AWS Lambda is a responsive cloud service that inspects actions within the application and responds by deploying the user-defined codes, known as functions. It automatically manages the compute resources across multiple availability zones and scales them when new actions are triggered.

AWS Lambda supports the code written in Java, Python and Node.js, and the service can launch processes in languages supported by Amazon Linux (includes Bash, Go & Ruby).

Following are some recommended tips while using AWS Lambda.

Write your Lambda function code in a stateless style.
Never declare any function variable outside the scope of the handler.
Make sure to have a set of +rx permissions on your files in the uploaded ZIP to ensure Lambda can execute code on your behalf.
Delete old Lambda functions when no longer required.

Follow these steps to configure AWS Lambda for the first time.

Step 1 − Sign in to AWS account.

Step 2 − Select Lambda from AWS services section.

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Step 3 − Select a Blueprint (optional) and click the Skip button.

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Step 4 − Provide the necessary details to create a Lambda function as shown in the following screenshot and paste the Node.js code that will be triggered automatically whenever a new item is added in DynamoDB. Select all the required permissions.

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Step 5 − Click the Next button and verify your details.

Step 6 − Click the Create Function button.

Now, when we select the Lambda service and select the Event Sources tab, there will be no records. Add at least one source to the Lambda function to work. Here, we are adding DynamoDB Table to it.

We have created a table using DynamoDB (we will discuss this in detail in DynamoDB chapter).

Step 7 − Select the stream tab and associate it with the Lambda function.

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You will see this entry in Event Sources Tab of Lambda Service page.

Step 8 − Add some entries into the table. When the entry gets added and saved, then Lambda service should trigger the function. It can be verified using the Lambda logs.

Step 9 − To view logs, select the Lambda service and click the Monitoring tab. Then click the View Logs in CloudWatch.

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Benefits of AWS Lambda

Following are some of the benefits of using Lambda tasks −

Lambda tasks need not to be registered like Amazon SWF activity types.
We can use any existing Lambda functions that you’ve already defined in workflows.
Lambda functions are called directly by Amazon SWF; there is no need design a program to implement and execute them.
Lambda provides us the metrics and logs for tracking function executions.

AWS Lambda Limits

Following are the three types of Lambda limits.

Throttle Limit

The throttle limit is 100 concurrent Lambda function executions per account and is applied to the total concurrent executions across all functions within a same region.

The formula to calculate the number of concurrent executions for a function = (average duration of the function execution) X (number of requests or events processed by AWS Lambda).

When throttle limit is reached, then it returns a throttling error having an error code 429. After 15-30 minute you can start work again. The throttle limit can be increased by contacting AWS support center.

Resources Limit

The following table shows the list of resources limits for a Lambda function.

Resource	Default Limit
Ephemeral disk capacity (“/tmp” space)	512 MB
Number of file descriptors	1,024
Number of processes and threads (combined total)	1,024
Maximum execution duration per request	300 seconds
Invoke request body payload size	6 MB
Invoke response body payload size	6 MB

Service Limit

The following table shows the list of services limits for deploying a Lambda function.

Item	Default Limit
Lambda function deployment package size (.zip/.jar file)	50 MB
Size of code/dependencies that you can zip into a deployment package (uncompressed zip/jar size)	250 MB
Total size of all the deployment packages that can be uploaded per region	1.5 GB
Number of unique event sources of the Scheduled Event source type per account	50
Number of unique Lambda functions you can connect to each Scheduled Event	5

For latest updated limit structure & more information, visit − https://docs.aws.amazon.com/lambda/latest/dg/limits.html/

So, this brings us to the end of blog. This Tecklearn ‘How to Configure AWS Lambda’ helps you with commonly asked questions if you are looking out for a job in AWS and Cloud Computing. If you wish to learn AWS and build a career in Cloud Computing domain, then check out our interactive, AWS Solutions Architect Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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Overview of Cloud Computing and AWS

What is Cloud Computing
Definition of Cloud Computing
On Premises Vs Service Models
Advantages and Disadvantages of Cloud Computing
Cloud Computing Providers
Why AWS
What is AWS
AWS Benefits
AWS Services
Traditional Vs AWS Components
AWS Global Infrastructure
AWS Availability Zone
AWS Edge Locations
How to Access the AWS Services
AWS architecture
AWS Management Console
AWS offerings Listing (EC2, VPC, AMI, EBS, ELB, Backup)

Amazon Elastic Compute Cloud (EC2)

Overview of EC2
Elastic IP Vs Public IP
Launching of AWS EC2 instance demo
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EC2 Purchasing Options
Amazon Machine Images (AMI)
EC2 Storage for the Root Device
EC2 Creating AMI
EC2 Instance Types
Auto Scaling
Cost of EC2
Best Practices of EC2
EC2 Resizing
Placement Groups
Amazon Backup and various Concepts
EC2 Demo
Hands On

