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Amazon AWS Certified DevOps Engineer - Professional Sample Questions (Q116-Q121):

NEW QUESTION # 116
You are using a configuration management system to manage your Amazon EC2 instances. On your Amazon EC2 Instances, you want to store credentials for connecting to an Amazon RDS MYSQL DB instance. How should you securely store these credentials?

• A. Give the Amazon EC2 instances an 1AM role that allows read access to a private Amazon S3 bucket.
  Store a file with database credentials in the Amazon S3 bucket. Have your configuration management system pull the file from the bucket when it is needed.
• B. Assign an 1AM role to your Amazon EC2 instance, and use this 1AM role to access the Amazon RDS DB from your Amazon EC2 instances.
• C. Store the Amazon RDS DB credentials in Amazon EC2 user data. Import the credentials into the Instance on boot.
• D. Launch an Amazon EC2 instance and use the configuration management system to bootstrap the instance with the Amazon RDS DB credentials. Create an AMI from this instance.

Answer: B

Explanation:
Explanation
Creating and Using an 1AM Policy for 1AM Database Access
To allow an 1AM user or role to connect to your DB instance or DB cluster, you must create an 1AM policy.
After that you attach the policy to an 1AM user or role.
Note
To learn more about 1AM policies, see Authentication and Access Control for Amazon RDS.
The following example policy allows an 1AM user to connect to a DB instance using 1AM database authentication.

Important
Don't confuse the rds-db: prefix with other Amazon RDS action prefixes that begin with rds:. You use the rds-db: prefix and the rds-db:connect action only for 1AM database authentication. They aren't valid in any other context.
1AM Database Authentication for MySQL and Amazon Aurora
With Amazon RDS for MySQL or Aurora with MySQL compatibility, you can authenticate to your DB instance or DB cluster using AWS Identity and Access Management (IAMJ database authentication. With this authentication method, you don't need to use a password when you connect to a DB instance. Instead, you use an authentication token.
An authentication token is a unique string of characters that Amazon RDS generates on request.
Authentication tokens are generated using AWS Signature Version 4. Each token has a lifetime of 15 minutes.
You don't need to store user credentials in the database, because authentication is managed externally using
1AM. You can also still use standard database authentication.
IAM database authentication provides the following benefits:
* Network traffic to and from the database is encrypted using Secure Sockets Layer (SSL).
* You can use IAM to centrally manage access to your database resources, instead of managing access individually on each DB instance or DB cluster.
* For applications running on Amazon EC2, you can use EC2 instance profile credentials to access the database instead of a password, for greater security.
For more information please refer to the below document link from AWS
* https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html
* https://docs

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