CentOS 6.3下部署LVS(NAT)+keepalived實現高性能高可用負載均衡

本文轉載自查看原文 2012-08-27 13:49 35398 NAT/ keepalived/ Linux Server/ 負載均衡/ LVS/ 高性能高可用

一、簡介

VS/NAT原理圖：

二、系統環境

實驗拓撲：

系統平台：CentOS 6.3

Kernel：2.6.32-279.el6.i686

LVS版本：ipvsadm-1.26

keepalived版本：keepalived-1.2.4

三、安裝

0、安裝LVS前系統需要安裝popt-static，kernel-devel，make，gcc，openssl-devel，lftp，libnl*，popt*

1、在兩台Director Server上分別配置LVS+Keepalived

LVS install -------------

[root@CentOS-LVS_MASTER ~]# wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz

[root@CentOS-LVS_MASTER ~]# ln -s /usr/src/kernels/2.6.32-279.el6.i686//usr/src/linux/

[root@CentOS-LVS_MASTER ~]# tar zxvf ipvsadm-1.26.tar.gz

[root@CentOS-LVS_MASTER ~]# cd ipvsadm-1.26

[root@CentOS-LVS_MASTER ipvsadm-1.26]# make && make install

Keepalived install -------------

[root@CentOS-LVS_MASTER ~]# wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz

[root@CentOS-LVS_MASTER ~]# tar zxvf keepalived-1.2.4.tar.gz

[root@CentOS-LVS_MASTER ~]# cd keepalived-1.2.4

[root@CentOS-LVS_MASTER keepalived-1.2.4]# ./configure && make && make install

######### 將keepalived做成啟動服務，方便管理##########

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

[root@CentOS-LVS_MASTER ~]# mkdir /etc/keepalived/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/sbin/keepalived /usr/sbin/

[root@CentOS-LVS_MASTER ~]# service keepalived start | stop

2、開啟路由轉發

[root@CentOS-LVS_MASTER ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[root@CentOS-LVS_MASTER ~]# sysctl -p

3、配置Keepalived

[root@CentOS-LVS_MASTER ~]# less /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   router_id LVS_MASTER            #BACKUP上修改為LVS_BACKUP
}

vrrp_instance VI_1 {
    state MASTER                   #BACKUP上修改為BACKUP
    interface eth0
    virtual_router_id 51
    priority 100                   #BACKUP上修改為80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.0.0.227
    }
}

vrrp_instance LAN_GATEWAY {
    state MASTER                   #BACKUP上修改為LVS_BACKUP
    interface eth1
    virtual_router_id 52
    priority 100                   #BACKUP上修改為80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.10.10
    }
}

virtual_server 10.0.0.227 80 {
    delay_loop 6
    lb_algo rr
    lb_kind NAT
#   persistence_timeout 5
    protocol TCP

    real_server 192.168.10.4 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    
    real_server 192.168.10.5 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}

BACKUP服務器同上配置，先安裝lvs再安裝keepalived，然后配置/etc/keepalived/keepalived.conf，只需將批注部分改一下即可。

4、分別在2台Real Server上面設置網關

把網關都設置成：192.168.10.10

5、在2台RealServer中分別配置HTTP

[root@WEB1 ~]# yum -y install httpd
[root@WEB1 ~]# cd /var/www/html/
[root@WEB1 html]# cat index.html
<h1>WEB1/192.168.10.4</h1>
[root@WEB1 html]# /etc/init.d/httpd start
另一台機器配置一樣，過程略。

6、分別在CentOS-LVS_MASTER、CentOS-LVS_BACKUP上執行service keepalived start啟動keepalived就可實現負載均衡及高可用集群了；

[root@CentOS-LVS_MASTER keepalived]# service keepalived start