Samir M. Braga samir

WARNING

May contain out of date information. Check the comments below!

The list of actions listed below was taken mostly from Book Of Zeus with minor modifications and did the job well for Ubuntu version, which was available at that moment (May 2016). This gist was created for internal use and was never meant to be discovered by the web, although Google managed to find and index this page, which was a great surprise for me. Please check the original source for the updated information (links are provided in most of the sections), and read the comments below: they provide more details about the usage experience.

System Updates

http://bookofzeus.com/harden-ubuntu/initial-setup/system-updates/

Keeping the system updated is vital before starting anything on your system. This will prevent people to use known vulnerabilities to enter in your system.

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

Adding an audit log to your Rails app

If you have any sort of administrative interface on your web site, you can easily imagine an intruder gaining access and mucking about. How do you know the extent of the damage? Adding an audit log to your app is one quick solution. An audit log should record a few things:

controller entry points with parameter values
permanent information about the user, like user_id
transient information about the user, like IP and user_agent

Using the Rails framework, this is as simple as adding a before_action to your admin controllers. Here’s a basic version that I’m using in production.

Convert sequence of JPEG images to MP4 video

Simple glob:

ffmpeg -r 24 -i '*.JPG' -s hd1080 -vcodec libx264 timelapse.mp4

Start from DSC_0079.JPG

ffmpeg -r 24 -f image2 -start_number 79 -i DSC_%04d.JPG -s hd1080 -vcodec libx264 timelapse2.mp4

https://www.youtube.com/watch?v=cPbl26Fw-dk

Quer brincar de Eike Bastista nessa porra!
Matar um leão por dia.
Faca nos dentes
Sangue no olho
É matar ou morrer
Dando muque em macaco de gaveta
É largar mato na caçamba
Jogar terra na boca de carrapato

rbenv: remove RUBY_FREE_MIN and RUBY_HEAP_MIN_SLOTS warnings on Ruby 2.1.0

If you are like me, then you might have some Ruby projects running on different Ruby versions, so you'll need to either upgrade those old projects to Ruby 2.1.10 or deal with these warnings:

/Users/marc/.rbenv/versions/2.1.0/bin/ruby: warning: RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead.
/Users/marc/.rbenv/versions/2.1.0/bin/ruby: warning: RUBY_HEAP_MIN_SLOTS is obsolete. Use RUBY_GC_HEAP_INIT_SLOTS instead.
ruby: warning: RUBY_FREE_MIN is obsolete. Use RUBY_GC_HEAP_FREE_SLOTS instead.
ruby: warning: RUBY_HEAP_MIN_SLOTS is obsolete. Use RUBY_GC_HEAP_INIT_SLOTS instead.

	🟩🟨⬜ Speed Wordle

	* scroll down for secret 5-word cheat sheet
	* solve any Wordle in less than one minute with these words
	* cheat sheet of 5 words that uses 24 / 26 unique English letters!
	* comments + questions -> https://news.ycombinator.com/item?id=30459184

	#!/bin/bash

	### USAGE
	###
	### ./ElasticSearch.sh 1.7 will install Elasticsearch 1.7
	### ./ElasticSearch.sh will fail because no version was specified (exit code 1)
	###
	### CLI options Contributed by @janpieper
	### Check http://www.elasticsearch.org/download/ for latest version of ElasticSearch

	# Call scopes directly from your URL params:
	#
	# @products = Product.filter(params.slice(:status, :location, :starts_with))
	module Filterable
	extend ActiveSupport::Concern

	module ClassMethods

	# Call the class methods with names based on the keys in <tt>filtering_params</tt>
	# with their associated values. For example, "{ status: 'delayed' }" would call

	unless Rails.env.production?
	connection = ActiveRecord::Base.connection
	connection.tables.each do \|table\|
	connection.execute("TRUNCATE #{table}") unless table == "schema_migrations"
	end

	sql = File.read('db/import.sql')
	statements = sql.split(/;$/)
	statements.pop