AWS CloudFormation is a configuration orchestration tool that lets
you define your infrastructure in order to automate deployments. CloudFormation
uses a declarative approach to configuration, which means you tell it how you
want your environment to look and it follows your instructions.
AWS(Amazon Web Services) Interview Questions and Answers
AWS CloudFormation is a service that assists you in modelling and
setting up your Amazon Web Services resources so you can spend less time
managing them and more time working on your AWS-based applications. You construct
a template that outlines all of the AWS resources you want (such as Amazon EC2
instances or Amazon RDS DB instances), and AWS CloudFormation handles
provisioning and configuration for you.
In addition to JSON, YAML may be used to generate CloudFormation templates. You may also use AWS CloudFormation Designer to graphically construct your templates and see how your resources are interconnected.
AWS Cloud Interview Questions and Answers
Ques. 1): Explain
the working model of CloudFormation.
Answer:
First,
we must code our infrastructure in a template, which is a YAML or JSON
text-based file.
Then
we use the AWS CloudFormation tool to write our code locally. Otherwise, we can
use the S3 bucket to store a YAML or JSON file.
Create
a stack based on our template code using the AWS CF GUI or the Command Line
Interface.
Finally, CloudFormation deploys resources, provisioned them, and configured the template we specified.
AWS RedShift Interview Questions and Answers
Ques. 2): Are there any restrictions on how many resources may be produced in a stack?
Answer:
See Resources in AWS CloudFormation quotas for more information on the number of resources you can define in a template. Smaller templates and stacks, as well as modularizing your application across multiple stacks, are best practises for reducing the blast radius of resource changes and troubleshooting issues with multiple resource dependencies faster, as smaller groups of resources have less complex dependencies than larger groups.
AWS Cloud Practitioner Essentials Questions and Answers
Ques. 3): Describe the features of AWS CloudFormation.
Answer:
By treating infrastructure as code, AWS CloudFormation makes it
simple to model a collection of connected AWS and third-party resources,
provision them rapidly and consistently, and manage them throughout their
lifecycles.
- Extensibility - Using the AWS CloudFormation CLI, an open-source tool that speeds the development process and includes local testing and code generation capabilities, you can create your own resource providers.
- Management of multiple accounts and regions - CloudFormation With a single CloudFormation template, you can provision a common set of AWS resources across many accounts and regions. StackSets takes care of provisioning, updating, and deleting stacks automatically and safely, no matter where they are.
- Authoring with JSON/YAML - CloudFormation allows you to model your whole cloud environment in text files using JSON/YAML. To define what AWS resources you wish to build and configure, you can use open-source declarative languages like JSON or YAML.
- Safety controls - CloudFormation automates and manages the provisioning and updating of your infrastructure. There are no manual controls or steps that could lead to mistakes.
- Dependency management - During stack management activities, AWS CloudFormation automatically maintains dependencies between your resources.
Ques. 4): What may AWS CloudFormation be used for by developers?
Answer:
Developers may use a simple, declarative language to deploy and
update compute, database, and many other resources, abstracting away the
complexities of specific resource APIs. AWS CloudFormation is designed to
manage resource lifecycles in a consistent, predictable, and secure manner,
including automatic rollbacks, state management, and resource management across
accounts and regions. Multiple ways to generate resources have been added
recently, including using the AWS CDK for higher-level languages, importing
existing resources, detecting configuration drift, and a new Registry that
makes it easy to construct unique types that inherit many basic CloudFormation
features.
Ques. 5): Is Amazon EC2 tagging supported by AWS CloudFormation?
Answer:
Yes. AWS templates can be labelled with Amazon EC2 resources that
support the tagging capability. Template parameters, other resource names,
resource attribute values (e.g. addresses), or values derived by simple
functions can all be used as tag values (e.g., a concatenated a list of
strings). CloudFormation automatically assigns the name of the CloudFormation
stack to Amazon EBS volumes and Amazon EC2 instances.
Ques. 6): In AWS
CloudFormation, what is a circular dependency? What can be done about it?
Answer:
An
interleaved reliance exists between two resources.
Resource
X relies on Resource Y, and Resource Y relies on Resource X.
Because
AWS CloudFormation is unable to clearly establish which resource should be
produced first in this circumstance, you will receive a circular dependency
error.
Interactions
between services that make them mutually dependent can produce the AWS
CloudFormation circular dependence.
