目录
一、背景
二、环境
三、实验步骤
1、备份服务器操作
2、数据源服务器操作
3、测试数据同步
4、安装sersync工具，实时触发rsync进行同步
5、测试数据实时同步
四、总结
五、注意事项
一、背景
rsync 是一个用于文件同步和传输的工具，它可以在本地和远程文件系统之间同步文件。
rsync 通过增量传输的方式，只传输源和目标之间不同的部分，这使其在网络传输时非常高效。它通常用于备份、镜像和迁移任务。
二、环境
备份服务器：192.168.56.129；操作系统：centos7.9
数据源服务器：192.168.56.128；操作系统：centos7.9
三、实验步骤
1、备份服务器操作
关闭selinux，永久关闭防火墙
[root@mysql2 ~]# sed -i '/^SELINUX/s/enforcing/disable/' /etc/selinux/config
[root@mysql2 ~]# cat /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
[root@mysql2 ~]# getenforce
Disabled
[root@mysql2 ~]# systemctl stop firewalld
[root@mysql2 ~]# systemctl disable firewalld
[root@mysql2 ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:firewalld(1)
安装rsync软件
[root@mysql2 ~]# yum install rsync xinetd -y
[root@mysql2 ~]# echo "/usr/bin/rsync --daemon --config=/etc/rsyncd.conf" >> /etc/rc.d/rc.local
[root@mysql2 ~]# systemctl start xinetd
创建rsyncd.conf配置文件
[root@mysql2 ~]# vim /etc/rsyncd.conf
写入
uid = root
gid = root
use chroot = yes
max connections = 0
log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid
lock file = /var/run/rsync.lock
secrets file = /etc/rsync.pass
motd file = /etc/rsyncd.Motd
[back_data] #配置项名称（自定义）
path = /backup #备份文件存储地址
comment = A directory in which data is stored
ignore errors = yes
read only = no
hosts allow = 192.168.56.128 #允许的IP地址（数据源服务器地址）
创建用户认证文件
[root@mysql2 ~]# vim /etc/rsync.pass
写入
#格式,用户名:密码,可以设置多个,每一行一个用户名:密码
simons:123456
设置文件权限
[root@mysql2 ~]# chmod 600 /etc/rsyncd.conf #设置文件所有者读取、写入权限
[root@mysql2 ~]# chmod 600 /etc/rsync.pass #设置文件所有者读取、写入权限
启动rsync和xinetd
[root@mysql2 ~]# /usr/bin/rsync --daemon --config=/etc/rsyncd.conf
[root@mysql2 ~]# ps aux |grep rsyncd
root 8566 0.0 0.0 114852 576 ? Ss 20:37 0:00 /usr/bin/rsync --daemon --config=/etc/rsyncd.conf
root 8572 0.0 0.0 112824 988 pts/0 S+ 20:38 0:00 grep --color=auto rsyncd
[root@mysql2 ~]# systemctl start xinetd
2、数据源服务器操作
关闭selinux，永久关闭防火墙
[root@mysql ~]# sed -i '/^SELINUX/s/enforcing/disabled/' /etc/selinux/config
[root@mysql ~]# systemctl stop firewalld
[root@mysql ~]# systemctl disable firewalld
[root@mysql ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:firewalld(1)
安装rsync软件
[root@mysql ~]# yum install rsync xinetd -y
#设置开机启动
[root@mysql ~]# echo "/usr/bin/rsync --daemon" >> /etc/rc.d/rc.local
[root@mysql ~]# cat /etc/rc.d/rc.local
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
touch /var/lock/subsys/local
ulimit -n 1000000
/usr/bin/rsync --daemon
创建rsyncd.conf配置文件
#修改配置文件
vim /etc/rsyncd.conf
添加
log file = /var/log/rsyncd.log
pid file = /var/run/rsyncd.pid
lock file = /var/run/rsync.lock
motd file = /var/rsyncd.Motd
[Sync]
comment = Sync
uid = root
gid = root
port = 873
启动xinetd服务管理rsync服务
[root@mysql ~]# systemctl start xinetd
创建认证密码文件
[root@mysql ~]# vim /etc/passwd.txt
#编辑文件，添加以下内容，该密码应与目标服务器中的/etc/rsync.pass中的密码一致
123456
设置文件权限，只设置文件所有者具有读取、写入权限即可
[root@mysql ~]# chmod 600 /etc/passwd.txt
3、测试数据同步
数据源服务器192.168.56.128到备份服务器192.168.56.129，之间的数据
（在数据源服务器上的操作）
[root@mysql ~]# rsync -avH --port=873 --progress --delete /backup(要备份的数据源目录) root@192.168.56.129::back_data --password file=/etc/passwd.txt
出现如下视图，表示成功
sending incremental file list
backup/
backup/all_db.sql
