Created: 2023-07-16 09:58
Status: #concept
Subject: Web Development Network Engineering System Administration
Tags: Linux Shell CLI Unix Authentication openssh Network Protocol

SSH

It is a cryptographic Network Network Protocol for operating network services securely over an unsecured network.

  • with this, we can remotely use a CLI in a remote Linux machine.

Implementations

  • see openssh to connect to a remote server and create ssh-keygen key pairs for authentication.

Establishing an ssh Connection

$ ssh -v winfiru@192.168.1.17 # verbose logs option
Are you sure you want to continue connecting (yes/no/[fingerprint])?

Given a .key and .key.pub

Use the key as input to the ssh command via -i <YOUR_KEY>.key after making it have strict permissions.

chmod 600 ssh-key-2024-03-01.key                                     
ssh ubuntu@213.35.113.138 -i ~/ssh-key-2024-03-01.key

scp <src> <host>:<dest> "secure copy"

Copies a <src> file to another openssh <host> computer's <dest> Path.

  • similar to rsync, we can swap the <host>:<dest> and <src> to transfer from another host to our local machine.
  • it only performs a linear copy and does not incrementally track changes.

$ scp myfile.txt vbox@192.168.1.5:/remote/directory
$ scp vbox@192.168.1.5:/remote/directory/myfile.txt /local/directory
$ scp -r mydir vbox@192.168.1.5:/remote/directory # performs a recursive copy

References

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SSH
  • Establishing an ssh Connection
    1. Given a .key and .key.pub
    • scp : "secure copy"
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