Marcin Kulik ku1ik

Channels Are Not Enough

... or Why Pipelining Is Not That Easy

Golang Concurrency Patterns for brave and smart.

Intro

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

Installing Arch Linux with Full Disk Encryption

If you're aiming for a seamless Arch Linux installation in UEFI mode, follow along as this guide will walk you through the process step by step. We'll be using LUKS (Linux Unified Key Setup) and LVM (Logical Volume Manager) partitions on LUKS to achieve full disk encryption.

Note: I have updated this doc for UEFI mode. For those with BIOS/MBR systems, you can refer to the previous version, but keep in mind that it might be outdated and no longer accurate.

If you're only interested in installing Linux and not setting up dual boot with Windows, feel free to skip the Windows-related sections.

	Your monthly notice to go through and disconnect unused applications across various services.

	Twitter: https://twitter.com/settings/applications
	Dropbox: https://www.dropbox.com/account/connected_apps
	Facebook: https://www.facebook.com/settings?tab=applications
	Google Apps: https://security.google.com/settings/security/permissions?pli=1
	Google Ads: http://www.google.com/ads/preferences
	Google Account: https://security.google.com/settings/security/secureaccount
	Foursquare: https://foursquare.com/settings/connections
	Instagram: https://instagram.com/accounts/manage_access

	#!/bin/sh
	#
	# Query a property from the terminal, e.g. background color.
	#
	# XTerm Operating System Commands
	# "ESC ] Ps;Pt ST"

	oldstty=$(stty -g)

	# What to query?

	defmodule HttpRequester do
	use GenServer

	def start_link(_) do
	GenServer.start_link(__MODULE__, nil, [])
	end

	def fetch(server, url) do
	# Don't use cast: http://blog.elixirsips.com/2014/07/16/errata-dont-use-cast-in-a-poolboy-transaction/
	timeout_ms = 10_000

	# On the phoenix node

	# if production mode
	MIX_ENV=prod PORT=4001 elixir --name phoenix@127.0.0.1 --cookie 123 --erl "-kernel inet_dist_listen_min 9001 inet_dist_listen_m 9001" -pa _build/prod/consolidated -S mix phoenix.server
	# if debug mode
	elixir --name phoenix@127.0.0.1 --cookie 123 --erl "-kernel inet_dist_listen_min 9001 inet_dist_listen_m 9001" -S mix phoenix.server

	# On the observing node
	# Terminal 1, start SSH tunnel
	ssh -N -L 9001:localhost:9001 -L 4369:localhost:4369 pi@192.168.1.31

	%Plug.Conn{
	adapter: {Plug.Adapters.Cowboy.Conn, :...},
	assigns: %{
	my_assigns: "here"
	},
	before_send: [
	#Function<7.125546534/1 in Phoenix.Controller.fetch_flash/2>,
	#Function<1.127904613/1 in Plug.Session.before_send/2>,
	#Function<1.43511252/1 in Plug.Logger.call/2>,
	#Function<0.70322810/1 in Phoenix.LiveReloader.before_send_inject_reloader/1>

	sns.publish({
	TargetArn: device.arn,
	MessageStructure: 'json',
	Message: JSON.stringify({
	default: 'you will never see this muah!',
	APNS_SANDBOX: JSON.stringify({
	aps: {
	'alert': '',
	'content-available': 1
	},

	-- Create a group
	CREATE ROLE readaccess;

	-- Grant access to existing tables
	GRANT USAGE ON SCHEMA public TO readaccess;
	GRANT SELECT ON ALL TABLES IN SCHEMA public TO readaccess;

	-- Grant access to future tables
	ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO readaccess;