AWS Interview Questions and Answer Part – 20

Which of the following options describes Infrastructure in Code?

• Script containing all needed steps to transform current state into target state.
• Checklist containing all steps needed to transform current state into target state manually.
• Blueprint containing target state. Tool transforming current sate into target state. (Ans)

CloudFormation allows you to __ a stack.

• create, update, and delete (Ans)
• create and update
• create

A minimal CloudFormation template contains:

• Format Version, Description, Resources (Ans)
• Resources, Inputs, Outputs
• Resources

A resource definition consists of:

• Identifier, Type, Properties (Ans)
• Ordinal Number, Identifier, Properties
• Type, Properties

The following resources describe…

“Resources”: {
“EC2Instance”: {
“Type”: “AWS::EC2::Instance”,
“Properties”: {
“ImageId”: “ami-bff32ccc”,
“InstanceType”: “t2.nano”
}
}
}

• a S3 Bucket.
• an EC2 Instance. (Ans)
• a RDS Database Instance.
• an AMI.

Which value is valid for the following parameter?

“Parameters”: {
“VPC”: {
“Description”: “The default VPC”,
“Type”: “AWS::EC2::VPC::Id”
}
}

• vpc-ssh-bastion-host (Ans)
• vpc-6b53320e
• subnet-e16fa6ca

Which of the following options adds the private IP address of the EC2 instance to the outputs?

{
“Resources”: {
“EC2Instance”: {
“Type”: “AWS::EC2::Instance”
},
},
“Outputs”: {
“PrivateIp”: {
“Value”: {“Fn::GetAtt”: [“EC2Instance”, “PrivateIp”]}
}
}
}

• {“Ref”: “EC2Instance”}
• {“Ref”: [“EC2Instance”, “PrivateIp”]}
• {“Fn::GetAtt”: [“EC2Instance”, “PrivateIp”]} (Ans)

A CloudFormation template includes the following mappings section.

“Mappings”: {
“RegionAMI”: {
“us-east-1”: {“AmazonLinux”: “ami-8fcee4e5”, “Ubuntu”: “ami-fce3c696”},
“eu-west-1”: {“AmazonLinux”: “ami-e1398992”, “Ubuntu”: “ami-f95ef58a”},
“ap-northeast-1”: {“AmazonLinux”: “ami-59bdb937”, “Ubuntu”: “ami-a21529cc”}
}
}

What’s the output of the following function?

{“Fn::FindInMap”: [“RegionAMI”, “eu-west-1”, “AmazonLinux”]}

• ami-e1398992 (Ans)
• ami-f95ef58a
• Nothing, the parameters are invalid.
• ami-59bdb937

A stack named webapp was created in region eu-west-1. What’s the output of the following function?

{“Fn::Select”: [“0”, {“Fn::GetAZs”: {“Ref”: “AWS::Region”}}

• az-1
• eu-west-1a (Ans)
• eu-west-1

CloudFormation parameters allow you to:

• Add additional properties to resources without changing the template
• Create multiple stacks based on the same template
• Specify input for a template when creating or updating a stack (Ans)

What’s wrong with the described EC2 instance?

“EC2Instance”: {
“Type”: “AWS::EC2::Instance”,
“Properties”: {
…
“UserData”: {“Fn::Join”: [“\n”, [
“#!/bin/bash -ex”,
“yum install -y httpd”,
“cd /var/www/html”,
“echo ‘Hello World!’ > index.html”,
“service httpd start”
]]}
}
}

• User Data is limited to 128 characters.
• There is no package called httpd.
• User Data needs to be encoded in Base64. (Ans)

A CloudFormation template is written in…

• Bash Script
• XML
• JavaScript
• JSON (Ans)

Which of the following is true of ECS?

• ECS automatically launches a fully-managed EC2 instance for every cluster created.
• At the cluster level, ECS can only be managed from the browser-based console.
• Besides for the regular AWS resources in use, ECS charges users on a per-cluster basis.
• ECS offers integration with either the ECS registry or Docker Hub images. (Ans)

You can display detailed information about an ECS cluster from the command line using…

• aws ecs clusters –list
• aws ecs list-clusters
• aws ecs describe-clusters (Ans)
• aws ecs cluster –help

You can set load balancing and auto scaling for a deployment in the __ configuration menu of the console.

• Container (Ans)
• Services
• Cluster Update
• Task Definitions

Which of the following commands will return authentication credentials for the EC2 Container Repository service?

• aws ecr login –region
• aws get-login –region
• aws ecr get-login –region (Ans)
• aws get-region

Adding the “Amazon EC2 Container Service for EC2 Role” to your EC2 instance allows _.

• the EC2 instance to be registered within an ECS system
• the account root user to manage the EC2 instance
• ECS resources to connect to the EC2 instance
• the EC2 instance to connect to ECS resources (Ans)

Which of the following files on an EC2 ECS-optimized AMI instance must be edited to permit access to Docker Hub private repositories?

• /ecs/ecs.config
• /etc/ecs/ecs-config
• /etc/ecs-config
• /etc/ecs/ecs.config (Ans)

What is the primary purpose of adding a tag to a Docker image?

• To allow for easier visual identification once your infrastructure grows
• To direct Docker to the appropriate remote repository (Ans)
• To identify the object as an image
• To identify the image’s ownership and origin

For security, the Docker website uses encryption certificates to _.

• ensure that all images uploaded to Docker Hub are free of malware
• secure the computers of local Docker clients
• ensure that all “docker run” operations are valid
• secure connections between the website and clients (Ans)

What is the role of apache2ctl in this command?
docker run -d -p 80:80 webserver /usr/sbin/apache2ctl -D FOREGROUND

• apache2ctl will check to make sure the Apache webserve software package is properly installed on a container.
• apache2ctl is the name of a Docker image.
• apache2tcl will run the Apache webserver software package when the container boots. (Ans)
• apache2ctl will launch a new Docker container as a backend server to your main container.

Rajesh Kumar

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