AWS Elastic Beanstalk allows an user to quickly deploy and manage applications in the AWS Cloud without worrying about the infrastructure that runs those applications.
AWS Elastic Beanstalk reduces management complexity without restricting choice or control.
AWS Elastic Beanstalk enables automated infrastructure management and code deployment, by simply uploading, for applications and includes
Application platform management
Once an application is uploaded, Elastic Beanstalk automatically launches an environment and creates and configures the AWS resources needed to run the code. After your environment is launched, it can be managed and used to deploy new application versions
AWS resources launched by Elastic Beanstalk are fully accessible i.e. you can ssh into the EC2 instances
Elastic Beanstalk provides developers and systems administrators an easy, fast way to deploy and manage their applications without having to worry about AWS infrastructure.
CloudFormation, using templates, is a better option if the internal AWS resources to be used are known
Elastic Beanstalk Components
An Elastic Beanstalk application is a logical collection of Elastic Beanstalk components, including environments, versions, and environment configurations.
An application version refers to a specific, labeled iteration of deployable code for a web application
Applications can have many versions and each application version is unique and points to an S3 object
Multiple versions can be deployed for an Application for testing differences and helps rollback to any version if case of issues
An environment is a version that is deployed onto AWS resources
An environment runs a single application version at a time, but same application version can be deployed across multiple environments
When an environment is created, Elastic Beanstalk provisions the resources needed to run the application version you specified.
An environment configuration identifies a collection of parameters and settings that define how an environment and its associated resources behave
When an environment’s configuration settings is updated, Elastic Beanstalk automatically applies the changes to existing resources or deletes and deploys new resources, depending upon the change
A configuration template is a starting point for creating unique environment configurations
Elastic Beanstalk Architecture
Elastic Beanstalk environment requires an environment tier, platform, and
Environment tier determines whether Elastic Beanstalk provisions resources to support a web application that handles HTTP(S) requests or a web application that handles background-processing tasks
Web Environment Tier
An environment tier whose web application processes web requests is known as a web server tier.
AWS resources created for a web environment tier include a Elastic Load Balancer, an Auto Scaling group, one or more EC2 instances
Every Environment has a CNAME url pointing to the ELB, aliased in Route 53 to ELB url
Each EC2 server instance that runs the application uses a container type, which defines the infrastructure topology and software stack
A software component called the host manager (HM) runs on each EC2 server instance and is responsible for
Deploying the application
Aggregating events and metrics for retrieval via the console, the API, or the command line
Generating instance-level events
Monitoring the application log files for critical errors
Monitoring the application server
Patching instance components
Rotating your application’s log files and publishing them to S3
Worker Environment Tier
An environment tier whose web application runs background jobs is known as a worker tier
AWS resources created for a worker environment tier include an Auto Scaling group, one or more Amazon EC2 instances, and an IAM role.
For the worker environment tier, Elastic Beanstalk also creates and provisions an Amazon SQS queue if you don’t already have one
When a worker environment tier is launched, Elastic Beanstalk installs the necessary support files for the programming language of choice and a daemon on each EC2 instance in the Auto Scaling group reading from the same SQS queue
Daemon is responsible for pulling requests from an Amazon SQS queue and then sending the data to the web application running in the worker environment tier that will process those messages
One environment cannot support two different environment tiers because each requires its own set of resources; a worker environment tier and a web server environment tier each require an Auto Scaling group, but Elastic Beanstalk supports only one Auto Scaling group per environment.
Elastic Beanstalk with other AWS Services
Elastic Beanstalk supports VPC and launches AWS resources, such as instances, into the VPC
Elastic Beanstalk supports IAM and helps you securely control access to your AWS resources.
CloudFront can be used to distribute the content in S3, after an Elastic Beanstalk is created and deployed
Elastic Beanstalk is integrated with CloudTrail, a service that captures all of the Elastic BeanstalkAPI calls and delivers the log files to an S3 bucket that you specify.
