Amazon Web Services DOP-C02 Exam With Confidence Using Practice Dumps

When using the awslogs log driver with Amazon ECS on EC2, CloudWatch Logs permissions must be granted to the ECS container instance IAM role, not the task definition or infrastructure role. The ECS agent running on the EC2 instances is responsible for creating log streams and pushing log events to Amazon CloudWatch Logs on behalf of the containers.

In this scenario, the task definition is correctly configured to automatically create the log group (awslogs-create-group: true) and send logs to the specified Region. However, the error occurs because the EC2 container instances do not have sufficient IAM permissions to perform the required CloudWatch Logs API calls. As a result, ECS cannot place the task, and it reports that no container instance meets the requirements.

According to AWS documentation, the container instance IAM role must include the following permissions when using the awslogs driver:

logs:CreateLogStream

logs:PutLogEvents

(and, when creating log groups automatically) logs:CreateLogGroup

Option C correctly addresses the root cause by updating the container instance IAM role. Option A is incorrect because the ECS infrastructure or service role is not used to write logs. Option B is unrelated to permissions and does not resolve the issue. Option D would fail because the log group does not already exist, causing task startup to fail.

Therefore, modifying the container instance IAM role is the correct solution.

Activating S3 server access logging and using Amazon Athena to create an external table with the log files is the easiest and most cost-effective way to analyze access patterns. This option requires minimal setup and allows for quick analysis of the access patterns with SQL queries. Additionally, Amazon Athena scales automatically to match the query load, so there is no need for additional infrastructure provisioning or management.

Refactor User Data to Use cfn-init and cfn-hup:

cfn-init helps to bootstrap the instance, installing packages and starting services.

cfn-hup is a daemon that can monitor metadata changes and re-apply configurations when necessary.

Example user data script with cfn-init:

#!/bin/bash

yum update -y

yum install -y aws-cfn-bootstrap

/opt/aws/bin/cfn-init -v --stack ${AWS::StackName} --resource WebServer --region ${AWS::Region}

/opt/aws/bin/cfn-hup

Use Systems Manager State Manager:

State Manager can automatically apply an AWS Systems Manager document to instances at regular intervals, ensuring configurations are kept up-to-date.

Steps:

Create an SSM document that installs and configures your application.

Use State Manager to associate this document with your EC2 instances.

Example SSM document:

{

"schemaVersion": "2.2",

"description": "Install My Application",

"mainSteps": [

{

"action": "aws:runShellScript",

"name": "installApplication",

"inputs": {

"runCommand": [

"yum install -y my-application"

]

}

}

]

}

Create State Manager association:

aws ssm create-association --name "InstallMyApplication" --instance-id --document-version "\$LATEST"