amazon-web-services - AWS ECS 无法放置任务，因为没有容器实例满足其所有要求

Question

我正在使用 .NET Core WEBAPI 和以下 Dockerfile

FROM microsoft/dotnet:sdk AS build-env
WORKDIR /app

# Copy csproj and restore as distinct layers
COPY *.csproj ./
RUN dotnet restore

# Copy everything else and build
COPY . ./
RUN dotnet publish -c Release -o out

# Build runtime image
FROM microsoft/dotnet:aspnetcore-runtime
WORKDIR /app
COPY --from=build-env /app/out .
ENTRYPOINT ["dotnet", "DummyService.dll"]

在我的cloudformation模板中，ECS部分是这样的

  dummyWebApiEcsTaskDefinition:
Type: AWS::ECS::TaskDefinition
Properties:
  Family: !Ref AWS::StackName
  TaskRoleArn: !GetAtt dummyWebApiIamRole.Arn
  ContainerDefinitions:
    - Name: !Ref AWS::StackName
      Image: MY IMAGE URL
      DnsSearchDomains:
        - !Join [".", [{"Fn::ImportValue": !Sub "${accountStackName}-${AWS::Region}-envName"}, "connected", !If [chinaPartition, "TEST", "CORP"], "cloud"]]
      LogConfiguration:
        LogDriver: splunk
        Options:
          splunk-token: {"Fn::ImportValue": !Sub "${splunkHECStackName}-${AWS::Region}-SplunkHECToken"}
          splunk-url: "http://splunk-forwarder:8088"
          splunk-insecureskipverify: True
          tag: !Ref AWS::StackName
          splunk-format: json
          splunk-source: !Ref AWS::StackName
          splunk-sourcetype: AWS:ECS
      EntryPoint: []
      PortMappings:
        - ContainerPort: 5000
      Command: []
      Cpu: 0
      Environment:
        - Name: BindAddress
          Value: http://0.0.0.0:5000
        - Name: MinLogLevel
          Value: !If [isProduction, "Information", "Debug"]
      Ulimits: []
      DnsServers: []
      MountPoints: []
      DockerSecurityOptions: []
      Memory: 512
      VolumesFrom: []
      Essential: true
      ExtraHosts: []
      ReadonlyRootFilesystem: false
      DockerLabels: {}
      Privileged: false

  dummyEcsService:
Type: AWS::ECS::Service
DependsOn:
  - dummyWebApiIamRole
  - dummyInternalAlb
  - dummyAlbTargetGroup
Properties:
  Cluster:
    Fn::ImportValue: !Sub "cld-core-ecs-${AWS::Region}-ECSCluster"
  DeploymentConfiguration:
    MaximumPercent: 200
    MinimumHealthyPercent: 50
  DesiredCount: 2
  LoadBalancers:
    - ContainerName: !Ref AWS::StackName
      ContainerPort: 5000
      TargetGroupArn: !Ref dummyAlbTargetGroup
  PlacementStrategies:
    - Type: spread
      Field: attribute:ecs.availability-zone
  TaskDefinition: !Ref dummyWebApiEcsTaskDefinition
  ServiceName: !Ref AWS::StackName
  Role: !Sub "arn:${AWS::Partition}:iam::${AWS::AccountId}:role/aws-service-role/ecs.amazonaws.com/AWSServiceRoleForECS"

部署无法完成，我可以在 ECS 服务事件选项卡中看到此错误

service cld-dummy-test was unable to place a task because no container instance met all of its requirements. Reason: No Container Instances were found in your cluster.

Answer 1

我终于明白了这一点。下面的错误消息表明该集群中没有 EC2，因此无法启动任何容器。我们没有使用 Fargate。

service cld-dummy-test was unable to place a task because no container instance met all of its requirements. Reason: No Container Instances were found in your cluster.

要将 EC2 注册到集群，您需要遵循这篇 AWS 文章。
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/launch_container_instance.html

请注意，您启动的 EC2 需要具有以下用户数据才能注册。

#!/bin/bash
echo ECS_CLUSTER=your_cluster_name >> /etc/ecs/ecs.config

完成上述操作后，您应该不会看到“无容器”的错误信息。但是，如果您像我一样，在模板中有 splunk 日志记录部分。你会遇到一个不同的问题，它说没有容器可以用于任务，因为它缺少一个属性。这是一个相当模糊的消息，属性可以是任务定义页面底部列出的任何内容。

就我而言，它是 splunk 日志记录。需要将 splunk 驱动程序添加到 EC2 实例。由于我后来发现我们不再需要 splunk，所以我删除了 splunk 部分。但是如果你想这样做，你可能需要将下面的行添加到你的用户数据中。

ECS_AVAILABLE_LOGGING_DRIVERS=["splunk","awslogs"]

我希望这可以帮助别人。