Docker Container not working in AWS ECS using AWS ECR

Question

I've single docker container and have to deploy on AWS Cloud using AWS ECR with Elastic Beanstalk. I'm using Dockerrun.aws.json file to provide the information about repository details. I have pushed my image to my docker hub and Elastic Container Registry.

Using DockerHub in ECS, It can pull the docker image from docker hub and starts the container without any issues and working the app as expected. On the other hand, the container gets stopped when the image pulled from AWS ECR Repository for the same application. The deployment gets failed for the reason: Essential container in task exited

Dockerrun.aws.json

{
    
    "containerDefinitions": [
        {
            "essential": true,
            "image": "01234567891.dkr.ecr.us-east-1.amazonaws.com/app:1",
            "memory": 512,
            "name": "web",
            "portMappings": [
                {
                    "containerPort": 5000,
                    "hostPort": 80
                }
            ]
        }
    ],
    "family": "",
    "volumes": [],
    "AWSEBDockerrunVersion": "2"
}

I logged into the instance and tried to get the logs of the containers. But, I got this error standard_init_linux.go:211: exec user process caused "exec format error"

Dockerfile

FROM python:3.4-alpine
ADD . /code
WORKDIR /code
RUN pip install -r requirements.txt
CMD ["python", "app.py"]

You've given no details on what you're doing, so it's pretty much impossible to give you any advice. Please provide a minimal reproducible example and more than just an error message. — David Maze
Could it be a permissions issue, the container never gets downloaded from ECR? You could try another docker image to rule this out. — peter n
@petern I've tried with different image tag which never exists and it shows CannotPullContainerError but with the existing image tag, the error is different. — Kumaresh Babu N S
Please check your CloudWatch logs. If you're getting Essential container in task exited, there should be something in logs describing the reason, why. For the exec format error, see stackoverflow.com/questions/36544293/…. Seems like there's an error in your Dockerfile. — lexicore

Adiii Adiii · Accepted Answer · 2020-07-10T14:14:51

Seems like there is depended on docker container in task definition or the docker-compose file.

This error occur you have container B that is opened on A and A is esetional for services, so container B will automatically exit.

You need to debug why A is exit.

Essential container in task exited

If a container marked as essential in task definitions exits or dies, that can cause a task to stop. When an essential container exiting is the cause of a stopped task, the Step 6 can provide more diagnostic information as to why the container stopped.

stopped-task-errors

Docker Container not working in AWS ECS using AWS ECR

2 Answers