LVS集群配置实践-优快云博客

本文记录了使用四台CentOS 5.2机器搭建LVS集群的步骤，涉及服务配置、安全设置及TCP连接管理。

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1.选用四台Linux机器做测试，全部都是同一版本的CentOS 5.2，为了简单其见关闭SELinux和防火墙功能：

1)vi /etc/sysconfig/selinux ，设置SELINUX=disabled

2)service iptables stop

2.安装CentOS时不要选择安装Xen或集群，会有问题

3.虚拟主机，一台Master，一台Backup，二台Real Server,IP地址分别是：

Virtual IP：192.168.10.120

Master：192.168.10.118

Backup：192.168.10.118

Real Server1：192.168.10.117

Real Server2：192.168.10.116

4.如果要做外部测试，请在路由器上设置路由，比如对外端口是8001，映射地址是Virtual IP，而不是Master或者Backup的地址

5.Master和Backup都安装文章二的步骤安装ipvsadm和keepalived软件

6.在Master主机上vi /etc/keepalived/keepalived.conf，添加如下内容：

! Configuration File for keepalived
global_defs {
   notification_email {
     test@gmail.com
   }
   notification_email_from lvsd@126.com
   smtp_server smtp.126.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state MASTER #如果在backup上面，改成BACKUP
    interface eth0
    virtual_router_id 51
    priority 100 #如果在backup上面，改成99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.10.120
        #192.168.10.121
    }
}
virtual_server 192.168.10.120 8001 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 50
    protocol TCP
    real_server 192.168.10.117 8001 {
        weight 3
        TCP_CHECK{
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
        }
    }
    real_server 192.168.10.116 8001 {
        weight 1
        TCP_CHECK{
            connect_timeout 10
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

7.在Master主机上vi /etc/rc.d/init.d/lvsd创建LVS Daemon程序，内容如下：

#!/bin/bash
# /etc/rc.d/init.d/lvsd
#
# chkconfig 345 95 5
# description:start or stop lvs daemon service
 
VIP=192.168.10.120
RIP1=192.168.10.117
RIP2=192.168.10.116
. /etc/rc.d/init.d/functions
logger $0 called with $1
 
prog="lvsd"
start(){
     #start ipvsadm
     /sbin/ipvsadm --set 30 5 60
     /sbin/ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.255 broadcast $VIP up
     /sbin/route add -host $VIP dev eth0:0
     /sbin/ipvsadm -A -t $VIP:8001 -s wrr -p 3
     /sbin/ipvsadm -a -t $VIP:8001 -r $RIP1:80 -g -w 1
     /sbin/ipvsadm -a -t $VIP:8001 -r $RIP2:80 -g -w 1
     touch /var/lock/subsys/ipvsdam > /dev/null 2>&1
     echo "ipvsadm start OK"
 
     #start keepalived
     service keepalived start
     echo "start $prog OK"
}
stop(){
     #stop keepalived first
     service keepalived stop
 
     #stop ipvsadm second
     /sbin/ipvsadm -C
     /sbin/ipvsadm -Z
     ifconfig eth0:0 down
     route del $VIP
     rm -rf /var/lock/subsys/ipvsadm > /dev/null 2>&1
     echo "ipvsadm stoped"
     echo "$prog stoped"
}
status(){
     if [ ! -e /var/lock/subsys/ipvsadm ]; then
        echo "ipvsadm stoped"
        exit 1
     else
        echo "ipvsadm OK"
     fi
 
     service keepalived status
}
case "$1" in
   start)
     start
     ;;
   stop)
     stop
     ;;
   restart)
     stop
     start
     ;;
   status)
     status
     ;;
   *)
    echo "Usage  : service $prog {start|stop|restart|status}"
    exit 1
esac
exit 0

8.把lvsd添加到服务当中：

1）chkconfig --add lvsd

2）chkconfig --level 35 lvsd on，设置开机启动

3）chkconfig --list lvsd ，查看lvsd服务

9.backup主机按上面进行同样的配置

10.在Real Server1上面执行vi /etc/rc.d/init.d/realserverd：

#!/bin/bash
#
# chkconfig 345 95 5
# description : lvs real server daemon

VIP=192.168.10.120
. /etc/rc.d/init.d/functions
 
start(){
     ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
     /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 >/dev/null 2>&1
     echo "RealServer Start OK"
}
stop(){
     ifconfig lo:0 down
     route del $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"
}
case "$1" in
  start)
     start
     ;;
   stop)
     stop
     ;;
   restart)
     stop
     start
   status)
    
   *)
     echo "Usage:$0{start|stop|restart|status}"
     exit 1
esac
exit 0

11.把realserverd添加到服务当中：

1）chkconfig --add realserverd

2）chkconfig --level 35 realserverdon，设置开机启动

3）chkconfig --list realserverd，查看realserverd服务
12.vi /etc/httpd/conf/httpd.conf，把侦听商品改成8001
13.vi /var/www/html/index.html，添加如下内容：

14.启动Apache服务器：service httpd start
15.启动realserverd服务：service realserverd start
16.Real Server2也按上述进行配置
14.启动lvsd服务：service lvsd start
15.在浏览器中输入http://192.168.10.120进行检测，并刷新网页看是否自动显示117或116不同ip的网页
16.关闭Master上面的lvsd服务：service lvsd stop，查看Backup是否能自动切换

LVS学习笔记（三）