AWS Node.js Lambda Function & API Gateway
AWS Lambda was introduced in 2014, and it is a compute service that runs code in response to events and automatically manages the compute resources required by that code.
The purpose of Lambda, as opposed to AWS EC2, is to simplify building smaller, on-demand applications that are responsive to events and new information. AWS targets starting a Lambda instance within milliseconds of an event.
AWS Lambda was designed for use cases such as image upload, responding to website clicks or reacting to output from a connected device. AWS Lambda can also be used to automatically provision back-end services triggered by custom requests.
Unlike Amazon EC2, which is priced by the hour, AWS Lambda is metered in increments of 100 milliseconds.
- wiki - Amazon Lambda
From AWS Lambda => Create a Lambda function, then on Select blueprint => Blank Function with Node.js 6.10 runtime.
We'll skip Configure triggers, so click Next.
This time we will use "Edit code inline" and make index.js:
exports.handler = (event, context, callback) => {
let min = 0;
let max = 100;
let rand = Math.floor(Math.random()*max)+min;
callback(null, rand);
};
Note that we used index.handler for Handler. Here index is the lambda function name and handler is the one that we export in the function.
For policy we chose "Simple Microservice permissions". Click Create function on "Review" page.
Click Test button and just accept the popup for test config. Then, we get the number generated and the logs:
We want to see the output from our browser. Go to Gate API and create a new API:
Now we'll create a new resource and method:
Let's make a resource first:
Then, create GET method by selecting GET under "Actions" dropdown:
Hit "OK".
Now, API is ready to deploy. Select "Deploy API" under "Actions" dropdown menu:
Click "Deploy" button:
Now that we have url, let's put it into our browser:
We get another random number if we refresh the browser:
To get the user input, we should modify our code:
'use strict';
console.log('Loading funciton');
exports.handler = (event, context, callback) => {
let min = parseInt(event.min);
let max = parseInt(event.max);
let rand = Math.floor(Math.random()*max)+min;
callback(null, rand);
};
Another thing to do is updating API Gateway. "Integrtion Request" ==> "Body Mapping Templates":
Click "check-mark":
Here is our new tempalte in json format:
Save the template. Then, we need to re-deploy the API:
Now we get the random number in range 1-1000 as the user requested:
Connecting Lambda to API Gateway (Getting started with AWS Lambda, part 3)
AWS (Amazon Web Services)
- AWS : EKS (Elastic Container Service for Kubernetes)
- AWS : Creating a snapshot (cloning an image)
- AWS : Attaching Amazon EBS volume to an instance
- AWS : Adding swap space to an attached volume via mkswap and swapon
- AWS : Creating an EC2 instance and attaching Amazon EBS volume to the instance using Python boto module with User data
- AWS : Creating an instance to a new region by copying an AMI
- AWS : S3 (Simple Storage Service) 1
- AWS : S3 (Simple Storage Service) 2 - Creating and Deleting a Bucket
- AWS : S3 (Simple Storage Service) 3 - Bucket Versioning
- AWS : S3 (Simple Storage Service) 4 - Uploading a large file
- AWS : S3 (Simple Storage Service) 5 - Uploading folders/files recursively
- AWS : S3 (Simple Storage Service) 6 - Bucket Policy for File/Folder View/Download
- AWS : S3 (Simple Storage Service) 7 - How to Copy or Move Objects from one region to another
- AWS : S3 (Simple Storage Service) 8 - Archiving S3 Data to Glacier
- AWS : Creating a CloudFront distribution with an Amazon S3 origin
- AWS : Creating VPC with CloudFormation
- AWS : WAF (Web Application Firewall) with preconfigured CloudFormation template and Web ACL for CloudFront distribution
- AWS : CloudWatch & Logs with Lambda Function / S3
- AWS : Lambda Serverless Computing with EC2, CloudWatch Alarm, SNS
- AWS : Lambda and SNS - cross account
