CentOS6.6环境下布署LVS+keepalived

43524 · 发表于 2015-9-30 08:55:54

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

[iyunv@master ~]# vi/etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
notification_email {
   test@163.com
}
notification_email_from test@163.com
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
[iyunv@master~]# service keepalived start|stop
[iyunv@master ~]# chkconfig keepalived on

复制配置文件到备机上面.

# scp keepalived.conf root@10.6.1.211:/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)

[iyunv@web_1~]# vi /root/lvs_real.sh

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

#!/bin/bash
SNS_VIP=192.168.9.200
. /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
*********************************************************************
赋权并执行
# chmod +x /roo/lvs_real.sh
# ./root/lvs_real.sh start
echo “/root/lvs_real.sh start” >> /etc/rc.local

本人觉得两种方法都可以实现。

三．测试部分。

1．主备启动keepalived服务。

LVS-MASTER