A single instance application on an EC2 in AWS to Convert the application to operate on multiple servers


You run a single instance application on an EC2 instance in AWS. your architecture reams are looking to make changes and convert the application to operate on multiple servers. The app runs on Linux and currently access millions of flat file data file in the /data/… folder structure.

This database is stored on an EBS volume attached to the EC2 instance. How can this be moved to work on multiple servers with as little application changes as possible? What product would you suggest?

 

Answer: EFS

For this use-case, you should start looking at the new Amazon Elastic File System (EFS), which is designed to be multiply attached in exactly the way you are wanting. The key difference between EFS and EBS is that they provide different abstractions: EFS exposes the NFSv4 protocol, whereas EBS provides raw block IO access.

 

When should you use Lambda over EC2?


– Changes to Amazon S3 Buckets
– Updates to an Amazon DynamoDb tables
– Custom events generated bu your application or devices
– Kinesis Streams

Create a Custom AMI in AWS


Launch a Configuration Instance

Launch an instance from a Base AWS Linux AMI:

  • Login to the Management Console
  • Launch EC2 instance using AWS Linux AMI:
    • t2.micro
    • Public IP
    • Create a Security Group with SSH an HTTP access
    • Download a Key Pair

Install Apache and PHP

SSH to the instance and execute the following commands to install Apache and PHP:

  • sudo yum update -y
  • sudo yum install -y httpd24 php70
  • sudo service httpd start
  • sudo chkconfig httpd on

Create a PHP page with the following commands:

  • sudo usermod -a -G apache ec2-user
  • sudo chown -R ec2-user:apache /var/www
  • echo "<?php phpinfo(); ?>" > /var/www/html/phpinfo.php

Create a Custom AMI

In the EC2 Management Console, create an image from the config instance:

  • Select the instance in the console
  • Under the Actions menu, choose Create Image:
    • Name the Image

      Create-a-Custom-AMI-in-AWS-

      how-to-Create-a-Custom-AMI-in-AWS-

      Custom-AMI-is-available

 

  • Launch an instance from the new Image

    Custom-AMI-Available-under-instance

Want to pass AWS Certified Solutions Architect – Associate Level?  Check out https://linuxacademy.com training

AWS Certified Solutions Architect IAM Questions and Answers – Sample


1.What best describes an IAM role?

A. A role is used when configuring multi-factor authentication.
B. A role is a policy that determines an IAM user’s access to AWS resources.
C. A role is something that a user, application or service can “assume” to receive temporary security credentials that provide access to a resource.
D. A role is a policy that is applied directly to an AWS resource, such as an EC2 instance.

Correct Answer : C

2.You work for a large consulting firm that has just hired a junior consultant, named Jessica, who will be working on a large AWS project. She will be working remotely and, therefore, is not present in the office. You create a new IAM user for her named “Jessica” in your company’s AWS account. On Jessica’s first day, you ask her to make a change to a CloudWatch alarm in an Auto Scaling group. Jessica reports back that she does not have access to CloudWatch or Auto Scaling in the AWS console. What is a possible explanation for this?

A. Only IAM account admins can make changes to Auto Scaling groups.
B. Because she is working remotely, she would need to SSH into the instances in the Auto Scaling group via her terminal to make the changes
C. You have not added the appropriate IAM permissions and access policies to her IAM user.
D. When you created the new user, you forgot to assign access keys.

Correct Answer : C

3.Which of the following are managed using IAM? (Choose 2)

A. Multi-Factor Authentication
B. Bucket Policies
C. Billing Reports
D. Roles

Correct Answer: A, D

4.When requested through an STS API call, credentials are returned with what components?

A. Signed URL, Security Token, Username
B. Security Token, Access Key ID, Secret Access Key, Expiration
C. Security Token, Secret Access Key, Personal Pin Code
D. Security Token, Access Key ID, Signed URL

Correct Answer: B
5.API Access Keys are required in which scenarios below? (Choose 2)

A. Retrieving data from an ElastiCache cluster.
B. On premise servers connecting to RDS databases
C. AWS CLI
D. Windows PowerShell
E. Managing AWS resources through the AWS console

Correct Answer: C and D
6.You would like to use STS to allow end users to authenticate from third-party providers such as Facebook, Google, and Amazon. What is this type of authentication called?

A. Web Identity Federation
B. Cross-Account Access
C. Enterprise Identity Federation
D. Commercial Federation

Correct Answer: A
7.Which of the following is NOT required as part of AWS’s suggested “best practices” for new accounts?

A. Delete the root account
B. Create individual IAM users
C. Use user groups to assign permissions
D. Apply an IAM password policy

Correct Answer: A
8.You have hired an engineer, Kathy Johnson, and have created an IAM user for her in the company’s AWS account. She will be overseeing the company’s DynamoDB database, so you attached the “AmazonDynamoDBFullAccess” IAM Policy to her IAM user. Six months later, Kathy was promoted to a manager and you added her to the “Managers” IAM group. The “Managers” group does not have the “AmazonDynamoDBFullAccess” policy attached to it. What will happen to Kathy’s DynamoDB access?
A. It is not possible for an IAM group to have IAM permission policies, they need to be placed at the user level
B. Nothing, as an IAM user can have multiple IAM permission policies attached to them at the same time, either directly to the user or through an associated IAM group. The multiple policies are combined and evaluated together.
C. Only one IAM policy can be attached to a user at a time. You need to create another IAM user for her to use for her to perform her DynamoDB activities.
D. You would need to remove the DynamoDB policy from her IAM user and add it to the manager’s group policy

Correct Answer: C

 

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Simple Storage Service or S3 Questions and answers


1) What is the S3 feature that allows you to store and access older iterations of objects?
– Versioning

Explanation
If versioning is enabled, S3 will keep track of and store older versions of a file each time a newer version is uploaded.
2) By setting proper permissions on the object level, you can allow the public to download the object via a URL.

Correct answer
True
3) If you have an object that is easily reproducible and must be quickly accessible, what would be the best storage class to use for it?

Correct answer
One Zone-Infrequent Access

Explanation
You should only use Amazon S3 One Zone-Infrequent Access for objects that are easily reproducible due to objects being stored in one AZ. As a trade-off, it is a cheaper storage class than standard.

4) S3 is a bulk storage service where you can store any type of file.

Correct answer
True
5) An S3 bucket name can have any name and format you like.

Correct answer
False

Explanation
S3 names must be unique across all AWS accounts worldwide, and must follow specific naming rules.
6) S3 stands for Simple Storage Solutions.
True or False: FALSE
Explanation:
S3 stands for Simple Storage Service
8) What feature MUST be used to change an object’s storage class to Glacier?

Correct answer
Lifecycles

Explanation
The only way to set an objects storage class to Glacier is through object lifecycles.