rsync lsync

 

[1]	Install xinetd on HostA and HostB.

[root@lan ~]#  yum -y install xinetd [root@lan ~]#  vi /etc/xinetd.d/rsync # default: off # description: The rsync server is a good addition to an ftp server, as it \ #      allows crc checksumming etc. service rsync { disable =  no # change socket_type = stream wait = no user = root server = /usr/bin/rsync server_args = --daemon log_on_failure += USERID } [root@lan ~]#  /etc/rc.d/init.d/xinetd start Starting xinetd: [  OK  ] [root@lan ~]#  chkconfig xinetd on [root@lan ~]#  chown nobody. /home/backup [root@lan ~]#  vi /etc/rsyncd.conf # any name you like [site] # destination directory path = /home/backup # IP address you allow that connect to this server hosts allow = 192.168.0.0/24 # allow update read only = false

[2]	Install and configure Lsync on HostA. Get latest lsync from here when you run wget.

# install some requied packages [root@www ~]#  yum -y install libxml2-devel zlib-devel readline-devel [root@www ~]#  wget http://lsyncd.googlecode.com/files/lsyncd-1.26.tar.gz [root@www ~]#  tar zxvf lsyncd-1.26.tar.gz [root@www ~]#  cd lsyncd-1.26 [root@www lsyncd-1.26]#  ./configure [root@www lsyncd-1.26]#  make [root@www lsyncd-1.26]#  make install [root@www lsyncd-1.26]#  cp lsyncd.conf.xml /etc/lsyncd.conf.xml [root@www lsyncd-1.26]#  cd [root@www ~]#  rm -rf lsyncd-1.26 [root@www ~]#  vi /etc/lsyncd.conf.xml # line 61: change to mirrored directory <source path=" /var/www/html "/> # line 62: destination directory which name is the one in rsyncd.conf on the section [1] <target path=" 192.168.0.20::site/ "/>  [root@www ~]#  vi /etc/rc.d/init.d/lsyncd     # create init script # it's an example #!/bin/bash # # lsyncd: Starts the lsync Daemon # # chkconfig: 345 99 90 # description:  Lsyncd uses rsync to synchronize local directories with a remote # machine running rsyncd. Lsyncd watches multiple directories # trees through inotify. The first step after adding the watches # is to, rsync all directories with the remote host, and then sync # single file buy collecting the inotify events. # processname: lsyncd . /etc/rc.d/init.d/functions config="/etc/lsyncd.conf.xml" lsyncd="/usr/local/bin/lsyncd" lockfile="/var/lock/subsys/lsyncd" prog="lsyncd" RETVAL=0 start() { if [ -f $lockfile ]; then echo -n $"$prog is already running: " echo else echo -n $"Starting $prog: " daemon $lsyncd --conf=$config RETVAL=$? echo [ $RETVAL = 0 ] && touch $lockfile return $RETVAL fi } stop() { echo -n $"Stopping $prog: " killproc $lsyncd RETVAL=$? 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 $? [root@www ~]#  vi /etc/logrotate.d/lsyncd # set logrotation /var/log/lsyncd {    daily    copytruncate    compress    notifempty    missingok    postrotate      /etc/rc.d/init.d/lsyncd restart 2>&1 > /dev/null || true    endscript } [root@www ~]#  chmod 755 /etc/rc.d/init.d/lsyncd [root@www ~]#  /etc/rc.d/init.d/lsyncd start Starting lsyncd:  [  OK  ] [root@www ~]#  chkconfig --add lsyncd [root@www ~]#  chkconfig lsyncd on

[3]	Make sure on HostB that files are copied normally.