Dexter  Goodwin

Dexter Goodwin

1614935643

AWS CDK - How You Could Configure Your Application

I’ve been working with Amazon Web Services for nearly two years now. I started with plain CloudFormation templates and switched to the Cloud Development Kit about 8 months ago. It’s a pretty neat tool and makes deploying resources fairly easy. What I enjoy about it the most is how you can modularize your code and how easy you can share resources across stacks. However, I encourage you to start learning CloudFormation before jumping into CDK right away because CDK compiles to CloudFormation templates and sometimes you need to know how they work, otherwise you run in some issues. Let me show you an example:

const myBucketArnParam = StringParameter.fromStringParameterName(this, 'MyBucketArnParam', '/my-bucket/arn');
const myBucket = Bucket.fromBucketArn(this, 'MyBucket', myBucketArnParam.stringValue);

console.info(myBucketArnParam.stringValue);
bucket.grantRead(someRole);

CDK Pitfalls

One might think that the value of myBucketArnParam will be printed to the console. But actually it prints: ${Token[TOKEN.575]} because the SSM parameter is not resolved at compile time but when the template is executed. The other problem is that .grantRead() should give “permission to use the key to decrypt the contents of the bucket […]”. This is only right, if the bucket and the key are in the same stack because the key policy must be created alongside the key. In other words you will not be allowed to decrypt the data. Anyway, let’s come to the topic of this article.

#typescript #config

What is GEEK

Buddha Community

AWS CDK - How You Could Configure Your Application
Christa  Stehr

Christa Stehr

1598408880

How To Unite AWS KMS with Serverless Application Model (SAM)

The Basics

AWS KMS is a Key Management Service that let you create Cryptographic keys that you can use to encrypt and decrypt data and also other keys. You can read more about it here.

Important points about Keys

Please note that the customer master keys(CMK) generated can only be used to encrypt small amount of data like passwords, RSA key. You can use AWS KMS CMKs to generate, encrypt, and decrypt data keys. However, AWS KMS does not store, manage, or track your data keys, or perform cryptographic operations with data keys.

You must use and manage data keys outside of AWS KMS. KMS API uses AWS KMS CMK in the encryption operations and they cannot accept more than 4 KB (4096 bytes) of data. To encrypt application data, use the server-side encryption features of an AWS service, or a client-side encryption library, such as the AWS Encryption SDK or the Amazon S3 encryption client.

Scenario

We want to create signup and login forms for a website.

Passwords should be encrypted and stored in DynamoDB database.

What do we need?

  1. KMS key to encrypt and decrypt data
  2. DynamoDB table to store password.
  3. Lambda functions & APIs to process Login and Sign up forms.
  4. Sign up/ Login forms in HTML.

Lets Implement it as Serverless Application Model (SAM)!

Lets first create the Key that we will use to encrypt and decrypt password.

KmsKey:
    Type: AWS::KMS::Key
    Properties: 
      Description: CMK for encrypting and decrypting
      KeyPolicy:
        Version: '2012-10-17'
        Id: key-default-1
        Statement:
        - Sid: Enable IAM User Permissions
          Effect: Allow
          Principal:
            AWS: !Sub arn:aws:iam::${AWS::AccountId}:root
          Action: kms:*
          Resource: '*'
        - Sid: Allow administration of the key
          Effect: Allow
          Principal:
            AWS: !Sub arn:aws:iam::${AWS::AccountId}:user/${KeyAdmin}
          Action:
          - kms:Create*
          - kms:Describe*
          - kms:Enable*
          - kms:List*
          - kms:Put*
          - kms:Update*
          - kms:Revoke*
          - kms:Disable*
          - kms:Get*
          - kms:Delete*
          - kms:ScheduleKeyDeletion
          - kms:CancelKeyDeletion
          Resource: '*'
        - Sid: Allow use of the key
          Effect: Allow
          Principal:
            AWS: !Sub arn:aws:iam::${AWS::AccountId}:user/${KeyUser}
          Action:
          - kms:DescribeKey
          - kms:Encrypt
          - kms:Decrypt
          - kms:ReEncrypt*
          - kms:GenerateDataKey
          - kms:GenerateDataKeyWithoutPlaintext
          Resource: '*'

The important thing in above snippet is the KeyPolicy. KMS requires a Key Administrator and Key User. As a best practice your Key Administrator and Key User should be 2 separate user in your Organisation. We are allowing all permissions to the root users.

So if your key Administrator leaves the organisation, the root user will be able to delete this key. As you can see **KeyAdmin **can manage the key but not use it and KeyUser can only use the key. ${KeyAdmin} and **${KeyUser} **are parameters in the SAM template.

You would be asked to provide values for these parameters during SAM Deploy.

#aws #serverless #aws-sam #aws-key-management-service #aws-certification #aws-api-gateway #tutorial-for-beginners #aws-blogs

Seamus  Quitzon

Seamus Quitzon

1601341562

AWS Cost Allocation Tags and Cost Reduction

Bob had just arrived in the office for his first day of work as the newly hired chief technical officer when he was called into a conference room by the president, Martha, who immediately introduced him to the head of accounting, Amanda. They exchanged pleasantries, and then Martha got right down to business:

“Bob, we have several teams here developing software applications on Amazon and our bill is very high. We think it’s unnecessarily high, and we’d like you to look into it and bring it under control.”

Martha placed a screenshot of the Amazon Web Services (AWS) billing report on the table and pointed to it.

“This is a problem for us: We don’t know what we’re spending this money on, and we need to see more detail.”

Amanda chimed in, “Bob, look, we have financial dimensions that we use for reporting purposes, and I can provide you with some guidance regarding some information we’d really like to see such that the reports that are ultimately produced mirror these dimensions — if you can do this, it would really help us internally.”

“Bob, we can’t stress how important this is right now. These projects are becoming very expensive for our business,” Martha reiterated.

“How many projects do we have?” Bob inquired.

“We have four projects in total: two in the aviation division and two in the energy division. If it matters, the aviation division has 75 developers and the energy division has 25 developers,” the CEO responded.

Bob understood the problem and responded, “I’ll see what I can do and have some ideas. I might not be able to give you retrospective insight, but going forward, we should be able to get a better idea of what’s going on and start to bring the cost down.”

The meeting ended with Bob heading to find his desk. Cost allocation tags should help us, he thought to himself as he looked for someone who might know where his office is.

#aws #aws cloud #node js #cost optimization #aws cli #well architected framework #aws cost report #cost control #aws cost #aws tags

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Rory  West

Rory West

1620881100

AWS: Benefits & Applications in Real World

Amazon Web Services or AWS is the cloud infrastructure and web services division of Amazon.com, the biggest retail player in the world. It is designed to bring immense benefits to organizations. Some organizations, in their excitement to benefit from Amazon, move their applications to AWS without even considering or adopting the lift and shift approach.

Despite the miss, these organizations are accorded the advantages that come with using a cost-efficient and secure infrastructure. But it is very easy for these organizations to forget that it is not that easy to enjoy the twin benefits of agility and flexibility without adopting the recommended changes.

Yes, it is true. Most IT engineers, developers, and programmers do not realize the need to evolve their organization’s architectures to experience the advantages that come with AWS. New applications, scalability, and efficiency are achievable by using cloud-related IT architecture patterns.

#aws #aws applications #aws benefits #aws use cases

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