rsync是一個實用的同步工具

需求：A目錄的數據實時更新，將A的數據拷貝到B目錄，每隔一小時拷貝一次

使用cp命令：

1 在A目錄中找出最近1小時新增的內容拷貝到B（比較麻煩）

2 直接拷貝A目錄的所有內容將B目錄覆蓋（浪費時間和磁盤IO）

cp命令不適用

rsync可以實現增量更新（rsync只會同步新增和有內容變更的文件）；

支持遠程同步（將數據同步到不同ip的另一臺機器上）；

安裝rsync

[root@hyc-01-01 ~]# yum install -y rsync

將passwd同步到tmp目錄下並改名為1.txt

[root@hyc-01-01 ~]# rsync -av /etc/passwd /tmp/1.txt

sending incremental file list

passwd

sent 938 bytes received 35 bytes 1,946.00 bytes/sec

total size is 846 speedup is 0.87

-a 包含多個選項

-v 可視化，可以看到拷貝的過程

將文件同步到遠程機器的特定目錄

[root@hyc-01-01 ~]# rsync -av /etc/passwd root@192.168.31.128:/tmp/1234.txt

The authenticity of host '192.168.31.128 (192.168.31.128)' can't be established.

ECDSA key fingerprint is SHA256:0SErfGbbc3AfFcxC92Tav9X/T/bOn8wfnvum/wnw5Xs.

ECDSA key fingerprint is MD5:b7:d4:e4:4a:4a:33:29:99:1a:2e:45:94:d9:40:17:fb.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.31.128' (ECDSA) to the list of known hosts.

[email protected]'s password:

sending incremental file list

passwd

sent 938 bytes received 35 bytes 67.10 bytes/sec

total size is 846 speedup is 0.87

其中root@可以省略，此時使用執行當前命令的用戶作為登錄用戶

將遠程機器的某文件拷貝到當前機器某個目錄下

[root@hyc-01-01 ~]# rsync -av [email protected]:/etc/passwd /tmp/passwddd

[email protected]'s password:

receiving incremental file list

passwd

sent 43 bytes received 938 bytes 130.80 bytes/sec

total size is 846 speedup is 0.86

[root@hyc-01-01 ~]# ls /tmp/passwddd

/tmp/passwddd

7.18 10.28-10.31