Because
AWS CloudFormation is unable to properly decide which resource should be
produced first when two are reliant on one another, we will receive a circular
dependency error.
The first step is to look
over the resources listed and ensure that AWS CloudFormation can figure out
what resource order to use.
Add a DependsOn attribute
to resources that depend on other resources in your template to fix a
dependency error.
We can use DependsOn to express that a particular resource must be produced before another.
AWS Simple Storage Service (S3) Interview Questions and Answers
Ques. 7): What is the difference between a resource and a module?
Answer:
A Resource Type is a code
package that contains provisioning logic and allows you to manage the lifecycle
of a resource, such as an Amazon EC2 Instance or an Amazon DynamoDB Table, from
creation to deletion while abstracting away difficult API interactions.
Resource Types include a schema that defines a resource's shape and properties,
as well as the logic required to supply, update, delete, and describe it. A
Datadog monitor, MongoDB Atlas Project, or Atlassian Opsgenie User are examples
of third-party Resource Types in the CloudFormation Public Registry.
Modules are reusable building elements that can be used in
numerous CloudFormation templates and are treated similarly to native
CloudFormation resources. These building blocks can be used to create common
patterns of application design for a single resource, such as best practises for
defining an Amazon Elastic Compute Cloud (Amazon EC2) instance, or several
resources.
Ques. 8): Is there a list of sample templates I can use to get a
feel for AWS CloudFormation?
Answer:
Yes, CloudFormation includes sample templates that you may use to
try out the service and learn more about its features. Our sample templates
show how to connect and use numerous AWS resources simultaneously while
adhering to best practises for multiple Availability Zone redundancy, scaling
out, and alarming. To get started, simply go to the AWS Management Console,
click Create Stack, and follow the instructions to choose and run one of our
samples. Select your stack in the console after it has been generated and look
at the Template and Parameter tabs to see the details of the template file that
was used to create the stack. On GitHub, there are also some sample templates.
Ques. 9): What distinguishes AWS CloudFormation from AWS Elastic
Beanstalk?
Answer:
AWS CloudFormation allows you to provision and describe all of
your cloud environment's infrastructure resources. AWS Elastic Beanstalk, on
the other hand, provides an environment that makes it simple to deploy and run
cloud applications.
AWS CloudFormation caters to the infrastructure requirements of a
wide range of applications, including legacy and existing business
applications. AWS Elastic Beanstalk, on the other hand, is used in conjunction
with developer tools to assist you manage the lifespan of your applications.
Ques. 10): What happens if one of the resources in a stack is
unable to be created?
Answer:
The automatic rollback on error option is enabled by default. If
all individual operations succeed, CloudFormation will only construct or update
all resources in your stack. If they don't, CloudFormation resets the stack to
its last known stable state.
For example, if you mistakenly exceeded your Elastic IP address
limit, or if you don't have access to an EC2 AMI you're trying to execute. This
functionality allows you to rely on the fact that stacks are constructed
completely or partially, making system administration and layered solutions
built on top of CloudFormation easier.
Ques. 11): What makes AWS different from third-party resource
providers?
The origin of AWS and third-party resource providers is the key
distinction. Amazon and AWS create and maintain AWS resource providers to
manage AWS resources and services. Three AWS resource providers, for example,
assist you in managing Amazon DynamoDB, AWS Lambda, and Amazon EC2 resources.
AWS::DynamoDB::Table, AWS::Lambda::Function, and AWS::EC2::Instance are among
the resource types available through these providers. Visit our documentation
for a complete list of references.
Another corporation, organisation, or developer community creates
third-party resource providers. They can assist you in managing AWS and non-AWS
resources, such as AWS application resources and non-AWS SaaS software services
like monitoring, team productivity, issue management, or version control
management tools.
Ques. 12): How does AWS Cloud Pipeline interact with
CloudFormation?
Answer:
You can use AWS CodePipeline to trigger a Cloud Formation template
to run in the deployment phase.
The pipeline has following stages:
Source phase: Fetch the latest commit.
Build phase: Build the code into a docker image and push it to
ECR.
Deploy phase: Take the latest docker image from ECR, deploy it to
ECS
Ques. 13): On top
of CloudFormation, what does AWS Serverless Application Model offer?
