如何使用 CloudFormation 在现有 EC2 实例上启动容器？

Posted 2023-03-04

【中文标题】如何使用 CloudFormation 在现有 EC2 实例上启动容器？

【英文标题】：How do I start a container on an existing EC2 instance using CloudFormation?

【发布时间】：2016-11-23 21:58:05

【问题描述】：

场景如下：我有 3 个 EC2 实例（A、B 和 C）都运行 ECS 优化的 AMI。我想编写一个带有任务定义的 CloudFormation 模板，让任务只在 A 上运行。我该怎么做？

我见过的所有 CloudFormation 示例都需要创建一个新的 EC2 实例，这不是我想要的。

【参考方案1】：

将任务固定到主机的唯一方法是通过 AWS CLI 使用 start-task：http://docs.aws.amazon.com/cli/latest/reference/ecs/start-task.html

至于通过 Cloudformation 运行 ECS 任务，在 CFT 模板范围内创建和的唯一方法是创建服务。这是一个未经测试的 CFT 模板：

    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Curator runner",
    "Parameters": 
        "CpuUnits": 
            "Type": "Number",
            "Default": 0,
            "Description": "The number of CPU Units to allocate."
        ,
        "Memory": 
            "Type": "Number",
            "Default": 256,
            "Description": "The amount of Memory (MB) to allocate."
        ,
        "ClusterName": 
            "Type": "String",
            "Description": "The cluster to run the ecs tasks on."
        ,
        "DockerImageUrl": 
            "Type": "String",
            "Description": "The URL for the docker image. Example: 354500939573.dkr.ecr.us-east-1.amazonaws.com/something:latest"
        
    ,
    "Resources": 
        "SomeTask": 
            "Type": "AWS::ECS::TaskDefinition",
            "Properties": 
                "ContainerDefinitions": [
                    "Memory": 
                        "Ref": "Memory"
                    ,
                    "Name": "something",
                    "Image": 
                        "Ref": "DockerImageUrl"
                    ,
                    "Cpu": 
                        "Ref": "CpuUnits"
                    
                ],
                "Volumes": []
            
        ,
        "service": 
            "Type": "AWS::ECS::Service",
            "Properties": 
                "Cluster": 
                    "Ref": "ClusterName"
                ,
                "DesiredCount": "1",
                "TaskDefinition": 
                    "Ref": "SomeTask"