March 25, 2023

Top 20 AWS CodeDeploy Interview Questions and Answers


                Software deployments to multiple compute services, including Amazon Elastic Compute Cloud (EC2), Amazon Elastic Container Service (ECS), AWS Lambda, and your on-premises servers, are automated via the completely managed deployment solution AWS CodeDeploy. By automating software deployments with CodeDeploy, human, prone to error processes are no longer necessary.


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Ques. 1): With AWS CodeDeploy, what kinds of apps may be deployed?

Answer:

Any kind of programme can be deployed with AWS CodeDeploy. The files to copy and the scripts to run on each instance during the deployment are specified when using AWS CodeDeploy. Because AWS CodeDeploy supports any custom deployment logic, regardless of the programming language or architecture used, scripts can be used.


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Ques. 2): What platforms is AWS CodeDeploy compatible with?

Answer:

Numerous different operating systems are supported by AWS CodeDeploy. Agents are available from AWS CodeDeploy that have been tried out on Red Hat Enterprise Linux, Amazon Linux, Ubuntu Server, and Microsoft Windows Server. The AWS CodeDeploy agent is free source software, so you can use it with other operating systems.


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Ques. 3): What exactly is AWS CodeDeploy?

Answer:

AWS CodeDeploy is a service that automates the deployment of code to any instance, including instances hosted on-premises and in Amazon EC2. You can deliver new features more quickly, avoid downtime during deployment, and handle the complexity of updating your apps with AWS CodeDeploy. By automating deployments, AWS CodeDeploy eliminates the need for labor-intensive manual processes. The service scales with your infrastructure, allowing you to quickly deploy to one instance or thousands.


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Ques. 4): What distinguishes Amazon CodeDeploy from other AWS management and deployment tools like AWS Elastic Beanstalk and AWS OpsWorks?

Answer:

AWS CodeDeploy is a building block tool designed to assist developers in deploying and updating software on any instance, including instances running on-premises and through Amazon EC2. End-to-end application management solutions are provided by AWS Elastic Beanstalk and AWS OpsWorks.


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Ques. 5): What is a deployment group?

Answer:

The AWS CodeDeploy entity for grouping EC2 instances or AWS Lambda functions in a CodeDeploy deployment is called a deployment group. You target a set of instances connected to an application while using EC2 for deployments. By naming an Auto Scaling group, a tag, or both, you can add instances to a deployment group. In an Amazon Lambda deployment, a deployment group specifies a set of AWS CodeDeploy configurations, such as alarms and rollbacks, for upcoming serverless Lambda deployment to the group.

An application can have numerous deployment groups, such as staging and production. See Dealing with Amazon EC2 Tags in the Console for more details on tags.


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Ques. 6): What are the typical processes involved in utilising AWS CodeDeploy to launch an application?

Answer:

The common steps taken during a deployment are depicted in the diagram below. The first setup step for each application is often creating an application and a deployment group (for definitions of these words, see the Concepts section). Uploading a revision and deploying it are repeatable tasks.


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Ques. 7): How can I use AWS CodeDeploy to deploy an application from my source control system?

Answer:

If you use GitHub, you can publish a revision from your repository straight to instances in.zip,.tar, or.tar.gz format. When deploying code from other source control systems, you can provide the Amazon S3 location and bundle the revision and upload it to an Amazon S3 bucket in a.tar.gz,.zip, or.tar.xz format. Make sure the post-build artefacts are present in the GitHub repository or the Amazon S3 bucket if your application requires a build phase.


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Ques. 8): How does Auto Scaling integrate with AWS CodeDeploy?

Answer:

To guarantee that freshly started instances always receive the most recent version of your application, you can join an Auto Scaling group with a deployment group. Each time an Amazon EC2 instance for that Auto Scaling group is launched, it is first placed in a Pending state before the deployment of the most recent successful revision for that deployment group is triggered on that Amazon EC2 instance. The Amazon EC2 instance's state is updated to InService if the deployment is successful. A new Amazon EC2 instance is launched in the Pending state and a deployment is initiated for the newly launched EC2 instance if the deployment fails.


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Ques. 9): Can I manage access to AWS CodeDeploy using AWS Identity and Access Management (IAM)?

