AWS ECS FARGATE - unable to pull image from docker private repository - amazon-web-services

Question

I'm trying to create an ECS Cluster with a task pulling image from my private docker repository.
I created a secret in AWS SecretsManager.
I created policy with following parameters.
"Action": "secretsmanager:GetSecretValue",
"Resource": "arn:aws:secretsmanager:eu-west-1:123456789:secret:docker_private_repo-123456"
I added new policy to "ecsTaskExecutionRole" that is created by ECS Task Definition process.
But unfortunately, task always stopped.
I tried to do everything in following tutorials.
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/private-auth.html
https://aws.amazon.com/blogs/compute/introducing-private-registry-authentication-support-for-aws-fargate/
I'm getting this error.
"Stopped reason ResourceInitializationError: unable to pull secrets or registry auth: execution resource retrieval failed: unable to get registry auth from asm: service call has been retried 1 time(s): unable to unmarshal secret value of authorization data from asm: i..."
Launch type FARGATE
Platform version 1.4.0
Can anyone help me, please.
Thank you..
Task Definition:
{
"ipcMode": null,
"executionRoleArn": "arn:aws:iam::123456789:role/ecsTaskExecutionRole",
"containerDefinitions": [
{
"dnsSearchDomains": null,
"environmentFiles": null,
"logConfiguration": {
"logDriver": "awslogs",
"secretOptions": null,
"options": {
"awslogs-group": "/ecs/WebFTask",
"awslogs-region": "eu-west-1",
"awslogs-stream-prefix": "ecs"
}
},
"entryPoint": null,
"portMappings": [
{
"hostPort": 80,
"protocol": "tcp",
"containerPort": 80
}
],
"command": null,
"linuxParameters": null,
"cpu": 0,
"environment": [],
"resourceRequirements": null,
"ulimits": null,
"repositoryCredentials": {
"credentialsParameter": "arn:aws:secretsmanager:eu-west-1:123456789:secret:docker_private_repo-123456"
},
"dnsServers": null,
"mountPoints": [],
"workingDirectory": null,
"secrets": null,
"dockerSecurityOptions": null,
"memory": null,
"memoryReservation": 512,
"volumesFrom": [],
"stopTimeout": null,
"image": "docker.io/username/imageName:latest",
"startTimeout": null,
"firelensConfiguration": null,
"dependsOn": null,
"disableNetworking": null,
"interactive": null,
"healthCheck": null,
"essential": true,
"links": null,
"hostname": null,
"extraHosts": null,
"pseudoTerminal": null,
"user": null,
"readonlyRootFilesystem": null,
"dockerLabels": null,
"systemControls": null,
"privileged": null,
"name": "WebContariner"
}
],
"placementConstraints": [],
"memory": "2048",
"taskRoleArn": "arn:aws:iam::123456789:role/ecsTaskExecutionRole",
"compatibilities": [
"EC2",
"FARGATE"
],
"taskDefinitionArn": "arn:aws:ecs:eu-west-1:123456789:task-definition/WebFTask:6",
"family": "WebFTask",
"requiresAttributes": [
{
"targetId": null,
"targetType": null,
"value": null,
"name": "com.amazonaws.ecs.capability.logging-driver.awslogs"
},
{
"targetId": null,
"targetType": null,
"value": null,
"name": "ecs.capability.execution-role-awslogs"
},
{
"targetId": null,
"targetType": null,
"value": null,
"name": "com.amazonaws.ecs.capability.docker-remote-api.1.19"
},
{
"targetId": null,
"targetType": null,
"value": null,
"name": "ecs.capability.private-registry-authentication.secretsmanager"
},
{
"targetId": null,
"targetType": null,
"value": null,
"name": "com.amazonaws.ecs.capability.docker-remote-api.1.21"
},
{
"targetId": null,
"targetType": null,
"value": null,
"name": "com.amazonaws.ecs.capability.task-iam-role"
},
{
"targetId": null,
"targetType": null,
"value": null,
"name": "com.amazonaws.ecs.capability.docker-remote-api.1.18"
},
{
"targetId": null,
"targetType": null,
"value": null,
"name": "ecs.capability.task-eni"
}
],
"pidMode": null,
"requiresCompatibilities": [
"FARGATE"
],
"networkMode": "awsvpc",
"cpu": "1024",
"revision": 6,
"status": "ACTIVE",
"inferenceAccelerators": null,
"proxyConfiguration": null,
"volumes": []
}
ecsTaskExecutionRole:
Policy 1:
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"ecr:GetAuthorizationToken",
"ecr:BatchCheckLayerAvailability",
"ecr:GetDownloadUrlForLayer",
"ecr:BatchGetImage",
"logs:CreateLogStream",
"logs:PutLogEvents"
],
"Resource": "*"
}
]
}
Policy 2:
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "VisualEditor0",
"Effect": "Allow",
"Action": "secretsmanager:GetSecretValue",
"Resource": "arn:aws:secretsmanager:eu-west-1:123456789:secret:docker_private_repo-123456c"
}
]
}

Answer 1

Your task definition shows lack of task role:
"taskRoleArn": null,
Seems you created it, but you haven't assigned it to the task.