Chpater 15 Monitoring

Question 1

Other than visualizing logs and metrics and discovering insights that enable you to optimize your resources, what else does CloudWatch provide?

Answer 1

• Setting of alarms
• Automation of recovery from errors
• Troubleshooting

Question 2

A _______ is a collection of metrics or a container of related metrics

Answer 2

namespace

Question 3

dimension

Answer 3

A dimension is a name/value pair used to define a metric uniquely. For example, for the namespace AWS/EC2 and name/metric CPUUtilization, the dimension might be InstanceId.

Question 4

high resolution metrics

Answer 4

In cloudwatch, data points that have a granularity of less than one second

Question 5

The default configuration is to store log data in Amazon CloudWatch Logs ________

Answer 5

indefinitely

Question 6

how is cloudwatch logs charged?

Answer 6

Charged for any data stored in service as well as any data transferred out

Question 7

What are different alarm states in CloudWatch Alarms?

Answer 7

1. OK
2. ALARM
3. INSUFFICIENT_DATA

Question 8

What are the alarm setting which need to be configured for CloudWatch Alarms?

Answer 8

1. PERIOD (interval for data points)
2. EVALUATION PERIOD (# of data points to evaluate)
3. DATA POINTS TO ALARM
   (# data points within evaluation period above threshold necessary go into ALARM state)

Question 9

In the context of EC2 instances, an alarm can trigger…

Answer 9

auto scaling actions

Question 10

What are some ways CloudWatch Alarms can integrate with other AWS resources?

Answer 10

via SNS or SQS

Question 11

What are examples of services that produce global events which are consumed/processed by CloudTrail?

Answer 11

1. IAM
2. STS
3. CloudFront
   4, Route 53

Question 12

Global events in CloudTrail are recognized as occurring where?

Answer 12

Us East - 1 (Northern Virginia)

Question 13

A trail allows delivery of CloudTrail events to what destinations?

Answer 13

1. S3 Bucket
2. CloudWatch Logs
3. CloudWatch events

Question 14

X-ray trace vs segment vs sub-segment

Answer 14

Trace is E2E path of a request through your application. Segment is like the link the in chain (the AWS service), and the subsegment is the underlying API call made from a particular service

Question 15

By default EC2 instances do not report OS level metrics. But you can enable this by doing what?

Answer 15

Installing CloudWatch agent onto the instance.

Question 16

Default tracking behavior of CloudWatch?

Answer 16

Management events (create/modify/delete) calls within the last 90 days.

Question 17

Difference b/t management and data events

Answer 17

Management events are events performed on an AWS resource. Data events are events performed on data in your AWS account.

Question 18

What is main purpose of X-ray?

Answer 18

Detect bottlenecks and and monitor health of various components within a distributed application.

Question 19

When using X-ray, a ______ is added to the header of requests.

Answer 19

trace ID

Question 20

Purple color in X-Ray service graph means what?

Answer 20

There is a throttling issue

Question 21

Can alarms trigger lambda functions?

Answer 21

Not directly, but you can use an alarm to trigger an SNS topic which triggers a Lambda function.

Question 22

What is notable system metric not available to CloudWatch default metrics?

Answer 22

RAM

Question 23

What is Cloud Watch namespace for EC2?

Answer 23

AWS/EC2