SSH and Remote Access | Notes for Linux

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Adding a New SSH Key to EC2

Add a new key pair to a running EC2 instance without losing existing access: key creation in AWS, local setup, public key extraction, and authorized_keys update.

Find Local Network IP

Find the IPv4 address of a Linux machine on the local network so another device can reach it over SSH.

Local SSH vs EC2: Reachability and Auth

Why a LAN device connects over SSH with just a password while EC2 needs a .pem key: reachability and authentication are separate, independent concerns.

Reach a Local Host by Name over SSH

Stop chasing a changing DHCP IP: reach a Linux host on the local network by a stable .local mDNS name or a DHCP reservation, and pick the right interface.

SSH into a Local Network Device

Connect from a Linux host to another device on the same local network over SSH, using a named host alias in ~/.ssh/config.

SSH into EC2 from Linux Host

Configure and connect to an AWS EC2 instance over SSH from a Linux host using a named host alias in ~/.ssh/config.

Transfer Files Between Machines with rsync over SSH

Move or copy folders between two Linux machines on the same network using SSH for the connection and rsync for the transfer, with a dry-run and verify step.