SSH Tunnels
SSH tunnels, also known as SSH port forwarding, are a feature of the SSH protocol that creates encrypted connections between a local and remote machine, allowing secure data transmission through an intermediate network. They work by forwarding network traffic from one port to another over an SSH connection, effectively creating a secure 'tunnel' for applications that lack native encryption. This enables secure access to services like databases, web servers, or internal networks that would otherwise be exposed or inaccessible.
Developers should learn SSH tunnels when they need to securely access remote resources, such as connecting to a database behind a firewall, testing web applications on a staging server, or bypassing network restrictions in development environments. They are particularly useful for DevOps tasks, remote debugging, and accessing internal services in cloud or corporate networks without exposing them to the public internet, providing a lightweight and secure alternative to VPNs for specific use cases.