[Linux] 通过Rsync+Inotify实现本、异地远程数据实时同步

0x0 测试环境

总部生产服务器与分部备份服务器要求实现异地数据备份，环境如下

          **centos 6.5**
生产服务器目录: /home/zytest/files
备份服务器目录: /home/zytest/files
用户 / 密码: zytest / zytest

0x1 生产服务器环境搭建

0x1.1 安装gcc编译器和rsync

yum install gcc rsync -y

0x1.2 拷贝inotify到服务器并解压

cd /root 
tar xfvz inotify-tools-3.13.tar.gz

0x1.3 进入inotify 目录安装

   cd inotify-tools-3.13
   ./configure
   make
   make install                   
   
   /usr/local/bin/inotifywait   ##检查是否安装成功

0x2 备份服务器环境搭建

0x2.1 安装 xinetd 和 rsync

 yum install xinetd rsync -y

0x3 以下内容两台服务器同步操作

 useradd -u 600 zytest   
 passwd zytest              
 zytest
 su - zytest -c 'mkdir /home/zytest/files'   ##创建同步目录

0x4 备份服务器上配置rsyncd

0x4.1 编辑/etc/xinetd.d/rsync按照以下内容修改

disable	    = yes      ==> disable	= no
flags		    = IPv6     ==> flags		= IPv4
server_args = --daemon ==> server_args = --daemon --config=/etc/rsyncd.conf

0x4.2 编辑/etc/rsyncd.conf 并添加以下脚本信息

uid = root
gid = root
use chroot = no
max connections = 1000
strict mode = yes
port = 873
pid file = /var/run/rsyncd.pid  
lock file = /var/run/rsyncd.lock  
log file = /var/log/rsyncd.log
# following for user "zytest", change for other users
[zytest]
path  = /home/zytest
ignore errors
auth users =zytest
secrets file = /home/rsync-dst.ps
read only = no
list = false

Ps: rsyncd 配置文件在 xinetd上，所以备份服务器安装xinetd

0x4.3 把密码写入调用的密码文件并赋予权限

echo zytest:zytest >> /home/rsync-dst.ps
chmod 600 /home/rsync-dst.ps 

0x4.4 通过xinetd启动rsync

 /etc/rc.d/init.d/xinetd restart

0x5 主服务器上配置inosync脚本文件

0x5.1 ** ##编辑/root/inosync添加脚本代码**

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#!/bin/sh
#chkconfig: 3 78 10

#This file exist from compile
if [ ! -f /usr/local/bin/inotifywait ]
then
  echo "cannot start. file inotifywait NOT exist!"
  exit
fi

#This file is runnable shell script
if [ ! -f /usr/local/bin/inosync.so.1 ]
then
  echo "contact administrator. inosync.so.1 NOT exist!"
  exit
fi

case "$1" in
  'start')
  /usr/local/bin/inosync.so.1 &
;;

'stop')
  pid=`ps -ef | grep -v grep | grep "inotifywait" | awk '{print $2}'`
  kill -9 $pid 2>&1
;;

'restart')
  $0 stop
  $0 start
;;

esac

0x5.2 赋予脚本权限，设置开机启动

  chmod a+x /root/inosync
  cp /root/inosync /etc/rc.d/init.d

0x5.3 配置调用的主脚本文件 /root/inosync.so.1

rhost=**备份服务器IP**
user=zytest
src=/home/zytest/files
dst=zytest
#dst corresponding to [zytest] in file /etc/rsyncd.conf on dst server
log=/root/inosync.log
/usr/local/bin/inotifywait -mrq --timefmt '%d/%m/%y %H:%M:%S' --format '%T %w%f %e' -e close_write,create,move,delete,attrib $src | while read files
  do
    echo == rsync begin == >> $log
    rsync -avP --password-file=/home/rsync-src.ps --delete $src $user@$rhost::$dst >> $log 2>&1
    echo -- rsyncd -- >> $log
    date >> $log
    echo "${files} was rsynced " >> $log 2>&1
  done

PS: %T后面有空格 %f和%e之间也有空格

0x5.4 赋予inosync.so.1脚本权限，拷贝到/usr/local/bin

chmod a+x /root/inosync.so.1
cp /root/inosync.so.1 /usr/local/bin

0x5.5 把密码写入调用的密码文件并赋予权限

 echo zytest >> /home/rsync-src.ps
 chmod 600 /home/rsync-src.ps

0x6 目标服务器设置inosync自动启动并开启inosync服务

chkconfig --level 3 inosync on
/etc/rc.d/init.d/inosync start

0x7 测试 END

在生产服务器/home/zytest/files目录下创建文件和文件夹，查看备份存储是否也同步了文件和文件夹，同步即成功。

过程可通过日志查看

tail -f /root/inosync.log