Real-time synchronization in Linux under Rsync+inotify

Rsync is the data under Unix-like systems Mirror Backup tool--remote Sync,inotify is a Linux feature that monitors file system operations such as read, write, and create. The combination of the two enables real-time synchronization of files between the server and the client.

Experimental logic diagram

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I. Install and configure RSYNC service

Master, standby server check if Rsync service is installed, typically the system is installed by default

[Email protected] bin]# Rpm-qa rsync

Rsync-3.0.6-6.el5_11

1, first to configure the Rsync-slave

Add the configuration of rsync files, configuration content for/data/directory for backup, virtual user syncuser, password file/etc/rsyncd.pass

Vim/etc/rsyncd.conf

# section 1:global Settings

Port = 873

UID = root

GID = root

Use chroot = no

Read Only = no

Max connections = 7

PID file =/var/run/rsyncd.pid

Log file =/var/log/rsyncd.log

Hosts allow = *

Transfer logging = yes

Log format =%t%a%m%f%b

Syslog facility = Local3

Timeout = 300

# section 2:directory to be synced

[Data]

Path =/data/

List = False

Ignore errors = yes

Auth users = Syncuser

Secrets file =/etc/rsyncd.pass

Add a virtual user and password for primary and standby authentication

Vim/etc/rsyncd.pass

syncuser:12345

Assign 600 permissions when editing is complete

chmod Rsyncd.pass

Start rsync Service after completion

Rsync--daemon--config=/etc/rsyncd.conf

Check startup, rsync default port 873

Ps-ef |grep rsync |grep-v grep

NETSTAT-LNT |grep 873

Lsof-i tcp:873

2, Configuration Rsync-master

Add Password verification files, note that only passwords are required

Vim/etc/rsyncd.pass

12345

chmod Rsyncd.pass

Test the Rsync service to push the/data/folder contents of the master side to the slave side

Rsync-avz-p/data/[email protected]::d ATA--password-file=/etc/rsyncd.pass

second, on the master side Installation Configuration inotify Service

1, check whether support inotify, the following instructions system support INotify Service

[Email protected] mp3]# ls-l/proc/sys/fs/inotify/

Total 0

-rw-r--r--1 root root 0 Apr 09:17 max_queued_events

-rw-r--r--1 root root 0 Apr 09:17 max_user_instances

-rw-r--r--1 root root 0 Apr 09:17 max_user_watches

2. Download and install Inotify-tool tools

wget http://nchc.dl.sourceforge.net/project/inotify-tools/inotify-tools/3.13/inotify-tools-3.13.tar.gz

Download to local, unzip and install

# tar XZVF inotify-tools-3.14.tar.gz
# CD inotify-tools-3.14
#./configure --prefix=/usr/local/inotify
# make &&make install
3, complete installation, to/usr/local/inotify/bin under the establishment of inotify monitoring script, content detection server/data and client/data directory is consistent, inconsistent rsync synchronization

[Email protected] etc]# vim/usr/local/inotify/bin/inotify_rsync.sh

#!/bin/bash

Srcdir= "/data/"

ip= "192.168.6.128"

dstdir= "Data"

/usr/local/inotify/bin/inotifywait-mrq--timefmt '%d/%m/%y-%h:%m '--format '%T%w%f '-e modify,delete,create,attrib ${ Srcdir} | while read file;

Do

For I in ${ip}

Do

Rsync-avz--progress--password-file=/etc/rsyncd.pass ${srcdir} [email Protected]${i}::${dstdir} Done

Done

~

Give script permission to execute

#chmod +x inotify_rsync.sh

Running in the background

#./inotify_rsync.sh &

4, testing, by modifying the/data content on the Mater side, you can view slave/data directory content

In addition, the Rsync service can be transferred using the SSH channel

SSH-free authentication

Server-side command: ssh-keygen-t RSA

SCP. ssh/id_rsa.pub [Email protected]:~.ssh/id_rsa.pub

Client commands: Cat id_rsa.pub >>. Ssh/authorized_keys

chmod. Ssh/authorized_keys

Rsync-avz-p/Local Directory-e ' ssh-p 22 ' user @ip:/directory push local directory to remote

Rsync-avz-p-E ' ssh-p 22 ' user @ip:/directory/local directory grab remote directory to local

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Real-time synchronization in Linux under Rsync+inotify