resource:memory error when trying to run an ECS task using AWS CLI

Question

I'm trying to set up CI with AWS ECS and docker. I use Codeship as a CI tool, but that should not really matter much.

I do the following steps in a shell script:

• build an image with my Dockerfile,
• push the image to ECS repository,
• push a task-definition.json to ECS aws ecs register-task-definition --family postgraphile --cli-input-json file:///deploy/ecs-task-def.json --region us-east-2
• run the ECS task aws ecs run-task --task-definition postgraphile --cluster testcluster --region us-east-2

Shell script runs successfully, however I see an error in output after I try to run my ECS task:

{
    "tasks": [],
    "failures": [
        {
            "arn": "arn:aws:ecs:us-east-2:99999999999:container-instance/050ab165-7669-45d5-8be7-d990cf4fff42",
            "reason": "RESOURCE:MEMORY"
        }
    ]
}

my ecs-task-def.json:

{
  "containerDefinitions": [
    {
      "name": "postgraphile-container",
      "image": "999999999999.dkr.ecr.us-east-2.amazonaws.com/test-repository",
      "memory": 500,
      "essential": true,
      "portMappings": [
        {
          "hostPort": 5000,
          "containerPort": 5000
        }
      ]
    }
  ],
  "volumes": [],
  "memory": "900",
  "cpu": "128",
  "placementConstraints": [],
  "family": "postgraphile",
  "taskRoleArn": ""
}

I think I already checked all the memory limits.. am I missing anything?

UPDATE: After couple of reboots of ec2 instance I can finally run the ecs task with no errors. After running task several times, the error returns

Answer 1

There are limited values accepted for CPU and memory. Check the docs for the supported values:

CPU value	Memory value (MiB)
256 (.25 vCPU)	512 (0.5GB), 1024 (1GB), 2048 (2GB)
512 (.5 vCPU)	1024 (1GB), 2048 (2GB), 3072 (3GB), 4096 (4GB)
1024 (1 vCPU)	2048 (2GB), 3072 (3GB), 4096 (4GB), 5120 (5GB), 6144 (6GB), 7168 (7GB), 8192 (8GB)
2048 (2 vCPU)	Between 4096 (4GB) and 16384 (16GB) in increments of 1024 (1GB)
4096 (4 vCPU)	Between 8192 (8GB) and 30720 (30GB) in increments of 1024 (1GB)

https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-cpu-memory-error.html