AWS is a cloud computing platform that offers users a wide range of services, including storage, computing, and networking. It is one of the most popular cloud platforms on the market, and its popularity is only increasing as more businesses move to the cloud.
AWS is becoming a major focus of DevOps engineer jobs worldwide, and EPAM Anywhere is no exception to that trend. For anyone looking to prepare for AWS DevOps interview questions, we offer 20 essential questions and answers provided by EPAM Anywhere’s Certified DevOps Technical Interviewer, Systems Engineering Team Leader, Santiago Castellanos.
When asked this question, I always like to name the main reasons promoted by AWS itself. Many of these reasons are consistent with DevOps culture and its underlying principles:
All of this allows the DevOps culture to be fully adapted to a cloud provider like AWS, while also enabling companies to build products faster and more reliably by hiring DevOps engineers skilled in this provider's services.
Each of the AWS services are designed to work based on the DevOps culture. But I think that the most important to highlight are those that allow a robust CI/CD system to exist, including: AWS CodePipeline, AWS CodeBuild, AWS CodeDeploy, and AWS CodeStar.
AWS CodePipeline is a fully managed CI/CD service that enables you to automate release pipelines for fast and reliable application and infrastructure updates.
AWS CodeBuild provides preconfigured environments for supported versions of Java, Ruby, Python, Go, Node.js, Android, .NET Core, PHP, and Docker. You can create and upload a Docker image to the Amazon EC2 Container Registry or the Docker hub registry to customize your environment, and later reference this custom image in your build project.
The most common case is when you have a microservice that you want to deploy in an environment without any prior provisioning. You can achieve this by creating a Docker image of the microservice and saving it in an image registry, such as the Elastic Container Registry (ECR) which can later be used in a Task Definition. Using technologies such as Fargate, you can then deploy this in an ECS cluster.
An Amazon Machine Image (AMI) is an image supported and maintained by AWS that delivers the information needed to launch an instance.
IaC is the management of the infrastructure (networks, virtual machines, load balancers, and connection topology) in a descriptive model, using the same version control that the DevOps team uses for source code. This makes it replicable and consistent.
There are three ways containers can communicate with each other:
Personally, I prefer Git, but it’s fine if yours is different. Just be sure to follow up by mentioning the key reasons and advantages of your choice.
The goal of DevOps is to improve communication and collaboration between large teams who are responsible for developing software. This approach differs from that used in Agile, where small collaborating groups work together on adapting quickly as changes occur during the development process.
One key difference lies within how each side approaches a task. While Agile focuses mostly on getting things done, the main concern of DevOps includes communicating and connecting so people can learn from each other.
We can define the DevOps life cycle in eight simple words:
CloudFormation is mainly an infrastructure-as-code (IaC) service that allows you to easily model, provision, and manage AWS resources. Beanstalk, on the other hand, is more focused on application deployment; helping users avoid all the configuration issues that result from interacting with each service individually.
One best practice is that application security must be fully automated to keep pace with dynamic clouds and rapid software development practices. Another is that application security must be comprehensive in scope. A third best practice is that application security must provide accurate and insightful information, not just partial data.
There are several ways, but the best option when dealing with AWS would be to make use of the CloudFormation service, which is dedicated to writing infrastructure as code. There are also other options that are pretty good and worth considering if we have multi-model clouds, such as Terraform or Pulumi. I prefer the use of Terraform over CloudFormation.
Terraform is a tool from Hashicorp, and CloudFormation is from AWS. When comparing the two, it’s important to realize that, unlike Terraform, CloudFormation is not open source and it follows a roadmap of features set by Amazon. Terraform is cloud-agnostic. It provides users with quite a bit of flexibility and Terraform can be used for any type of resource that can be interacted with via API.
It is possible to use all configuration management technologies with AWS, but the only ones that have dedicated services are Chef and Puppet, which come bundled with AWS OpsWork.
It is important to gather all of the requirements for the pipeline that is going to be created. Talk with the development teams in the case of an application or, in other cases, with the team that requires the functionality, to define how the pipeline is going to be divided and which tools are needed to make it work. Initially, it is important to try to replicate as much of the pipeline as possible locally, so that later you can automate the process. Finally do several tests to ensure that the workflow concept will actually work.
Buffer helps to synchronize different components, it receives requests and processes them asynchronously. It manages the balance between various components to maintain speed and provide faster service. In AWS, buffering also ensures efficiency over traffic or load.
If you want an implementation with a lot of flexibility, greater scalability, and simplicity, it is better to use ECS.
Mainly that the operational load is reduced considerably due to the simplicity behind the microservices and the ease of replacing them in a matter of minutes.
There are several things that I consider really important at the time of an interview:
If you’re looking for a career in DevOps, check out open jobs at EPAM Anywhere. We can help you take the next step in your career.