Nguyễn Khánk's Wiki

# AWS Developement Kit

# AWS Command Line Interface (CLI)

A Command Line Interface (CLI) processes commands to a computer program in the form of lines of text. Operating systems implement a command-line interface in a shell.

AWS Command Line Interface (CLI) allows users to programmatically interact with the AWS API via entering single or multi-line commands into a shell or terminal

  • The AWS CLI is a Python executable program. Python is required to install AWS CLI
  • The AWS CLI can be installed on Windows, Mac or Linux/Unix The name of the CLI program is aws
aws ec2 describe-instances \
    --filters Name=tag-key, Values=Name \
    --query 'Reservations[*].Instances[*].{Instance:InstanceId, AZ:Placement.AvailabilityZone, Name:Tags[?Key==`Name`]|[0].value}' \
    --output table

Install/Update (opens new window)

# AWS CloudShell

AWS CloudShell is a browser-based shell built into the AWS Management Console. AWS CloudShell is scoped per region, Same credentials as logged in user. Free Service!

Preinstalled Tools: AWS CLI, Python, Node.js git, make, pip, sudo, tar, tmux, vim, wet, and zip and more

Storage included: 1 GB of storage free per AWS region

Saved files and settings: Files saved in your home directory are available in future sessions for the same AWS region

Shell Environments: Seamlessly switch between Bash, PowerShell, 7sh

# Software Development Kit (SDK)

A Software Development Kit (SDK) is a collection of software development tools in one installable package.

You can use the AWS SDK to programmatically create, modify, delete or interact with AWS resources.

Example

S3 = Aws::S3::Resource.new({
    region: aws_default_region, 
    credentials: Aws::Credentials.new(
        aws_access_key_id, 
        aws_secret_access_key
    )
})
bucket = s3.bucket s3_bucket
file = File.open file_path
md5 = Digest::MD5.hexdigest file.read
md5 = Base64.encode64( [md5].pack("H*")).strip

attrs = {
    kev: data[ "path"], 
    body: I0.read(file), 
    content_md5: md5
}
resp = bucket.put_object(attrs)

# Infrastructure as Code (IaC)

You write a configuration script to automate creating, updating or destroying cloud infrastructure.

  • IaC is a blueprint of your infrastructure.
  • IaC allows you to easily share, version or inventory your cloud infrastructure.

AWS CloudFormation AWS CloudFormation (CFN):

  • Declarative
  • What you see is what you get. Explicit
  • More verbose, but zero chance of mis-configuration
  • Uses scripting languages eg. JSON, YAML, XML

AWS CDK AWS Cloud Development Kit (CDK):

  • Imperative
  • You say what you want, and the rest is filled in. Implict
  • Less verbose, you could end up with misconfiguration
  • Does more than Declarative
  • Uses programming languages eg. Python, Ruby, JavaScript

# CloudFormation (CFN)

AWS CloudFormation allows you to write Infrastructure as Code (laC) as either a JSON or YAML file.

Example

Ec2Instance:
    Type: AWS::EC2::Instance
    Properties:
        ImageId:
            Fn::FindInMap:
                - "RegionMap"
                - Ref: "AWS::Region"
                - "AMI"
    KeyName:
        Ref: "KeyName"
    NetworkInterfaces: 
        - AssociatePublicIpAddress: "true"
            DeviceIndex: "O"
            GroupSet:
                - Ref: "myVPCEC2SecurityGroup"
            SubnetId:
                Ref: "PublicSubnet"

CloudFormation is simple but it can lead to large files or is limited in some regard to creating dynamic or repeatable infrastructure compared to CDK.

CloudFormation can be easier for DevOps Engineers who do not have a background in web programming languages.

Since CDK generates out CloudFormation its still important to be able to read and understand CloudFormation in order to debug IaC stacks.

# Cloud Development Kit

AWS CDK allows you to use your favorite programming language to write Infrastructure as Code (laC)

Example:

const bucket = new Bucket(this, 'MyBucket') ;
const result = bucket. addToResourcePolicy(new iam.PolicyStatement({
    actions: ['s3:GetObject'],
    resources: [bucket.arnForobjects('file.txt')],
    principals: [new am.AccountRootPrincipal()],
}));
  • CDK is powered by CloudFormation (it generates out CloudFormation templates)
  • CDK has a large library of reusable cloud components called CDK Construct constructs.dev (opens new window)
  • CDK comes with its own CLI
  • CDK Pipelines to quickly setup I/CD pipelines for CDK projects
  • CDK has a testing framework for Unit and Integration Testing

Note

AWS SDK looks similar, but the key difference is CDK ensures Idempotent of your Infrastructrue

# AWS Toolkit for VSCode

AWS Toolkit (opens new window)

  • AWS Explorer
  • AWS CDK Explorer
  • Amazon Elastic Container Service
  • Serverless Application

← Elastic Compute Cloud (EC2) →