CentOS5 + rsync 同步2台服务器的文件

Always use rsync over ssh

Since rsync does not provide any security while transferring data it is recommended that you use rsync over ssh . This allows a secure remote connection. Now let us see some examples of rsync.

rsync command common options

--delete : delete files that don't exist on sender (system) -v : Verbose (try -vv for more detailed information) -e "ssh options" : specify the ssh as remote shell -a : archive mode -r : recurse into directories -z : compress file data

Task : Copy file from a local computer to a remote server

Copy file from /www/backup.tar.gz to a remote server called openbsd.nixcraft.in

$ rsync -v -e ssh /www/backup.tar.gz jerry@openbsd.nixcraft.in:~

Output:

Password: 
sent 19099 bytes received 36 bytes 1093.43 bytes/sec 
total size is 19014 speedup is 0.99

Please note that symbol ~ indicate the users home directory (/home/jerry).

Task : Copy file from a remote server to a local computer

Copy file /home/jerry/webroot.txt from a remote server openbsd.nixcraft.in to a local computer /tmp directory:

$ rsync -v -e ssh jerry@openbsd.nixcraft.in:~/webroot.txt /tmp

Password

Task: Synchronize a local directory with a remote directory

$ rsync -r -a -v -e "ssh -l jerry" --delete openbsd.nixcraft.in:/webroot/ /local/webroot

Task: Synchronize a remote directory with a local directory

$ rsync -r -a -v -e "ssh -l jerry" --delete /local/webroot openbsd.nixcraft.in:/webroot

Task: Synchronize a local directory with a remote rsync server

$ rsync -r -a -v --delete rsync://rsync.nixcraft.in/cvs /home/cvs

Task: Mirror a directory between my "old" and "new" web server/ftp

You can mirror a directory between my "old" (my.old.server.com) and "new" web server with the command (assuming that ssh keys are set for password less authentication)

$ rsync -zavrR --delete --links --rsh="ssh -l vivek" my.old.server.com:/home/lighttpd /home/lighttpd

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当需要把服务器上的文件复制到另外的机器上，可用rsync来同步文件。

一、服务器端配置：
# yum -y install xinetd

# vi /etc/xinetd.d/rsync
将如下代码

service rsync
{
disable = yes
socket_type = stream
wait = no
user = root
server = /usr/bin/rsync
server_args = –daemon
log_on_failure += USERID
}

中的 disable = yes 改成 disable = no

然后启动 xinetd

# /etc/init.d/xinetd start

注意：如果服务器上装有防火墙记得要打开端口，默认端口是873

# telnet 127.0.0.1 873

Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
# iptables -A INPUT -s 192.168.0.0/255.255.255.0 -p tcp -m tcp --dport 873 -j ACCEPT
# iptables -A INPUT -p tcp -m tcp --dport 873 -j DROP

# vi /etc/rsyncd.conf

[backup]
path = /www
auth users = admin