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aws - to study stephane mareek's course > Section 20: AWS Monitoring & Audit, CloudWatch, X-Ray and CloudTrail: X-Ray > Flashcards

Section 20: AWS Monitoring & Audit, CloudWatch, X-Ray and CloudTrail: X-Ray Flashcards

1
Q

What did Amazon EventBridge used to be called?

A

CloudWatch Events.

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2
Q

What is Amazon EventBridge?

A

EventBridge is a serverless service that uses events to connect application components together, making it easier for you to build scalable event-driven applications. Event-driven architecture is a style of building loosely-coupled software systems that work together by emitting and responding to events. Event-driven architecture can help you boost agility and build reliable, scalable applications.

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3
Q

About Amazon EventBridge.

A rule can run in response to an event, or at certain time intervals. For example, to periodically run an AWS Lambda function, you can create a rule to run on a schedule.What are the two types of scheduled rules? (Just names, you’ll describe them later).

A
  1. Rate expression
  2. Cron expression.
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4
Q

Regarding Amazon EventBridge and creating rules, what’s a rate expression?

A
  • Rules that run at a regular rate
  • EventBridge runs these rules at regular intervals; for example, every 20 minutes.
  • To specify the rate for a scheduled rule, you define a rate expression.
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5
Q

Regarding Amazon EventBridge and creating rules, what’s a cron expression?

A
  • Rules that run at specific times
  • EventBridge runs these rules at specific times and dates; for example, 8:00 a.m. PST on the first Monday of every month.
  • To specify the time and dates a scheduled rule runs, you define a cron expression.
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6
Q

What are examples of Amazon EventBridge events?

A
  • An event indicates a change in an environment such as an AWS environment, a SaaS partner service or application, or one of your applications or services. The following are examples of events:
  • Amazon EC2 generates an event when the state of an instance changes from pending to running.
  • Amazon EC2 Auto Scaling generates events when it launches or terminates instances.
  • AWS CloudTrail publishes events when you make API calls.
  • Trigger Lambda functions, send SQS/SNS messages.
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7
Q

What are Amazon EventBridge events used for? What’s an example.

A
  • Rules use event patterns to select events and send them to targets. An event pattern either matches an event or it doesn’t.
  • IAM root user sign in event -> sns topic with email notifications.
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8
Q

What are some popular EventBridge (possibly rules) sources (and their corresponding example events)? (hint, there are six, but i’ll cut you a break and say 4/5 of them.)

A
  • ec2 instance (ex: start instance)
  • CodeBuild (ex: failed build)
  • s3 event (ex: upload object)
  • Trusted Advisor (ex: new Finding)
  • CloudTrail (ex: any API call)
  • Schedule or Cron (ex: every 4 hours)
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9
Q

what are the exmple destinations for Amazon EventBridge Rules?

A
  • Compare: Lambda, AWS Batch, ECS Task
  • Integration: SQS, SNS, Kinesis Data Streams
  • Orchestration: AWS Step Functions, CodePipeline, CodeBuild
  • Maintenance: SSM, EC2 Actions
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10
Q

Do you have the option to use a filter to determine which events Amazon EventBridge is gonna pass onto a destination? What are some filter examples.

A

Yes. For example, you can create an event pattern that matches an event when:
* A field of the event is within a specific numeric range.
* The event comes from a specific IP address.
* A specific field doesn’t exist in the event JSON.

Amazon EventBridge supports declarative content filtering using event patterns. With content filtering, you can write complex event patterns that only match events under very specific conditions.

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11
Q

idk find some json stuff for amazon eventbridge rules. I know you’re a little struggly now.

A
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12
Q

What are Amazon EventBridge event buses?

A

An event bus is a router that receives events and delivers them to zero or more destinations, or targets. Event buses are well-suited for routing events from many sources to many targets, with optional transformation of events prior to delivery to a target.

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13
Q

When using Amazon EventBridge event buses, do you have the ability rep replay archived events?

A

Yes.

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14
Q

When using Amazon EventBridge event buses, can you archive events (all/filter) sent to an event bus (indefinitely or set period)?

A

Yes

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15
Q

When using Amazon EventBridge event buses, can event buses be accessed by aws accounts?

A

Yes. Event buses can be accessed by other AWS acounts using Resource-based policies?

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16
Q

How do event buses work?

