Ssh
SSH usage, key management, config files, tunneling, and hardening.
ssh-copy-id Command: Copy SSH Keys to a Remote Server
How to use the ssh-copy-id command to copy your SSH public key to a remote server and set up passwordless login. Covers options, a manual fallback, and common errors.
SSH Permission Denied (publickey): Causes and Fixes
How to troubleshoot the SSH "Permission denied (publickey)" error in Linux. Covers file permissions, missing keys, SELinux, SSH agent issues, and server-side debugging.
How to Use SFTP Command to Transfer Files
Use the sftp command to connect over SSH, upload and download files, transfer directories, run batch jobs, and troubleshoot common errors.
SSH Hardening Guide: Best Practices for Linux Servers
SSH hardening best practices for Linux servers, including sshd_config checks, key-only logins, root login restrictions, firewall rules, timeouts, and Fail2Ban.
Initial Server Setup on Ubuntu 26.04
Prepare a new Ubuntu 26.04 server with a sudo user, SSH key authentication, UFW firewall rules, a hostname, timezone settings, and system updates.
scp Command in Linux: Secure File Transfer Examples
SCP copies files securely between local and remote hosts over SSH. This guide covers syntax, common options, and practical examples for everyday file transfers.
How to Enable SSH on Raspberry Pi
Enable SSH on Raspberry Pi with Raspberry Pi Imager, the headless ssh file method, raspi-config, or systemctl. Updated for current Raspberry Pi OS releases.
How to Change the SSH Port in Linux
Change the default SSH port 22 by editing sshd_config, adjusting the firewall, and reloading the SSH service on Linux.
SSH Tunnel: Local, Remote, and Dynamic Port Forwarding
SSH tunneling (port forwarding) encrypts and relays TCP traffic through a secure SSH connection. This guide covers local, remote, and dynamic port forwarding with practical examples.
How to Use SSHFS to Mount Remote Directories over SSH
SSHFS lets you mount a remote directory over SSH and browse it like a local filesystem. This guide covers installation on Linux, macOS, and Windows, mounting with options, persistent fstab mounts, and troubleshooting.
How to Enable SSH on Ubuntu
Enable SSH on Ubuntu by installing OpenSSH Server, starting the ssh service, allowing it through UFW, and connecting remotely from Linux, macOS, or Windows.
Using the SSH Config File
Set up the SSH client config file to manage multiple remote connections with custom hostnames, users, ports, keys, and jump hosts — all without long command-line flags.
How to Set Up SFTP Chroot Jail
Step-by-step instructions for setting up an SFTP Chroot Jail on Linux to restrict users to their home directories using OpenSSH.
How to Change the SFTP Port
SFTP runs on SSH port 22 by default. This guide explains how to change the SFTP port on Linux, configure your firewall for the new port, and connect using the updated port number.
ssh Command in Linux: Connect to Remote Servers
Connect to remote servers securely using the ssh command. Covers basic connections, key-based authentication, SSH config files, running remote commands, port forwarding, and troubleshooting.
Generate SSH Keys on Windows with PuTTYgen
This tutorial explains how to generate SSH keys on Windows with PuTTYgen. We will also show you how to set up an SSH key-based authentication and connect to your remote Linux servers without entering a password.
How to Set Up SSH Keys on Ubuntu 20.04
This article explains how to generate SSH keys on Ubuntu 20.04 systems. We'll also show you how to set up an SSH key-based authentication and connect to remote Linux servers without entering a password.
