分类: LINUX
2010-12-16 13:57:58
#!/bin/bash
# BY kerryhu
# MAIL:king_819@163.com
# BLOG:http://kerry.blog.51cto.com
# Please manual operation yum of before Operation.....
系统环境`:CentOS 5.5(定制安装)
组件:
Base
Development Libraries
Development Tools
Editors
Text-based Internet
lvs-master:192.168.9.201
lvs-backup:192.168.9.202
vip:192.168.9.200
web1:192.168.9.203
web2:192.168.9.204
netmask:255.255.255.0
gateway:192.168.9.1
网络拓扑:
echo "============================ 更新系统时间 ======================"
yum install -y ntp
ntpdate time.nist.gov
echo "00 01 * * * /usr/sbin/ntpdate time.nist.gov" /etc/crontab
echo “============================ 关闭不用服务 =======================”
/root/del_servcie.sh # 附件中自定义脚本
echo “========================= 安装ipvsadm、keepalived ==================”
[root@master ~]# cd /usr/local/src
[root@master ~]# wget
[root@master ~]# wget
[root@master ~]# ln -sv /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux
[root@master ~]# tar -zxvf ipvsadm-1.24.tar.gz
[root@master ~]# cd ipvsadm-1.24
[root@master ~]# make;make install
[root@master ~]# cd ..
[root@master ~]# tar -zxvf keepalived-1.1.17.tar.gz
[root@master ~]# cd keepalived-1.1.17
[root@master ~]# ./configure
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files.
解决办法:
[root@master ~]# yum -y install openssl-devel
[root@master ~]# ./configure
[root@master ~]# make;make install
编译的时候出现这个提示,说明keepalived和内核结合了,如果不是这样的,需要加上这个参数./configure --with-kernel-
dir=/kernel/path
Keepalived configuration
------------------------
Keepalived version : 1.1.17
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
echo “======================= 配置keepalived ===========================”
[root@master ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
[root@master ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
[root@master ~]# mkdir /etc/keepalived
[root@master ~]# cp /usr/local/sbin/keepalived /usr/sbin/
[root@master ~]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
}
notification_email_from
smtp_server smtp.163.com
# 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
lvs_sync_daemon_inteface eth0
virtual_router_id 51
priority 100 # 备份服务上将100改为90
advert_int 5
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.9.200
#(如果有多个VIP,继续换行填写.)
}
}
virtual_server 192.168.9.200 80 {
delay_loop 6 #(每隔10秒查询realserver状态)
lb_algo wlc #(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 192.168.9.203 80 {
weight 100 #(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 192.168.9.204 80 {
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
[root@master ~]# service keepalived start|stop
[root@master ~]# chkconfig –level 2345 keepalived on
“====================keepalived监控后端Realserver=================”
keepalived有4种检测后端realserver的方式,很实用。
HTTP_GET|SSL_GET
使用该方式时,需要先生产待验证页面的MD5值。
genhash -s 192.168.0.50 -p 1222 -u /ha.html
MD5SUM = be0687590b20e68995f0fc21b464ece3
格式:
HTTP_GET
{
url {
path /
digest 上面生成的MD5值
status_code 200 #http 返回值
}
connect_port 80
bindto IPADDR
connect_timeout 10
nb_get_retry ? ?#重试次数
delay_before_retry 2 #重试间隔时间2秒
}
TCP_CHECK
格式:
TCP_CHECK
{
connect_port 80
bindto IPADDR
connect_timeout 10
}
SMTP_CHECK
格式:
SMTP_CHECK
{
connect_ip #IPADDR
connect_port?25
connect_port?80
bindto IPADDR
connect_timeout 10
nb_get_retry #重试次数
delay_before_retry 2 #重试间隔时间2秒
helo_name?#可选
}
MISC_CHECK (自定义脚本)
格式:
MISC_CHECK
{
misc_path /path/shell.sh
misc_timeout 10?#脚本超时时间。
misc_dynamic
#如果设置了misc_dynamic的话,健康检测程序的退出码会用来动态调节realserver的权重(weight)
返回0 OK 权重不被修改
返回1 健康检查失败,权重设为0。
返回2-255权重设置为:退出码-2.例如返回255那么weight=255-2=253
}
echo “====================== 配置realserver =========================”
[root@web_1 ~]# vi /root/lvs_real.sh
#!/bin/bash
# description: Config realserver
#Written by : http://kerry.blog.51cto.com
SNS_VIP=192.168.9.200
/etc/rc.d/init.d/functions
case "$1" in
start)
/sbin/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)
/sbin/ifconfig lo:0 down
/sbin/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
[root@web_1 ~]# chmod +x /roo/lvs_real.sh
[root@web_1 ~]# /root/lvs_real.sh start
[root@web_1 ~]# ifconfig
[root@web_1 ~]# echo “/root/lvs_real.sh start” >> /etc/rc.local
echo “===================== 测试LVS+keepalived ========================”
#LVS_master、LVS_backup上开启keepalived,LVS_master先绑定VIP
LVS_master:
LVS_backup:
#解析域名,测试访问,LVS转发
#测试关闭LVS_master,短暂的掉包后,LVS_backup马上接替工作
LVS_backup接替LVS_master绑定VIP
LVS_backup负责转发
LVS_master重启完成后,就会自动接回控制权,继续负责转发
#测试关闭其中一台realserver
通过上面测试可以知道,当realserver故障或者无法提供服务时,负载均衡器通过健康检查自动把失效的机器从转发队列删除掉,
实现故障隔离,保证用户的访问不受影响
#重启被关闭的realserver
当realserver故障恢复后,负载均衡器通过健康检查自动把恢复后的机器添加到转发队列中
本文出自 “聆听未来” 博客,请务必保留此出处http://kerry.blog.51cto.com/172631/401253
能满足互为主备的需求(主机恢复后自动变为备机,不需要再断一次,切换回主机)。
通过以下参数实现互为主备。
state BACKUP #两个都需要用BACKUP,用priority区别主辅
mcast_src_ip 10.10.81.100 #主/辅IP
advert_int 1 #主/辅check间隔时间
nopreempt 主机上用,如果切换后主机起来不再切换
vrrp_instance VI_1 {
state BACKUP #两个都需要用BACKUP,用priority区别主辅
interface eth0
virtual_router_id 51
priority 100 #优先级
mcast_src_ip 10.10.81.100 #主/辅IP
advert_int 1 #主/辅check间隔时间
nopreempt #主机上用,如果切换后主机起来不再切换
authentication {
auth_type PASS
auth_pass 55555
}
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