How to Install and use Lsyncd on CentOS 7 / RHEL 7 rsync

Lsyncd stands for “Live Syncing Daemon“, as the name suggest lsyncd is used to sync or replicate files & directories locally and remotely after a specific time of interval. It uses rsync & ssh in the backend.

Lsyncd works on Master and Slave architecture where it monitors the directory on the master server, if any changes or modification are done then lsyncd will replicate the same on its slave servers after specific interval of time.

In this article we will discuss how to install and use lsyncd on CentOS 7 & RHEL 7.

 

Scenario : Suppose want to sync the folder “/var/www/html” from Master server to Slave server

  • Master Server’s IP = 192.168.1.14
  • Slave Server’s IP = 192.168.1.15
  • Directory to be Sync = /var/www/html
First Enable Key based authentication between Master and Slave Server.

Login to Master server & generate the public and Private keys using ssh-keygen command.

lsyncd-ssh-keygen

Now Copy the public key using ssh-copy-id command to slave server

[root@linuxtechi ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.1.15
Step:1 Login to Master Server and Install Lsyncd Package

Install the lsyncd dependency packages using below yum command.

[root@linuxtechi ~]# yum install lua lua-devel pkgconfig gcc asciidoc

To install lsyncd package using yum command , first enable the EPEL repo as lsyncd rpm is not available in the default repos.

[root@linuxtechi ~]# rpm -iUvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
[root@linuxtechi ~]# yum install lsyncd
Step:2 Set up Configuration File of Lsyncd

Copy the sample Configuration to /etc/lsyncd.conf

[root@linuxtechi ~]# cp /usr/share/doc/lsyncd-2.1.5/examples/lrsync.lua /etc/lsyncd.conf

Add the following Lines to the config file.

[root@linuxtechi ~]# cat /etc/lsyncd.conf 
----
-- User configuration file for lsyncd.
--
-- Simple example for default rsync.
--
settings = {
 logfile = "/var/log/lsyncd.log",
 statusFile = "/var/log/lsyncd.stat",
 statusInterval = 2,
}
sync{
 default.rsync,
 source="/var/www/html",
 target="192.168.1.15:/var/www/html",
 rsync={rsh ="/usr/bin/ssh -l root -i /root/.ssh/id_rsa",}
}
[root@linuxtechi ~]#

lsyncd-conf

Step:3 Start the Service and enable it at reboot
[root@linuxtechi ~]# systemctl start lsyncd
[root@linuxtechi ~]# systemctl enable lsyncd
ln -s '/usr/lib/systemd/system/lsyncd.service' '/etc/systemd/system/multi-user.target.wants/lsyncd.service'
Step:4 Analyze the Replication and Logs Report.

As we can see that we are using “root” user for syncing data , as per your requirement you can change the user name.

In the log File we can see the status of replication whether the replication is completed or Not.

[root@linuxtechi ~]# tail -10 /var/log/lsyncd.log
Sun Jul 26 12:53:04 2015 Normal: recursive startup rsync: /var/www/html/ -> 192.168.1.15:/var/www/html/
Sun Jul 26 12:53:56 2015 Normal: Startup of "/var/www/html/" finished.
[root@linuxtechi ~]#

Using Stat file we view the lsyncd status Report. Sample Example is shown below

[root@linuxtechi ~]# more /var/log/lsyncd.stat 

Lsyncd status report at Sun Jul 26 12:53:58 2015
Sync1 source=/var/www/html/
There are 0 delays
Excluding:
 nothing.

Inotify watching 849 directories
 1: /var/www/html/
 2: /var/www/html/catalog/
 3: /var/www/html/catalog/controller/
 4: /var/www/html/catalog/controller/module/
 5: /var/www/html/catalog/controller/checkout/
 6: /var/www/html/catalog/controller/api/
 7: /var/www/html/catalog/controller/payment/
 8: /var/www/html/catalog/controller/tool/
 9: /var/www/html/catalog/controller/product/
 ---------------------
 848: /var/www/html/system/library/db/
 849: /var/www/html/system/modification/
[root@linuxtechi ~]#
0 (0)
Article Rating (No Votes)
Rate this article
Attachments
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Full Name
Email Address
Security Code Security Code
Related Articles RSS Feed
How to encrypt a partition using LUKS?
Viewed 1136 times since Fri, Jul 13, 2018
RHEL: Route network packets to go out via the same interface they came in
Viewed 2020 times since Sat, Jun 2, 2018
How do I add ethtool settings to a network device permanently?
Viewed 5438 times since Mon, May 21, 2018
Red Hat ADDING SWAP SPACE
Viewed 1280 times since Fri, Jun 8, 2018
Logowanie za pomocą kluczy Secure Shell
Viewed 2028 times since Thu, May 24, 2018
Lsyncd: live file syncronization across multiple Linux servers
Viewed 4570 times since Wed, Oct 31, 2018
RHEL: Force system to prompt for password in Single User mode
Viewed 4833 times since Sat, Jun 2, 2018
Learn how to align an SSD on Linux
Viewed 10399 times since Fri, May 15, 2020
stunnel basics and pki standards
Viewed 8584 times since Fri, Sep 28, 2018
How To Set Up an SSL Tunnel Using Stunnel on Ubuntu
Viewed 2331 times since Fri, Sep 28, 2018