linux远程文件同步

1.先准备环境

sudo apt-get install ssh

ssh-keygen  //注意，file与passphrase均无需输入    Generating public/private rsa key pair.  Enter file in which to save the key (/home/user1/.ssh/id_rsa):   /home/user1/.ssh/id_rsa already exists.  Overwrite (y/n)?   user1@localhost:~$ ssh-keygen  Generating public/private rsa key pair.  Enter file in which to save the key (/home/user1/.ssh/id_rsa):   /home/user1/.ssh/id_rsa already exists.  Overwrite (y/n)? y  Enter passphrase (empty for no passphrase):   Enter same passphrase again:   Your identification has been saved in /home/user1/.ssh/id_rsa.  Your public key has been saved in /home/user1/.ssh/id_rsa.pub.  The key fingerprint is:  ed:89:09:e0:5b:44:d0:78:e3:a2:a2:55:5c:15:43:e2 user1@localhost  The key's randomart image is:  +--[ RSA 2048]----+  |    .+oo=.       |  |    .o=. .       |  |   ..+E.         |  |   .+o.  .       |  |   o..o S .      |  |. o  o . + .     |  |.o  .   o o      |  |.                |  |                 |  +-----------------+

3.上传凭证

scp ~/.ssh/id_rsa.pub user1@ip:/home/user1/.ssh/authorized_keys    若远端报无此目录异常，可先在远端机器执行ssh-keygen命令产生，Copy成功信息：  id_rsa.pub                                    100%  400     0.4KB/s   00:00    

4.无密码连接

ssh your-ip    //若出现此信息：  Agent admitted failure to sign using the key.  //执行：  ssh-add   ~/.ssh/id_rsa    //连接成功信息，注意命令提示已经切换到远端：  Last login: Sat Oct 25 09:57:29 2014 from 192.16.1.100  [user1@centos ~]$ 
  //设定其文件权限   chmod 600 ~/.ssh/authorized_keys 
  

5.文件同步

rsync -a --delete/opt/data/ user1@192.16.1.100:/opt/data/