A
  • Event buses enable you to route events from multiple sources to multiple destinations, or targets.
  • At a high level, here’s how it works:
  • An event source, which can be an AWS service, your own custom application, or a SaaS provider, sends an event to an event bus.
  • EventBridge then evaluates the event against each rule defined for that event bus.
  • For each event that matches a rule, EventBridge then sends the event to the targets specified for that rule. Optionally, as part of the rule, you can also specify how EventBridge should transform the event prior to sending it to the target(s).
  • An event might match multiple rules, and each rule can specify up to five targets. (An event may not match any rules, in which case EventBridge takes no action.)
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17
Q

Okay, so you want to use and amazon eventbridge event bus to um create a bus (figure out better words for this later) between eventbridge and other aws services. Do you use a default event bus, a partner event bus, or a custom event bus?

A

Default event bus

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18
Q

Okay, so you want to use and amazon eventbridge event bus to um create a bus (figure out better words for this later) between eventbridge and some big-name non-aws aws services, like Saas providers/things zendesk and datadog. Do you use a default event bus, a partner event bus, or a custom event bus?

A

Partner event bus

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19
Q

Okay, so you want to use and amazon eventbridge event bus to um create a bus (figure out better words for this later) between eventbridge and some apps you made (i presume they’re not hosted on aws). Do you use a default event bus, a partner event bus, or a custom event bus?

A

Custom event bus.

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20
Q

What does Amazon EventBridge Schema Registry allow you to do?

A
  • The Schema Registry allows you to generate code for your app that will know in advance how data is structured in teh event bus.
  • Search a collection of schemas that can be leveraged by developers in your organization. EventBridge allows you to add schemas manually or can automate the process by using schema discovery.
  • idk look into it later
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21
Q

Can Amazon EventBridge Schema Registry schemas be versioned?

A

Yes

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22
Q

T/F can EventBridge analyze the events in your bus and infer the schema?

A

yea. also, look into this later. idk if it’s important.

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23
Q

What do amazon eventbridge resource based policies do? example? (it’s okay if you give the use case, i’ll provide it just in case you do but i’m asking ask you about that later)

A
  • Manage permissions for a specific event bus
  • ex: allow/deny events from anoterh aws account or aws region
  • use case: aggregate all events from your aws org in a single aws account or aws region
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24
Q

What is a use case for an amazon EventBridge - Resource-based Policy? (i’ll provide the example, just in case you answer that one instead. honestly i don’t quite get the different at this point.)

A
  • use case: aggregate all events from your aws organization in a single aws account or aws region.
  • example: allow/deny events from another aws account or aws region.
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25
Q

Okay so what’s missing in this amazon eventbridge resource based policy json?

A
  • events:putEvents (the quotes are already there)
  • arn:aws:events:us-east-1:1234567875:event-bus/central-event-bus. (quotes are already there)
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26
Q

AWS EventBridge

Can you create cross account access to a single event bus?

A

yep

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27
Q

What do you need to create EventBridge cross account access to a single event bus (it’s called multi account aggregation)

A

a resource policy for the central account’s event bus.

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28
Q

how does EventBridge multi account aggregation work?

A
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29
Q

Okay now it’s x ray time. What’s it look like X-Ray is for?

A

looks like it’s some fancy new way to debug, but you don’t have to test locally and add log statements everywhere and redploy in production

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30
Q

Does xray give you visual (also called graphical but, and call me a snob, that doesn’t look like a graph to me) analysis of your applications?

A

yep

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31
Q

So what are the advantage sof using xray?

A
  • troubleshooting performance (including bottlenecks)
  • understand dependencies in a microservices architecture
  • pinpiont service issues
  • review request behavior
  • find errors and exceptions
  • find out things like whether you’re meeting time SLA, where you’re getting throttled, identify users that are impacted.
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32
Q

What aws services is xray compatible with? (or which ones is it really popular with)

A
  • aws lambda
  • elastic beanstalk
  • ecs
  • elb
  • api gateway
  • ec2 instances or any app server (even on premises)
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33
Q

Is x ray compatible with on-premise app servers?

A

Yea

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34
Q
  • Does x ray use tracing?
  • what’s tracing (the tiny explaination version)?
A
  • yea
  • it’s an end to end way of following a “request”
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35
Q

xray tracing: flush out lines associated with the following terms:
* segments
* annotations

A
  • segments: tracing is made of segments (and sub segments)
  • annotations can be added to traces to provide extra information
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36
Q

about xray: T/F

Each component dealing with the request adds it’s own trace

A

true

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37
Q

Xray T/F

  • xray gives you the ability to trace every request
  • xray gives you the ability to trace a sample of requests (as a percentage for example or a rate per minute)
A
  • T
  • T
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38
Q

what are the two aws services you’re gonna need for xray?

