Centos5.6构建LVS+keepalived
系统环境：centos64位系统
lvs-master：10.20.189.240
lvs-backup：10.20.189.241
vip：10.20.189.239
web1：10.20.189.242
web2：10.20.189.243
首先在lvs-master：10.20.189.240
# cd /usr/local/src
# wgethttp://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
# wgethttp://www.keepalived.org/software/keepalived-1.2.7.tar.gz
# tar -zxvf ipvsadm-1.24.tar.gz
# cd ipvsadm-1.24
# ln -s /usr/src/kernels/2.6.18-238.el5-x86_64/ /usr/src/linux
（32位系统用：ln -s /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux）
不加这个软连接的话，在执行make的时候会出现类似如下的错误编译信息：
libipvs.h:14:23: error: net/ip_vs.h: No such file or directory
查找下此文件 find / -name ip_vs.h 发现64位系统在这个目录下/usr/src/kernels/2.6.18-238.el5-x86_64，所以就有了前面的软连接
/usr/src/kernels/2.6.18-238.el5-x86_64/include/net/ip_vs.h
# make && make install
# cd ..
# tar -zxvf keepalived-1.2.7.tar.gz
# cd keepalived-1.2.7
# ./configure --sysconf=/etc（指定配置文件的安装路径）
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files.
解决：
# yum -y install openssl-devel
版本1.2.7的编译信息如下：
------------------------
Keepalived version : 1.2.7
Compiler : gcc
Compiler flags : -g -O2 -DETHERTYPE_IPV6=0x86dd
Extra Lib : -lpopt -lssl -lcrypto
Use IPVS Framework : Yes
IPVS sync daemon support : Yes
IPVS use libnl : No
Use VRRP Framework : Yes
Use VRRP VMAC : No
SNMP support : No
Use Debug flags : No
版本1.1.17的编译信息如下：
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
# make
# make install
# ln -s /usr/local/sbin/keepalived /sbin/
# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
zhangrenfang8738@163.com
}
notification_email_from zhangrenfang8738@163.com
smtp_server smtp.163.com
# smtp_connect_timeout 30
router_id LVS_DEVEL
}
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 # 备份服务器上将100改为90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.20.189.239
}
}
virtual_server 10.20.189.239 80 {
delay_loop 6 #(每隔10秒查询realserver状态)
lb_algo rr #(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 10.20.189.242 80 {
weight 3 #(权重)
TCP_CHECK {
connect_timeout 5 #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
}
}
real_server 10.20.189.243 80 {
weight 3
TCP_CHECK {
connect_timeout 5
nb_get_retry 3
delay_before_retry 3
}
}
}
#service keepalived start
# chkconfig --level 2345 keepalived on
lvs-backup对照lvs-master安装相应软件，注意keepalive.conf有细微区别
配置realserver10.20.189.242
# yum install httpd -y
# /etc/init.d/httpd start
# vi /root/lvs_real.sh
#!/bin/bash
SNS_VIP=10.20.189.239
/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
# chmod +x /root/lvs_real.sh
# /root/lvs_real.sh start
# ifconfig
eth0 Link encap:EthernetHWaddr 00:0C:29:82:A5:C2
inet addr:10.20.189.242Bcast:10.20.189.255Mask:255.255.254.0
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:25257 errors:0 dropped:0 overruns:0 frame:0
TX packets:7730 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12159312 (11.5 MiB)TX bytes:502344 (490.5 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
UP LOOPBACK RUNNINGMTU:16436Metric:1
RX packets:13 errors:0 dropped:0 overruns:0 frame:0
TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1120 (1.0 KiB)TX bytes:1120 (1.0 KiB)
lo:0 Link encap:Local Loopback
inet addr:10.20.189.239Mask:255.255.255.255
UP LOOPBACK RUNNINGMTU:16436Metric:1
# echo "/root/lvs_real.sh start" >> /etc/rc.local
#LVS_master、LVS_backup上开启keepalived，LVS_master先绑定VIP
LVS_master：
# ip add
1: lo: mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:64:7b:9f brd ff:ff:ff:ff:ff:ff
inet 10.20.189.240/23 brd 10.20.189.255 scope global eth0
inet 10.20.189.239/32 scope global eth0
LVS_backup：
# ip add
1: lo:mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0:mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:92:2d:e8 brd ff:ff:ff:ff:ff:ff
inet 10.20.189.241/23 brd 10.20.189.255 scope global eth0
#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
/etc/init.d/keepalived stop
LVS_backup接替LVS_master绑定VIP
# ip add
1: lo:mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0:mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:0c:29:92:2d:e8 brd ff:ff:ff:ff:ff:ff
inet 10.20.189.241/23 brd 10.20.189.255 scope global eth0
inet 10.20.189.239/32 scope global eth0
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realserver10.20.189.242 /etc/init.d/httpd stop
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
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