ssh

• ssh server config　

　/etc/ssh/sshd_config  

   PermitRootLogin yes 

Port 22

PasswordAuthentication yes  // set to no to enable key autentication only

• ssh client config

/etc/ssh/ssh_config 

• rsync 

sync two directory , and sync the deltar every time when it is runned 

rsync -avzh /root/rpmpkgs /tmp/backups/
or

 rsync -avzh rpmpkgs/ [email protected]:/home/