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lvs+keepalived实现高可用负载均衡_lvs lb_kind

lvs lb_kind
昨天在chinaunix的论坛上看到一哥们的提问:为什么他ipvsadm -L看不到后端的realsrver,我想应该是他的realserver上没有启动脚本吧!也或许是他realserver上的80端口没有开启,这里我也写下我的环境的lvs+keepalived架构的实现!目的就是用虚拟IP转发80端口和1099端口请求到后端的真实服务器。
四台机器环境:
IP地址            lvs版本      keepalived版本     系统版本            用途
192.168.15.67      1.2.4        1.1.15            redhat4.8(64位)     MASTER
192.168.15.91      1.2.4        1.1.15            redhat4.8(64位)     BACKUP
192.168.15.93      无需安装     无需安装          redhat4.8(64位)     Realserver
192.168.15.94      无需安装     无需安装          redhat4.8(64位)     Realserver
192.168.15.120                                                        VIP
拓扑图:

1、lvs软件ipvsadm下载安装(主机和备机上面都必须安装)

wget 

tar zxvf ipvsadm-1.24.tar.gz

ln -s /usr/src/kernels/2.6.9-89.EL-smp-x86_64 /usr/src/linux //注释:这一步针对自己的系统做,否则一会安装ipvsadm会报错。

cd ipvsadm-1.24

make

make install

2、keepalived下载安装(主机和备机上面都必须安装)

wget 

tar zxvf keepalived-1.1.15.tar.gz

cd keepalived-1.1.15

//注释:如果系统rhel版本低于5.0以下安装报错,这里要修改系统配置

//vi /usr/src/linux/include/linux/types.h 将下面2行红色字体用/* */注释掉,如下图

/*

typedef __u16 __bitwise __sum16;

typedef __u32 __bitwise __wsum;

*/

./configure

make

make install

3、将keepalived做成服务启动(主机和备机上面都必须安装)

cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/            注释:拷贝服务启动文件

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

mkdir /etc/keepalived/                                   注释:创建配置文件目录

cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/   注释:拷贝配置文件

cp /usr/local/sbin/keepalived /usr/sbin/                     注释:拷贝可执行文件

service keepalived start                                  注释:测试服务启动与关闭

service keepalived stop

4、主机上配置keeplived(配置前备份好keepalived.conf文件然后再清空即可)

cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

echo “” > /etc/keepalived/keepalived.conf

增加如下内容:

! Configuration File for keepalived

global_defs {

   notification_email {

       zengzhunzhun@ninetowns.com

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 127.0.0.1

   router_id LVS_DEVEL

}

vrrp_instance VI_1 {

   state MASTER                             状态是MASTER

   interface eth0                             监听网卡切换

   virtual_router_id 51

   priority 100                               优先级100

   advert_int 1

   authentication {

       auth_type PASS

       auth_pass 1111

   }

virtual_ipaddress {

      192.168.15.120                          虚拟IP地址,即VIP

   }

}

virtual_server 192.168.15.120 80{

   delay_loop 6

   lb_algo wlc

   lb_kind DR                                       DR模式

   persistence_timeout 1

   protocol TCP

   real_server 192.168.15.94 80{

       weight 1                                     权重,权重越高处理的请求越多

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 80

       }

   }

   real_server 192.168.15.93 80{

       weight 1

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 80

       }

   }

}

virtual_server 192.168.15.120 1099{

   delay_loop 6

   lb_algo wlc

   lb_kind DR

   persistence_timeout 1

   protocol TCP

   real_server 192.168.15.94 1099{

       weight 1

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 1099

       }

   }

   real_server 192.168.15.93 1099{

       weight 1

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 1099

       }

   }

}

5、备机上配置keeplived(配置前备份好keepalived.conf文件然后再清空即可)

cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak

echo “” > /etc/keepalived/keepalived.conf

增加如下内容:(只有两处和主机上的不一样,下面已用红色字体标出)

! Configuration File for keepalived

global_defs {

   notification_email {

       zengzhunzhun@ninetowns.com

   }

   notification_email_from Alexandre.Cassen@firewall.loc

   smtp_server 127.0.0.1

   router_id LVS_DEVEL

}

vrrp_instance VI_1 {

   state BACKUP                                     注意状态是BACKUP

   interface eth0

   virtual_router_id 51

   priority 99                                       优先级是99,比主机低

   advert_int 1

   authentication {

       auth_type PASS

       auth_pass 1111

   }

virtual_ipaddress {

      192.168.15.120

   }

}

virtual_server 192.168.15.120 80{

   delay_loop 6

   lb_algo wlc

   lb_kind DR

   persistence_timeout 1

   protocol TCP

   real_server 192.168.15.94 80{

       weight 1

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 80

       }

   }

   real_server 192.168.15.93 80{

       weight 1

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 80

       }

   }

}

virtual_server 192.168.15.120 1099{

   delay_loop 6

   lb_algo wlc

   lb_kind DR

   persistence_timeout 1

   protocol TCP

   real_server 192.168.15.94 1099{

       weight 1

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 1099

       }

   }

   real_server 192.168.15.93 1099{

       weight 1

       TCP_CHECK {

       connect_timeout 1

       nb_get_retry 3

       delay_before_retry 3

       connect_port 1099

       }

   }

}

6、两台realserver上启动脚本,脚本内容如下:

#!/bin/bash
VIP=192.168.15.120
. /etc/rc.d/init.d/functions
case "$1" in
start)
        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
        ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
        /sbin/route add -host $VIP dev lo:0 
        sysctl -p > /dev/null 2>&1
        echo "realserver start OK"
        ;;
stop)
        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
        ifconfig lo:0 down
        /sbin/route del $VIP > /dev/null 2>&1         
        echo "realserver stoped"
        ;;
*)
        echo "Usage:$0 {start|stop}"
        exit 1
esac
exit 0
7、测试工作:

1)启动主机和备机的keepalived服务,ip a确认是否有vip地址?

2)输入ipvsadm -Ln查看是否有如下内容输出?

ipvsadm -Ln
IP Virtual Server version 1.2.0 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.15.120:80 wlc persistent 1
  -> 192.168.15.94:80             Route   1      122        4        
  -> 192.168.15.93:80             Route   1      124        6        
TCP  192.168.15.120:1099 wlc persistent 1
  -> 192.168.15.94:1099           Route   1      0          0        
  -> 192.168.15.93:1099           Route   1      0          0    

3)停止主机的keepalived服务,备机上确认是否接管vip地址?

4)备机上输入ipvsadm -Ln查看ActiveConn和InActConn对应的值不为0?主机上反而为0了。

5)启动主机的keepalived服务,确认主机再次接管vip地址继续服务?

 

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