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Lesson_13.md

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Lesson 13 Unix Network

Ifconfig

  • ifconfig is a command that displays the network configuration of the machine
  • it is used to configure the network interface
  • it is now deprecated and replaced by ip!
  • why is it still being taught???

SSH

  • SSH is a protocol that allows you to connect to a remote machine and execute commands on it
  • it is the replacement for telnet, which is insecure
  • its the gold standard for remote access to a machine, including port forwarding, X11 forwarding, etc
  • its great!

SSH Keys

SSH is often used with keys, which are a way of authenticating a user without having to enter a password. It is a public/private key pair, where the private key is kept secret and the public key is shared with the server. sshkeys are nowerdays used for many different utilities which need a simple way to authenticate a user, like git, cloud services, etc.

By default the keys are stored in ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub to generate a new key pair, use the command ssh-keygen

To copy the public key to a remote machine, use the command ssh-copy-id

ssh-keygen 
ssh-copy-id -i ~/.ssh/id_rsa.pub user@host

SSH tools

SCP

  • SCP is a tool for copying files between machines
  • it simply copies the file from one machine to another over an encrypted connection

SSHFS

  • SSHFS is a tool for mounting a remote filesystem over ssh
  • it allows you to access files on a remote machine as if they were local

Sockets

  • like everything else in unix, sockets are files
  • they are used to communicate between processes and machines