Installing OpenSSH Server
To install the OpenSSH server, run the following command:
sudo apt install openssh-server
SSH Configuration Files
- Server Configuration:
/etc/ssh/sshd_config - Client Configuration:
/etc/ssh/ssh_config
Managing SSH with systemctl
Use the following commands to manage the SSH service:
sudo systemctl start sshd # Start the SSH service
sudo systemctl status sshd # Check the status of the SSH service
sudo systemctl stop sshd # Stop the SSH service
sudo systemctl restart sshd # Restart the SSH service
sudo systemctl enable sshd # Enable SSH to start on boot
sudo systemctl disable sshd # Disable SSH from starting on boot
Troubleshooting Common Issues
Permission Denied (root@host)
If you encounter a “Permission denied” error when trying to log in as root, ensure that root login is permitted in the /etc/ssh/sshd_config file. Update the configuration as follows:
PermitRootLogin yes
After making changes, restart the SSH service:
sudo systemctl restart sshd