thomas t56k

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May contain out of date information.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

Common Options

-#, --progress-bar Make curl display a simple progress bar instead of the more informational standard meter.

-b, --cookie <name=data> Supply cookie with request. If no =, then specifies the cookie file to use (see -c).

-c, --cookie-jar <file name> File to save response cookies to.

Subdomaining Localhost with Rails 5

I've been following this blog post on how to set up an api-only Rails 5 application. One of the sections talks about creating a subdomain for your api

Rails.application.routes.draw do
  constraints subdomain: "api" do
    scope module: "api" do

First, check your current config (example output in homebrew.mxcl.postgresql.plist.xml lower down in this gist):

cat ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

Most importantly, note the -D /usr/local/var/postgres argument.

Second, shut down your current PostgreSQL.

launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

	require 'csv'

	file = "#{Rails.root}/public/data.csv"

	table = User.all;0 # ";0" stops output. Change "User" to any model.

	CSV.open( file, 'w' ) do \|writer\|
	writer << table.first.attributes.map { \|a,v\| a }
	table.each do \|s\|
	writer << s.attributes.map { \|a,v\| v }


	Julia and Samantha are playing with strings. Julia has a string S, and Samantha has a string T which is a subsequence of string S. They are trying to find out what words are missing in T.
	Help Julia and Samantha to solve the problem. List all the missing words in T, such that inserting them at the appropriate positions in T, in the same order, results in the string S.
	Constraints
	1 <= \|T\| <= \|S\| <= 106, where \|X\| denotes the length of string X.
	The length of each word will be less than 15.

	Function Parameter
	You are given a function missingWords that takes the strings S and T as its arguments.

	# Install ARCH Linux with encrypted file-system and UEFI
	# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

	# Download the archiso image from https://www.archlinux.org/
	# Copy to a usb-drive
	dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

	# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

	# Set swiss-french keymap

	func main() {
	str := "abc foo:bar def baz:qux ghi"
	re := regexp.MustCompile("([a-z]+):([a-z]+)")
	result := ReplaceAllStringSubmatchFunc(re, str, func(groups []string) string {
	return groups[1] + "." + groups[2]
	})
	fmt.Printf("'%s'\n", result)
	}

	$ brew uninstall postgresql
	$ gem uninstall pg # ALL OF THEM
	$ rm -fr /usr/local/var/postgres
	$ launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
	$ pg_ctl -D /usr/local/var/postgres stop -s -m fast # WE SHOULD HAVE ALL postgres SERVERS & PROCESSES STOPPED BY NOW
	$ brew install postgres
	$ env ARCHFLAGS="-arch x86_64" gem install pg
	$ echo "DONE." >> /dev/null