目标服务器（远程服务器）：CentOS 6

终端（本地服务器）：CentOS 7

任务：rsync命令远程备份数据

操作步骤如下：

[root@localhost sky9890]# yum install rsync -y

[root@localhost src]# rsync -av /usr/local/src/nginx-1.14.0.tar.gz  [email protected].***.***:/data/backup/

ssh: connect to host 113.195.***.*** port 22: Connection refused

rsync: connection unexpectedly closed (0 bytes received so far) [sender]

rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]

#远程服务器，查看22端口是否开放

[root@sky9896 backup]# vi  /etc/ssh/sshd_config

#Port 22              #取消注释

#AddressFamily any

#ListenAddress 0.0.0.0

#ListenAddress ::

[root@sky9896 backup]# service  sshd restart

[root@localhost src]# rsync -av /usr/local/src/nginx-1.14.0.tar.gz  [email protected].**.**:/data/backup/

The authenticity of host '113.195.***.*** (113.195.***.***)' can't be established.

RSA key fingerprint is SHA256:lWE2Av+l5rc79Ssh306995hDmU8T3mMF4+a1I0DtINg.

RSA key fingerprint is MD5:7e:bd:bf:1c:f3:9f:80:26:da:f1:4c:86:43:b3:6a:e3.

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

Warning: Permanently added '113.195.***.***' (RSA) to the list of known hosts.

[email protected].***.***'s password: 

Permission denied, please try again.  #拒绝登录，重新输入密码

[email protected].***.***'s password: 

sending incremental file list

nginx-1.14.0.tar.gz

sent 1,016,615 bytes  received 34 bytes  27,853.40 bytes/sec

total size is 1,016,272  speedup is 1.00

#测试结果

[root@sky9896 backup]# pwd

/data/backup

[root@sky9896 backup]# ll nginx-1.14.0.tar.gz 

-rw-r--r-- 1 root root 1016272 4月  17 23:35 nginx-1.14.0.tar.gz

rsync、scp命令都具有远程备份数据的作用。

scp:https://blog.51cto.com/sky9896/2120139