875,989 100% 160.83MB/s 0:00:00 (xfr#1, to-chk=0/2)
sent 876,325 bytes received 39 bytes 1,752,728.00 bytes/sec
total size is 875,989 speedup is 1.00
4、安装sersync工具，实时触发rsync进行同步
在数据源服务器上修改inotify默认参数（inotify默认内核参数太小），修改参数：
[root@mysql backup]# sysctl -w fs.inotify.max_queued_events="99999999"
fs.inotify.max_queued_events = 99999999
[root@mysql backup]# sysctl -w fs.inotify.max_user_watches="99999999"
fs.inotify.max_user_watches = 99999999
[root@mysql backup]# sysctl -w fs.inotify.max_user_instances="65535"
fs.inotify.max_user_instances = 65535
（以上为临时修改，想要达到永久修改的目的需要写入配置文件，如下：）
[root@mysql backup]# vim /etc/sysctl.cnf
写入
fs.inotify.max_queued_events=99999999
fs.inotify.max_user_watches=99999999
fs.inotify.max_user_instances=65535
安装sersync
[root@mysql backup]# wget http://down.whsir.com/downloads/sersync2.5.4_64bit_binary_stable_final.tar.gz
--2024-03-17 10:51:26-- http://down.whsir.com/downloads/sersync2.5.4_64bit_binary_stable_final.tar.gz
正在解析主机 down.whsir.com (down.whsir.com)... 111.180.191.24
正在连接 down.whsir.com (down.whsir.com)|111.180.191.24|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 301 Moved Permanently
位置：https://down.whsir.com/downloads/sersync2.5.4_64bit_binary_stable_final.tar.gz [跟随至新的 URL]
--2024-03-17 10:51:26-- https://down.whsir.com/downloads/sersync2.5.4_64bit_binary_stable_final.tar.gz
正在连接 down.whsir.com (down.whsir.com)|111.180.191.24|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：727290 (710K) [application/octet-stream]
正在保存至: “sersync2.5.4_64bit_binary_stable_final.tar.gz”
100%[==========================================================================================>] 727,290 4.22MB/s 用时 0.2s
2024-03-17 10:51:26 (4.22 MB/s) - 已保存 “sersync2.5.4_64bit_binary_stable_final.tar.gz” [727290/727290])
解压sersync2.5.4_64bit_binary_stable_final.tar.gz
[root@mysql backup]# tar xf sersync2.5.4_64bit_binary_stable_final.tar.gz
移动解压后的文件到/usr/local改名为sersync
[root@mysql backup]# mv GNU-Linux-x86/ /usr/local/sersync
创建resync
进入目录/usr/local/sersync，备份内容
[root@mysql sersync]# cp confxml.xml confxml.xml.bak
[root@mysql sersync]# cp confxml.xml data_configxml.xml
（data_configxml.xml才是后面需要使用的配置文件）
修改data_configxml.xml配置文件
[root@mysql sersync]# vim data_configxml.xml
24
25
26
27
28
29
30
31
32
33
34
启动sersync服务
[root@mysql sersync]# /usr/local/sersync/sersync2 -d -r -o /usr/local/sersync/data_configxml.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/data_configxml.xml
daemon thread num: 10
parse xml config file
host ip : localhost host port: 8008
daemon start，sersync run behind the console
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 -artuz -R --delete ./ 192.168.56.131::back_data >/dev/null 2>&1
run the sersync:
watch path is: /backup
设置sersync监控开机自动执行
[root@mysql sersync]# echo "/usr/local/sersync/sersync2 -d -r -o /usr/local/sersync/data_configxml.xml" >>/etc/rc.d/rc.local
5、测试数据实时同步
在数据源服务器监听的/backup目录下，新建或者删除文件在备份服务器上对应的/backup目录下，查看效果
四、总结
结合使用 rsync 和 sersync 来实现高效的实时文件同步。例如，使用 sersync 来监控本地目录的变化，并在变化发生时触发 rsync 命令将文件同步到远程服务器。这样可以实现一个实时的、高效的、自动化的文件同步解决方案。
五、注意事项
确保源和目标服务器之间的网络连接稳定可靠。根据需要配置合适的过滤规则，以避免不必要的同步。监控同步过程，确保没有错误或遗漏。在生产环境中使用前，先在测试环境中验证同步的准确性和性能。
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