- AWS : CLI (Command Line Interface)
- AWS : CLI (ECS with ALB & autoscaling)
- AWS : ECS with cloudformation and json task definition
- AWS Application Load Balancer (ALB) and ECS with Flask app
- AWS : Load Balancing with HAProxy (High Availability Proxy)
- AWS : VirtualBox on EC2
- AWS : NTP setup on EC2
- AWS: jq with AWS
- AWS & OpenSSL : Creating / Installing a Server SSL Certificate
- AWS : OpenVPN Access Server 2 Install
- AWS : VPC (Virtual Private Cloud) 1 - netmask, subnets, default gateway, and CIDR
- AWS : VPC (Virtual Private Cloud) 2 - VPC Wizard
- AWS : VPC (Virtual Private Cloud) 3 - VPC Wizard with NAT
- DevOps / Sys Admin Q & A (VI) - AWS VPC setup (public/private subnets with NAT)
- AWS - OpenVPN Protocols : PPTP, L2TP/IPsec, and OpenVPN
- AWS : Autoscaling group (ASG)
- AWS : Setting up Autoscaling Alarms and Notifications via CLI and Cloudformation
- AWS : Adding a SSH User Account on Linux Instance
- AWS : Windows Servers - Remote Desktop Connections using RDP
- AWS : Scheduled stopping and starting an instance - python & cron
- AWS : Detecting stopped instance and sending an alert email using Mandrill smtp
- AWS : Elastic Beanstalk with NodeJS
- AWS : Elastic Beanstalk Inplace/Rolling Blue/Green Deploy
- AWS : Identity and Access Management (IAM) Roles for Amazon EC2
- AWS : Identity and Access Management (IAM) Policies, sts AssumeRole, and delegate access across AWS accounts
- AWS : Identity and Access Management (IAM) sts assume role via aws cli2
- AWS : Creating IAM Roles and associating them with EC2 Instances in CloudFormation
- AWS Identity and Access Management (IAM) Roles, SSO(Single Sign On), SAML(Security Assertion Markup Language), IdP(identity provider), STS(Security Token Service), and ADFS(Active Directory Federation Services)
- AWS : Amazon Route 53
- AWS : Amazon Route 53 - DNS (Domain Name Server) setup
- AWS : Amazon Route 53 - subdomain setup and virtual host on Nginx
- AWS Amazon Route 53 : Private Hosted Zone
- AWS : SNS (Simple Notification Service) example with ELB and CloudWatch
- AWS : Lambda with AWS CloudTrail
- AWS : SQS (Simple Queue Service) with NodeJS and AWS SDK
- AWS : Redshift data warehouse
- AWS : CloudFormation
- AWS : CloudFormation Bootstrap UserData/Metadata
- AWS : CloudFormation - Creating an ASG with rolling update
- AWS : Cloudformation Cross-stack reference
- AWS : OpsWorks
- AWS : Network Load Balancer (NLB) with Autoscaling group (ASG)
- AWS CodeDeploy : Deploy an Application from GitHub
- AWS EC2 Container Service (ECS)
- AWS EC2 Container Service (ECS) II
- AWS Hello World Lambda Function
- AWS Lambda Function Q & A
- AWS Node.js Lambda Function & API Gateway
- AWS API Gateway endpoint invoking Lambda function
- AWS API Gateway invoking Lambda function with Terraform
- AWS API Gateway invoking Lambda function with Terraform - Lambda Container
- Amazon Kinesis Streams
- AWS: Kinesis Data Firehose with Lambda and ElasticSearch
- Amazon DynamoDB
- Amazon DynamoDB with Lambda and CloudWatch
- Loading DynamoDB stream to AWS Elasticsearch service with Lambda
- Amazon ML (Machine Learning)
- Simple Systems Manager (SSM)
- AWS : RDS Connecting to a DB Instance Running the SQL Server Database Engine
- AWS : RDS Importing and Exporting SQL Server Data
- AWS : RDS PostgreSQL & pgAdmin III
- AWS : RDS PostgreSQL 2 - Creating/Deleting a Table
- AWS : MySQL Replication : Master-slave
- AWS : MySQL backup & restore
- AWS RDS : Cross-Region Read Replicas for MySQL and Snapshots for PostgreSQL
- AWS : Restoring Postgres on EC2 instance from S3 backup
- AWS : Q & A
- AWS : Security
- AWS : Security groups vs. network ACLs
- AWS : Scaling-Up
- AWS : Networking
- AWS : Single Sign-on (SSO) with Okta
- AWS : JIT (Just-in-Time) with Okta
Ph.D. / Golden Gate Ave, San Francisco / Seoul National Univ / Carnegie Mellon / UC Berkeley / DevOps / Deep Learning / Visualization
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