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ECS > [07] Monitoring > Flashcards

[07] Monitoring Flashcards

1
Q

What CloudWatch metrics does ECS generate for clusters?

A

CPUReservation, CPUUtilization, MemoryReservation, MemoryUtilization, GPUReservation

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2
Q

What is the CPUReservation metric for clusters?

A

The percentage of CPU units that are reserved by running EC2 tasks in the cluster

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3
Q

What is the CPUUtilization metric for clusters?

A

The percentage of CPU units currently used, divided by the total amount reserved for a cluster / service (only includes EC2 tasks)

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4
Q

What is the MemoryReservation metric for clusters?

A

The percentage of memory that is reserved by running EC2 tasks in the cluster

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5
Q

What is the MemoryUtilization metric for clusters?

A

The total memory used by tasks in a service / cluster relative to the amount reserved (only includes EC2 tasks)

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6
Q

What is the GPUReservation metric for clusters?

A

The percentage of total available GPUs that are reserved by running tasks in the cluster

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7
Q

What CloudWatch metrics does ECS generate for services?

A

CPUUtilization, MemoryUtilization

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8
Q

What is the CPUUtilization metric for services?

A

The number of CPU units in use divided by the total amount reserved for a cluster / service

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9
Q

What is the MemoryUtilization metric for services?

A

The total memory used by tasks in a service / cluster relative to the amount reserved

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10
Q

What metrics are generated when Service Connect is enabled?

A

Metrics similar to an Application Load Balancer (ALB)

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11
Q

How frequently are CloudWatch metrics published by ECS?

A

With a 1-minute frequency (ECS internally collects multiple samples and aggregates them)

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12
Q

How can you collect metrics via Prometheus?

A

By adding an AWS Distro for OpenTelemetry (ADOT) sidecar

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13
Q

What is a way to add an ADOT sidecar to a task definition?

A

The console has an option to automatically add this sidecar to the task definition

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14
Q

What state is a container instance in when the ECS agent health check passes?

A

OK

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15
Q

What state is a container instance in when the ECS agent health check fails?

A

IMPAIRED

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16
Q

How frequently does the ECS agent perform health checks on the underlying EC2 instance?

A

Every two minutes

17
Q

What is the IMPAIRED state?

A

When the ECS agent health check fails

18
Q

What is the OK state?

A

When the ECS agent health check passes

19
Q

What can tasks use to access metadata about themselves?

A

The container metadata file and the task metadata endpoint

20
Q

What does the container metadata file provide information about?

A

That task

21
Q

How is the container metadata file enabled for EC2 tasks?

A

By the ECS agent

22
Q

How is the container metadata file mounted?

A

As a Docker volume

23
Q

What does the task metadata endpoint return information about?

A

The current container or its task

24
Q

What allows services on the EC2 instance to access information about the container instance and its agent?

A

Container introspection

25
Q

What types of events does ECS emit?

A

Container instance state changes, task state changes, and service action events

26
Q

What are some examples of container instance state changes that trigger ECS events?

A

Tasks being stopped or started on the instance, or the agent disconnecting

27
Q

What are some examples of INFO events related to service actions?

A

SERVICE_STEADY_STATE, TASKSET_STEADY_STATE, CAPACITY_PROVIDER_STEADY_STATE, SERVICE_DESIRED_COUNT_UPDATED

28
Q

What are some examples of WARN events related to service actions?

A

SERVICE_TASK_START_IMPAIRED, SERVICE_DISCOVERY_INSTANCE_UNHEALTHY

29
Q

What are some examples of ERROR events related to service actions?

A

SERVICE_DAEMON_PLACEMENT_CONSTRAINT_VIOLATED, ECS_OPERATION_THROTTLED, SERVICE_DISCOVERY_OPERATION_THROTTLED, SERVICE_TASK_PLACEMENT_FAILURE, SERVICE_TASK_CONFIGURATION_FAILURE

30
Q

What service deployment state changes trigger ECS events?

A

SERVICE_DEPLOYMENT_IN_PROGRESS, SERVICE_DEPLOYMENT_COMPLETED, SERVICE_DEPLOYMENT_FAILED

31
Q

What state will a service deployment be in while ECS is performing additional steps?

A

SERVICE_DEPLOYMENT_IN_PROGRESS

32
Q

What state indicates a successful completion of a service deployment?

A

SERVICE_DEPLOYMENT_COMPLETED

33
Q

What state indicates a failed service deployment?

A

SERVICE_DEPLOYMENT_FAILED

ECS (9 decks)

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