SCP replicates data from one Linux server to another Linux server

The SCP is a shorthand for secure copy, a command for remotely copying files under Linux, and a similar command with CP, although the CP is only copied natively and cannot cross the server, and the SCP transfer is encrypted. may have a slight effect on the speed. When your server hard disk becomes read only, the SCP can help you move the files out. In addition, the SCP does not account for the resources, how much system load, at this point, rsync is far less than it. Although Rsync is a bit faster than SCP, rsync can cause hard disk I/O to be very high when there are too many small files, and the SCP basically does not affect the normal use of the system.

1. Command format:

SCP [parameter] [original path] [Target path]

2. Command function:

SCP is the abbreviation for secure copy, and SCP is a secure remote file Copy command under the Linux system based on SSH login. The SCP command for Linux allows you to copy files and directories between Linux servers.

3. Command parameters:

-1 Mandatory SCP command using protocol SSH1

-2 Mandatory SCP command using protocol SSH2

-4 Force SCP command to use only IPV4 addressing

-6 Force SCP command to use only IPV6 addressing

-B Use Batch mode (transfer password or phrase is not asked during transfer)

-C allows compression. (Pass the-c flag to SSH to turn on the compression function)

-P retains the original file's modification time, access time, and access rights.

-Q does not display the transfer progress bar.

-R recursively replicates the entire directory.

-V verbose displays the output. SCP and SSH (1) will display debugging information for the entire process. This information is used to debug connections, authentication, and configuration issues.

-C cipher encrypts the data transfer with cipher, and this option is passed directly to SSH.

-F ssh_config Specifies an alternative SSH configuration file that is passed directly to SSH.

-I identity_file the key file used to read the transfer from the specified file, and this parameter is passed directly to SSH.

The-L limit limits the bandwidth that the user can use, in kbit/s.

-O ssh_option If you are accustomed to using the parameter passing method in Ssh_config (5),

-P Port Note is uppercase P, port is the port number specified for data transfer

-S program specifies the programs that are used to encrypt the transmission. This program must be able to understand the options for SSH (1).

4. Usage examples:

An overview of the practical application of SCP commands:

Copy from the local server to the remote server:

(1) Copying files:

Command format:

SCP Local_file [Email Protected]_ip:remote_folder

Or

SCP Local_file [Email protected]_ip:remote_file

Or

SCP Local_file Remote_ip:remote_folder

Or

SCP Local_file Remote_ip:remote_file

1th, 2 Specify the user name, the command executes after the user password is entered, the 1th only specifies the remote directory, the file name is unchanged, 2nd specified the file name

3rd, 4 does not specify a user name, the command executes after entering the user name and password, the 3rd only specifies the remote directory, the file name is not changed, 4th specified the file name

(2) Copy directory:

Command format:

Scp-r Local_folder [Email protected]_ip:remote_folder

Or

Scp-r Local_folder Remote_ip:remote_folder

The 1th one specifies the user name, the command executes after the need to enter the user password;

The 2nd does not specify a user name, the command will need to enter the user name and password after execution;

Copy from remote server to local server:

The SCP command from remote Copy to local is identical to the one above, as long as the 2 parameters are swapped sequentially after the command copied locally to the remote.

--------------------------------------------------------------------------------------------------------------- -------------

Example 1: Copying files from a distance to a local directory

Command:

SCP [Email protected]:/opt/soft/nginx-0.5.38.tar.gz/opt/soft/

Description

Download nginx-0.5.38.tar.gz files from the/opt/soft/directory on the 192.168.120.204 machine to the local/opt/soft/directory

Example 2: Copying from a distance to a local

Command:

scp-r [Email protected]:/opt/soft/mongodb/opt/soft/

Description

Download the MongoDB directory to the local/opt/soft/directory from the/opt/soft/on the 192.168.120.204 machine.

Example 3: Uploading a local file to a remote machine specified directory

Command:

scp/opt/soft/nginx-0.5.38.tar.gz [Email protected]:/opt/soft/scptest

Description

Copy the file nginx-0.5.38.tar.gz from the local opt/soft/directory to the Opt/soft/scptest directory of the remote machine 192.168.120.204

Example 4: Uploading a local directory to a remote machine-specified directory

Command:

Scp-r/opt/soft/mongodb [Email protected]:/opt/soft/scptest

Output:

SCP replicates data from one Linux server to another Linux server