sersync其实是利用inotify和rsync两种软件技术来实现数据实时同步功能的，inotify是用于监听sersync所在服务器上的文件变化，结合rsync软件来进行数据同步，将数据实时同步给客户端服务器。
工作过程：在同步主服务器上开启sersync，负责监听文件系统的变化，然后调用rsync命令把更新的文件同步到目标服务器上，主服务器上安装sersync软件，目标服务器上安装rsync服务
1、客户端配置
[root@localhost2 ~]# cat /etc/rsyncd.conf ##created by cai at 2018-2-24 uid=rsync gid=rsync use chroot = no max connections = 200 timeout = 300 pid file = /var/run/rsyncd.pid lock file = /var/run/rsync.lock log file = /var/log/rsyncd.log [data] path = /data/ ignore errors read only = false list = false hosts allow = 192.168.181.128:52000/24 hosts deny = 0.0.0.0/32 auth users = rsync_body secrets file = /etc/rsync.password
[root@localhost2 ~]# ls -ld /data/
drwxrwxrwx. 3 rsync rsync 4096 Feb 24 16:58 /data/
[root@localhost2 ~]# cat /etc/rsync.password
rsync_body:admin
[root@localhost2 ~]# ls -ld /etc/rsync.password
-rw-------. 1 root root 17 Feb 24 16:26 /etc/rsync.password #600权限
[root@localhost2 ~]# netstat -lntup| grep "rsync"
tcp 0 0 0.0.0.0:873 0.0.0.0:* LISTEN 1497/rsync
tcp 0 0 :::873 :::* LISTEN 1497/rsync
2、主服务器配置
[root@localhost1 ~]# cat /etc/rsync.password admin [root@localhost1 ~]# ls -ld /etc/rsync.password -rw------- 1 root root 6 Feb 24 03:54 /etc/rsync.password
3、安装sersync服务
采用inotify来对文件进行监控，当监控到文件有文件发生改变的时候，就会调用rsync实现触发式实时同步！
安装sersync（注意sersync是工作在rsync的源服务器上，也就是客户端上）
[root@salt-client01 ~]# cd /usr/local/src/ [root@salt-client01 src]# tar -zxvf sersync2.5.4_64bit_binary_stable_final.tar.gz -C /usr/local/ GNU-Linux-x86/ GNU-Linux-x86/sersync2 GNU-Linux-x86/confxml.xml [root@salt-client01 src]# cd /usr/local/ [root@salt-client01 local]# mv GNU-Linux-x86 sersync [root@salt-client01 local]# cd sersync/ [root@salt-client01 sersync]# mkdir conf bin log [root@salt-client01sersync]# mv confxml.xml conf [root@salt-client01sersync]# mv sersync2 bin/sersync
修改配置文件
***********************************30行开始******************************<commonParams params="-artuz"/> #-artuz为rsync同步时的参数<authstart="true" users="rsync的虚拟用户名(rsync_backup)" passwordfile="rsync的密码文件"/><userDefinedPort start="true"port="873"/><!-- port=874 --><timeout start="false" time="100"/><!--timeout=100 --><sshstart="false"/>************************************第36行***********************************<failLogpath="自己定义的log文件夹(/usr/local/sersync/log)rsync_fail_log.sh"timeToExecute="60"/><!--defaultevery 60mins execute once-->********************************************************************************注：若有多个目录备份可以穿件多个配置文件在启动时的-o参数中添加即可[root@salt-client01 conf]# diff confxml.xml confxml.xml.bak 24,25c24,25 < <localpath watch="/data/"> #data就是本地需要同步的文件夹到服务器端的目录 < <remote ip="192.168.91.166" name="data"/> #data (server的模块名)是rsync 服务端的文件夹，也就是推送到服务器端的目标文件夹，可以配置多个， --- > <localpath watch="/opt/tongbu"> > <remote ip="127.0.0.1" name="tongbu1"/> 31c31 < <auth start="true" users="rsync_body" passwordfile="/etc/rsync.password"/> #true 才能生效，rsync_body同步时候虚拟账号，后面是密码文件 --- > <auth start="false" users="root" passwordfile="/etc/rsync.pas"/> 33c33 < <timeout start="true" time="100"/><!-- timeout=100 --> #true 才能生效 --- > <timeout start="false" time="100"/><!-- timeout=100 --> 36c36 < <failLog path="/usr/local/sersync/log/rsync_fail_log.sh" timeToExecute="60"/><!--default every 60mins execute once--> #检测rsync进程判断，没有自动启 --- > <failLog path="/tmp/rsync_fail_log.sh" timeToExecute="60"/><!--default evePry 60mins execute once-->
启动sersync