Networking and Monitoring Services: Amazon Virtual Public Cloud

Virtual Private Cloud (VPC) and its benefits
Default and Non-Default VPC
IP Address
CIDR – Classless Inter-domain Routing
Subnet: Subnet Mask and Subnet Mask Classes
Private and Public Subnet
IPv4 v/s IPv6 – As in AWS Infrastructure
Internet Gateway and Route Tables
Security Group with VPC
Access Control List, NACL and Security Group
NAT Devices: NAT Gateway and NAT Instance
Flow Logs
VPC Peering and its working
VPN and Direct Connect
VPC Limitations
Need for Monitoring Services
AWS CloudWatch and it’s working
AWS Command Line Interface
Use Cases
Hands On

Amazon Storage Services: Elastic Block Storage

What is Storage Services
What is Elastic Block Storage (EBS)
Persistent Storage
EBC Features
EBS Benefits
EBS Types
EBS Pricing
EBS Life Cycle
EBS Snapshot
EBS General Purposed SSD
EBS Provisioned IOPS SSD
EBS Throughput Optimized HDD
EBS Cold HDD
EBS Comparison
EBS Previous Generation Volumes
EBS How Incremental Snapshots Work
EBS Deleting an Amazon EBS Snapshot
EBS Summary
Hands On

Amazon Storage Services: Simple Storage Services (S3)

What is Amazon AWS S3
Simple Storage Services (S3) Advantages
S3 Buckets, Objects, Keys and Endpoints
S3 Data Consistency Model
S3 Transfer Acceleration
S3 Storage Types
S3 Versioning
S3 Life Cycle Management
S3 Data Protection
S3 Cross-Region Replication
S3 Hosting a Static Website
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Amazon Storage Services

Amazon Glacier Storage
Amazon Storage Gateway
Amazon Snowball (Data Import /Export)
Billing with Amazon CloudWatch
Hands On

AWS Database Services: Relational Database Service (RDS)

Overview of Databases and Relational Database Service (RDS)
What is Amazon RDS
AWS RDS Components
AWS RDS: Interface
AWS RDS: Charges
AWS RDS Multi-AZ: Benefits
AWS RDS Multi-AZ: Failover Process
NoSQL Database: Amazon DynamoDB
Overview of DynamoDB
DynamoDB Benefits
Hands On

AWS Database Services Continued

Data Warehouse: Amazon Redshift
Overview of Amazon Redshift
Redshift Architecture
Amazon Redshift features
In Memory Cache: Amazon ElasticCache
Redis Vs MemCache
Amazon ElasticCache Cluster
Database Migration: AWS Database Migration Service

Load Balancing in AWS

What is Fault Tolerant System
Features of Elastic Load Balancing
What is AWS ELB (Elastic Load Balancer)
Types of Load Balancer: Classic, Application and Network
Classic Load Balancer: Features, Health Check Configuration, Cross-Zone, Connection Draining, Sticky Sessions, Access Logs, Limitation
Application Load Balancer: Features, Application Flow, Limitation
Network Load Balancer
Access Elastic Load Balancing: AWS Management Console, AWS CLI, AWS SDKs, HTTPS Query API

Amazon Route 53

What is Amazon Route 53
Domain Name Registration
Routing Internet Traffic to Resources
Automated check of the health of Resources + Data Pipeline

AWS Identity and Access Management (IAM) – Control user access

Authentication (Who can use) and Authorization (Level of Access)
IAM Policies – JSON Structure
Users, Groups and their Roles
AWS IAM Features
User Sign-in to Account
Switch Role
Role to EC2 Instance
Password Policy
How to Access AWS
Multi-Factor Authentication (MFA)
Permissions and Permission Types
Policies Structure
User Based Policies
Resource Based Policies
Resource Based Permission
Policies Types
Request Flow
Limitations
IAM HTTPS API
Logging IAM Events with AWS CloudTail
Hands On

Amazon CloudWatch

What is Amazon CloudWatch
Features and Benefits
CloudWatch Architecture
Hands On

AWS Auto Scaling

What is AWS Auto Scaling
Auto Scaling Components
Auto Scaling Group
Auto Scaling Launch Configuration
Auto Scaling Benefits
Auto Scaling Lifecycle
Auto Scaling Plans
Manual Scaling
Schedule Scaling
Dynamic Scaling
Auto Scaling Step Adjustment
Auto Scaling Termination Policy
Default Termination Policy
Health Check
Hands On

Amazon Application Services

Elastic BeanStalk
Simple Email Services (SES)
Simple Queue Service (SQS)
Simple Notification Services (SNS)
AWS Lambda
Introduction to Elastic OpWorks
Hands On

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