Compute: Amazon EC2 and AWS Lambda

Question 1

Administrator needs to check if any EC2 instances will be affected by scheduled hardware maintenance

Answer 1

Check the AWS Personal Health Dashboard

Question 2

Scheduled hardware maintenance will affect a critical EC2 instance

Answer 2

Stop and start the instance to move it to different underlying hardware

Question 3

When launching an EC2 instance the InsufficientInstanceCapacity error is experienced

Answer 3

This means AWS does not currently have enough capacity to service the request for that instance type. Try a different AZ or instance type

Question 4

The error InstanceLimitExceeded is experienced when launching EC2 instances

Answer 4

EC2 instance limits have been reached, need to contact support to request an increased limit

Question 5

System status checks are failing for an EC2 instance

Answer 5

Stop and start again to move to a new host

Question 6

For security and compliance reasons EC2 instances must not be able to access the internet

Answer 6

Launch them in a private subnet without a NAT gateway or NAT instance

Question 7

EC2 instances must communicate with an internetbased service which whitelists a single source IP address

Answer 7

Place the instances behind a NAT gateway as the device will have a single elastic IP address that can be whitelisted

Question 8

A distributed app is running on EC2 and can handle processing interruptions. Determine the best pricing model to use

Answer 8

Use Spot instances as the application can handle it if the instances are terminated

Question 9

Define AWS’ responsibilities for EC2 hardware

according to the AWS Shared Responsibility Model

Answer 9

AWS are responsible for managing the health of the underlying hosts

Question 10

A nightly job runs on EC2 and stores results in S3. Takes 2 hours using multiple on-demand instances. If it fails, it must start again. Determine the best pricing model to use

Answer 10

Request a Spot block for time period required

Question 11

An asynchronous process runs on EC2 and feeds data to a data warehouse for weekly/monthly reporting. Determine the best pricing model to use

Answer 11

Use Spot instances as the asynchronous nature of the reporting means the app can handle interruption if AWS need the capacity back

Question 12

Need to track EC2 and on-premise computer memory utilization

Answer 12

Install the unified CloudWatch agent on both EC2 and on-premises servers

Question 13

Amazon EC2 Auto Scaling automatically terminates unhealthy instances but Administrator needs to keep the logs for subsequent analysis

Answer 13

Install the CloudWatch agent to stream logs to CloudWatch Logs

Question 14

There is a suspected memory leak on an Amazon EC2 instance

Answer 14

Install the CloudWatch agent to monitor memory utilization

Question 15

An AWS Lambda function is expected to see a large increase in traffic and must scale

Answer 15

Ensure the concurrency limit is higher than the

expected simultaneous executions

Question 16

Need to invoke an AWS Lambda function every 15 minutes

Answer 16

Create an event rule in Amazon CloudWatch events to execute the function periodically