Rsync remote synchronization (incremental backup)

1、rsync Service description

The configuration file ： /etc/rsyncd.conf
Default port ：tpc 837
Start the service ：rsync --daemon
Out of Service ：kill  $(cat /var/run/rsyncd.pid)
Check the port ：netstat  -anpt |  grep rsync
To restart the port, stop the port first and then start the port
 

2、 To configure rsync The source server

         （1） Set up on the server /etc/rsyncd.conf The configuration file

vim /etc/rsyncd.conf                    

uid = nobody
gid = nobody
use chroot = yes                                                  （ Locked in the source directory ）
address = 192.168.1.10                                            （ Monitor address ）
port 873                                                          （ Listening port ）
log file = /var/log/rsyncd.log                                    （ Log file location ）
pid file = /var/run/rsyncd.pid                                    （ Store process ID File location of ）
hosts allow = 192.168.1.0/24                                      （ The client address allowed to access ）
 [wwwroot]                                                        （ Shared module name ）
 path = /var/www/html                                             （ The actual path to the source directory ）                               
 comment = Document Root of 11111111                              （ remarks ）
 read only = yes                                                  （ Is it read-only ）  
 dont compress   = *.gz *.tgz *.zip *.z *.Z *.rpm *.deb *.bz2     （ File types that are no longer compressed during synchronization ）
 auth users = backuper                                            （ Authorized account ）
 secrets file = /etc/rsyncd_users.db                              （ Data file for storing account information ）

        （2） Create data file for backup account  

mkdir -p /var/www/html/    ( Under this directory are the files to be backed up )

touch /var/www/html/1.txt

vim /etc/rsyncd_users.db
（ Add account password ）

backuper:123                       （ The user is backuper, The password for 123）

chmod 600 /etc/rsyncd_users.db     （ Configure read-only permissions ）

ls -ld /var/www/html/              （ View permissions ）

        （3） start-up rsync Service program  

rsync --daemon                （ start-up rsync）

netstat -anpt | grep rsync    （ see rsync port ）

 3、 Use rsync Backup tools

        （1） Configure the representation of the source
Download the client to root Under the table of contents

rsync -avz [email protected]::wwwroot /root
 Input backuper password 

  Download the client to myweb Under the table of contents

mkdir /myweb    （ Create directory ）
rsync -avzH --delete [email protected]::wwwroot /myweb
 Input backuper password 

        （2）  Automatically rsync Backup

vim /etc/server.pass              （ preservation backuper password ）
（ Add password ）
123

chmod 600 /etc/server.pass        （ Add permissions ）

crontab -e

（ add to ）
30 22 * * * /usr/bin/rsync -az --delete --password-file=/etc/server.pass [email protected]::wwwroot /myweb        （ Every night 10 Point semi-automatic backup , The backup file is in myweb）

 4、inotify+rsync Real time synchronization

 inotify Notification interface , You can monitor changes in the file system .（ Install... On the client , Can only go up ）
        （1） adjustment inotify Kernel parameters

vim /etc/sysctl.conf

    （ add to ）
fs.inotify.max_queued_events = 16384
fs.inotify.max_user_instances = 1024
fs.inotify.max_user_watches =1048579


sysctl -p

        （2） install inotify-toosl, You need to insert the disc first ,

tar zxf inotify-tools-3.14.tar.gz -C /usr/src/

cd /usr/src/inotify-tools-3.14/

./configure && make && make install

        （3） Test monitoring directory

mkdir -p /var/www/html

inotifywait  -mrq  -e  modify,create,move,delete /var/www/html/  （ You can't stop by force ）

 New terminal   stay /var/www/html  New file , Return to the original terminal to view ,

        （4） Write triggered synchronization scripts

vim /opt/inotify_rsync.sh

( add to )

#!/bin/bash
INOTIFY_CMD="inotifywait  -mrq  -e  modify,create,move,delete /var/www/html/"
RSYNC_CMD="rsync -azH --delete --password-file=/etc/server.pass /var/www/html/ [email protected]::wwwroot"
$INOTIFY_CMD | while read DIRECTORY EVENT FILE
do
        $RSYNC_CMD
done



chmod +x /opt/inotify_rsync.sh 

echo '/opt/inotify_rsync.sh'  >> /etc/rc.local

        （5） Configuration on the server

vim   /etc/rsyncd.conf
 take  read  only = yes   Change it to 
read only  =no                          （ Set the permission to upload files , Have write permission ）



chmod  777  /var/www/html               （ Modify the permissions of the directory itself ）


kill  $(cat  /var/run/rsyncd.pid)
rsync  --daemon                         （ Stop service and start service ）

        （6） Execute script to test

/opt/inotify_rsync.sh  （ Client execution script ）

 stay /var/www/html/ create a file 

ls /var/www/html/     （ Check whether the file is uploaded on the server ）