CloudTrail captures API calls from the Elastic Beanstalk console or from your code to the Elastic Beanstalk APIs and help to determine the request made to Elastic Beanstalk, the source IP address from which the request was made, who made the request, when it was made etc.
Elastic Beanstalk provides support for running RDS instances in the Elastic Beanstalk environment which is ideal for development and testing but not for production.
For a production environment, it is not recommended because it ties the lifecycle of the database instance to the lifecycle of application’s environment. So it the Elastic beanstalk environment is deleted, the RDS instance is deleted as well
It is recommended to launch a database instance outside of the environment and configure the application to connect to it outside of the functionality provided by Elastic Beanstalk.
Using a database instance external to your environment requires additional security group and connection string configuration, but it also lets the application connect to the database from multiple environments, use database types not supported with integrated databases, perform blue/green deployments, and tear down your environment without affecting the database instance.
Elastic Beanstalk creates an S3 bucket named elasticbeanstalk-region-account-id for each region in which environments is created.
Elastic Beanstalk uses the bucket to store application versions, logs, and other supporting files.
It applies a bucket policy to buckets it creates to allow environments to write to the bucket and prevent accidental deletion
AWS Certification Exam Practice Questions
Questions are collected from Internet and the answers are marked as per my knowledge and understanding (which might differ with yours).
AWS services are updated everyday and both the answers and questions might be outdated soon, so research accordingly.
AWS exam questions are not updated to keep up the pace with AWS updates, so even if the underlying feature has changed the question might not be updated
Open to further feedback, discussion and correction.
An organization is planning to use AWS for their production roll out. The organization wants to implement automation for deployment such that it will automatically create a LAMP stack, download the latest PHP installable from S3 and setup the ELB. Which of the below mentioned AWS services meets the requirement for making an orderly deployment of the software?
AWS Elastic Beanstalk
What does Amazon Elastic Beanstalk provide?
A scalable storage appliance on top of Amazon Web Services.
An application container on top of Amazon Web Services
A service by this name doesn’t exist.
A scalable cluster of EC2 instances.
A .NET application that you manage is running in Elastic Beanstalk. Your developers tell you they will need access to application log files to debug issues that arise. The infrastructure will scale up and down. How can you ensure the developers will be able to access only the log files?
Access the log files directly from Elastic Beanstalk
Enable log file rotation to S3 within the Elastic Beanstalk configuration
Ask your developers to enable log file rotation in the applications web.config file
Connect to each Instance launched by Elastic Beanstalk and create a Windows Scheduled task to rotate the log files to S3
Your team has a tomcat-based Java application you need to deploy into development, test and production environments. After some research, you opt to use Elastic Beanstalk due to its tight integration with your developer tools and RDS due to its ease of management. Your QA team lead points out that you need to roll a sanitized set of production data into your environment on a nightly basis. Similarly, other software teams in your org want access to that same restored data via their EC2 instances in your VPC .The optimal setup for persistence and security that meets the above requirements would be the following.
Create your RDS instance as part of your Elastic Beanstalk definition and alter its security group to allow access to it from hosts in your application subnets. (Not optimal for persistence as the RDS is associated with the Elastic Beanstalk lifecycle and would not live independently)
Create your RDS instance separately and add its IP address to your application’s DB connection strings in your code. Alter its security group to allow access to it from hosts within your VPC’s IP address block. (RDS is connected using DNS endpoint only)
Create your RDS instance separately and pass its DNS name to your app’s DB connection string as an environment variable. Create a security group for client machines and add it as a valid source for DB traffic to the security group of the RDS instance itself. (Security group allows instances to access the RDS with new instances launched without any changes)
Create your RDS instance separately and pass its DNS name to your DB connection string as an environment variable. Alter its security group to allow access to it from hosts in your application subnets. (Not optimal for security adding individual hosts)