主要内容：
1.Sersync是什么
2.准备环境
3.Sersync的使用
4.Sersync的配置
一、Sersync是什么
实时同步:sersync/inotify
sersync:整合inotify和rsync命令
监控文件/目录是否有变化（增删改）
二、准备环境
web01
nfs01
backup
三、sersync的使用
1.准备rsync服务(nfs01)
（1）sersync 利用到了rsync的守护进程模式
（2）backup上面的共享目录为 /nfsbackup
2.准备好sersync
（1）上传 解压 加权限(sersync-master.zip在https://github.com/wsgzao/sersync下载)
[root@nfs01 GNU-Linux-x86]# tree
.
├── confxml.xml
└── sersync2
0 directories, 2 files
mv sersync2 sersync
如果要监控多个目录，比如data , data01,可以复制一份confxml.xml,修改名称为confxml_01.xml
#backup文件所属组所有者无所谓
[root@nfs01 backup]# ll -d /backup/
drwxr-xr-x. 2 root root 78 Jul 18 01:59 /backup/
[root@nfs01 backup]# cat /etc/rsync.passwd
oldboy123
[root@nfs01 backup]# ll -d /etc/rsync.passwd
-rw-------. 1 root root 23 Jun 8 02:33 /etc/rsync.passwd
3.配置confxml.xml
sersync .png
<sersync>
<localpath watch="/data">
<remote ip="10.0.0.41" name="backup_all"/>
<!--<remote ip="192.168.8.39" name="tongbu"/>-->
<!--<remote ip="192.168.8.40" name="tongbu"/>-->
</localpath>
<rsync>
<commonParams params="-az"/>
<auth start="true" users="rsync_backup" passwordfile="/etc/rsync.password"/>
<userDefinedPort start="false" port="874"/><!-- port=874 -->
<timeout start="false" time="100"/><!-- timeout=100 -->
<ssh start="false"/>
</rsync>
<failLog path="/tmp/rsync_fail_log.sh" timeToExecute="60"/><!--default every 60mins execute once-->
<crontab start="false" schedule="600"><!--600mins-->
<crontabfilter start="false">
<exclude expression="*.php"></exclude>
<exclude expression="info/*"></exclude>
</crontabfilter>
</crontab>
<plugin start="false" name="command"/>
</sersync>
3.启动实时同步服务
chmod +x /usr/local/sersync/GNU-Linux-x86/sersync
serync -dro /user/local/sersync/conf/confxml.xml
[root@nfs01 GNU-Linux-x86]# /usr/local/sersync/GNU-Linux-x86/sersync -h
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
_______________________________________________________
参数-d:启用守护进程模式
参数-r:在监控前，将监控目录与远程主机用rsync命令推送一遍
c参数-n: 指定开启守护线程的数量，默认为10个
参数-o:指定配置文件，默认使用confxml.xml文件
参数-m:单独启用其他模块，使用 -m refreshCDN 开启刷新CDN模块
参数-m:单独启用其他模块，使用 -m socket 开启socket模块
参数-m:单独启用其他模块，使用 -m http 开启http模块
不加-m参数，则默认执行同步程序
________________________________________________________________
为了以后方便操作，可以加环境变量
export PATH=$PATH:/usr/local/sersync/GNU-Linux-x86/
以后可以直接使用sersync
[root@nfs01 backup]# sersync -dro /usr/local/sersync/GNU-Linux-x86/confxml.xml
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: -d run as a daemon
option: -r rsync all the local files to the remote servers before the sersync work
option: -o config xml name： /usr/local/sersync/GNU-Linux-x86/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_backup
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 /backup && rsync -az -R --delete ./ rsync_backup@10.0.0.41::backup_all --password-file=/etc/rsync.password >/dev/null 2>&1
[root@nfs01 backup]# run the sersync:
watch path is: /backup
4.backup服务器
1.安装rsync
[root@backup ~]# yum -y install rsync
2.配置文件
[root@backup backup]# cat /etc/rsyncd.conf
uid = rsync
gid = rsync
#uid = www
#gid = www
port = 873
fake super = yes
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
ignore errors
read only = false
list = false
hosts allow = 10.0.0.31
#hosts deny = 0.0.0.0/32
auth users = rsync_backup
secrets file = /etc/rsync.password
[backup_all]
#comment = "backup dir"
path = /backup/
3.密码文件(配置和权限600)
[root@backup backup]# cat /etc/rsync.password
rsync_backup:oldboy123
[root@backup backup]# ll -d /etc/rsync.password
-rw-------. 1 root root 23 Jun 8 02:33 /etc/rsync.password
#backup文件所属组，所有者变为rsync
[root@backup backup]# ll -d /backup/
drwxr-xr-x. 2 rsync rsync 78 Jul 18 01:59 /backup/
4.启动rsyncd并设置开机自启动
[root@backup backup]# systemctl start rsyncd
[root@backup backup]# systemctl enable rsyncd
[root@backup backup]# systemctl status rsyncd
● rsyncd.service - fast remote file copy program daemon
Loaded: loaded (/usr/lib/systemd/system/rsyncd.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2019-07-18 01:09:10 CST; 56min ago
Main PID: 6453 (rsync)
CGroup: /system.slice/rsyncd.service
└─6453 /usr/bin/rsync --daemon --no-detach
Jul 18 01:09:10 backup systemd[1]: Started fast remote file copy program daemon.
5.测试
在nfs01服务器上/backup目录下创建a.log文件，backup服务器中的/backup目录已经同步过去