Answer:
The
AWS Serverless Application Model is an open-source architecture for creating
serverless apps on Amazon Web Services.
AWS
SAM includes a template for defining serverless applications.
AWS
CloudFormation allows you to design a template that describes your
application's resources and manages the stack as a whole.
You
construct a template that outlines all of the AWS resources you need, and AWS
CloudFormation handles the rest of the provisioning and configuration.
AWS
SAM is a template language extension for AWS CloudFormation that allows you to
design serverless AWS Lambda apps at a higher level.
It
aids CloudFormation in the setup and deployment of serverless applications.
It
automates common tasks such as function role creation, and makes it easier to
write CloudFormation templates for your serverless applications.
Ques. 14): What
is the Public Registry for AWS CloudFormation?
Answer:
The CloudFormation Public Registry is a new searchable and maintained catalogue
of extensions that includes resource types (provisioning logic) and modules
provided by APN Partners and the developer community. Anyone can now publish
resource types and Modules on the CloudFormation Public Registry. Customers may
quickly find and use these public resource types and modules, which eliminates
the need for them to construct and maintain them themselves.
Ques. 15): What is the relationship between the CloudFormation
Public Registry and the CloudFormation Registry?
Answer:
When the CloudFormation Registry first launched in November 2019,
it had a private listing that allowed customers to customise CloudFormation for
their own use. The Public Registry adds a public, searchable, single
destination for sharing, finding, consuming, and managing Resource Types and
Modules to the CloudFormation Registry, making it even easier to create and
manage infrastructure and applications for both AWS and third-party products.
Ques. 16): Is it possible to handle individual AWS resources
within an AWS CloudFormation stack?
Answer:
Yes, you certainly can. CloudFormation does not get in the way;
you keep complete control over all aspects of your infrastructure and can
continue to manage your AWS resources with all of your existing AWS and
third-party tools. We advocate using CloudFormation to manage the modifications
to your resources because it can allow for extra rules, best practises, and
compliance controls. This method of managing hundreds or thousands of resources
across your application portfolio is predictable and regulated.
Ques. 17): What is the Cost of AWS CloudFormation?
Answer:
Using AWS CloudFormation with resource providers in the AWS::*,
Alexa::*, and Custom::* namespaces incurs no additional cost. In this case, you
pay the same as if you had manually established AWS resources (such as Amazon
EC2 instances, Elastic Load Balancing load balancers, and so on). There are no
minimum payments or needed upfront commitments; you only pay for what you use,
when you use it.
You will be charged each handler operation if you use resource
providers with AWS CloudFormation outside of the namespaces listed above.
Create, update, delete, read, or list activities on a resource are handled by
handler operations.
Ques. 18): In a Virtual Private Cloud (VPC), can I create stacks?
Answer:
Yes. VPCs, subnets, gateways, route tables, and network ACLs may
all be created with CloudFormation, as well as resources like elastic IPs,
Amazon EC2 instances, EC2 security groups, auto scaling groups, elastic load
balancers, Amazon RDS database instances, and Amazon RDS security groups.
Ques. 19): Is
there a limit on how many templates or layers you can have?
Answer:
See Stacks in AWS CloudFormation quotas for more information on the maximum number of AWS CloudFormation stacks you can construct. Fill out this form to request a higher limit, and we'll get back to you within two business days.
AWS Database Interview Questions and Answers
Ques. 20): Do I have access to the Amazon EC2 instance or the user-data fields in the Auto Scaling Launch Configuration?
Answer:
Yes.
Simple functions can be used to concatenate string literals and AWS resource
attribute values and feed them to user-data fields in your template. Please see
our sample templates for more information on these simple functions.
AWS
AppSync Interview Questions and Answers
AWS Cloud9 Interview Questions and Answers
Amazon
Athena Interview Questions and Answers
AWS Cloud Support Engineer Interview Question and Answers
AWS VPC Interview Questions and
Answers
AWS GuardDuty Questions and Answers
AWS Control Tower Interview Questions and Answers
AWS Lake Formation Interview Questions and Answers
AWS Data Pipeline Interview Questions and Answers
Amazon
CloudSearch Interview Questions and Answers
AWS Transit Gateway Interview Questions and Answers
Amazon
Detective Interview Questions and Answers
Amazon
EMR Interview Questions and Answers
Amazon
OpenSearch Interview Questions and Answers
No comments:
Post a Comment