Shulou(Shulou.com)06/03 Report--

Rsync introduction

Rsync, English full name is remote synchronize, is a remote synchronization function of free software, it can synchronize files at the same time, can maintain the permissions of the original files, time, soft and hard links and other additional information. Rsync provides a quick way to synchronize files between the client and the remote file server, and files can be transferred through ssh. It is even possible to synchronize only the changed parts of a file, so it is possible to synchronize data quickly. At the same time, rsync can also synchronize local data and delete files and directories.

Inotify introduction

Inotify is a Linux kernel feature that monitors the file system and issues timely event warnings to specialized applications, such as delete, read, write, and unmount operations. You can also track details such as the source and target of the activity.

Automatic synchronization based on rsync+notify

If you want to achieve timing synchronization data, you can add rsync to the timing task on the client side, but the synchronization time granularity of the timing task can not meet the requirements of real-time synchronization. The inotify file system monitoring mechanism is provided after Linux kernel 2.6.13. Real-time synchronization can be achieved through rsync+inotify combination.

Experimental requirements:

Source server: 192.168.177.132 (rsync,httpd)

Originator: 192.168.177.132 (rsync,httpd,inotify-tools)

Source server # rpm-Q rsync / / check if rsync has the configuration file # vim / etc/rsyncd.conf / / rsync installed uid = nobody gid = nobody use chroot = yes address = 192.168.177.132 port 873 log file = / var/log/rsyncd.log pid file = / var/run/rsyncd.pid hosts allow = 192.168.177.0) path = / var/www/html comment = www.kgc.cn read only = yes dont compress = *. Gz * .tgz * .zip * .z * .Z * .rpm * .deb * .bz2 auth users = backuper secrets file = / etc/rsyncd_users.db# vim / etc/rsyncd_users.db backuper:abc123 / / format of account and password # chmod 600 / etc/rsyncd_users.db# yum install httpd-y / / install web service # rsync-daemon / / start rsync service # systemctl stop firewalld.service / / turn off firewall # setenforce 0 / / add Strong security features # chmod 777 / var/www/html/# cd / var/www/html# echo "this is test" > 123.txt

The initiator # systemctl stop firewalld.service# setenforce 0 / / must first turn off firewall interaction. Enter the address of the source server # rsync-avz backuper@192.168.177.132::wwwroot / opt/ without entering the password # vim / etc/server.pass# chmod 600 / etc/server.pass# rsync-az-- delete-- password-file=/etc/server.pass backuper@192.168.177.132::wwwroot / opt

Rsync+inotify automatic synchronization

The inotify is installed at the initiator.

Rsync is on the source server

Source server: # vim / etc/rsyncd.conf read only = no# pkill-9 rsync# cd / var/run/# rm-rf rsyncd.pid / / delete pid process # rsync-daemon / / restart service initiator: # chmod 777 / var/www/html/# tar zxvf inotify-tools-3.14.tar.gz-C / opt / / decompress # cd inotify-tools-3.14/. / configure# yum install gcc gcc-c++-y / / install Compilation environment # make & & make install# vim / etc/sysctl.conf / / for optimization fs.inotify.max_queued_events = 16384fs.inotify.max_user_instances = 1024fs.inotify.max_user_watches = 104857 effective sysctl-p / / effective immediately # inotifywait-mrq-e modify Create,move,delete / var/www/html/ A site monitoring # vim / opt/inotify.sh / / write a script that can be synchronized #! / bin/bashINOTIFY_CMD= "inotifywait-mrq-e modify,create,attrib,move Delete / var/www/html/ "RSYNC_CMD=" rsync-azH-- delete-- password-file=/etc/server.pass / var/www/html/ backuper@192.168.177.132::wwwroot/ "$INOTIFY_CMD | while read DIRECTORY EVENT FILEdo if [$(pgrep rsync | wc-l)-le 0] Then $RSYNC_CMD fidone# chmod + x inotify.sh#. / inotify.sh

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