Harssh harssh

Increasing LVM Disk Space (Ubuntu)

Increase live Ubuntu server disk space (requires LVM) without any downtime.

All of the commands below need to be executed as root user.

Create a new partition using unallocated space.

First we'll need to determine exactly which disk was added or had its size increased.

Optimizing Rust container builds

I'm a Rust newbie, and one of the things that I've found frustrating is that the default docker build experience is extremely slow. As it downloads crates, then dependencies, then finally my app - I often get distracted, start doing something else, then come back several minutes later and forget what I was doing

Recently, I had the idea to make it a little better by combining multistage builds with some of the amazing features from BuildKit. Specifically, cache mounts, which let a build container cache directories for compilers & package managers. Here's a quick annotated before & after from a real app I encountered.

Before

This is a standard enough multistage Dockerfile. Nothing seemingly terrible or great here - just a normal build stage, and a smaller runtime stage.

	Feature: Facebook Connect

	Scenario: Sign in with Facebook
	When I go to the sign in page
	And I press "Sign in with Facebook"
	And Facebook returns uid:"123", nickname:"chunky.bacon", first_name:"Chunky", last_name:"Bacon", email:"[email protected]"
	Then I should see "Your mysite account was successfully created"

	...

	gem 'devise',
	:git => 'https://github.com/plataformatec/devise.git',
	:branch => 'omniauth'

	gem 'oa-oauth', :require => 'omniauth/oauth'

	...

	# in spec/support/omniauth_macros.rb
	module OmniauthMacros
	def mock_auth_hash
	# The mock_auth configuration allows you to set per-provider (or default)
	# authentication hashes to return during integration testing.
	OmniAuth.config.mock_auth[:twitter] = {
	'provider' => 'twitter',
	'uid' => '123545',
	'user_info' => {
	'name' => 'mockuser',

	module Devise
	module Models
	# Registerable is responsible for everything related to registering a new
	# resource (ie user sign up).
	module Registerable
	extend ActiveSupport::Concern

	module ClassMethods
	# A convenience method that receives both parameters and session to
	# initialize a user. This can be used by OAuth, for example, to send

	# requires :password_reset_token and :password_reset_token_expires_at fields
	module PasswordResetable
	extend ActiveSupport::Concern

	included do
	before_validation do
	if password_reset_token_expires_at && password_reset_expires_at.past?
	expire_password_reset!
	end
	end

	require 'benchmark'
	require 'etc'

	Ractor.new { :warmup } if defined?(Ractor)

	def fibonacci(n)
	return n if (0..1).include? n

	fibonacci(n - 1) + fibonacci(n - 2)
	end

	require 'fog'

	username = 'testuser'
	bucket = 'uniquebucketname1234'

	aws_credentials = {
	:aws_access_key_id => 'YOUR-ACCESS-KEY-ID',
	:aws_secret_access_key => 'YOUR-SECRET-ACCESS-KEY'
	}

	#resides in app/models/connectors/
	class Connectors::Aws
	attr_reader :aws_access_key_id, :aws_secret_access_key, :aws_security_token, :expires_at

	def initialize
	if ENV.has_key?('AWS_SECURITY_TOKEN') #localhost
	@aws_access_key_id = ENV['AWS_ACCESS_KEY_ID']
	@aws_secret_access_key = ENV['AWS_SECRET_ACCESS_KEY']
	@aws_security_token = ENV['AWS_SECURITY_TOKEN']
	@expires_at = Time.now + 10.hours