Answer:

Yes. Resource-level permissions are supported by AWS CodeDeploy. You can select which user has access and to what actions for each AWS CodeDeploy resource. For instance, you can configure an IAM policy to only allow users to list revisions for other apps while allowing users to install a specific application. Hence, you may stop users from unintentionally changing the incorrect programme.


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Ques. 10): How are AWS CodeDeploy applications distributed across many regions?

Answer:

When performing deployments, AWS CodeDeploy uses AWS resources in the same area. Create the application in each of your target locations, copy the application bundle to an Amazon S3 bucket there, and then begin the deployments using either a serial or parallel rollout across the regions to spread the deployments out.


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Ques. 11): Can my current tool chain work with AWS CodeDeploy?

Answer:

Yes. Many configuration management, continuous integration, and deployment, as well as source control solutions are compatible with AWS CodeDeploy.


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Ques. 12): How do revisions work?

Answer:

A revision is a particular version of deployable material, which includes an AppSpec file, source code, post-build artefacts, web pages, executable files, and deployment scripts. A revision can be accessed via the AWS CodeDeploy Agent from GitHub or an Amazon S3 bucket.


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Ques. 13): What is a deployment configuration?

Answer:

A deployment configuration outlines the actions that should be taken during deployment, including how to deal with failure, through the use of a deployment group. To deploy with zero downtime to multi-instance deployment groups, you can utilise a deployment configuration. You can define this in your deployment configuration, for instance, if your application requires at least 50% of the instances in a deployment group to be active and handling traffic, preventing downtime from a deployment. Amazon CodeDeploy will deploy to one instance at a time by default if no deployment setting is linked to either the deployment or the deployment group.


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Ques. 14): How will my configuration management tool and AWS CodeDeploy interact?

Answer:

Your configuration management tool can be launched from any AppSpec file deployment lifecycle event hook. For instance, you can define a Chef recipe that you wish to execute as part of a deployment in the relevant AppSpec file deployment lifecycle event hook. The AWS CodeDeploy agent can also be installed on instances using your configuration management tool. for examples that demonstrate integrating configuration management tools like Chef, Puppet, Ansible, and Saltstack with AWS CodeDeploy.


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Ques. 15): How can I keep track of a deployment's progress?

Answer:

The Amazon Management Console, AWS Command Line Interface (AWS CLI), AWS SDKs, and AWS CodeDeploy APIs can all be used to monitor the progress of a deployment.

You may view the general deployment status and then drill down to view the status of every instance and every deployment lifecycle event for the instance. Also, you can examine the log entries associated with every failure, which makes it simple to troubleshoot deployment difficulties without logging into the instance.


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Ques. 16): How can I get notified or alerted when something happens in AWS CodeDeploy?

Answer:

Events that affect your deployments can have notifications created for them. Amazon SNS notifications will be used for notifications. Each notification will have a link to the resources whose event caused it, along with a status message. There is no additional price for notifications, but you can be charged for other AWS services that notifications uses, including Amazon SNS. Consult the alerts user guide to understand how to get started. Customers can also set up notifications to go to their Slack channels or Amazon Chime chat rooms when utilising the AWS Chatbot.


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Ques. 17): An application is what?

Answer:

A group of instances can be served by deploying an application, which is a bundle of software and configuration. The instances in the group often use the same programme. For instance, if you have a sizable distributed system, it's likely that the web layer will be one application and the data tier will be another.


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Ques. 18): What is an AppSpec file?

Answer:

An AppSpec file is a configuration file that details the scripts to run and the files to copy. You place the YAML-formatted AppSpec file in the root directory of your revision. The AppSpec file has two sections and is used by the Amazon CodeDeploy Agent. The source files in your revision that will be copied as well as the final destination folder are specified in the files section for each instance. The location of the scripts to run during each stage of the deployment is specified in the hooks section as relative paths beginning at the revision bundle's root. A deployment lifecycle event is the name given to each stage of a deployment.


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Ques. 19): What modifications must I make to my code before using AWS CodeDeploy?

Answer:

Your code doesn't require any modifications. You only include a configuration file (known as an AppSpec file) in the revision bundle's root directory that lists the files to copy and the scripts to run.


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Ques. 20): How can I restore a previously revised application?

Answer:

You only need to deploy the prior revision in order to roll back an application to it. There is no distinction between redeploy and roll back because AWS CodeDeploy keeps track of the files that were copied for the current version and deletes them before beginning a new deployment. You must, however, confirm that it is possible to roll back the prior updates.


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