Rapyder Cloud Solutions AWS Devops Engineer Interview Questions, Process, and Tips

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.

• ...read more

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.

• Autoscalin...read more

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...read more

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 netwo

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 gatew...read more

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

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

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'

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

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 ensure...read more

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 ...read more

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.

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