lvs + keepalived + httpd 高可用集群

kjhn

实验信息和拓扑：
备注：Centos 6.5 selinux –disabled iptables off

ServerName	Ipaddress information
LVSMaster	172.16.100.10/24
LVSBackup	172.16.100.11/24
VIP	172.16100.200/24
RealServer1	172.16.100.100/24
RealServer2	172.16.100.101/24

• 配置lvs Master & lvs Backup
  
  

# yum install popt popt-devel popt-static libnl-devel libnl–y

# mkdir -p mkdir /usr/local/src/lvs

# cd /usr/local/src/lvs/

安装ipvsadm

# wget http://www.linuxvirtualserver.or ... ipvsadm-1.26.tar.gz

# tar zxvf ipvsadm-1.26.tar.gz

# make && make install && echo"install LVS ok"

安装keepalived

# wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gz

# tar zxvf keepalived-1.2.13.tar.gz

# cd keepalived-1.2.13

# ./configure && make && make install && echo "installkeepalived ok" || echo "install keepalived is failed"

配置keepalived为启动脚本：

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

# cp /usr/local/etc/sysconfig/keepalived  /etc/sysconfig/

# mkdir /etc/keepalived

# cp /usr/local/etc/keepalived/keepalived.conf  /etc/keepalived/

# cp /usr/local/sbin/keepalived  /usr/sbin/

LVS Backup 配置同上

Master keepalived.conf配置文件：

!Configuration File for keepalived  
global_defs{  
   notification_email {  
         mengtao10@163.com  
   }  
   notification_email_from mengtao10@163.com
   smtp_server 127.0.0.1  
   router_id LVS_DEVEL  
}  
vrrp_instanceVI_1 {  
    state MASTER               
    interface eth0  
    virtual_router_id 51  
    priority 100      
    advert_int 1  
    authentication {  
        auth_type PASS  
        auth_pass 1q2w3e4r5t6y  
    }  
    virtual_ipaddress {  
        172.16.100.200   
    }  
}  
virtual_server172.16.100.200 80 {  
    delay_loop 6                    
    lb_algo wrr                    
    lb_kind DR                    
    persistence_timeout 60         
    protocol TCP                  
    real_server 172.16.100.100 80 {  
        weight 3                 
        TCP_CHECK {  
        connect_timeout 10         
        nb_get_retry 3  
        delay_before_retry 3  
        connect_port 80  
        }
    }  
    real_server 172.16.100.101 80 {  
        weight 3  
        TCP_CHECK {  
        connect_timeout 10  
        nb_get_retry 3  
        delay_before_retry 3  
        connect_port 80  
        }
     }  

}

Lvs Backup配置文件：

! Configuration File for keepalived  
global_defs{  
   notification_email {  
         mengtao10@163.com  
   }  
   notification_email_from mengtao10@163.com
   smtp_server 127.0.0.1  
   router_id LVS_DEVEL  
}  
vrrp_instanceVI_1 {  
    state BACKUP               
    interface eth0  
    virtual_router_id 51  
    priority 99      
    advert_int 1  
    authentication {  
        auth_type PASS  
        auth_pass 1q2w3e4r5t6y  
    }  
    virtual_ipaddress {  
        172.16.100.200   
    }  
}  
virtual_server172.16.100.200 80 {  
    delay_loop 6                    
    lb_algo wrr                    
    lb_kind DR                    
    persistence_timeout 60         
    protocol TCP                  
    real_server 172.16.100.100 80 {  
        weight 3                 
        TCP_CHECK {  
        connect_timeout 10         
        nb_get_retry 3  
        delay_before_retry 3  
        connect_port 80  
        }
    }  
    real_server 172.16.100.101 80 {  
        weight 3  
        TCP_CHECK {  
        connect_timeout 10  
        nb_get_retry 3  
        delay_before_retry 3  
        connect_port 80  
        }
     }  

}

两台realserver配置脚本如下：

#!/bin/bash
#
# Script to start LVS DR real server.
# description: LVS DR real server
#
. /etc/rc.d/init.d/functions

VIP=172.16.100.200
host=`/bin/hostname`

case "$1" in
start)
     # Start LVS-DR real server on this machine.
      /sbin/ifconfig lo down
      /sbin/ifconfig lo up
      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

      /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
      /sbin/route add -host $VIP dev lo:0

;;
stop)

      # Stop LVS-DR real server loopback device(s).
      /sbin/ifconfig lo:0 down
      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

;;
status)

      # Status of LVS-DR real server.
      islothere=`/sbin/ifconfig lo:0 | grep $VIP`
      isrothere=`netstat -rn | grep "lo:0" | grep $VIP`
       if [ ! "$islothere" -o !"isrothere" ];then
          # Either the route or the lo:0 device
          # not found.
          echo "LVS-DR real server Stopped."
      else
          echo "LVS-DR real server Running."
      fi
;;
*)
          # Invalid entry.
          echo "$0: Usage: $0 {start|status|stop}"
          exit 1
;;
esac

# sh realserver.sh  start

• 访问验证：
  
  1.任意关闭一台web服务器，服务都可以正常访问
  2.任意关闭一台lvs，服务都可以正常访问