A
  • IAM for authorization (it totally is an aws service)
  • KMS for encryption at rest (so KMS is a thing outside of aws - key management service (ex, gcp has their own) but it turns out AWS KMS is, you know, i beleive classified as another aws service)
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39
Q

What kind of things does the aws xray sdk capture (4 examples)?

A
  • calls to aws services
  • http/https requests
  • database calls (MySQ, PostgreSQL, DynamoDB)
  • Queue calls (SQS)
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40
Q

When you want to use aws xray sdk, do you need to modify a lot of code?

A

slides say nope.

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41
Q

how does the xray daemon work?

A

the aws xray daemon works as a low level udp packet interceptor (linux/windows/mac)

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42
Q

T/F about xray

Each application must have the IAM rights to write data to xray.

A

True

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43
Q

Does aws lambda/other aws services run xray daemon for you?

A

Yea. I know that’s a little vague. In case you want to look into it later, the exact sentence is “AWS Lambda / other AWS services already run teh X-Ray daemon for you”.

44
Q

How often can an xray daemon running on a machine (say an ec2 instance) send batch (which I suspect is shorthand for send ‘a batch of information’ to aws xray?

A

every 1 second.

44
Q

Say you’re on an ec2 instance. You have an application code and xray sdk running on that instance. it sends traces to what?

A

the xray daemon also running on the same machine (double check that, or actually do it so you know for sure.)

44
Q

How do you enable xray?

A
  1. your code (Java, Python, Go, Node.js, .NET) must import the AWS xray sdk. (don’t worry about the languages, i’ll ask you about those later)
  2. install the xray daemon or enable xray aws integration
44
Q

Just talk about this.

A
45
Q

Just in case it’s a selling point, is the ideal behind xray’s visual display that even non technical people can help troubleshoot?

A

yea.

46
Q

about xray:

T/F is the service map (that visual) computed from all segments and traces?

A

T

47
Q

About troubleshooting xray (very meta). If xray is not working on an ec2 instance, what are the two things you should do?

A
  1. ensure the ec2 iam role has the proper permissions
  2. ensure the ec2 instance is running the xray daemon
48
Q

About troubleshooting xray (again, meta) (honestly, this one seems less about troubleshooting and more about enabling but whatever). To enable xray on aws lambda (or things to do if xray isn’t working with your aws lambda stuff), what 3 things should you do/check.

A
  1. ensure it has an iam execution role with proper policy (AWSX-RayWriteOnlyAccess)
  2. ensure that xray is imported in the code
  3. enable Lambda X-Ray Active Tracing.
49
Q

What’s the policy you need to apply to the IAM execution role to enable xray on aws lambda?

A

AWSX-RayWriteOnlyAccess

50
Q

What’s the aws xray (at least slide version) def of instrumentation

A

Instrumention means the measure of product’s performance in order to diagnose errors and write trace information (gotta cite the wiki cuz the slide version was actually written in a non-viable-sentancey way https://en.wikipedia.org/wiki/Instrumentation_(computer_programming) )

51
Q

To instrument yor application code you use the fill in the blank

A

xray SDK

52
Q

T/F, regarding xray

Do many sdks only require configuration changes?

A

Yea

53
Q

T/F: you can modify your app code to customize and (sorry, these last couple slides have not been vetted for grammar/syntax usage, so you might want to check these things out) I bet the word is supposed to be annotate but annotation is the word that was used, and also i’m not sure whether it’s the same definition of annotation being used (like I don’t think it’s @Query we’re talking about here). anyway, so the exact quote is “annotation the data that the SDK sends to xray using interceptors, filters, handlers, middleware”

A

T

54
Q

What kind of instrumentation can you use to get xray to work? (like the three categories - if you can provide the names and read the answer we’ll call that a 4 out of 5)

A

Auto instrumentation – instrument your application with zero code changes, typically via configuration changes, adding an auto-instrumentation agent, or other mechanisms.

Library instrumentation – make minimal application code changes to add pre-built instrumentation targeting specific libraries or frameworks, such as the AWS SDK, Apache HTTP clients, or SQL clients.

Manual instrumentation – add instrumentation code to your application at each location where you want to send trace information.

55
Q

xray sdk provides interceptors to…?

A

add to your code to ttrace incoming http requests

56
Q

xray sdk provides client handlers to…?

A

client handlers to instrument AWS SDK clients that your application uses to call other AWS services

57
Q

xray sdk provides an http client to…?

A

An HTTP client to instrument calls to other internal and external HTTP web services

58
Q

aws xray uses filter expressions to:

A

Use filter expressions to view a trace map or traces for a specific request, service, connection between two services (an edge), or requests that satisfy a condition. X-Ray provides a filter expression language for filtering requests, services, and edges based on data in request headers, response status, and indexed fields on the original segments.

