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Redis Note

Features

• An in-memory database (often shortened to IMDB) which stores data using the main memory of a machine as the primary storage facility, rather than storing the data on a disk as in a typical disk-optimized database.
• Redis can store a mapping of keys to values (Key-Value Store) and can even achieve similar performance levels as memcached.
• Redis supports the writing of its data to disk
• Redis has two different forms of writing in-memory data to disk in a compact format:
  1. point-in-time dump (snapshot): when certain conditions are met (a number of writes in a given period) or when one of the two dump-to-disk commands is called

2. append-only file: writes every command that alters data in Redis to disk as it happens

crazyguitar

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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Docker Swarm Note

Common commands

• swarm init
• swarm join
• service create
• service inspect
• service ls
• service rm

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System design

Faas concepts

1. Event driven system - serverless function usually glue the services together and work properly.
2. Serverless function was called service bus in the past.
3. The features of serverless function:
   1. short-lived
   2. not a daemon
4. stateful

crazyguitar

Lambda note

Quick Start

Using AWS CodeStar will be a great choice to learn how to build, test, and deploy the lambda function to AWS. The following links are the best tutorials for learning how to use CodeStart and Lambda.

• Serverless Computing and Applications
• Run a Serverless "Hello, World!"
• Getting Started with AWS CodeStar

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Boto Note

Quick Start

S3

Before start using boto3, we should set up an user on AWS IAM and grant S3 access permission.

List Buckets

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CodeBuid, CodeDeploy, CodePipeline

CodeBuild

Build Spec Syntax

1. version: Required mapping. Represents the build spec version. We recommend you use 0.2.
2. env: Optional sequence. Represents information for one or more custom environment variables.
3. phases: Required sequence. Represents the commands AWS CodeBuild will run during each phase of the build.
4. artifacts: Optional sequence. Represents information about where AWS CodeBuild can find the build output and

crazyguitar

Lambda note

Quick Start With DynamoDB

A DynamoDB stream is an ordered flow of information about changes to items in an Amazon DynamoDB table. In this case, lambda function poll the stream of DynamoDB 4 times per seconds and be trigered by an event of DynamoDB stream.

Futher reading:

crazyguitar

Lambda note

Quick Start with S3

Lambda function can detect events of S3 operations including put, delete, move. Therefore, we can use lambda function to monitor S3 buckets which contain the data we are interesting.

Process the S3 event

First, we git clone the serverless-application-model from GitHub

crazyguitar

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.

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