Install and configure lsyncd on centos

Introduction :- Lsyncd watches a local directory trees event monitor interface (inotify or fsevents). It aggregates and combines events for a few seconds and then spawns one (or more) process(es) to synchronize the changes. By default this is rsync. Lsyncd is thus a light-weight live mirror solution that is comparatively easy to install not requiring new filesystems or blockdevices and does not hamper local filesystem performance.

Install following dependencies:

yum install gcc-c+\+

yum install lua

yum install lua-devel

Now proceed for lsyncd installation:
Login on server as a “root” user.

cd /usr/local/
 
wget http://lsyncd.googlecode.com/files/lsyncd-2.1.5.tar.gz
 
tar \-xvzf lsyncd-2.1.5.tar.gz
 
cd lsyncd-2.1.5

./configure
 
make
 
make install

Create Linux daemon (say lsyncd) which call up our customized lsyncd config file. Daemon script would be like…
Place this file inside /etc/rc.d/init.d/

. /etc/rc.d/init.d/functions
 
user=anj
config="/lsyncd.lua"
lsyncd="/usr/local/bin/lsyncd"
lockfile="/lsyncd"
prog="lsyncd"
RETVAL=0
 
start() {
        if [ -f $lockfile ]; then
        echo -n $"$prog is already running: "
        echo
        else
        echo -n $"Starting $prog: "
        #su - $user -c "$lsyncd $config -insist"
        daemon --user $user $lsyncd $config -insist
        RETVAL=$?
        echo
        [ $RETVAL = 0 ] && su - $user -c "touch $lockfile"
        return $RETVAL
        fi
    }
stop() {
        echo -n $"Stopping $prog: "
        killproc -d 60 lsyncd
        RETVAL=$?
        echo
        [ $RETVAL = 0 ] && rm -f $lockfile
        return $RETVAL
    }
case "$1" in
        start)
        start
        ;;
        stop)
        stop
        ;;
        restart)
        stop
        start
        ;;
        status)
        status lsyncd
        ;;
        *)
 
        echo "Usage: lsyncd {start|stop|restart|status}"
        exit 1
    esac
 
    exit $?

Now configure lsyncd config file (lsyncd.lua). In this file we have our sync configurations.
It should be something like

--SETTINGS
settings {
    logfile         = "/lsyncd.log",
    statusFile      = "/lsyncd.stat",
    statusInterval  = 300
    }
--ENDSETTINGS
 
--SERVERS
 serverlist = {"SERVER1:DISTINATION",
"SERVER2:DISTINATION"}
--ENDSERVERS
 
 
for _, server in ipairs(serverlist) do
  sync {
    default.rsync,
    source="",
    target=server,
     delay = 30,
    rsync  = {
        protect_args = false
    }
  }
end

How to start and stop

/etc/init.d/lsyncd start
/etc/init.d/lsyncd stop

Note:-
There might be the issue during start of lsyncd, as some time list of files are more than max user watches. For fixing this we need to change from following file.

/proc/sys/fs/inotify/max_user_watches

Command

echo “819211” > /proc/sys/fs/inotify/max_user_watches