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  rsync + inotify to achieve real-time synchronization
  Add Date : 2018-11-21      
  Rsync + inotify to achieve real-time synchronization

1, install rsync

You can install rsync service via yum source
[Root @ dg test] # yum install rsync

You can also install the source package
 wget http://rsync.samba.org/ftp/rsync/src/rsync-3.0.9.tar.gz
[Root @ dg test] #tar zxvf rsync-3.0.9.tar.gz
[Root @ dg test] #cd rsync-3.0.9
[Root @ dg test] #. / Configure --prefix = / usr / local / rsync
[Root @ dg test] # make
[Root @ dg test] #make install

make -j 4 # make compile the source code is compiled into a binary executable file -j 4 compiled using four processes simultaneously, taking the number of cpu, do not exceed the number of cpu

For example: at the source has a directory under / tmp / test there next file syncs sink, but this method only manual synchronization, can not achieve real-time synchronization
[Root @ dg test] # rsync -azP --delete / tmp / test root@ / data

Note: rsync is based on the ssh protocol, we need to know the server root and password
-a, archive (Archive) archiving mode represents recursively transfer files, and to maintain stable properties, is equivalent to adding a parameter -riptgoD
-z --compress represents compression
-P Shows the transmission speed
--delete delete those target end position and have no original location of the file

Add ssh key service, the next you can not enter a password
[Root @ dg bin] # ssh-keygen
Generating public / private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
1e: 5f: 6e: fe: 15: a6: c1: 12: d7: 1d: 4c: 79: c5: 9f: a3: 9d root @ dg

A copy of the trust relationship to the target end

[Root @ dg .ssh] # ssh-copy-id root@


See key target segment has elapsed
[Root @ rac2 .ssh] # ls
authorized_keys known_hosts

Without entering a password, this way no password synchronization
[Root @ dg .ssh] # ssh root@
Last login: Wed Jan 20 10:42:22 2016 from
[Root @ rac2 ~] #

2 Installing inotify

[Root @ dg test] #tar zxvf inotify-tools-3.14.tar.gz
[Root @ dg test] # cd inotify-tools-3.14
[Root @ dg test] # ./configure --prefix = / usr / local / inotify
[Root @ dg test] # make
[Root @ dg test] # make install

inotifywait -mrq -e create, move, delete, modify / tmp / test
-e change attribute is used to specify which events you want to monitor these events include create, create, move move, delete delete, modify content attrib
-m indicates continuous monitoring
-r recursive monitoring indicates
-q represents a simplified output

Also open a window:
root @ dg test] # cp / etc / group / tmp / test
[Root @ dg ~] # inotifywait -mrq -e create, move, delete, modify / tmp / test
/ Tmp / test / CREATE group
/ Tmp / test / MODIFY group

From this it can be seen inotifywait can capture files created message

3 Create rsync replication script

This function is mainly to the server side of the / tmp directory in the content, if you modify (either to add, modify, delete files) can be monitored via inotify, and through rsync real-time synchronization to the client in the / tmp, the following is by shell script to achieve.

[Root @ dg test] # cat rsync.sh
#! / Bin / bash
host =
src = / data
des = / data2
user = root
/ Usr / local / inotify / bin / inotifywait -mrq --timefmt '% d /% m /% y% H:% M' --format '% T% w% f% e' -e modify, delete, create , attrib $ src | while read files
/ Usr / bin / rsync -vzrtopg --delete $ src $ user @ $ host: $ des
echo "$ {files} was rsynced" >> / rsync.log 2> & 1

Wherein the host is a client's ip, src is a server-side real-time monitoring to the directory, des is certified module name, needs to be consistent with the client, user is creating a password file authentication user.
This script named rsync.sh, put monitoring directory, for example, I would put / tmp below, and give 764 permissions, suggest that it rsync log into other directories (non-backup directory).
[Root @ dg test] # chmod 764 rsync.sh

Then run this script
[Root @ dg test] # sh /tmp/rsync.sh &

We can also put rsync.sh script to the boot entry in
echo "/tmp/rsync.sh" >> /etc/rc.local
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