Samuel Loh Yin Kang samloh84

Polyglot Web programmer and Linux Administration, PKI and Docker enthusiast

samloh84 / delete_zone.py

Last active April 13, 2020 01:18

	import boto3

	client = boto3.client('route53')


	def delete_zone(zone_id):
	""" List all records and deletes non SOA/NS records, before deleting the zone
	"""
	record_sets = client.list_resource_record_sets(HostedZoneId=zone_id)
	# print(record_sets)

samloh84 / delete_zone.py

Created April 13, 2020 01:17

	import boto3

	client = boto3.client('route53')


	def delete_zone(zone_id):
	""" Deleting a hosted zone in AWS is a real pain if you have any number of
	resource records defined because you must first delete all RR's in order to
	remove the zone. This is a one-stop script to do all of that in one command.
	"""

samloh84 / release_unassociated_ips.sh

Created January 24, 2020 05:39

	#!bin/bash
	set -euxo pipefail
	ALLOCATION_IDS=$(aws ec2 describe-addresses \| jq -r '.Addresses[] \| select(.AssociationId == null) \| .AllocationId')

	for ALLOCATION_ID in $ALLOCATION_IDS; do
	aws ec2 release-address --allocation-id $ALLOCATION_ID
	done

samloh84 / ipv4_util.js

Created September 9, 2019 06:46

	const _ = require('lodash');


	const octet_regex = new RegExp('[0-9]\|[1-9][0-9]\|1[0-9][0-9]\|2[0-4][0-9]\|25[0-5]');
	const ipv4_regex = new RegExp(`^(${octet_regex.source})\.(${octet_regex.source})\.(${octet_regex.source})\.(${octet_regex.source})$`);
	const ipv4_cidr_regex = new RegExp(`^(?<ipv4>(${octet_regex.source})\.(${octet_regex.source})\.(${octet_regex.source})\.(${octet_regex.source}))\/(?<prefix>[0-9]\|[1-2][0-9]\|3[0-2])$`);


	let validate_ipv4_cidr = function (cidr) {
	return ipv4_cidr_regex.test(cidr);

samloh84 / docker-machine.sh

Created August 17, 2019 08:00

	#!/bin/bash
	function docker_machine_start() {
	if [[ -x "$(command -v docker-machine)" ]]; then
	if [[ "$(docker-machine status)" == "Running" ]]; then
	if [[ $(expr $(date +%s) - $(docker run --rm centos date +%s) \| tr -d -) -gt 300 ]]; then
	docker-machine restart
	fi
	else
	docker-machine start
	fi

samloh84 / ssh-agent.sh

Created May 24, 2019 03:01

SSH Agent Startup Script

	#!/bin/bash

	if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
	echo -e "You should run the following command:\nsource bin/${0}"
	exit 1
	fi

	PRIVATE_KEYS=$(grep -l -r "\\-\\+BEGIN [[:alpha:]]\+ PRIVATE KEY\\-\\+" ${HOME}/.ssh)

	eval $(ssh-agent)

samloh84 / docker.sh

Created May 13, 2019 01:33

Docker Utility Script

	#!/bin/bash

	DOCKER_MACHINE_NAME=${DOCKER_MACHINE_NAME:-default}

	DOCKER_REGISTRY_NAMES=${DOCKER_REGISTRY_NAMES:-}
	DOCKER_IMAGE_NAMES=${DOCKER_IMAGE_NAMES:-$(basename ${PWD})}
	DOCKER_IMAGE_TAGS=${DOCKER_IMAGE_TAGS:-latest}

	DOCKER_RUN_WORKING_DIRECTORY=${DOCKER_RUN_WORKING_DIRECTORY:-/usr/src/app}

samloh84 / index.html

Created May 2, 2019 13:00

Monaco Editor

	<!doctype html>
	<html lang="en">
	<head>
	<link href="https://cdnjs.cloudflare.com/ajax/libs/monaco-editor/0.16.2/min/vs/editor/editor.main.css"
	rel="stylesheet">
	<style>
	#container {
	width: 90%;
	height: 800px;
	margin-left: auto;

samloh84 / latest_centos_ami.tf

Created April 29, 2019 01:51

Terraform gists

samloh84 / mac-clear-dns.sh

Created March 25, 2019 03:15

clear dns

	#!/bin/bash
	dscacheutil -flushcache; sudo killall -HUP mDNSResponder