describe-task-definition not returning hostname value - amazon-web-services

Question

I have the need to find the hostname of my ECS task via the CLI, which according to the Amazon documentation should be available via the CLI:
https://docs.aws.amazon.com/cli/latest/reference/ecs/describe-task-definition.html
However, when I run the describe-task-definition it is not returning the information:
> aws ecs describe-task-definition --task-definition my-test-task:1
{
"taskDefinition": {
"status": "ACTIVE",
"networkMode": "bridge",
"family": "my-test-task",
"placementConstraints": [],
"requiresAttributes": [
{
"name": "com.amazonaws.ecs.capability.ecr-auth"
},
{
"name": "com.amazonaws.ecs.capability.docker-remote-api.1.21"
}
],
"volumes": [
{
"host": {
"sourcePath": "/opt/cf/rails-app/public/"
},
"name": "ruby-on-rails-public-volume"
}
],
"taskDefinitionArn": "arn:aws:ecs:us-east-1:accountId:task-definition/my-test-task:1",
"containerDefinitions": [
{
"memoryReservation": 1024,
"environment": [
{
"name": "DATABASE_HOSTNAME",
"value": "hostname"
},
{
"name": "PUMA_WORKERS",
"value": "2"
},
{
"name": "RAILS_ENV",
"value": "staging"
},
{
"name": "DATABASE_NAME",
"value": "ruby-on-rails"
},
{
"name": "DEBIAN_FRONTEND",
"value": "noninteractive"
},
{
"name": "PORT",
"value": "8080"
},
{
"name": "LANG",
"value": "en_US.UTF-8"
},
{
"name": "DATABASE_PASSWORD",
"value": "cf"
},
{
"name": "DATABASE_USER",
"value": "cf"
},
{
"name": "PUMA_MAX_THREADS",
"value": "6"
}
],
"name": "my-test-task",
"mountPoints": [
{
"sourceVolume": "ruby-on-rails-public-volume",
"containerPath": "/opt/cf/rails-app/public/"
}
],
"image": "accountId.dkr.ecr.us-east-1.amazonaws.com/cf/rails:latest",
"cpu": 1024,
"portMappings": [
{
"protocol": "tcp",
"containerPort": 8080,
"hostPort": 8080
}
],
"command": [
"puma",
"-C",
"config/puma.rb"
],
"essential": true,
"volumesFrom": []
}
],
"revision": 1
}
}
I am not sure what I need to do to get that value included. I confirmed I am running the latest CLI.
Thanks!

Answer 1

First of all the hoostname is not defined to task definition. Its defined to container definition inside task definition. Secondly, There is no default hostname, You have to explicitly define the hostname in the container definition while creating task definition revision. By default, it uses container id as the hostname.