Your production server is a thousand miles away. You still need to install software, read logs, restart the app, and chase down bugs on it. SSH is how you do all of that without your password travelling across the internet in plain text.
This video explains what SSH actually is, what happens during the handshake, and why key-based authentication beats passwords.
What you'll learn:
- Why remote access without encryption is unsafe
- What the SSH client, the encrypted tunnel, and the SSH server each do
- Port 22 and what it's for
- The four handshake stages: connection, host key verification, key exchange, authentication
- Host keys, and how your machine knows the server is the right server
- Session keys, and why the encryption key is never sent over the wire
- Password authentication vs key pairs, and why keys win
- What SSH gives you beyond a shell: SCP, SFTP, port forwarding, Git over SSH
- The myth that changing the default port is a security measure (it isn't)
Commands shown:
ssh deploy@203.0.113.42
ssh-keygen
ssh-copy-id
scp
sftp
If you deploy a Rails app, run background workers, or debug anything that lives on a machine you don't physically touch, this is the protocol underneath all of it.
#SSH #DevOps #Linux #BackendDevelopment #ServerAdministration #Networking #Encryption #SysAdmin #WebDevelopment #RubyOnRails
— #Astmation —
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