ECS service auto scaling in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is ECS service auto scaling?

ECS service auto scaling automatically adjusts the number of running tasks in your ECS service based on demand to keep your application responsive and cost-efficient.

beginner

Which AWS service manages ECS service auto scaling policies?

AWS Application Auto Scaling manages ECS service auto scaling policies by adjusting the desired count of tasks based on scaling rules.

intermediate

What is a target tracking scaling policy in ECS service auto scaling?

A target tracking scaling policy adjusts the number of tasks to keep a specific metric, like CPU utilization, at a target value automatically.

beginner

Why is it important to set minimum and maximum task counts in ECS service auto scaling?

Setting minimum and maximum task counts prevents your service from scaling too low (causing downtime) or too high (wasting resources and money).

beginner

How does ECS service auto scaling improve application availability?

By automatically adding tasks when demand increases and removing tasks when demand decreases, ECS service auto scaling keeps the application responsive and available.

What does ECS service auto scaling adjust automatically?

A Amount of storage in S3

B Number of running tasks in a service

C Size of EC2 instances

D Number of VPC subnets

ECS service auto scaling changes the number of running tasks to match demand.

Which metric is commonly used in target tracking scaling policies for ECS?

A Network latency

B Number of S3 buckets

C CPU utilization

D Disk IOPS

CPU utilization is a common metric to keep at a target level for scaling ECS tasks.

What AWS service do you configure to enable ECS service auto scaling?

A Application Auto Scaling

B AWS Lambda

C Amazon RDS

D AWS CloudTrail

Application Auto Scaling manages scaling policies for ECS services.

Why should you set a maximum task count in ECS auto scaling?

A To avoid excessive resource use and cost

B To increase network speed

C To reduce storage costs

D To limit API calls

A maximum task count prevents scaling beyond what is needed, saving cost and resources.

What happens if ECS service auto scaling is not configured?

A S3 storage scales automatically

B Tasks automatically scale perfectly

C EC2 instances scale automatically

D Tasks stay fixed and may not handle demand changes

Without auto scaling, the number of tasks stays fixed and may cause slow response or wasted resources.

Explain how ECS service auto scaling works and why it is useful.

Think about how a restaurant adds or removes staff based on customers.

Describe the role of Application Auto Scaling in ECS service auto scaling.

It’s like the manager who decides when to add or remove workers.