November 16, 2022

Top 20 AWS ECR Interview Questions and Answers

 

 

Developers can easily exchange and deploy container images and artefacts with Amazon ECR, a fully managed container registry. Your development to production process will be made simpler by Amazon ECR's integration with Amazon Elastic Container Service (Amazon ECS), Amazon Elastic Kubernetes Service (Amazon EKS), and AWS Lambda. Operating your own container repository and worrying about growing the underlying infrastructure are not necessary with Amazon ECR. You may deploy containers for your apps with confidence with Amazon ECR since it hosts your images in a highly available and scalable architecture. You may share photographs with everyone in the world or with other members of your business thanks to integration with AWS Identity and Access Management (IAM).

 

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Ques. 1): A worldwide service, is Amazon ECR?

Answer:

A regional service called Amazon ECR is meant to allow you freedom over how pictures are delivered. For optimal speed, you can upload and download images to the same AWS Region as your Docker cluster. Additionally, you may access Amazon ECR from any location where Docker is installed, including desktops and on-premises settings. Images pulled from other Regions or the internet will incur more delay and data transfer fees.

 

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Ques. 2): How can I organise my repositories and photos the best manner possible?

Answer:

In order to create, monitor, and remove repositories as well as modify repository permissions, Amazon ECR offers a command line interface and APIs. The same operations may be carried out in the Amazon ECR console by going to the "Repositories" section of the panel. You can publish, pull, and tag images via the Docker CLI using Amazon ECR, which is integrated with Docker.


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Ques. 3): Why need I to utilise Amazon ECR?

Answer:

The infrastructure needed to run and grow your container registry is no longer necessary thanks to Amazon ECR. You may deploy new containers for your applications with confidence by using Amazon ECR, which leverages Amazon Simple Storage Service (S3) for storage to make your container images highly available and accessible. Your container images are sent over HTTPS and automatically encrypted while they are at rest by Amazon ECR. Each repository's permissions may be managed by policies that limit access to IAM users, roles, or other AWS accounts. You may streamline your development and production operations by integrating Amazon ECR with Amazon ECS, Amazon EKS, AWS Fargate, AWS Lambda, and the Docker CLI. You can easily push your container images to Amazon ECR using the Docker CLI from your development machine, and Amazon container orchestrators or compute can pull them directly for production deployments.


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Ques. 4): Does AWS Elastic Beanstalk work with Amazon ECR?

Answer:

Yes. You may quickly deploy container images stored in Amazon ECR using AWS Elastic Beanstalk since it supports Amazon ECR for both single-container and multi-container Docker environments. You just need to apply the AmazonEC2ContainerRegistryReadOnly policy to your container instance role and provide the Amazon ECR repository in your Dockerrun.aws.json configuration.


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Ques. 5): How can Amazon ECR contribute to the safety of container images?

Answer:

When transferring your container images over HTTPS, Amazon ECR automatically encrypts the images at rest using either AWS KMS or Amazon S3 server-side encryption. Instead of managing credentials directly on your EC2 instances, you may set rules using AWS Identity and Access Management (IAM) users and roles to manage permissions and regulate access to your pictures.


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Ques. 6): Does Amazon ECR support any particular version of the Docker Image Manifest specification?

Answer:

The Docker Image Manifest V2, Schema 2 format is supported by Amazon ECR. Amazon ECR will continue to accept photos uploaded in the Schema 1 format to guarantee backwards compatibility with Schema 1 images. Additionally, when pulling with an older version of Docker Engine, Amazon ECR may down-translate from a Schema 2 to a Schema 1 image (1.9 and below).


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Ques. 7): Do Amazon ECR and Amazon ECS integrate well?

Answer:

Yes. Because Amazon ECR and Amazon ECS are connected, it's simple to store, execute, and manage container images for applications that use Amazon ECS. Amazon ECS will obtain the relevant images for your apps if you just provide the Amazon ECR repository in your task specification.


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Ques. 8): How do I pull a public image from Amazon ECR?

