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10+ Rapyder Cloud Solutions AWS Devops Engineer Interview Questions and Answers

Updated 5 Feb 2024

Q1. how do you troubleshoot a docker container that is going to die?

Ans.

To troubleshoot a dying docker container, we can use logs, inspect the container, and check resource usage.

  • Check container logs using 'docker logs ' command

  • Inspect the container using 'docker inspect ' command to check its status and configuration

  • Check resource usage using 'docker stats ' command to see if it's running out of memory or CPU

  • Restart the container using 'docker restart ' command if necessary

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Q2. how do you take a backup of Linux logs to was S3 bucket?

Ans.

Use AWS CLI to sync Linux logs to S3 bucket

  • Install AWS CLI on the Linux machine

  • Create an S3 bucket and configure IAM role with S3 permissions

  • Use AWS CLI command 'aws s3 sync' to sync logs to S3 bucket

  • Schedule a cron job to run the backup regularly

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Q3. how do you give executable permissions of a file only to the user?

Ans.

To give executable permissions of a file only to the user, use the chmod command with the u+x option.

  • Open the terminal and navigate to the directory where the file is located.

  • Use the command 'chmod u+x filename' to give executable permissions to the user only.

  • Verify the permissions using the 'ls -l' command.

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Q4. what is the difference between a NAT gateway and an internet gateway

Ans.

NAT gateway is used to provide internet access to private subnets while internet gateway is used to provide internet access to public subnets.

  • NAT gateway is used for outbound traffic while internet gateway is used for inbound and outbound traffic.

  • NAT gateway is associated with a private subnet while internet gateway is associated with a public subnet.

  • NAT gateway performs network address translation while internet gateway does not.

  • Example: NAT gateway is used to allow EC2 inst...read more

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Q5. on what basis you have implemented autoscaling in your project?

Ans.

Autoscaling was implemented based on CPU utilization and network traffic.

  • Autoscaling was implemented to ensure that the application can handle sudden spikes in traffic.

  • CPU utilization and network traffic were used as metrics to trigger autoscaling.

  • The minimum and maximum number of instances were set based on the expected traffic.

  • Load testing was done to determine the optimal scaling thresholds.

  • Autoscaling policies were set to gradually add or remove instances to avoid sudden ...read more

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Q6. how do you build and push a docker image to ECR?

Ans.

To build and push a docker image to ECR, we need to create a Dockerfile, build the image, tag it, login to ECR, push the image to ECR.

  • Create a Dockerfile with necessary configurations

  • Build the image using docker build command

  • Tag the image using docker tag command

  • Login to ECR using AWS CLI command aws ecr get-login-password

  • Push the image to ECR using docker push command

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Q7. how did you integrate Jenkins and Docker?

Ans.

Jenkins and Docker can be integrated using Jenkins Docker plugin.

  • Install Docker plugin in Jenkins

  • Configure Docker Cloud in Jenkins

  • Create a Jenkins pipeline job and specify Docker image to be used

  • Use Docker commands in Jenkinsfile to build and push Docker images

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Q8. how does autoscaling work in AWS?

Ans.

Autoscaling in AWS automatically adjusts the number of EC2 instances in a group based on demand.

  • Autoscaling groups are created and configured with minimum and maximum number of instances.

  • Scaling policies can be defined to adjust the number of instances based on metrics like CPU utilization or network traffic.

  • Autoscaling can be triggered manually or automatically based on CloudWatch alarms or scheduled events.

  • Autoscaling can also integrate with Elastic Load Balancing to distri...read more

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Q9. what is AWS config and define it

Ans.

AWS Config is a service that provides a detailed inventory of AWS resources and their configuration history.

  • AWS Config continuously monitors and records changes to resources and their configurations.

  • It provides a detailed view of resource inventory, configuration history, and configuration change notifications.

  • It helps in compliance auditing, security analysis, and resource change tracking.

  • AWS Config rules can be used to evaluate resource configurations against best practices...read more

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Q10. what is a launch template?

Ans.

A launch template is a pre-configured set of Amazon Machine Images (AMIs), instance types, and other settings used to launch EC2 instances.

  • Launch templates simplify the process of launching EC2 instances by providing a pre-configured set of settings.

  • They can be used to launch instances in an Auto Scaling group or individually.

  • Launch templates can be versioned and updated to reflect changes in the desired configuration.

  • They can also be shared across AWS accounts and regions.

  • La...read more

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Q11. Linux command to find disc utilization?

Ans.

Command to find disk utilization in Linux?

  • Use 'df' command to display disk space utilization

  • Use '-h' option to display sizes in human-readable format

  • Use '-T' option to display file system type

  • Use '-x' option to exclude certain file system types

  • Example: 'df -hT -x tmpfs -x devtmpfs'

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Q12. What is a NAT gateway?

Ans.

A NAT gateway is a managed network address translation service provided by AWS.

  • It allows instances in a private subnet to connect to the internet or other AWS services.

  • It provides better availability and bandwidth than a NAT instance.

  • It automatically scales to meet traffic demands.

  • It can be used to reduce the attack surface of instances in a private subnet.

  • It can be used to access resources in a VPC from a remote network.

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Q13. explain CI/CD in your project.

Ans.

CI/CD is the process of continuous integration and continuous delivery/deployment.

  • In our project, we use Jenkins as our CI/CD tool.

  • Every time a developer pushes code to the repository, Jenkins automatically builds and tests the code.

  • If the build and tests pass, Jenkins deploys the code to a staging environment for further testing.

  • Once the code is approved in staging, Jenkins deploys it to production.

  • This process ensures that code changes are thoroughly tested and deployed qui...read more

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