Linux AS 5上实战安装配置LVS

LVS的安装配置教程网上有不少,但是都是在Linux AS4或者更低版本下的。在AS 5上按照那些教程来安装发现有些问题,为了让大家以后少走弯路,以下奉上小弟的详细安装步骤(DR方式)。

假设以下环境

LB master 为 192.168.0.50

LB slave 为 192.168.0.51

Real server1 为192.168.40.20

Real server2 为192.168.40.21

外部虚拟IP为192.168.30.60,Real server群集的网关是192.168.40.254。

 

在安装LVS前,首先检查你的系统是否已经安装好以下包:

Kernel-devel

gcc

openssl

openssl-devel

popt

 

 

首先下载ipvadmin的安装文件,注意AS 5的对应安装文件应该是这个

http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz

接着运行以下命令:

 

# ln -s /usr/src/kernels/2.6.18-8.el5-i686/ /usr/src/linux

 

# tar zxvf ipvsadm-1.24.tar.gz

# cd ipvsadm-1.24

# make && make install

 

 

接着,我们下载keepalived并安装,http://www.keepalived.org/software/keepalived-1.1.15.tar.gz 

 

运行以下命令:

# tar zvfx keepalived-1.1.15.tar.gz

# cd keepalived-1.1.15

 

#./configure

会有以下信息:

 

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

 

如果Use IPVS Framework这项为“No”,请确认# ln -s /usr/src/kernels/2.6.18-8.el5-i686/ /usr/src/linux是否正确,可能你的安装跟我的路径有所不同。接着运行:

 # make && make install

 

安装完后,我们就可以对keepalived进行配置了

 

# vi /usr/local/etc/rc.d/init.d/keepalived

把第一行的#!/bin/sh改为

#!/usr/local/sbin/keepalived

 

修改. /etc/sysconfig/keepalived为

. /usr/local/etc/sysconfig/keepalived

 

运行以下命令连接开机脚本

# ln -s /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/rc3.d/S99keepalived

# ln -s /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/rc5.d/S99keepalived

 

接下来就是修改keepalived的配置文件使其符合你的环境。

修改keepalived.conf

# vi /etc/keepalived/keepalived.conf

 

vrrp_sync_group VG1 {
    group {
        VI_1
        VI_2
    }
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1234
    }
    virtual_ipaddress {
        192.168.30.60
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface eth1
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.40.254
    }
}

global_defs {
  router_id LB
}

virtual_server 192.168.30.60 80 {
  delay_loop 10 
  lb_algo wlc
  lb_kind DR
  persistence_timeout 2
  protocol TCP

  real_server 192.168.40.20 80 {
    weight 1
    TCP_CHECK {
      connect_port 80
      connect_timeout 3
    }

  }

  real_server 192.168.40.21 80 {
    weight 1
    TCP_CHECK {
      connect_port 80
      connect_timeout 3
    }
  }
}

最后把系统的sysctl.conf中的net.ipv4.ip_forward项设为1。 

备份LB哪台机的配置只需要把 state MASTER 改为 state BACKUP。

 

另外我们还要对Real server群进行VIP配置

在每台Real server上创建一个文件

/etc/sysconfig/network-scripts/ifcfg-lo:0 并加入

DEVICE=lo:0

ONBOOT=yes

BOOTPROTO=static

IPADDR=192.168.30.60

NETMASK=255.255.255.255

然后关闭ARP reply

# vi /etc/sysctl.conf加入

net.ipv4.conf.eth0.arp_ignore = 1

net.ipv4.conf.eth0.arp_announce = 2

net.ipv4.conf.all.arp_ignore = 1

net.ipv4.conf.all.arp_announce = 2

net.ipv4.conf.lo:0.arp_ignore=8

 

大功告成,reboot全部机器看看成果吧。

 

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