Cisco cloud corner on AWS Lambda

AWS Lambda lets you run code without provisioning or managing servers

Serverless Frameworks

• Serverless
• Claudia.js
• Apex

Serverless blogs

• http://blog.d2-si.fr/2017/05/31/monitoring-aws-lambda/
• https://read.acloud.guru/serverless/home
• https://medium.com/search?q=serverless%20aws
• Choosing a Microservices Deployment Strategy

Serverless projects

• Serverless chat
• Claudia Bot Builder

Serverless Meetups

• Paris Serverless Architecture Meetup

Serverless resources

The following tutorial can be done manually or run within serverless.com framework.

To install and use the serverless framework:

npm install -g serverless
npm install
serverless deploy

Create a lambda function

1. From the AWS console, go to Compute -> Lambda
2. Click Get Started Now if this is the first time you create a Lambda function or Create a Lambda function
3. Select microservice-http-endpoint blueprint
4. Enter:
   • Security: Open (I know! It's bad)
5. Click Next
6. Enter:
   • In Section Configure function:
   • Name: LambdaNodeJsToDynamoDB
   • In Section Lambda function handler and role:
   • Role Name: AccessToDynamoDB
7. Click Next
8. Click Create function

Read an item into DynamoDB using API Gateway and your lambda function

When the Lambda function has been created

1. Goto Trigger tab and click to the API Gateway URL.

The following message is displayed:

{"message": "Internal server error"}

This is because the Lambda function is expecting a query parameter named TableName followed by the DynamoDB table to read

1. Add the query parameter ?TableName=CloudCorner at the end of the API Gateway URL

The following message is displayed:

Requested resource not found

This is because the DynamoDB table CloudCorner doesn't exist

1. From the AWS console, go to Database -> DynamoDB
2. Select Create Table

• Table name: CloudCorner
• Primary key: UserID Number
• Click Create

Wait until the CloudCorner table has been created

1. Select the CloudCorner table
2. Go to folder Items and select Create Item
3. Enter:
   • UserID: 1
4. Click on + -> Append -> String. Enter:
   • LastName: Enter your last name
5. Click Save
6. Retry the API Gateway URL

The following message is displayed:

{"Items":[{"UserID":"1","LastName":"ARQUES"}],"Count":1,"ScannedCount":1}

Congratulations : We have created your first API Gateway end point and your first lambda function that interacts with DynamoDB

Insert an item into DynamoDB using API Gateway and your lambda function

1. Install postman add-on
2. Copy/Paste the API Gateway URL of your Lambda function into postman without query parameter
3. Select the POST HTTP method
4. Copy/Paste into the body of the POST request:

{
    "Item": {
     "UserID": 10,
     "LastName": "CLOUD GUY"
    },
    "TableName": "CloudCorner"
}  

1. Send the Request
2. From the AWS console, go to Database -> DynamoDB
3. Select CloudCorner table and check that your item has been added
4. You can also perform the GET request into postman or your web browser by adding query parameter TableName with value CloudCorner

Cleanup

1. Delete the CloudCorner DynamoDB table
2. Delete the LambdaMicroservice API Gateway
3. Delete the LambdaNodeJsToDynamoDB Lambda function
4. Delete the AccessToDynamoDB IAM Role
5. Delete the /aws/lambda/LambdaNodeJsToDynamoDB CloudWatch log group