Automatic Incremental Backup Using rsync in linux

Rsync is a data image backup tool in unix-like systems. It can be used not only in linux systems, but also in windows systems and cross-platform data backup. Now many webmasters use it.

Requirement: content on a server is backed up to a remote disaster recovery server on a regular basis every day. To save space and improve transmission efficiency, Incremental backup is used.
Expansion requirement: the two servers synchronize all data in a directory in one-way and two-way in real time.

Environment: cent OS 5 (5.4 5.5 5.6 tested), with rsync included in the system.
1. Install rsync (ignored if rsync is already installed)

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Wget http://rsync.samba.org/ftp/rsync/src/rsync-3.0.7.tar.gz Tar xvfz rsync-3.0.7.tar.gz Cd rsync-3.0.7 ./Configure -- prefix =/usr/local/rsync Make & make install

2. Configure rsync to create an rsyncd. conf file.

Vim/etc/rsyncd. conf

Enter the following content:

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Uid = nobody Gid = nobody Max connections = 36000 Use chroot = no Log file =/var/log/rsyncd. log Pid file =/var/run/rsyncd. pid Lock file =/var/run/rsyncd. lock [Htdocs] Comment = backup htdocs Path =/opt/htdocs/view Ignore errors Read only = yes Host allow = * Host deny = * Secrets file =/etc/rsyncd. passwd Auth users = bakccad

Modify:

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Vim/etc/rsyncd. passwd

Input:

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Username: 13577531

Run:

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Chmod 600/etc/rsyncd. conf Chmod 600/etc/rsyncd. passwd

3. Start rsync on the server:

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/Usr/local/rsync/bin/rsync -- daemon

Client:
The client does not need to be installed. You only need to edit the password file and enter the password:

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Vim/etc/rsyncd. passwd

Input:
13577531
Run:

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Chmod 600/etc/rsyncd. passwd

The client can execute the following command to synchronize data from the server to the local machine:

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Rsync-azP -- delete bakccad@1.2.3.4: htdocs/opt/bakroot/rsyncwww/view -- password-file =/etc/rsync. passwd

In the command, htdocs is the name configured on the server. The following path is the saved path. The password file is followed by the password file. The password file only requires a password (if the client uses the user: passwd format, an error will occur ).

Attachment. If you only back up your data, you can use the shell command to back up the data.

Set in cron and execute at every Monday (full backup every Monday, Incremental backup for the rest of the time)

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# Vi backup. sh Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/--> #! /Bin/bash # Define Dayofweek = 'date "+ % u "' Today = 'date "+ % Y % m % d "' Source =/data/ Backup =/backup/ # Action Cd $ backup If [$ dayofweek-eq 1]; then If [! -F "full1_today.tar.gz"]; then Rm-rf snapshot Tar-g snapshot-zcf "full1_today.tar.gz" $ source -- exclude $ sourceserver. log Fi Else If [! -F "inc$today.tar.gz"]; then Tar-g snapshot-zcf "inc0000today.tar.gz" $ source -- exclude $ sourceserver. log Fi Fi

Back up the data in the directory you specified.