[root@salt-client01 src]# echo 'export PATH=$PATH:/usr/local/sersync/bin'>>/etc/profile #声明环境变量 [root@salt-client01 src]# source /etc/profile [root@salt-client01 src]# sersync2 -r -d -o /usr/local/sersync/conf/confxml.xml #启动 set the system param execute：echo 50000000 > /proc/sys/fs/inotify/max_user_watches execute：echo 327679 > /proc/sys/fs/inotify/max_queued_events parse the command param option: -r rsync all the local files to the remote servers before the sersync work option: -d run as a daemon option: -o config xml name： /usr/local/sersync/conf/confxml.xml daemon thread num: 10 parse xml config file host ip : localhost host port: 8008 daemon start，sersync run behind the console use rsync password-file : user is rsync_body passwordfile is /etc/rsync.password config xml parse success please set /etc/rsyncd.conf max connections=0 Manually sersync working thread 12 = 1(primary thread) + 1(fail retry thread) + 10(daemon sub threads) Max threads numbers is: 22 = 12(Thread pool nums) + 10(Sub threads) please according your cpu ，use -n param to adjust the cpu rate ------------------------------------------ rsync the directory recursivly to the remote servers once working please wait... execute command: cd /data && rsync -artuz -R --delete ./ --timeout=100 rsync_body@192.168.91.166::data --password-file=/etc/rsync.password >/dev/null 2>&1 run the sersync: watch path is: /data #此时可以看出sersync已经启动成功了#检测脚本 [root@salt-client01 log]# pwd /usr/local/sersync/log [root@salt-client01 log]# vim rsync_fail_log.sh [root@salt-client01 log]# chmod +x rsync_fail_log.sh [root@salt-client01 ~]# cat /usr/local/sersync/log/rsync_fail_log.sh #!/bin/bash #Purpose: Check sersync whether it is alive #Author: cai meng zhi SERSYNC="/usr/local/sersync/bin/sersync2" CONF_FILE="/usr/local/sersync/conf/confxml.xml" STATUS=$(ps aux |grep 'sersync2'|grep -v 'grep'|wc -l) if [ $STATUS -eq 0 ]; then$SERSYNC -d -r -o $CONF_FILE & elseexit 0; fi 脚本写好以后，添加到计划任务中去 */1 * * * * /bin/bash /usr/local/sersync/log/rsync_fail_log.sh > /dev/null 2>&1测试同步： 客户端新增文件 [root@salt-client01 data]# cp /etc/passwd 192.168.91.156.passwd [root@salt-client01 data]# ll total 4 -rw-r--r-- 1 root root 1928 Nov 10 18:15 192.168.91.156.passwd -rw-r--r-- 1 root root 0 Nov 10 17:27 3 服务端检测 [root@salt-master data]# cd /data/ [root@salt-master data]# ll total 8 -rw-r--r-- 1 root root 1928 Nov 10 18:15 192.168.91.156.passwd #说明已经同步过来了 -rw-r--r-- 1 root root 0 Nov 10 17:27 3 drwxr-xr-x 2 root root 4096 Nov 10 17:27 data客户端测试删除 [root@salt-client01 data]# rm rf 192.168.91.156.passwd rm: cannot remove `rf': No such file or directory rm: remove regular file `192.168.91.156.passwd'? y [root@salt-client01 data]# ll total 0 -rw-r--r-- 1 root root 0 Nov 10 17:27 3 [root@salt-client01 data]#服务器端： [root@salt-master data]# ll total 4 -rw-r--r-- 1 root root 0 Nov 10 17:27 3 #说明已经删除掉了 drwxr-xr-x 2 root root 4096 Nov 10 17:27 data
4、常见错误汇总
错误一： @ERROR: auth failed on module xxxxx rsync: connection unexpectedly closed(90 bytes read so far) rsync error: error in rsync protocoldata stream (code 12) at io.c(150) 说明：这是因为密码设置错了，无法登入成功，检查一下rsync.pwd，看客服是否匹配。还有服务器端没启动rsync 服务也会出现这种情况。错误二： password file must not beother-accessible continuing without password file Password: 说明：这是因为rsyncd.pwdrsyncd.sec的权限不对，应该设置为600。如：chmod600 rsyncd.pwd错误三： @ERROR: chroot failed rsync: connection unexpectedly closed(75 bytes read so far) rsync error: error in rsync protocoldata stream (code 12) at io.c(150) 说明：这是因为你在 rsync.conf中设置的 path 路径不存在，要新建目录才能开启同步错误四： rsync: failed to connect to218.107.243.2: No route to host (113) rsync error: error in socket IO (code10) at clientserver.c(104) [receiver=2.6.9] 说明：防火墙问题导致，这个最好先彻底关闭防火墙，排错的基本法就是这样，无论是S还是C，还有ignore errors选项问题也会导致错误五： @ERROR: access denied to www fromunknown (192.168.1.123) rsync: connection unexpectedly closed(0 bytes received so far) [receiver] rsync error: error in rsync protocoldata stream (code 12) at io.c(359) 说明：此问题很明显，是配置选项hostallow的问题，初学者喜欢一个允许段做成一个配置，然后模块又是同一个，致使导致错误六： rsync error: received SIGINT,SIGTERM, or SIGHUP (code 20) at rsync.c(244) [generator=2.6.9] rsync error: received SIGUSR1 (code19) at main.c(1182) [receiver=2.6.9] 说明：导致此问题多半是服务端服务没有被正常启动，到服务器上去查查服务是否有启动，然后查看下 /var/run/rsync.pid 文件是否存在，最干脆的方法是杀死已经启动了服务，然后再次启动服务或者让脚本加入系统启动服务级别然后shutdown -r now服务器错误七： rsync: read error: Connection resetby peer (104) rsync error: error in rsync protocoldata stream (code 12) at io.c(604) [sender=2.6.9] 说明：原数据目录里没有数据存在
