CentOS6.6环境下布署LVS+keepalived

CentOS6.6 环境下布署LVS+keepalived

环境：

操作系统 Centos 6.6 _X64

WEB nginx

结构:

         LVS-MASTER：10.6.1.210
         LVS-BACKUP: 10.6.1.211
         LVS-VIP: 192.168.1.214
         Realsever: 10.6.1.212,10.6.1.213

一．Keepalived主备服务器配置

配置服务器时间同步（所有服务器都需要配置）。

yum install -y ntp
ntpdate time.nist.gov

crontab –e
00 01 * * * /usr/sbin/ntpdate time.nist.gov>/dev/null 2>&1

安装LVS和Keepalived (主备机上都需要安装)

Yum install Ipvsadm keepalived –y

修改keepalived配置文件。

rpm -ql keepalived 查看配置文件所有目录

[[email protected] ~]# vi/etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
      [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
# smtp_connect_timeout 30
   router_id LVS_DEVEL
}

# VIP1
vrrp_instance VI_1 {
    stateMASTER                  #备份服务器上将MASTER改为BACKUP
    interface eth0
    virtual_router_id 51
    priority 100               # 备份服务上将100改为90
    advert_int 5
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.6.1.214
        #(如果有多个VIP，继续换行填写.)
    }
}

virtual_server 10.6.1.214 80 {
    delay_loop6                 #(每隔10秒查询realserver状态)
    lb_algowlc                 #(lvs 算法)
    lb_kindDR                 #(Direct Route)
    persistence_timeout60        #(同一IP的连接60秒内被分配到同一台realserver)
    protocolTCP               #(用TCP协议检查realserver状态)

    real_server 10.6.1.212 80 {
        weight100              #(权重)
        TCP_CHECK {
        connect_timeout10       #(10秒无响应超时)
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
    real_server 192.168.9.213 80 {
        weight 100
        TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
     }
}

启动keepalived服务并加入自启动列表

[[email protected]~]# service keepalived start|stop
[[email protected] ~]# chkconfig keepalived on

复制配置文件到备机上面.

# scp keepalived.conf [email protected]:/etc/keepalived/

并做相应修改。主要有两个地方，上面已经用红色标出。

# VIP1
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 90

二．配置realserver，在realserver上安装nginx服务和配置nginx文件等，此处省略。

写执行脚本,本脚本主要作用是忽略ARP广播。(每台realserver上都要执行)

[[email protected]_1~]# vi /root/lvs_real.sh

**********************************************************

#!/bin/bash

SNS_VIP=192.168.1.214
. /etc/rc.d/init.d/functions

case "$1" in
start)
       /sbin/ifconfig lo:0 $SNS_VIP netmask255.255.255.255 broadcast $SNS_VIP
       /sbin/route add -host $SNS_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)
       /sbin/ifconfig lo:0 down
       /sbin/route del $SNS_VIP >/dev/null2>&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"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit 1
esac

exit 0