Mphasis AWS Devops Engineer Interview Questions and Answers

Q1. If i delete an instance on the console and then i deploy the same instance terraform template how will terraform behave?
Ans. 
Terraform will recreate the instance as per the template
• Terraform will detect that the instance is missing and recreate it based on the template

• The new instance will have the same configuration as defined in the template

• Any changes made to the instance outside of Terraform will be lost
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Q2. If i have an instance configuration terraform template, and i manually add an ebs to it through console and then give terraform apply how will terraform behave?
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Q3. What will be the IP range if i need 500 IPs?
Ans. 
The IP range for 500 IPs would typically be a /23 subnet.
• For 500 IPs, you would need at least a /23 subnet.

• A /23 subnet provides 512 IP addresses (2^9 = 512), with 510 usable IPs after subtracting network and broadcast addresses.

• The IP range for a /23 subnet would be from x.x.x.0 to x.x.x.255.
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Q4. Python coding on string manipulation
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Q5. What are the health checks after creating instances - 2/2? What do they mean?
Ans. 
Health checks after creating instances ensure the instances are functioning properly.
• Instance status checks ensure the instance is reachable and responding to traffic.

• System status checks ensure the underlying hardware is functioning properly.

• Example: If an instance fails the system status check, it may indicate a problem with the underlying host hardware.
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Q6. How to deploy microservices?
Ans. 
Microservices can be deployed using containerization tools like Docker and orchestration tools like Kubernetes.
• Use containerization tools like Docker to package each microservice along with its dependencies into a container image.

• Leverage orchestration tools like Kubernetes to manage and deploy multiple microservices across a cluster of machines.

• Implement continuous integration and continuous deployment (CI/CD) pipelin...read more
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Q7. Write terraform code to launch an ec2 instance in a vpc and attach a role to it
Ans. 
Launch an EC2 instance in a VPC and attach a role using Terraform
• Define a VPC resource in Terraform

• Define a subnet resource within the VPC

• Create a security group for the EC2 instance

• Define an IAM role for the EC2 instance

• Launch an EC2 instance within the subnet and attach the IAM role
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Q1. Day to day activities
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Q2. Why do you learn various technologies?
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Q3. How will it be beneficial for you to learn various technologies because you will be working with limited technologies?
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Q4. Your project workflow, and how do you manage your tasks
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Q1. Share Your experience on Creating AWS resources. GUI or using IAC tool?
Ans. 
I primarily use IAC tools like Terraform to create AWS resources for consistency, version control, and automation.
• I prefer using IAC tools like Terraform for creating AWS resources as it allows for infrastructure as code, version control, and automation.

• Using IAC tools ensures consistency in resource creation across environments.

• GUI can be useful for quick prototyping or exploring AWS services, but IAC is more efficien...read more
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Q2. Have you got any issues in pod, while creating or monitoring pods in the kubernetes cluster?
Ans. 
Yes, I have faced issues while creating or monitoring pods in a Kubernetes cluster.
• One common issue is pods getting stuck in a pending state due to resource constraints or scheduling issues.

• Another issue is pods crashing frequently due to misconfigured settings or incompatible container images.

• Monitoring pods can be challenging, especially when dealing with a large number of pods and trying to track their health and pe...read more
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Q3. What are use of Versioning in S3? Have you got any issues in working using S3?
Ans. 
Versioning in S3 allows for preserving, retrieving, and restoring every version of an object stored in a bucket.
• Enables recovery from unintended user actions or application failures

• Helps in maintaining different versions of objects for audit or compliance purposes

• Prevents accidental deletion or overwriting of objects

• Useful for tracking changes and rolling back to previous versions if needed
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Q4. What are the Devops tools, you have experience on?
Ans. 
I have experience with various DevOps tools including Jenkins, Docker, Ansible, and Terraform.
• Jenkins

• Docker

• Ansible

• Terraform
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Q1. What is docker attached and detached mode how to get out of docker exec without closing the terminal of docker exec
Ans. 
Docker attached mode runs a container in the foreground, while detached mode runs it in the background.
• In attached mode, you can see the container's output in the terminal where it was started.

• In detached mode, the container runs in the background and you can continue using the terminal.

• To exit a Docker exec session without closing the terminal, press Ctrl + P, Ctrl + Q.

• You can also use the command 'exit' or 'Ctrl + D'
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How aws vs verulation.

Q1. Nacl vs security group?
Ans. 
Nacl is a stateless firewall while security group is a stateful firewall in AWS.
• NACL operates at the subnet level, while security groups operate at the instance level.

• NACL rules are evaluated in order, while security group rules are evaluated independently.

• NACLs are stateless, meaning you must create rules for both inbound and outbound traffic, while security groups are stateful.

• NACLs are more flexible in terms of allo...read more
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Q2. Aws cloudformation
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Q1. Reason for change
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Q2. Salary discuss how much excellent
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Q1. How to give access of s3 bucket to user in a secure way?
Ans. 
Grant access to S3 bucket securely by using IAM policies and roles.
• Create an IAM policy with specific permissions for the S3 bucket

• Attach the IAM policy to an IAM role

• Assign the IAM role to the user or group that needs access

• Use bucket policies for more granular control if needed
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Q2. Difference between iam role and iam group?
Ans. 
IAM role is used to grant permissions to entities, while IAM group is used to group users with similar permissions.
• IAM role is used to delegate permissions to entities like EC2 instances or Lambda functions

• IAM group is used to group users with similar permissions for easier management

• IAM role can be assumed by trusted entities, while IAM group is used for managing user permissions
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