1. What is the AWS CLI, and how does it facilitate interactions with AWS services?
The AWS CLI is a command-line tool provided by AWS for interacting with various AWS services. It allows users to manage resources, configure services, and automate tasks through a command-line interface, making it an essential tool for DevOps engineers. Direct access to the public APIs of AWS services
2. How do you configure the AWS CLI on your local machine, and what are the key configuration settings you need to provide?
You can configure the AWS CLI using the aws configure command. Key settings include:
— AWS Access Key ID
— AWS Secret Access Key
— Default AWS region
— Output format (e.g., JSON, text)
3. How do you install the AWS CLI?
You can install the AWS CLI on various operating systems using package managers or by downloading the installer from the AWS website.
4. What is the purpose of AWS CLI profiles?
AWS CLI profiles allow you to manage multiple sets of AWS security credentials, making it easier to switch between different accounts and roles.
5. How can you configure the AWS CLI with your credentials?
You can configure the AWS CLI by running the aws configure command, where you provide your access key, secret key, default region, and output format.
6. What is the difference between IAM user-based credentials and IAM role-based credentials in the AWS CLI?
IAM user-based credentials are long-term access keys associated with an IAM user, while IAM role-based credentials are temporary credentials obtained by assuming a role using the sts assume-role command.
7. How can you interact with AWS services using the AWS CLI?
You can interact with AWS services by using AWS CLI commands specific to each service. For example, you can use aws ec2 describe-instances to list EC2 instances.
8. What is the syntax for AWS CLI commands?
The basic syntax for AWS CLI commands is aws <service-name> <operation> [options], where you replace <service-name> with the service you want to interact with and <operation> with the desired action.
9. How can you list available AWS CLI services and commands?
You can run aws help to see a list of AWS services and the corresponding commands available in the AWS CLI.
10. What is the purpose of output formatting options in AWS CLI commands?
Output formatting options allow you to specify how the results of AWS CLI commands are presented. Common options include JSON, text, table, and YAML formats.
11. How can you filter and format AWS CLI command output?
You can use filters like --query to extract specific data from AWS CLI command output, and you can use --output to choose the format of the output.
12. How can you create and manage AWS resources using the AWS CLI?
You can create and manage AWS resources using commands such as aws ec2 create-instance for EC2 instances or aws s3 cp to copy files to Amazon S3 buckets.
13. How does AWS CLI handle the pagination of results?
Some AWS CLI commands return paginated results. You can use the --max-items and --page-size options to control the number of items displayed per page.
14. What is the AWS SSO (Single Sign-On) feature in the AWS CLI?
The AWS SSO feature in the AWS CLI allows you to authenticate and obtain temporary credentials using an AWS SSO profile, simplifying the management of credentials.
15. Can you use the AWS CLI to work with AWS CloudFormation?
Yes, you can use the AWS CLI to create, update, and delete CloudFormation stacks using the aws cloudformation commands.
16. How can you debug AWS CLI commands?
You can use the --debug option with AWS CLI commands to get detailed debug information, which can help troubleshoot issues.
17. Can you use the AWS CLI in AWS Lambda functions?
Yes, AWS Lambda functions can use the AWS CLI by packaging it with the function code and executing CLI commands from within the function.
18. How can you secure the AWS CLI on your local machine?
You can secure the AWS CLI on your local machine by using IAM roles, IAM user-based credentials, and the AWS CLI's built-in encryption mechanisms for configuration files.
19. How can you update the AWS CLI to the latest version?
You can update the AWS CLI to the latest version using package managers like pip (Python package manager) or by downloading the installer from the AWS website.
20. How do you uninstall the AWS CLI?
To uninstall the AWS CLI, you can use the package manager or the uninstaller provided by the installer you used to install it initially.
21. Explain how you can use the AWS CLI to create and manage EC2 instances. Provide an example command to launch an EC2 instance.
You can create and manage EC2 instances using the aws ec2 commands. An example command to launch an EC2 instance:
aws ec2 run-instances — image-id ami-12345678 — instance-type t2.micro — key-name MyKeyPair
22. What is the purpose of AWS CLI query and JMESPath, and how can you use them to filter and format AWS CLI output?
AWS CLI query and JMESPath are used to filter and format AWS CLI output. They allow you to extract specific data from the JSON output of AWS CLI commands. For example, you can use JMESPath expressions with the — query parameter to extract specific values from the output.
23. Explain how to use AWS CLI session management, and why it can be valuable for long-running operations or multi-step tasks.
AWS CLI session management allows you to use the — profile and — duration-seconds parameters to create temporary sessions with limited permissions for specific tasks. It is valuable for enhancing security and reducing exposure to long-running operations or multi-step tasks.
24. How do you troubleshoot AWS CLI issues, such as authentication problems or permission errors?
When troubleshooting AWS CLI issues, you can:
— Verify your AWS CLI credentials.
— Check the permissions associated with your IAM user or role.
— Review AWS CloudTrail logs for detailed information about API calls.
— Examine the AWS CLI error messages for specific error codes.
