Specifying the ARM architecture in an Amazon ECS task definition - Amazon Elastic Container Service
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Specifying the ARM architecture in an Amazon ECS task definition

To use the ARM architecture, specify ARM64 for the cpuArchitecture task definition parameter.

In the following example, the ARM architecture is specified in a task definition. It's in JSON format.

{
    "runtimePlatform": {
        "operatingSystemFamily": "LINUX",
        "cpuArchitecture": "ARM64"
    },
...
}

In the following example, a task definition for the ARM architecture displays "hello world."

{
 "family": "arm64-testapp",
 "networkMode": "awsvpc",
 "containerDefinitions": [
    {
        "name": "arm-container",
        "image": "arm64v8/busybox",
        "cpu": 100,
        "memory": 100,
        "essential": true,
        "command": [ "echo hello world" ],
        "entryPoint": [ "sh", "-c" ]
    }
 ],
 "requiresCompatibilities": [ "FARGATE" ],
 "cpu": "256",
 "memory": "512",
 "runtimePlatform": {
        "operatingSystemFamily": "LINUX",
        "cpuArchitecture": "ARM64"
  },
 "executionRoleArn": "arn:aws:iam::123456789012:role/ecsTaskExecutionRole"
}