集群架构图

具体实现

hostA : 192.168.1.21

hostB : 192.168.1.22

hostC : 192.168.1.23

虚拟ip地址： 192.168.1.20

hostA为负载均衡器

hostB和hostC为ftp服务器

转发模式：DR

调度算法：rr

hostA配置

安装ipvsadm:

yum install ipvsadm -y

开启ip转发功能：

vim /etc/sysctl.conf

net.ipv4.ip_forward = 1

sysctl -p

关闭防火墙：

/etc/init.d/iptables stop

配置ipvs(start.sh)：

#! /bin/sh

# DR Mode

ipvsadm -C
ipvsadm -A -t 192.168.1.20:21 -s rr -p
ipvsadm -a -t 192.168.1.20:21 -r 192.168.1.22:21 -g
ipvsadm -a -t 192.168.1.20:21 -r 192.168.1.23:21 -g
ipvsadm save
ipvsadm -ln
ifconfig eth0:0 192.168.1.20 netmask 255.255.255.0

hostB配置

配置虚拟ip

[root@hostB test]# cat /etc/init.d/realserver.sh
#!/bin/bash
SNS_VIP=192.168.1.20
. /etc/rc.d/init.d/functions
case "$1" in
start)
 ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 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)
 ifconfig lo:0 down
 route del $SNS_VIP >/dev/null 2>&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

[root@hostB test]# sh /etc/init.d/realserver.sh start
SIOCADDRT: File exists
RealServer Start OK

　安装ftp

yum install vsftpd -y

　修改配置：

    为了方便开启匿名用户操作ftp的各种权限。

chmod a+w /var/ftp/pub/ # 开启文件夹写权限

vim /etc/vsftpd/vsftpd.conf

anon_upload_enable=YES
anon_mkdir_write_enable=YES
anon_other_write_enable=YES # 开启匿名用户删除功能

配置selinux:

getsebool -a | grep ftp
setsebool -P allow_ftpd_anon_write 1
setsebool -P allow_ftpd_full_access 1

启动ftp：

/etc/init.d/vsftpd start

配置开机启动：

chkconfig vsftpd on

关闭防火墙：

/etc/init.d/iptables stop
chkconfig iptables off

hostC配置

配置同hostB

测试脚本

#! /usr/bin/env python
#-*- coding:utf-8 -*-

import ftplib,os,time

ftp = ftplib.FTP("192.168.1.20")
ftp.login()
ftp.cwd("/pub")

i = 0
while True :
    filename = "ftptest1_%d.txt" % i
    print filename
    i += 1
    with open(filename,"w") as fout :
        fout.write(str(time.time()))
    myfile = open(filename, 'r')
    try :
        ftp.storlines('STOR ' + filename, myfile)
    except :
        ftp.login()
        ftp.cwd("/pub")
    myfile.close()
    os.remove(filename)
    time.sleep(10)

关闭防火墙：