Carlos Roman carlochess

Manually Edit AWS Console "Switch Role" Configuration in Bash

Motivation

At Gruntwork, we work with multiple software teams. That means we have to modify the "Switch Role" history multiple times. But the only way to do that today is to delete your cookie and clear all AWS Console saved settings. That got old after a while, so these instructions enable you to modify the "Switch Roles" configuration directly.

The Big Picture

AWS CLI JMESPath cheatsheet

Random query recipes of JMESPath for the AWS CLI tools that I might have written or stumbled upon.

Examples

My Elasticsearch cheatsheet with example usage via rest api (still a work-in-progress)

Shortlinks:

Cluster Health
- Index Level
- Shard Level
Nodes Overview
Indices Overview
Cluster Maintenance

DNS Command Line Configuration on macOS

The following commands work on macOS High Sierra, not tested in previous versions

Get DNS Resolvers

$ scutil --dns | grep 'nameserver\[[0-9]*\]'

Tunneling Ethernet Over SSH With Socat and Tap Devices

There are circumstances where one wants to attach the local machine to the same layer 2 ethernet segment, which a remote machine is connected to, with the only available transport being SSH.

While this solution has quite some shortcomings and should not be used to replace a real VPN, it can be beneficial e.g. for debugging network issues remotely.

Learn Go in ~5mins

This is inspired by A half-hour to learn Rust and Zig in 30 minutes.

Basics

Your first Go program as a classical "Hello World" is pretty simple:

First we create a workspace for our project:

	'use strict';

	// Dependencies
	const gcloud = require('google-cloud', {
	projectId: 'sara-bigquery',
	keyfileName: 'keyfile.json'
	});
	const vision = gcloud.vision();
	const fs = require('fs');
	const async = require('async');

	pipeline {
	agent any
	stages {
	stage('Build') {
	steps {
	sh 'docker build -t openjobs:latest .'
	sh 'docker-compose build'
	sh 'docker-compose run web bundle install'
	sh 'docker-compose run web yarn'
	sh 'docker-compose run -e RAILS_ENV=test --rm web bundle exec rake db:drop db:create db:migrate'

	#! /bin/bash

	d="$(mktemp -d)"

	# Make a git repo with one file in it.
	mkdir "$d/good"
	cd "$d/good"
	git init
	echo good > file.txt
	git add -A

	default['sshd']['sshd_config']['AuthenticationMethods'] = 'publickey,keyboard-interactive:pam'
	default['sshd']['sshd_config']['ChallengeResponseAuthentication'] = 'yes'
	default['sshd']['sshd_config']['PasswordAuthentication'] = 'no'