描述任务定义不返回主机名值答案

【问题标题】：describe-task-definition not returning hostname value描述任务定义不返回主机名值
【发布时间】：2019-05-04 12:09:40
【问题描述】：

我需要通过 CLI 查找我的 ECS 任务的主机名，根据亚马逊文档，该主机名应该可以通过 CLI 获得：

https://docs.aws.amazon.com/cli/latest/reference/ecs/describe-task-definition.html

但是，当我运行 describe-task-definition 时，它没有返回信息：

> 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
    }
}

我不确定我需要做什么才能包含该值。我确认我正在运行最新的 CLI。

谢谢！

【问题讨论】：

任务定义只是关于如何创建任务的说明。您需要描述从任务定义和运行它的容器实例创建的实际任务，以了解任务运行位置的 IP/主机名。
谢谢，但 describe-tasks 不包含主机名信息。 describe-task-definition 信息中包含的主机名是什么？还有其他方法可以确定吗？

标签： amazon-web-services aws-cli amazon-ecs

【解决方案1】：

首先，主机名没有被定义为任务定义。它定义为任务定义中的容器定义。其次，没有默认主机名，您必须在创建任务定义修订时在容器定义中明确定义主机名。默认情况下，它使用容器 id 作为主机名。

【讨论】：