[root@web6 keepalived-1.1.15]# make && make install
配置文件的拷贝：
[root@web6 keepalived-1.1.15]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
[root@web6 keepalived-1.1.15]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@web6 keepalived-1.1.15]# mkdir /etc/keepalived
[root@web6 keepalived-1.1.15]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@web6 keepalived-1.1.15]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
keepalived 主配置文件的配置：
[root@web6 ~]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
xxx@xxx.com
}
notification_email_from xxx@xxx.com
smtp_server 127.0.0.1
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
# VIP1
vrrp_instance VI_1 {
state MASTER #备份服务器上将MASTER改为BACKUP
interface eth0
virtual_router_id 51
priority 100 # 备份服务上将100改为99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.10.8
#(如果有多个VIP，继续换行填写.)
}
}
virtual_server 192.168.10.8 80 {
delay_loop 6 #(每隔10秒查询realserver状态)
lb_algo wrr #(lvs 算法)
lb_kind DR #(Direct Route)
persistence_timeout 60 #(同一IP的连接60秒内被分配到同一台realserver)
protocol TCP #(用TCP协议检查realserver状态)
real_server 192.168.10.9 80 {
weight 3 #(权重)
TCP_CHECK {
connect_timeout 10 #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.10.10 80 {
weight 3
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
=============================
或者用脚本(这个脚本在实际当中是不启动的，lvs只用keepalived.conf 这个配置文件)
[root@web6 ~]#vi /usr/local/sbin/lvs-dr.sh
#!/bin/bash
# description: start LVS of DirectorServer
GW=192.168.10.1
# website director vip.
SNS_VIP=192.168.10.8
SNS_RIP1=192.168.10.9
SNS_RIP2=192.168.10.10
. /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
/sbin/ipvsadm -A -t $SNS_VIP:80 -s wrr -p 3
/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
route del $SNS_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
=======================================
[root@web6 ~]# cd /usr/local/sbin
[root@web6 ~]# vi realserver.sh
#vi /usr/local/sbin/realserver.sh
#!/bin/bash
# description: Config realserver lo and apply noarp
SNS_VIP=192.168.10.8
. /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
=========
启动方式：
lvs: service keepalived start (两个lvs)
realserver : ./realserver.sh start (两个web)
=========
查看lvs状态
watch ipvsadm -ln
watch -n 0.1 -L -n --stats
查看lvs vip状态
[root@web6 ~]# ip ad li eth0
2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:65:ec:25 brd ff:ff:ff:ff:ff:ff
inet 192.168.10.6/24 brd 192.168.10.255 scope global eth0
inet 192.168.10.8/32 scope global eth0
inet6 fe80::20c:29ff:fe65:ec25/64 scope link
valid_lft forever preferred_lft forever
测试：elinks -dump
参考 netseek
如有问题请留言
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