用rsync 命令实现linux 跨服务器差分备份，不需要输入密码

测试：本地机器：10.100.2.51 远程机器：10.100.2.50

目的：

测试环境：

把本地服务器的test2文件夹的东西移动到远程服务器的test2里面

实现方法：

1， [本地机器] 用ssh-keygen生成密钥

[root@SHTFMGDBS01 ~]# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

/root/.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 /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

*********************************** root@S*********

The key's randomart image is:

+--[ RSA 2048]----+

| .o+.o=+*|

| ..o. = |

| .o ...+|

| . .o . oo=|

| S. = |

| .E o |

| . |

| |

| |

+-----------------+

2，[本地机器] 将本地的公钥传送到远端机器root帐户的.ssh目录下

scp id_rsa.pub root@10.100.2.50:server_1

#mv server_1 .ssh/

cd .ssh/

#cat server_1 >> authorized_keys

3，[本地机器] 创建同期shell

vim diff_backup.sh

测试环境

#!/bin/sh

echo 開始：$(date +%Y%m%d%H%M%S) >> ./filebklog

rsync -auv -e"ssh -i /root/.ssh/id_rsa" ./test2/ root@10.100.2.50:/test2/

echo 完了：$(date +%Y%m%d%H%M%S) >> ./filebklog

4、报错对应

如果提示0755错误

Permissions 0755 for ‘/etc/ssh/id_rsa’ are too open.

执行下面的语句

chmod 0644 *

chmod 0600 id_rsa

5，创建任务

设置定时执行任务：

crontab -e

测试环境

每隔一分钟执行一次/root/diff_backup.sh

*/1 * * * * /root/diff_backup.sh

每天凌晨3点执行/root/diff_backup.sh

0 3 * * * /root/diff_backup.sh

esc

：

wq

重启定时命令：

service crond restart

查看当前用户的任务

crontab -l

查看执行log，

cat filebklog

查看系统log

tail -n 50 ~/../var/spool/mail/root

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