ECS

Question 1

What is ECR?

Answer 1

Elastic Container Registry

Question 2

What does ECR do?

Answer 2

It stores all private Docker images

Question 3

What are the 3 choices for a container management platform?

Answer 3

• ECS
• FarGate
• EKS for Kubernetes

Question 4

How does an EC2 instance get added to an ECS cluster?

Answer 4

The instance runs the ECS Agent, which registers it with the cluster

Question 5

What is an ECS Task Definition?

Answer 5

It is a JSON file that tells ECS how to run a Docker container

Question 6

What 5 main aspects does a Task Definition include?

Answer 6

• Image Name
• Port Binding for container host
• Memory and CPU required
• Environment variables
• Networking information

Question 7

How do you retrieve the login command to use to authenticate your Docker client to your registry in ECR?

Answer 7

run: $(aws ecr get-login –no-include-email –region us-east-1)

Question 8

What command do you use to build your Docker image?

Answer 8

docker build -t

Question 9

What command do you run after the build completes?

Answer 9

The tag command: docker tag : /::

docker tag demo:latest 2343234.dkr.ecr.us-east-1.amazonaws.com/demo:latest

Question 10

What command will push the image?

Answer 10

docker push 2343234.dkr.ecr.us-east-1.amazonaws.com/demo:latest

Question 11

What command will pull the image locally?

Answer 11

docker pull 2343234.dkr.ecr.us-east-1.amazonaws.com/demo:latest

Question 12

What are the 3 flavors of ECS and what do they do?

Answer 12

• ECS Classic allows you to provisionEC2 instances to run your container on
• Fargate which is Serverless ECS
• EKS which is managed Kubernetes by AWS

Question 13

What are 5 characteristics of ECS Classic?

Answer 13

• EC2 instances must be created
• We must configure file /etc/ecs/ecs.config with the cluster name
• The EC2 instance must run the ECS Agent
• EC2 instances can run multiple containers
• ECS tasks can have IAM roles to execute actions against AWS services

Question 14

What 3 things are required for an EC2 instance to run multiple containers?

Answer 14

• You must not select a host port, only a container port
• You should use an ALB with dynamic ort mapping
• The EC2 instance security group must allow traffic from the ALB on all ports

Question 15

For ECS Classic, what level does a security group operate at?

Answer 15

Instance level, not task level