update container definitions without redefine whole task definition in ECS

Question

I trying to update **only `image`** inside ECS task definition:

```
aws ecs register-task-definition --family some-family --container-definitions "$JSON" --execution-role-arn "arn:aws:iam::xxx:role/role-name"
```
Where `$JSON` is definitely  same JSON description as before and only `image` key is changed (because ECR image tag is updated)

And getting error:

```
At least one of 'memory' or 'memoryReservation' must be specified
```

It is super annoying that we have to update whole container definitions just to be able update ECR image tag. But at least this JSON may be easily taken with `describe-task-definition` command.   
However the fact that we have to redefine whole Task Definition every time when Image tag is changed is ridiculous.   
Is it possible to update only `container definitions` or image tag (most perfect) inside current version?

Michael · Answer

The current version of the AWS CLI currently require that you create a new task definition to update the Docker image of your application. You can find this information in the AWS CLI Command Reference documentation.

There is also this issue that is currently open about this in the AWS CLI GitHub repository. You may find useful information there depending on the deployment method you use to update your ECS task. You can also contribute to the discussion if you want.

There is also this [issue](https://github.com/aws/aws-cli/issues/3064#issuecomment-701513960) that is currently open about this in the AWS CLI GitHub repository. You may find useful information there depending on the deployment method you use to update your ECS task. You can also contribute to the discussion if you want.

Ana clara de Sousa Viana · Answer

TASK202303240151581002711250 actions

update container definitions without redefine whole task definition in ECS

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