Answer:

You pull using the familiar ‘docker pull’ command with the URL of the image. You can easily search for this URL by finding images using a publisher alias, image name, or image description using the Amazon ECR public gallery. Image URLs are in the format public.ecr.aws/<alias>/<image>:<tag>, for example public.ecr.aws/eks/aws-alb-ingress-controller:v1.1.5


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Ques. 9): Does Amazon ECR check the security of container images?

Answer:

Your container images may be automatically scanned by Amazon ECR for a variety of operating system flaws. Additionally, you may scan photos by issuing an API call. When a scan is finished, Amazon ECR will alert you through API and on the console. You may activate Amazon Inspector for improved picture scanning.


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Ques. 10): Can public container images be hosted by Amazon ECR?

Answer:

Yes. You may publish or look for public container software with ease using the widely accessible container registry and website provided by Amazon ECR. Anyone with or without an AWS account may search and download frequently used container images, such as operating systems, AWS published images, and files, such as Helm charts for Kubernetes, from the Amazon ECR public gallery.


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Ques. 11): Can I create my own alias for my publicly visible images?

Answer:

Yes. Unless it's a reserved alias, you can request a bespoke alias such as your company or project name. Reserved names apply to AWS services. It's also possible to reserve names that identify AWS Marketplace vendors. Unless your request for a custom alias breaches the AWS Acceptable Use Policy or other AWS standards, we will examine and accept it within a few days.


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Ques. 12): What is AWS Identity and Access Management (IAM) and how can I use it for permissions?

Answer:

You can regulate and track who and what (such as EC2 instances) may access your container images, as well as how, when, and where they can do so, using IAM resource-based controls. To begin, define resource-based policies for your repositories using the AWS Management Console. The Amazon ECR CLI also allows you to utilise example rules and add them to your repositories.


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Ques. 13): The Open Container Initiative (OCI) format is supported by Amazon ECR?

Answer:

Yes. The Open Container Initiative (OCI) image specification is compatible with Amazon ECR, enabling you to push and pull OCI images and artefacts. On pull, OCI images, Schema 2 images, and Docker Image Manifest V2 images may all be translated via Amazon ECR.


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Ques. 14): What distinguishes public and private Amazon ECR repositories?

Answer:

Images cannot be fetched from a private repository because it lacks content search functionality and requires Amazon IAM-based verification using an AWS account. Anyone anywhere may extract photos from a public repository that provides descriptive information without the requirement for an AWS account or IAM credentials. The Amazon ECR public gallery also has photographs from the public repository.

 

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Ques. 15): How can I use Amazon ECR to publicly post an image?

Answer:

By logging into your AWS account and pushing to a public repository you establish, you may publish a picture to the Amazon ECR public gallery. All public photographs that you publish are given a special alias that you must use in image URLs.

 

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Ques. 16): Which compliance features are available on Amazon ECR?

Answer:

To give a history of all API operations, including who grabbed an image and when tags were transferred across pictures, you may use AWS CloudTrail on Amazon ECR. The EC2 instances that retrieved which photos are also visible to administrators.

 

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Ques. 17): Does federated access work with Amazon ECR?

Answer:

Yes. AWS Identity and Access Management (IAM), which allows identity federation for delegated access to the AWS Management Console or AWS APIs, is connected with Amazon ECR.

 

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Ques. 18): Can I use a VPC to access Amazon ECR?

Answer:

Yes. Instances may access pictures from your private repository without using the public internet by using AWS PrivateLink endpoints.

 

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Ques. 19): Do Amazon ECR images duplicate between AWS Regions?

Answer:

Yes. With Amazon ECR, you have freedom in where and how you store and distribute your photos. You may establish deployment pipelines that develop images and upload them to Amazon ECR in one Region. Amazon ECR will then duplicate those images automatically to other Regions and set up deployment to multi-Region clusters.

 

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Ques. 20): Will Amazon ECR generate images from a Dockerfile automatically?

Answer:

No. To give this capacity, Amazon ECR, however, connects with a variety of well-liked CI/CD programmes.

 

 

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