lvs+keepalive 集群安装部署文档
1安装和配置
1.1 安装LVS
lvs依赖openssl-devel和popt-devel，所以要先安装这个两个资源包：
# yum -y install openssl-devel popt-devel
安装完后，在安装lvs，我们这样采用云安装：
# yum -y install ipvsadm
1.2 安装keepalived
keepalived的下载地址：http://www.keepalived.org/download.html
在192.168.0.205（MASTER）上安装配置如下：
# tar zxvf keepalived-1.2.7.tar.gz
# cd keepalived-1.2.7
# ./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/keepalived.conf /etc/keepalived/
# cp /usr/local/sbin/keepalived /usr/sbin/
1.3 配置keepalived开机启动
# chkconfig keepalived on
1.4 配置keepalived
# vi /etc/keepalived/keepalived.conf
配置Keepalived，#vim /etc/keepalived/keepalived.conf，内容如下：
! Configuration File for keepalived
global_defs {
notification_email {
admin@xyxy.tk #接收Real Server 失效通知信息
}
notification_email_from lvs@xyxy.tk
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL_1 #Backup服务器将此项改为LVS_DEVEL_2
}
vrrp_instance VI_1 {
state MASTER#Backup服务器将此项改为BACKUP
interface eth0
virtual_router_id 51
priority 150#Backup服务器将此项改为100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.0.139#VIP，可以是多个，每个ip占一行
}
}
virtual_server 192.168.0.139 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 0#(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 192.168.0.207 80 {#Real Server 1
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 192.168.0.208 80 {#Real Server 2
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
virtual_server 192.168.0.139 3005 {
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 0#(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 192.168.0.150 3005 {#Real Server 1
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 3005
}
}
real_server 192.168.0.151 3005 {#Real Server 2
weight 100
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 3005
}
}
}
192.168.0.206（BACKUP）的配置和MASTER类似，只是会变更其中某个参数，这个已经在上面的配置文件中标出，这里不再赘述。
1.5 启动keepalived
# service keepalived start
1.6 其他配置
在192.168.0.207、192.168.0.208、192.168.0.150和192.168.0.151上面分别执行如下配置：
保存一个文件，取名随意，这里以dr.sh为例，内容如下：
#!/bin/sh
VIP=192.168.0.139#Virtual Server IP
/etc/rc.d/init.d/functions
case "$1" in
start)
echo "Start LVS of RS"
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up#注意子网掩码
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 -arp
/sbin/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
;;
stop)
/sbin/ifconfig lo:0 down
echo "Close LVS of RS"
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
sysctl -p
;;
*)
echo "Usage:$0{start|stop}"
exit 1
esac
给文件配置可执行权限，并执行即可。
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