AWS X-Ray

Question 1

X-Ray Advantages

Answer 1

• Troubleshooting performance
• understand dependencies in microservice
• pinpoint service issues
• review request behavior
• find error and exceptions
• meeting SLA times
• where I am throttled
• identify users that are impacted

Question 2

X-Ray Enablement

Answer 2

• Install the X-Ray Daemon Or enable AWS Integration
• each application must have IAM right to right data to X-ray
• AWS Lambda and other services run X-Ray
• X-Ray daemon works a low level UDP packet interceptor

Question 3

X-Ray Instrumentation

Answer 3

• Instrumentation: means the measure of production performance, diagnose errors, and to write trace information
• to instrument your application code, use the X-Ray SDK

Question 4

X-Ray: Segments

Answer 4

Each application / service will send them

Question 5

X-Ray: Subsegments

Answer 5

If you need more details in your segment

Question 6

X-Ray: Trace

Answer 6

Segments collected together from an end-to-end trace

Question 7

X-Ray: Sampling

Answer 7

Decrease the amount of requests sent to X-Ray, reduce cost

Question 8

X-Ray: Annotations

Answer 8

Key Value pairs used to index traces and use with search filters

Question 9

X-Ray: Metadata

Answer 9

Key Value pairs NOT indexed, NOT used for searching

Question 10

X-Ray: Sampling Rules

Answer 10

• you control the amount of data you record
• you can modify sampling rules without changing your code
• be default the x-ray SDK records the first request each second and 5% of any additional requests
• one request per second is the reservoir which ensure that at least one trace is recorded each second as long as the is service requests

Question 11

X-Ray: GetServiceGraph

Answer 11

Main graph

Question 12

X-Ray: BatchGetTraces

Answer 12

Retrieves a list of traces specified by ID

Question 13

X-Ray: GetTraceSummaries

Answer 13

Retrieves IDs and annotations for traces available for a specific time

Question 14

X-Ray: GetTraceGraph

Answer 14

Retrieves a service graph for one or more specific trace

Question 15

X-Ray: Elastic Beanstalk

Answer 15

• Beanstalk includes the X-Ray daemon
• set option in console or with configuration file (in .ebextenstions/X-ray-daemon.config)
• application code is instrumented with x-ray SDK
  NOTE: X-ray Daemon not provided for Multcontainer Docker

Question 16

X-Ray: ECS Integration Options

Answer 16

• Container as a Daemon: runs on the EC2 cluster where applications are running
• Container as a Side Car: runs right next to the application

Question 17

X-Ray: Task Definition

Answer 17

• Containers must be linked at the network layer by the ports.
• Container w/ Daemon works on port 2000
• Container w/ App has an Environment variable AWS_XRAY_DAEMON_ADDRESS with the value: X-ray-daemon:2000

Question 18

Which of the following does NOT help you with debugging?

• X-Ray Daemon
• X-Ray Sampling
• EC2 Instance Role
• CloudTrail

Answer 18

• X-Ray Sampling

It’s a sampling algorithm to determine which requests get traced.