LVS_DR+Keepalived 实践

一.实践环境
三台服务器，一台做lvs+keepalived，两台是lvs_web,因为只有三台机器环境测试所以lvs+keepalived没有做heartbeat来做备份
LVS+keepalived -----------------192.168.2.17
Lvs_web01------------------------192.168.2.165
Lvs_web02------------------------192.168.2.166
Web_vip---------------------------192.168.2.190
 二．安装步骤
1．  安装ipvsadm
ipvsadm下载地址
[root@lvs-dr1 ~]# tar zxvf ipvsadm-1.24.tar.gz  # 解压缩ipvsadm包 #
[root@lvs-dr1 ~]# ln -s /usr/src/kernels/2.6.18-53.el5-i686 /usr/src/linux # 做一个目录的链接 #
[root@lvs-dr1 ~]# ls -l /usr/src/  # 查看ln过的链接状态#
[root@lvs-dr1 ~]# cd ipvsadm-1.24
[root@lvs-dr1 ipvsadm-1.24]make && make install  # 编译并安装 #
root@lvs-dr1 ipvsadm-1.24]# find / -name ipvsadm  # 查看ipvsadm的位置 #
2.安装keepalived
keepalived下载地址
[root@lvs-dr1 ~]# tar zxvf keepalived-1.1.15.tar.gz  # 解压缩keepalived包 #
[root@lvs-dr1 ~]# cd keepalived-1.1.15
[root@lvs-dr1 keepalived-1.1.15]# ./configure
# 最好按照默认配置参数不要指定prefix，可能会出现问题 #
[root@lvs-dr1 keepalived-1.1.15]# make && make install  # 编译并安装 #
[root@lvs-dr1 keepalived-1.1.15]# find / -name keepalived  # 查看keepalived位置 #
3. 配置keepalived:
[root@lvs-dr1 keepalived]# pwd
/usr/local/etc/keepalived  # keepalived配置文件的路径 #
[root@lvs-dr1 keepalived]# ll keepalived.conf
-rw-r--r-- 1 root root 1627 Aug 16 09:13 keepalived.conf  # keepalived配置文件名 #
[root@lvs-dr1 keepalived]# more keepalived.conf
! Configuration File for keepalived
 global_defs {
  # notification_email {
  #   [e-mail]
  #   [e-mail]
  #   [e-mail]
  # }
  # notification_email_from [e-mail]
  # smtp_server 192.168.200.1
  # smtp_connect_timeout 30
   router_id LVS_DEVEL
}
# 2008-08-19 by hjw
# VIP1
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 200
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.2.190
#        192.168.1.220
    }
}
virtual_server 192.168.2.190 80 {
    delay_loop 6
    lb_algo wlc
    lb_kind DR
    persistence_timeout 50
    protocol TCP
    real_server 192.168.2.165 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
    real_server 192.168.2.166 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
}
 
# shell end
 
4.启动keepalived：
 /usr/local/sbin/keepalived -D -f /usr/local/etc/keepalived/keepalived.conf
在/etc/rc.local中添加，脚本开机启动:
Vi /etc/rc.d/rc.local
添加：
/usr/local/sbin/keepalived -D -f /usr/local/etc/keepalived/keepalived.conf
 
3.配置LVS_DR的模式
LVS端的配置
（1）写脚本ipvsadm.sh如下：
#!/bin/bash
ipvsadm -C
#VS/DR
ipvsadm -A -t 192.168.2.190:80 -s wlc
ipvsadm -a -t  192.168.2.190:80 -r 192.168.2.165:80 -g
ipvsadm -a -t  192.168.2.190:80 -r 192.168.2.166:80 -g
ipvsadm –Ln
（2）在eth0上绑定ifcfg-eth0:0的IP为192.168.2.190
Ifcfg-eth0:0的配置文件为：
DEVICE=eth0:0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.2.190
NETMASK=255.255.255.0
#GATEWAY=192.168.2.254
#HWADDR=00:E0:4C:E9:33:7B
两台LVS_Web端的配置：
1）         Vi  /etc/sysctl.conf
#for ipvs
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.rp_filter = 1
#end of ipvs
2）         配置ifcfg-lo:0的IP为192.168.2.190
Vi  /etc/ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.2.190
NETMASK=255.255.255.255
ONBOOT=yes
3）         配置两台LVS_web的apache服务，至此结束
三．  测试服务
1．   启动两台lvs_web的apache服务
2．   启动lvs_keepalived服务器的keepalived和lvs的服务
3．   访问并不断刷新页面开是否平均落到两台服务器上
4．   停到一台lvs_web的apache服务，在访问