AWS ECS error "Container.name contains invalid characters"-CodePudding

I am setting up an ECS task using Terraform and am encountering an error. The error is “Error: failed creating ECS Task Definition (web-2048-task): ClientException: Container.name contains invalid characters.”

Here is my task code:

resource "aws_ecs_task_definition" "aws-ecs-task" {
  family = "${var.app_name}-task"
  container_definitions = file("templates/task.json")

  requires_compatibilities = ["FARGATE"]
  network_mode             = "awsvpc"
  memory                   = "2048" #2 GB
  cpu                      = "1024" #1 vCPU
  execution_role_arn       = aws_iam_role.ecsTaskExecutionRole.arn
  task_role_arn            = aws_iam_role.ecsTaskExecutionRole.arn

  tags = {
    Name        = "${var.app_name}-ecs-td"
    Environment = var.app_environment
  }
}

Here is the json task definition code:

[{
    "container_name": "${var.app_name}",
    "name": "${var.app_name}",
        "image": "${data.aws_ecr_repository.aws-ecr.repository_url}:latest",
        "essential": true
    },

   {
        "portMappings": [{
            "containerPort": 80,
            "hostPort": 80
        }],
        "cpu": 1024,
        "memory": 2048,
        "networkMode": "awsvpc"
    }
]

I tried replacing the ${var.app_name} in the json to be the name of the app, which is ‘web-2048`, but the error changes to “Container.name should not be null or empty.” When I change the app name back to a variable, then I get the above error again.

I checked the Terraform Registry for aws_ecs_task_definition but didn’t see any info regarding container names. Same for the Aws developer guide section on task definitions but didn't find anything that helped.

Can I get some guidance on this?

CodePudding user response：

There is no "container_name" attribute on ECS container definitions. There is only a "name" attribute. According to the documentation:

The name of a container. Up to 255 letters (uppercase and lowercase), numbers, hyphens, and underscores are allowed.

I would delete the container_name attribute, and try setting name to something you know should be valid.

CodePudding user response：

My guess is the issue lies within the substitution for "image": "${data.aws_ecr_repository.aws-ecr.repository_url}:latest"

You might want to echo / validate (docker pull the image with the echoed string) if the substitution works correctly such that the image is substituted with the right values.