LINUX system uses software to synchronize data offsite (disaster recovery)

rsync is a data mirroring backup tool under Linux. Using the fast incremental backup tool Remote Sync allows remote synchronization, supports local copying, or synchronization with other SSH and rsync hosts

1. BT Panel environment:

Supported by the BT Panel software store,Refer to: https://www.bt.cn/bbs/thread-98022-1-1.html

2. Other environments:

Implementation tool: lsyncd

 lsyncd combines inotify + rsync. Lsyncd monitors the local directory tree event monitor interface (inotify or fsevents). It aggregates and combines events for a few seconds,

then spawns one (or more) process(es) to synchronize changes.

 1. Installation (lsyncd is based on rsync and requires rsync >= 3.1):

# Check the rsync version

# rsync -v

1.1,Only if rsync< 3.1, execute the following; if rsync >= 3.1, skip 1.1 this step and proceed directly to 1.2

#Check the current rsync version

rsync -v

#If the version is too low, uninstall it directly

yum -y remove rsync

#Download the rsync source code

wget http://soft.xiaoz.org/linux/rsync-3.1.3.tar.gz

#Extract

tar -zxvf rsync-3.1.3.tar.gz

#Enter the directory

cd rsync-3.1.3

#Compile and install

./configure

make install

Finally, enter rsync -v again to check whether the version has been upgraded successfully

1.2 Update the EPEL repository

yum -y install epel-release

1.3 Install lsyncd

#Install lsyncd

yum -y install lsyncd

#Check the lsyncd version

lsyncd --version

#The configuration file is located at /etc/lsyncd.conf  -- is the comment character

2. Configuration

2.1 Configure passwordless login

If you want to synchronize data from primary A: 192.168.0.1 to backup B: 192.168.0.2, primary A: 192.168.0.1 must have passwordless login permission to backup B: 192.168.0.2. This can be done by setting up key-based login. Only two commands are needed. The following commands are executed on primary A: 192.168.0.1:

#Generate the key file

ssh-keygen -t rsa

#Copy the public key to server B. -p specifies the SSH port. Enter the password to log in and copy.

Bssh-copy-id root@192.168.0.2 -p 22000 

#Test 

ssh root@192.168.0.2  -p 22000

2.2 Configure lsyncd

2.2.1 Explanation of some parameters

settings is the global configuration. Some parameters are as follows:

logfile: log file path

statusFile: process path

insist: continue running even if there is a failed target.

statusInterval: how many seconds to write to the file, default is 10s

sync is the synchronization configuration. Some parameters are as follows:

source: local file directory

host: remote server address

targetdir: remote target directory

port: SSH port of the current host, default is 22000

2.2.2 Configuration file

vi /etc/lsyncd.confEdit the configuration file, comment out or delete the default last line, and then add your own configuration

settings {

   logfile    = "/tmp/lsyncd.log",

   statusFile = "/tmp/lsyncd.status",

   insist = true,

   statusInterval = 10

}

sync {

   default.rsyncssh,   source="/home",

   host="192.168.1.2",

   targetdir="/home",

   rsync = {

     archive = true,

     compress = false,

     whole_file = false

   },

   ssh = {

     port = 220000

   }

}

Continue to enter the command lsyncd -nodaemon /etc/lsyncd.conf to run and check whether there are any errors. If there are errors, check and modify according to the error situation.

If there are no errors, exit and then enter the command: systemctl start lsyncd to start lsyncd.

Related commands:

#Start

systemctl start lsyncd

#Stop

systemctl stop lsyncd

#Restart

systemctl restart lsyncd

#Set to start automatically at boot

systemctl enable lsyncd

Windows system uses software for offsite data synchronization (disaster recovery)

Linux system uses software for offsite data synchronization (disaster recovery)

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