Lesson 1: First Steps

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Overview

_images/Tux.png

Vocabulary

A 10,000ft view of the world
General Topics:
  • Software: A program that runs on a computer.
  • Operating System: Computer software that manages other software.
  • GNU/Linux: A free Operating System.
  • Computer Security: Like physical security but harder to solve with a baseball bat.
  • Virtual Machine: A computer emulated in software.

Vocabulary

Development:
  • Version Control: A way to track changes and contributions to a project.
  • Continuous Integration: Releasing updates continuously.
Buzzwords:
  • FOSS: Free (and Libre) Open Source Software. Free as in Speech, not Free as in Pizza (but that too usually).
  • 'The Cloud': Computers somewhere else.
  • Containers: Not virtual machines, but basically virtual machines.

TODO: What Vocabulary Do You Know?

What other vocabulary can you think of related to DevOps?

What about Silicon Valley, Programming, System Administration, etc?

Note

This is a TODO. It's basically an exercise or activity but with a cheeky name. Try them out if you don't feel confident in a topic.

Notation

Notation

#! /usr/bin/env python
# This is a code block.
# Most of the time you can copy this code and run it exactly as is.
# It should be clear Where it 'goes' and how to run it based on context.
print('Hello world!')
$ echo Hello World    # Copy the text after `$` into your termianal and press enter.

TODO: Reading Examples

Trick question: how would you read this
#!/bin/python
dogs = ['$BREED_ONE', '$BREED_TWO', '$BREED_THREE']
for breed in dogs:
    print(breed)

Answer: Reading Examples

Replace the $BREED_N with actual dog breeds.

#!/bin/python
dogs = ['corgie', 'pug', 'french bulldog']
for breed in dogs:
    print(breed)

Getting Setup on Linux

Tux Linux Logo

Lecture Setup

  1. Get login credentials from your lecturer.
    • You will be provided a username, password, host, and port.
Linux/Mac:
  1. Open a terminal and verify you have ssh installed by entering the command ssh --version.
  2. Run ssh -p <port> <username>@<host> and enter the password when prompted (it will hide your password in the terminal).

Lecture Setup

Windows:
  1. Install an SSH Client (install Putty)

  2. Log into your remote Linux environment using the credentials given to you.

    1. Under Host Name (or IP address) enter <user>@<host>, under Port enter <port>.
    2. You will be prompted for your password in new window, it will hide the password as you type it.

Home Setup

We suggest you install Vagrant, a tool which makes it easy to run and acquire Virtual Machines.

You may also need to install VirtualBox, a tool necessary for Vagrant to function.

Vagrant logo

TODO: Change Your Password!

Challenge Change your password on your Linux machine.
$ passwd
Changing password for user <user>.
Changing password for <user>.
(current) UNIX password: # Enter old password, hidden
New password:   # Enter new password, also hidden
Retype new password:
passwd: all authentication tokens updated successfully.

Don't forget: when you login next time, use the new password you just set.

Further Reading