一、概述
一般rsync软件是通过crond这支后台进行(计划任务)来实现自动同步数据,如今已有更好的开源软件来代替使用crond了,那就是lsyncd( Live Syncing (Mirror) Daemon),它的工作原理:监视本地(rsync client)的目录,当源数据有文件或目录更新时,更新本地文件或目录到远端机器(rsync server),保持实时文件同步,但是它更新数据时需要远端rsync server运行rsync demon
配置环境如下
(1)需要配置rsyncd.conf文件的一端,称为rsync server
(2)不需要配置rsyncd.conf文件的一端,称为rsync client
(3)本次环境如下
rsync服务器:192.168.90.27(安装rsync)
rsync客户端:192.168.90.26(安装rsync+lsyncd)
lsyncd的功能:
(1)开源软件lsyncd采用inotify原理监听某一目录,如果目录内发生增、删、改、利用rsync协议自动同步到多个服务器
(2)inotify,从kernel 2.6.13开始正式并入内核,RHEL5支持
(3)可以本地多点目录的监控并实现到远程目录的同步
(4)在rsync client上通过lsyncd监控并推送数据给rsync server的rsync daemon,rsync server接收lsyncd推送过来的数据,并写入本地磁盘
(5)官方介绍:http://code.google.com/p/lsyncd
注意:而对于那种实时都在变化的数据(例如:数据库),那么这种数据的同步,DRBD技术是一个更好的选择
二、软件的安装配置
1、服务器端192.168.90.27
下载安装rsync
wget http://rsync.samba.org/ftp/rsync/rsync-3.1.0.tar.gz tar -zxf rsync-3.1.0.tar.gz cd rsync-3.1.0 ./configure --disable-ipv6 && make && make install
配置rsync
vi /etc/rsyncd.conf
log file=/var/log/rsyncd.log pid file=/var/run/rsyncd.pid lock file=/var/run/rsync.lock max connections=8 port=1873 use chroot=no [web-upload] uid=bookres gid=bookres read only=false hosts allow=192.168.90.26 path=/usr/local/project/web/filedata/upload/save read only=false ignore errors ignore nonreadable
设置开机启动
vi /etc/rc.d/init.d/web-rsync
#! /bin/bash # chkconfig: - 85 15 # description: Starts and Stops the web-rsync daemon. # Default-Start: 2 3 4 5 # Default-Stop: 0 1 6 # Short-Description: starts the web-rsync web server # source function library. . /etc/rc.d/init.d/functions status1=$(ps -ef | egrep "rsync --daemon.*--config=/etc/rsyncd.conf" | grep -v 'grep') pidfile="/var/run/rsyncd.pid" start_rsync="rsync --daemon --config=/etc/rsyncd.conf" function start() { if [ "${status1}X" == "X" ];then rm -f $pidfile ${start_rsync} status2=$(ps -ef | egrep "rsync --daemon.*--config=/etc/rsyncd.conf" | grep -v 'grep') if [ "${status2}X" != "X" ];then echo "rsync service start.......OK" fi else echo "rsync service is running !" fi } function stop() { if [ "${status1}X" != "X" ];then kill -9 $(cat $pidfile) status2=$(ps -ef | egrep "rsync --daemon.*--config=/etc/rsyncd.conf" | grep -v 'grep') if [ "${statusw2}X" == "X" ];then echo "rsync service stop.......OK" fi else echo "rsync service is not running !" fi } function status() { if [ "${status1}X" != "X" ];then echo "rsync service is running !" else echo "rsync service is not running !" fi } function restart() { if [ "${status1}X" == "X" ];then echo "rsync service is not running..." start else stop start fi } case $1 in "start") start ;; "stop") stop ;; "status") status ;; "restart") restart ;; *) echo echo "Usage: $0 start|stop|restart|status" echo esac exit 0
加到开机启动
chkconfig --add web-rsync
chkconfig web-rsync on
启动
service web-rsync start
2、客户端192.168.90.26
下载安装rsync,不需要配置文件
wget http://rsync.samba.org/ftp/rsync/rsync-3.1.0.tar.gz tar -zxf rsync-3.1.0.tar.gz cd rsync-3.1.0 ./configure --disable-ipv6 && make && make install
下载安装lsyncd
wget https://lsyncd.googlecode.com/files/lsyncd-2.1.5.tar.gz tar -zxf lsyncd-2.1.5.tar.gz cd lsyncd-2.1.5 ./configure && make && make install
如果编译安装失败,lsyncd依赖lua组件,lua比较难编译安装, 建议使用 yum install lsyncd 安装
配置lsyncd
vi /etc/lsyncd.conf
settings { logfile = "/var/log/lsyncd.log", statusFile = "/var/log/lsyncd-status.log", pidfile = "/var/run/lsyncd.pid", statusInterval = 1, maxProcesses = 8, } sync{ default.rsync, source = "/usr/local/project/web/filedata/upload/save", target = "192.168.90.27::web-upload", rsync = { binary = "/usr/local/bin/rsync", archive = true, compress = true, checksum = false, ipv6 = false, _extra = {"--port=1873"} } }
设置开机启动
vi /etc/rc.d/init.d/lsyncd
#!/bin/bash # # lsyncd: Starts the lsync Daemon # # chkconfig: 345 80 30 # 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 # config: /etc/lsyncd.lua # pidfile: /var/run/lsyncd.pid # Source function library. . /etc/init.d/functions RETVAL=0 PIDFILE="/var/run/lsyncd.pid" LOCKFILE="/var/lock/subsys/lsyncd" LSYNCD="/usr/bin/lsyncd" CONFIG="/etc/lsyncd.conf" PROG="lsyncd" start() { echo -n "Starting $PROG: " if [ -f $PIDFILE ]; then PID=`cat $PIDFILE` echo $PROG already running: $PID exit 1; else daemon --pidfile=$PIDFILE $LSYNCD -pidfile $PIDFILE $CONFIG RETVAL=$? echo [ $RETVAL -eq 0 ] && touch $LOCKFILE return $RETVAL fi } stop() { echo -n "Stopping $PROG: " killproc lsyncd echo rm -f $LOCKFILE } case "$1" in start) start ;; stop) stop ;; status) status lsyncd ;; restart) stop start ;; *) echo "Usage: {start|stop|status|restart}" exit 1 ;; esac exit $?
修改inotify相关限制配置,因为lsyncd的核心为inotify:
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