Daniel Flores devniel

How to install Ubuntu with LUKS Encryption on LVM

My work requires us to have full-disk encryption, so these are the steps I use.

The basic idea is to create a LUKS-encrypted partition which is used as an LVM Physical Volume.

The GRUB boot partition isn't encrypted, but everything else is.

These steps tested and working on 22.04 (jammy) and 20.04 (focal).

Introduction

To reset your terminal, you can call reset from your shell, which is generally included with the target operating systems.

If you want to reset when you are not at a shell prompt (i.e., inside some other application), we can send an escape sequence in another way.

As an example, we can send a special escape sequence to the Nth tty:

echo -e "\ec" &gt; /dev/pts/$N

You should not use the Open SSH client that comes with Git for Windows. Instead, Windows 10 has its own implementation of Open SSH that is integrated with the system. To achieve this:

Start the ssh-agent from Windows Services:

Type Services in the Start Menu or Win+R and then type services.msc to launch the Services window;
Find the OpenSSH Authentication Agent in the list and double click on it;
In the OpenSSH Authentication Agent Properties window that appears, choose Automatic from the Startup type: dropdown and click Start from Service status:. Make sure it now says Service status: Running.

Configure Git to use the Windows 10 implementation of OpenSSH by issuing the following command in Powershell:

git config --global core.sshCommand C:/Windows/System32/OpenSSH/ssh.exe

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

Neo4j Tutorial

Fundamentals

Store any kind of data using the following graph concepts:

Node: Graph data records
Relationship: Connect nodes (has direction and a type)
Property: Stores data in key-value pair in nodes and relationships
Label: Groups nodes and relationships (optional)

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

	console.log(1);
	(_ => console.log(2))();
	eval('console.log(3);');
	console.log.call(null, 4);
	console.log.apply(null, [5]);
	new Function('console.log(6)')();
	Reflect.apply(console.log, null, [7])
	Reflect.construct(function(){console.log(8)}, []);
	Function.prototype.apply.call(console.log, null, [9]);
	Function.prototype.call.call(console.log, null, 10);

	cd
	git clone git://github.com/sstephenson/rbenv.git .rbenv
	echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.zshrc
	echo 'eval "$(rbenv init -)"' >> ~/.zshrc
	git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
	echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.zshrc
	source ~/.zshrc
	sudo apt-get install -y libssl-dev libreadline-dev zlib1g-dev
	rbenv install -v 2.3.1
	rbenv global 2.3.1

	/// Helper for EQCSS Element Queries `@element`
	///
	/// @author Jason Featheringham
	/// @link https://gist.github.com/thejase/d2107285b6e10315dd6bc055115647fe Code source
	/// @link http://elementqueries.com/ Plugin to parse EQCSS
	/// @link https://gist.github.com/tomhodgins/6237039fa07c2e4b7acd1c8b0f9549a9 EQCSS syntax
	///
	/// @param {String} $scope (&) - Optional scope. Defaults to current context
	/// @param {List} $conditions (()) - 1+ of Maps of EQCSS conditions
	/// @content rules to enclose in element query

	cd ~/hadoop/sbin/

	# save old scripts
	mv start-dfs.sh start-dfs.sh.orig
	mv start-yarn.sh start-yarn.sh.orig
	mv stop-dfs.sh stop-dfs.sh.orig
	mv stop-yarn.sh stop-yarn.sh.orig

	touch start-dfs.sh && chmod +x start-dfs.sh
	touch start-yarn.sh && chmod +x start-yarn.sh