Minh Son Tran MinhSonMTA

System Design Course

Learn how to design systems at scale and prepare for system design interviews.

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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Please make fork of this, as this can be removed by Github.com sooner or later.

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How to setup AWS lambda function to talk to the internet and VPC

I'm going to walk you through the steps for setting up a AWS Lambda to talk to the internet and a VPC. Let's dive in.

So it might be really unintuitive at first but lambda functions have three states.

No VPC, where it can talk openly to the web, but can't talk to any of your AWS services.
VPC, the default setting where the lambda function can talk to your AWS services but can't talk to the web.
VPC with NAT, The best of both worlds, AWS services and web.

Best Practices for Azure Redis

Below are a set of best practices that I recommend for most customers. This information is based on my experience helping hundreds of Azure Redis customers investigate various issues.

Configuration and Concepts

Use Standard or Premium Tier for Production systems. The Basic Tier is a single node system with no data replication and no SLA. Also, use at least a C1 cache. C0 caches are really meant for simple dev/test scenarios since they have a shared CPU core, very little memory, are prone to "noisy neighbor", etc.
Remember that Redis is an In-Memory data store. Read this article so that you are aware of scenarios where data loss can occur.
Configure your client library to use a "connect timeout" of at least 10 to 15 seconds, giving the system time to connect even under higher CPU conditions. If your client or server tend to be under high load

	#!/usr/bin/env bash
	#
	# Bootstrap script for setting up a new OSX machine
	#
	# This should be idempotent so it can be run multiple times.
	#
	# Some apps don't have a cask and so still need to be installed by hand. These
	# include:
	#
	# - Twitter (app store)

	version: "3"

	services:
	sonarqube:
	image: sonarqube
	expose:
	- 9000
	ports:
	- "127.0.0.1:9000:9000"
	networks:

	#!/bin/bash

	set -e

	AAPT="/path/to/android-sdk/build-tools/23.0.3/aapt"
	DX="/path/to/android-sdk/build-tools/23.0.3/dx"
	ZIPALIGN="/path/to/android-sdk/build-tools/23.0.3/zipalign"
	APKSIGNER="/path/to/android-sdk/build-tools/26.0.1/apksigner" # /!\ version 26
	PLATFORM="/path/to/android-sdk/platforms/android-19/android.jar"

	### java -jar

	java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=8001,suspend=y -jar target/cxf-boot-simple-0.0.1-SNAPSHOT.jar


	### Maven

	Debug Spring Boot app with Maven:

	mvn spring-boot:run -Drun.jvmArguments="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8001"