机器：服务器A、备份服务器B
操作系统：Redhat
备份策略：rsync+crontab，定时同步。好处是增量备份，备份包括了文件权限、日期等信息，便于机器之间的快速恢复切换。
Server A:
/etc/rsyncd.conf
uid = root
gid = root
use chroot = no
max connections = 4
pid file = /var/run/rsyncd.pid
lock file = /var/run/rsync.lock
log file = /var/log/rsyncd.log
[share]
path = /home/filetobackup/
ignore errors
read only = yes
list = yes
auth users = username
secrets file = /etc/password.pas
/etc/password.pas(权限400)
username:password
Server B:
backup.sh
#!/bin/bash
DATE=`date +%w`
/usr/bin/rsync -vzrtopg --progress --delete --password-file=/root/script/password.pas username@ServerA_IP::share /home/backuppath >/root/logs/rsync.$DATE
/root/script/password.pas(权限400)
password
ServerB周一到周五凌晨1点执行脚本定时同步
Crontab：
0 1 * * 2-6 /root/script/backup.sh
