ECS Resource Limits Missing

What this rule checks

Detects ECS task definitions without CPU/memory limits.

How to fix it

1. 1Set CPU and memory at task level for Fargate
2. 2Set container-level memory limits for EC2

import { App, Stack } from 'aws-cdk-lib';
import { Construct } from 'constructs';
import * as ecs from 'aws-cdk-lib/aws-ecs';

// FLAGGED: no task-level sizing and no container CPU/memory limits.
new ecs.CfnTaskDefinition(this, 'Task', {
  containerDefinitions: [
    {
      name: 'app',
      image: 'nginx:1.27.3',
      logConfiguration: {
        logDriver: 'awslogs',
        options: { 'awslogs-group': '/ecs/app', 'awslogs-region': 'us-east-1', 'awslogs-stream-prefix': 'app' },
      },
    },
  ],
});

import { App, Stack } from 'aws-cdk-lib';
import { Construct } from 'constructs';
import * as ecs from 'aws-cdk-lib/aws-ecs';

// FIXED: task-level CPU and memory sizing (Fargate-style).
new ecs.CfnTaskDefinition(this, 'Task', {
  cpu: '256',
  memory: '512',
  containerDefinitions: [
    {
      name: 'app',
      image: 'nginx:1.27.3',
      logConfiguration: {
        logDriver: 'awslogs',
        options: { 'awslogs-group': '/ecs/app', 'awslogs-region': 'us-east-1', 'awslogs-stream-prefix': 'app' },
      },
    },
  ],
});

CDK Insights pinpoints the exact file and line in your CDK source for every finding, so you can jump straight to the fix.

Affected resource types

Intentional? Suppress this finding

Sometimes a flag is deliberate — a genuinely public endpoint, say. You can dismiss ecs-resources-missing and the reason is kept in the report, not silently hidden.

In .cdk-insights.json:

{
  "ignoreRules": [
    { "id": "ecs-resources-missing", "reason": "Why this is intentional" }
  ]
}

Or inline in your CDK code:

Validations.of(scope).acknowledge({
  id: 'cdk-insights::ecs-resources-missing',
  reason: 'Why this is intentional',
});

Use the rule ID ecs-resources-missing shown above — not the CDK-* ID from SARIF / GitHub code scanning. To dismiss every finding on one construct instead, use ignorePaths. Suppression docs →

More ECS rules