SFTP (Secure File Transfer Protocol) is a secure method for transferring files over SSH (Secure Shell). This guide will show you how to install and use SFTP on Linux servers.
Step 1: Install the SSH Server
- SFTP is part of the SSH server package. To install it, you need to ensure that the SSH server (OpenSSH) is installed on your server. Use the following commands to install and start the SSH server:
sudo apt update
sudo apt install openssh-server -y
sudo systemctl start ssh
sudo systemctl enable ssh
Check the status of the SSH server to make sure it is running:
sudo systemctl status ssh
Step 2: Configure SSH for SFTP
- By default, SFTP should be enabled if the SSH server is running. However, you may want to configure specific settings for SFTP access. Edit the SSH configuration file:
sudo nano /etc/ssh/sshd_config
Ensure the following lines are present in the configuration file. If they are commented out, uncomment them:
# Allow SFTP
Subsystem sftp /usr/lib/openssh/sftp-server
To restrict SFTP users to their home directories, you can add the following lines at the end of the file:
Match Group sftpusers
ChrootDirectory %h
ForceCommand internal-sftp
AllowTcpForwarding no
X11Forwarding no
After making changes, restart the SSH server to apply them:
sudo systemctl restart ssh
Step 3: Create and Configure SFTP Users
- Create a new user for SFTP access:
sudo adduser sftpuser
- Add the user to the SFTP group if you configured a restricted access group:
sudo groupadd sftpusers
sudo usermod -aG sftpusers sftpuser
- Create the necessary directories and set permissions:
sudo mkdir -p /home/sftpuser/uploads
sudo chown root:root /home/sftpuser
sudo chmod 755 /home/sftpuser
sudo chown sftpuser:sftpusers /home/sftpuser/uploads
Step 4: Connect to the Server Using SFTP
- To connect to the server using SFTP, use an SFTP client or the command line. From a local machine, run:
sftp sftpuser@your-server-ip
Replace sftpuser with your SFTP username and your-server-ip with your server’s IP address. You will be prompted to enter the user’s password.
- Once connected, you can use SFTP commands to manage files. Some basic commands include:
# List files in the current directory
ls
# Change directory on the server
cd /path/to/directory
# Upload a file from local to server
put localfile
# Download a file from server to local
get remotefile
# Exit SFTP session
exit
Step 5: Secure Your SFTP Server
- For added security, consider the following:
- Use SSH key pairs for authentication instead of passwords.
- Regularly update your system and SSH server software.
- Restrict SFTP users to specific directories and limit their access as needed.
Conclusion
You have successfully installed and configured SFTP on your Linux server. You can now securely transfer files to and from your server using SFTP. Ensure to follow best practices for security to protect your server and data.
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