59
Q

T/F: When you add the middleware to your application and configure a segment name, the X-Ray SDK for Python creates a segment for each sampled request. This segment includes timing, method, and disposition of the HTTP request. Additional instrumentation creates subsegments on this segment.

A

T.

The X-Ray SDK for Python supports the following middleware to instrument incoming HTTP requests:

Django

Flask

Bottle

60
Q

idk think about whether you want to ask a question about this code snippet (it’s an example for node.js and express (in a slide about instrumentation in your code))

A

fls;kadjf

61
Q

xray concepts (answering with the slide definition, but honestly I don’t love them and you might want to see if there are any clearer definitions):
* what are segments? (it’s like annoyingly vague)

A

things each app/service sends (i suppose to xray is the location)

62
Q

xray concepts (answering with the slide definition, but honestly I don’t love them and you might want to see if there are any clearer definitions):
* when do you use subsegments

A

for when you need more details in your segment.

idk see if there’s an example you can find?

63
Q

xray concepts (answering with the slide definition, but honestly I don’t love them and you might want to see if there are any clearer definitions):
* what’s a trace?

A

segments collected together to form an end to end trace

64
Q

xray concepts (answering with the slide definition, but honestly I don’t love them and you might want to see if there are any clearer definitions):
* why use sampling?

A

To decrease the amount of requests sent to xray and reduce costs

65
Q

xray concepts (answering with the slide definition, but honestly I don’t love them and you might want to see if there are any clearer definitions):
* what are annotations?

A

key value pais used to index traces and use with filters

66
Q

xray concepts (answering with the slide definition, but honestly I don’t love them and you might want to see if there are any clearer definitions):
* what is metadata

A

key value pairs not indexed, not used for searching

67
Q

the xray daemon / agent has a config you can use to send traces cross accounts.
* T/F: this allows you to have a central account for all your app tracing
* T/F: you need to make sure the IAM permissions are correct - the agent will assume the role.

A

True and true.

68
Q

Okay, with Xray sampling rules can you control the amount of data you record?

A

yes

69
Q

with xray sampling can you modify sampling rules without changing your code?

A

Yes.

70
Q

xray sampling

By default, the xray sdk records the blank 1 and blank 2 of any additional requests.

A
  1. first request each second
  2. five percent
71
Q

xray sampling t/f

one request per second is the reservoir, which ensures that at least one trace is recorded each second as long as the service is serving requests.

A

True

72
Q

xray sampling

What is the rate (aka fixed rate) at which additional requests beyond the reservoir size are sampled?

A

5%.

73
Q

Can you create your own xray custom sampling rules?

A

Yea

74
Q

What do you need to create your own xray custom sampling rules?

A

Reservoir and rate values.

75
Q

Fill in the question marks of an example of an xray custom sampling rule for a higher minimum sampling rate for posts .

  • rule name - POST minimum
  • Priority - 100
  • Reservoir - ?
  • Rate - ?
  • Service name - asterisk
  • Host - asterisk
  • HTTP method - POST
  • URL path - asterisk
  • Resource ARN - asterisk
A
  • Reservoir - 10
  • Rate - 0.10
76
Q

Fill in the question marks of an example of an xray custom sampling rule to create a debugging rule to trace all requests for a problematic route (a high priority rule applied temporarily for debugging).

  • rule name - DEBUG - history updates
  • Priority - 1
  • Reservoir - ?
  • Rate - ?
  • Service name - Scorekeep
  • Host - asterisk
  • HTTP method - PUT
  • URL path - /history/asterisk
  • Resource ARN - asterisk
A
  • Reservoir - 1
  • Rate - 1
77
Q

xray sampling rules - what is the priority range (min to max values) and which value has the highest priority.

A

priority range: 1 - 9999
highest priority: 1
lowest priority: 9999

78
Q

about xray sampling rules:
1. what is the def of reservoir size?
2. what is the def of fixed rate

A
  1. max number of requests to sample per second.
  2. rate of sampling to allow after exceeding the reservoir size
79
Q

what’s the IAM policy that the xray daemon needs to have so it’s authorized to make the correct API calls to function (make write api calls) correctly?

A

arn:aws:iam::aws:policy/AWSXrayWriteOnlyAccess

80
Q

What are the xray write APIs (just names) used by the xray daemon? (there are 5 main ones mentioned in the slides)

A
  • PutTraceSegments
  • PutTelemetryRecords
  • GetSamplingRules
  • GetSamplingTargets
  • GetSamplingStatisticSummaries
81
Q

What is xray write API PutTraceSegments used for?

