kushaldas/lymworkbook

The workbook for LYM book

Work for the LYM book

This is a fresh workbook for the LYM readers. This is using Vagrant to build up the vm, you can actually use it in a normal vm too. Make sure that you have a vagrant user and you can ssh into the vm from your normal work computer. Also, this user should be able to do sudo without password.

TODO (Add steps for the above mentioned things)

How to use the tool?

First you will get the vm ready.

vagrant up
vagrant ssh workbook

Next, to create any of the problems, type sudo lymsetup PROMBLEM_NAME command.

sudo lymsetup copypaste

To verify your work, type sudo lymverify PROBLEM_NAME command.

sudo lymverify copypaste

If you managed to solve the problem, you will see the following output.

Success. Now try next problem.

Template of a new problem

# A small paragraph explaining the problem.
# This has to be updated if there is any change in the
# problem statement.

import os
import sys
from .utils import system, success, fail, find_path_data

def setup():
    "Setup problemname"
    pass  # Nothing to do.

def verify():
    "Verify problemname"
    pass
    # if everything okay, then
    success()
    # If something is not correct then
    fail("You failed to setup xyz")

Fill in the setup and verify functions. Remember to use black on the code before you submit a PR.

License: GPLv3+

lymworkbook's Issues

Change the system's timezone to the same of SFO, USA

problem name: timezonechange

Disable password authentication for the root account - be careful not to lose access.

If you logged in to your root account using a password, then password authentication is enabled for SSH.
Hint: You should use SSH key authentication.

Install rust

The user will install Rust programming language following steps from https://rustup.rs, and then update the PATH variable in such a way so that rustc is available.

To verify

lymverify installrust

Remember that the verification step is missing sudo command.

Setup ssh access for a regular user. Use ssh key authentication.

Add a copy of your local public key to the new user’s ~/.ssh/authorized_keys file to log in successfully.

Disabling parts of SystemD for a simpler system

There are parts of SystemD that don't make sense in many contexts, and frankly get in the way of trying to do more useful things:

• systemd-timesyncd
• systemd-resolved
• etc

There are better programs available, a discussion of why these are there, why switching makes sense, and the steps to do the switch

Use 1.1.1.1 as DNS resolver

Create a new RSA ssh key for the vagrant user

Create a new RSA ssh key for the vagrant user. Make sure that it is protected with a passphrase.

Which command to use to find out how long the computer is running?

lymverify howlongrunning
Enter the command: 

For the verify part, take the user input, and then see if it is the correct command or not.

Add a new user with wheel group

Add a new user powerful with wheel as the group for the user.

problemname: usergroup

Setting up a basic firewall

Firewalls are used to make sure only certain connections to specific services are allowed. In this task you have to install and use the UFW firewall to help set firewall policies and manage exceptions.

Find out the IP of dgplug.org

Find out the IP of dgplug.org and put into /tmp/ip_dgplug.txt file.

Granting administrative privileges to a user

You have already created a new user account with regular account privileges. In order to do administrative tasks with it, you need to set up what is known as superuser or root privileges for our normal account. This will allow this user to run commands with administrative privileges by putting the word sudo before the command.