Must-See for Beginners! How to Master Large File Transfers Between Servers

File transfer between servers is a very important skill in web development and server administration. In particular, when dealing with large files, it is essential to know how to move files efficiently and securely.
In this article, we will clearly explain how to transfer large ZIP files between two hosting servers.

Using the scp Command

scp (Secure Copy) is a command used to securely transfer files using SSH (Secure Shell). This method is widely used for file transfers between servers.

Example:

scp username@IP-address-of-server-A:/path/to/your/file.zip /path/to/destination/

　
This command transfers a file from Server A to Server B. The meaning of each part is as follows.

• username:
  The username used to log in to Server A.
• IP-address-of-server-A:
  The IP address or hostname of the server where the file exists.
• /path/to/your/file.zip:
  The path of the ZIP file you want to transfer.
• /path/to/destination/:
  The path on Server B where the file will be saved.

Using the rsync Command

The rsync command is particularly useful when transferring large files or directories. It detects differences between files and transfers only the necessary parts, allowing efficient transfers.

Example:

rsync -avz username@IP-address-of-server-A:/path/to/your/file.zip /path/to/destination/

• The -avz option means transfer in archive mode, display detailed information, and enable compression.
• The other parameters are the same as the scp command.

Using the wget Command

The wget command is used to download files directly from a web server. With this command, you can download files by specifying a URL.

Example:

wget -P /path/to/destination/ https://xxxxxx.jp/xxxxx/blog.zip

• The -P option specifies the destination where the downloaded file will be saved.
• /path/to/destination/ is the directory where the downloaded file will be saved.
• https://xxxxxx.jp/xxxxx/blog.zip is the URL of the file to download.

Using the curl Command

The curl command is also used to download files from external servers. This command is multifunctional and flexible.

Example:

curl -o /path/to/destination/blog.zip https://xxxxxx.jp/xxxxx/blog.zip

• The -o option specifies the destination and filename for the downloaded file.
• /path/to/destination/blog.zip is the path and filename where the downloaded file will be saved.
• https://xxxxxx.jp/xxxxx/blog.zip is the URL of the file to download.

Important Points

When transferring large files between servers, please pay attention to the following points.

1. Security:
   Security is important for file transfers. When using scp or rsync, make sure that communication is securely performed through SSH (Secure Shell). To prevent unauthorized access, consider using public key authentication instead of passwords.
2. File Size and Bandwidth:
   When transferring large files, you need to consider the time required for the transfer and the network bandwidth. Choose the timing of the transfer appropriately and minimize the impact on other network activities.
3. Error Checking:
   Errors may occur during file transfer. When using the rsync command, you can verify file integrity after the transfer is complete. If an error occurs, retry the transfer or identify and resolve the cause of the problem.
4. File Overwriting:
   If there is a possibility of overwriting existing files, proceed carefully. If necessary, consider taking a backup before the transfer.

　
Keep these points in mind to perform safe and efficient file transfers between servers.

Summary

File transfer between servers is one of the fundamental skills for engineers. By mastering commands such as scp, rsync, wget, and curl, you can efficiently and securely move or download files. By learning how to use these commands, you will be able to handle file transfers in various scenarios.

　
*Please use this information at your own responsibility if you choose to refer to it.