How to transfer files directly between two servers in Linux

scp is the abbreviation of secure copy, which is a secure remote file copy command based on ssh login under the Linux system. scp is encrypted, rcp is unencrypted, scp is an enhanced version of rcp.

Because scp transmission is encrypted, it may slightly affect the speed. In addition, scp does not occupy resources and does not increase the system load much. In this regard, rsync is far behind it. Although rsync is faster than scp, when there are many small files, rsync will cause very high hard disk I/O, while scp basically does not affect the normal use of the system.

Scenario: Suppose I have two servers now (the public network IP and the intranet IP here can be transmitted to each other. Of course, it is faster to use the intranet IP to transmit each other. **The public network IP is inconvenient to publish)

Sessions1: 47.95.208.2**
内网：172.17.31.174
User:root
Sessions2: 47.94.92.2**
内网：172.17.31.173
User:root

Two methods commonly used here:

1. When transferring files from one remote server to another (you want to transfer files to others)

Now we log in to 172.17 .31.173 This server wants to pass the current test.mysql to others (172.17.31.174 this server)

hostname -i You can view the current ip

Command:

scp test.sql root@172.17.31.174:/data/

If the two servers are not directly configured for password-free login, it is required enter password.

I use the intranet IP here, so the transfer is faster. If you use the public network, it will be much slower (personal test)

Transfer completed!

Check it on the server with IP suffix 174:

Appendix:

scp [optional parameter] file_source file_target

Commonly used -r,-C

-1： 强制scp命令使用协议ssh2
-2： 强制scp命令使用协议ssh3
-4： 强制scp命令只使用IPv4寻址
-6： 强制scp命令只使用IPv6寻址
-B： 使用批处理模式（传输过程中不询问传输口令或短语）
-C： 允许压缩。（将-C标志传递给ssh，从而打开压缩功能）
-p： 保留原文件的修改时间，访问时间和访问权限。
-q： 不显示传输进度条。
-r： 递归复制整个目录。
-v： 详细方式显示输出。scp和ssh(1)会显示出整个过程的调试信息。这些信息用于调试连接，验证和配置问题。
-c cipher：        以cipher将数据传输进行加密，这个选项将直接传递给ssh。
-F ssh_config：    指定一个替代的ssh配置文件，此参数直接传递给ssh。
-i identity_file： 从指定文件中读取传输时使用的密钥文件，此参数直接传递给ssh。
-l limit：         限定用户所能使用的带宽，以Kbit/s为单位。
-o ssh_option：    如果习惯于使用ssh_config(5)中的参数传递方式，
-P port：          注意是大写的P, port是指定数据传输用到的端口号
-S program：       指定加密传输时所使用的程序。此程序必须能够理解ssh(1)的选项。

2. On the local server, get files from another server (you want to get files from others)

Create a new file in the 173 service data directory A local_test is used to test the folder (testing the -r parameter)

and then go to the local server (*174 this one). The local server here is relative.

Command:

scp -r root@172.17.31.173:/data/local_test /data/

To copy the folder, you need to add -r after scp

Vernacular description:

scp root@远程的服务器Ip:文件路径 存放路径

Copy on the remote server to the local server (log in to the remote server and transfer files to others (local))

Command:

scp test.sql root@172.17.31.174:/data/

Requires someone else’s (local) IP address to transfer

Log in to the local server and get the file from the remote server (take the initiative to get the file from someone else)

Command:

scp -r root@172.17.31.173:/data/local_test /data/

Requires a remote ip (other people's) address to get the file

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