A

to upload segment documents to aws xray

82
Q

What is xray write api PutTelemetryRecords used by/for, and what are the three sub apis mentioned in the slides?

A

Used by the aws xray daemon to upload telemetry. The three sub apis are SegmentsReceivedCount, SegmentsRejectedCounts, and BackendConnectionErrors.

83
Q

What is xray write api GetSamplingRules used for?

A

to retrieve all sampling rules (to know what/when to send)

84
Q

This is the aws managed policy AWSXrayWriteOnlyAccess. IT gets used by the xray daemon so the daemon has permission to make necessary api calls. What’s in the hidden section?

hint: apis are PutTraceSegments, PutTelemetryRecords, GetSamplingRules, GetSamplingTargets and GetSamplingStatisticSummaries.

A
85
Q

Okay, so what are the xray read apis (names only) that got mentioned in the slides?

A
  • GetServiceGraph
  • BatchGetTraces
  • GetTraceSummaries
  • GetTraceGraph
86
Q

What is the xray read api GetServiceGraph used to do?

A

Get main graph

87
Q

What is the xray read api BatchGetTraces used to do?

A

retrieve a list of traces specified by ID. Each trace is a collection of segment documents that originates from a single request.

88
Q

What is the xray read api GetTraceSummaries used to do?

A

Retrieve IDs and annotations for traces available for a spcified time frame using an optional filter. to get the full traces, pass the trace ID to BatchGetTraces.

89
Q

What is the xray read api GetTraceGraph used to do?

A

Retrive a service graph for one or more specific trace ID

90
Q

What is the arn for the aws managed policy for granting a user, group or role access to xray read apis?

A

arn:aws:iam::aws:policy/AWSXrayReadOnlyAccess

91
Q

T/F : aws elastic beanstalk platforms include the xray daemon

A

True

92
Q

You can run the xray daemon by setting an option in the elastic beanstalk console or with a configuration file in .ebextensions/xray-daemon.config. What’s in the config file?

A
93
Q

If you want to use xray to monitor an application deployed using elastic beanstalk, do you still need to worry about giving your elastic beanstalk instance profile the correct IAM permissions so that the xray daemon can function correctly?

A

Yes

94
Q

If you want to use xray to monitor an application deployed using elastic beanstalk and you’ve already given your instance profile the correct iam permissions so that the xray daemon can function correctly, what else do you need to do?

A

You need to make sure the application code is instrumented with the xray sdk.

95
Q

What two things do you need to do to make sure xray can monitor an app you have deployed on an elastic beanstalk instance?

A
  1. make sure you give your instance profile the correct iam permissions so that the xray daemon can function correctly.
  2. make sure your application code is instrumented with the xray sdk.
96
Q

Elastic Beanstalk platforms provide a configuration option that you can set to run the [xray] daemon automatically. However, there is one type of elastic beanstalk platform that aws does not provide the xray daemon for (does not give the config for setting up automatically). Which is that?

A

xray daemon is not provided (no option for having it setup automatically) for Multicontainer Docker (Amazon ECS) platform

97
Q

okie dokie lets talk about xray and ecs. There are three main ways/patterns for integrating xray with ecs. What are they? (There are three of them.) (Just names, we’ll talk details later.)

A
  • ECS Cluster - xray container as daemon
  • ecs cluster - xray container as a side car
  • fargate cluster - xray container as a side car.
98
Q

Okay, i think i’ve asked this before, but what’s a daemon

A

“In multitasking computer operating systems, a daemon is a computer program that runs as a background process, rather than being under the direct control of an interactive user. Wikipedia”

https://en.wikipedia.org/wiki/Daemon_(computing)

99
Q

What’s a sidecar?

A

Sidecars are supporting processes or services that are deployed with the primary application. On a motorcycle, the sidecar is attached to one motorcycle, and each motorcycle can have its own sidecar. In the same way, a sidecar service shares the fate of its parent application.

https://learn.microsoft.com/en-us/azure/architecture/patterns/sidecar

100
Q

what’s the visual you should think of when people talk about using the ecs cluster (with ec2 instances) - xray integration option with the xray container as a daemon?

A
101
Q

what’s the visual you should think of when people talk about using the ecs cluster (with ec2 instances) - xray integration option with the xray container as a side car?

A
102
Q

what’s the visual you should think of when people talk about using the fargate cluster - xray integration option with the xray container as a side car?

A
103
Q

About ecs + xray. This is an example task definition. What goes in the yellow?

Note that the close scope curly brace is totally there, it’s just cut off. It’s not super important, just wanted to mention in case you got fixated on that.

A

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