Section 1: Deployment

Question 1

AWS EC2 instance type for pay as you go?

Answer 1

On-demand

Question 2

AWS EC2 instance type for reserving for a long period of time for a lower cost?

Answer 2

Reserved

Question 3

AWS EC2 instance type for ensuring no shared physical resources?

Answer 3

Dedicated

Question 4

What is the difference between immutable & blue/green deployment?

Answer 4

Both have deploy a separate group of instances & can be switched back.

Blue/green is good when the application code changes are dependent on the resource configuration changes otherwise do immutable.

Blue/green does the environment switch over at the DNS layer whereas immutable does the switch over at the load balancer.

Question 5

What is the maximum size of an S3 object?

Answer 5

5 TB

Question 6

What is the maximum upload size of an S3 object?

Answer 6

5 GB, if you need more use multipart upload

Question 7

What are the best practices for detaching a EBS volume from a running EC2 instance?

Answer 7

First unmount the volume and then dettach the volume from the instance.

Question 8

What are the limitations of an SQS queue name?

Answer 8

Limited to 80 chars (-/_ are allowed)

Question 9

What are the best practices for stress testing with an autoscaling group and an ELB?

Answer 9

Have the testing software re-resolve the DNS for each new request (to ensure the clients are hitting all IP addresses of the scaled resources.

If sticky sessions are enabled - it is critical the load test framework does not reuse connections/clients in the tests and uses unique clients for each request.

Question 10

What are Elastic Beanstalk environments?

Answer 10

A collection of AWS resources running an application.

It can be used for production/dev/testing envs or for having different components scaling differently.

Question 11

How to test a new version on Lambda?

Answer 11

Use an alias - split the traffic between the new version and the old version.

Question 12

What goes into the .ebextensions folder?

Answer 12

YAML or JSON formatted documents for resources associated with EB (ending in .config).

These will be launched/terminated along with the elastic beanstalk environment.

Question 13

Can auto scaling groups span multiple regions?

Answer 13

No

Question 14

Can auto-scaling groups span multiple AZs within a region?

Answer 14

Yes

Question 15

When is user data run on EC2 instances?

Answer 15

Only on boot and at the root level.

Question 16

How to map DNS queries from one domain to another?

Answer 16

CNAME

Question 17

How to redirect queries to selected AWS resources?

Answer 17

Alias records

Question 18

Can ASG span regions?

Answer 18

No, ASG can only span AZ zones.

Question 19

What does an ASG do to an unhealthy instance?

Answer 19

Terminates the instance - later another scaling activity launches a new instance to replace the terminated one.

Question 20

How does DynamoDB on-demand backup work?

Answer 20

It backs up the data but it is not viewable on S3.

Question 21

In cloudformation how does one get access to the value of an attribute from a resource in a template?

Answer 21

!GetAtt

Question 22

How to configure monitoring for auto scaling instances?

Answer 22

Using a launch template - by default basic monitoring is enabled.

Question 23

What is the limit of all environment variables in a lambda function?

Answer 23

4 kb - no restriction on number of env. variables

Question 24

To export an elastic beanstalk configuration how is this done?

Answer 24

Create a saved configuration,
download it
change some attributes associated with it
Upload the saved configuration to an S3 bucket

Question 25

What are CodeDeploy Deployment groups?

Answer 25

Specified deployment groups for a CodeDeploy application

Question 26

What are EB Worker Environments?

Answer 26

App that performs operations that take a long time to complete and you want to keep it separate from your web layer use Worker Environments.

You need to include the cron.yaml file to define cron jobs.