通过 Cloudformation、CodeBuild 和 CodePipeline 将 python 包部署到 AWS Lambda

Question

我想为我的 AWS 基础设施和 AWS Lambda 函数设置一个 CI/CD 管道。这个想法是让一切都在代码中，版本控制和自动化。我只想 git push 到存储库并让 CodePipeline 从那里接管，更新我的基础设施，运行测试，如果成功，用最新代码更新我的 Lambda 函数。

我的 CloudFormation 模板基于 this excellent example。它看起来像这样：

AWSTemplateFormatVersion: 2010-09-09
Description: playground pipeline 1
Parameters:
  SourceRepositoryName:
    Type: String
    Default: lambda-playground
  SourceBranchName:
    Type: String
    Default: master

Resources:
  ArtifactsBucket:
    Type: AWS::S3::Bucket
    DependsOn: CloudFormationRole
    DeletionPolicy: Delete
    Properties:
      BucketName: lambda-playground-artifacts

  CodeBuildRole:
    Type: AWS::IAM::Role
    DependsOn: CloudFormationRole
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Action:
              - sts:AssumeRole
            Principal:
              Service:
                - codebuild.amazonaws.com
      Policies:
        - PolicyName: ServiceRole
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Sid: CloudWatchWriteLogsPolicy
                Effect: Allow
                Action:
                  - logs:CreateLogGroup
                  - logs:CreateLogStream
                  - logs:PutLogEvents
                Resource: '*'
              - Sid: CodeCommitPullPolicy
                Effect: Allow
                Action:
                  - codecommit:GitPull
                Resource: '*'
              - Sid: S3GetObjectPolicy
                Effect: Allow
                Action:
                  - s3:GetObject
                  - s3:GetObjectVersion
                Resource: '*'
              - Sid: S3PutObjectPolicy
                Effect: Allow
                Action:
                  - s3:PutObject
                Resource: '*'

  CodePipelineRole:
    Type: AWS::IAM::Role
    DependsOn: CloudFormationRole
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Action:
              - sts:AssumeRole
            Principal:
              Service:
                - codepipeline.amazonaws.com
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/AdministratorAccess

  CloudFormationRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Action:
              - sts:AssumeRole
            Principal:
              Service:
                - cloudformation.amazonaws.com
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/AdministratorAccess

  CodeCommitRepository:
    Type: AWS::CodeCommit::Repository
    Properties:
      RepositoryName: !Ref SourceRepositoryName

  CodeBuildProject:
    Type: AWS::CodeBuild::Project
    DependsOn: CloudFormationRole
    Properties:
      Description: A playground of Lambda
      Artifacts:
        Type: CODEPIPELINE
      Environment:
        ComputeType: BUILD_GENERAL1_SMALL
        Image: aws/codebuild/python:2.7.12
        Type: LINUX_CONTAINER
      Name: lambda-playground
      ServiceRole: !GetAtt CodeBuildRole.Arn
      Source:
        Type: CODEPIPELINE
      TimeoutInMinutes: 5

  CodePipeline:
    Type: AWS::CodePipeline::Pipeline
    Properties:
      ArtifactStore:
        Type: S3
        Location: !Ref ArtifactsBucket
      Name: !Ref AWS::StackName
      RestartExecutionOnUpdate: true
      RoleArn: !GetAtt CodePipelineRole.Arn
      Stages:
        - Name: Source
          Actions:
            - Name: Source
              ActionTypeId:
                Category: Source
                Owner: AWS
                Provider: CodeCommit
                Version: 1
              Configuration:
                RepositoryName: !Ref SourceRepositoryName
                BranchName: !Ref SourceBranchName
              OutputArtifacts:
                - Name: SourceOutput
        - Name: PipelineDeploy
          Actions:
            - Name: UpdatePipeline
              ActionTypeId:
                Category: Deploy
                Owner: AWS
                Provider: CloudFormation
                Version: 1
              Configuration:
                ActionMode: CREATE_UPDATE
                Capabilities: CAPABILITY_IAM
                RoleArn: !GetAtt CloudFormationRole.Arn
                StackName: !Ref AWS::StackName
                TemplatePath: SourceOutput::infra.yml
              InputArtifacts:
                - Name: SourceOutput
        - Name: Build
          Actions:
            - Name: BuildAndTest
              ActionTypeId:
                Category: Build
                Owner: AWS
                Provider: CodeBuild
                Version: 1
              Configuration:
                ProjectName: !Ref CodeBuildProject
              InputArtifacts:
                - Name: SourceOutput
              OutputArtifacts:
                - Name: BuildOutput

  LambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        S3Bucket: !Ref ArtifactsBucket
        S3Key: !Ref BuildOutput # DOES NOT WORK
      FunctionName: playground-fc
      Handler: src.main.handler
      # TODO: Role: foo
      Runtime: python2.7

Outputs:
  ArtifactsBucketURL:
    Description: Artifacts bucket URL
    Value: !GetAtt ArtifactsBucket.WebsiteURL
  RepositoryURL:
    Description: SSH URL of the repository
    Value: !GetAtt CodeCommitRepository.CloneUrlSsh

所以我有一个包含 3 个阶段的 CodePipeline - Source，它从 CodeCommit 存储库中获取代码，PipelineDeploy，它在必要时更新我的 CloudFormation 堆栈，Build，它运行配置的 CodeBuild 项目。

我的 buildspec.yml 在这里：

version: 0.1

phases:
  install:
    commands:
      - pip install -r requirements.txt -t lib
  pre_build:
    commands:
      - python lib/pytest.py src
artifacts:
  type: zip
  files:
    - src/**/*
    - lib/**/*

它只是安装必要的库，通过 pytest 运行测试并创建部署 zip。此 zip 文件是 Build 阶段的 OutputArtifact，并存储在 ArtifactsBucket 中。但是，每次它都会获得一个唯一的名称（例如 dfVV6Uh），这是有道理的，但我不知道如何在 LambdaFunction -> Properties -> Code -> S3Key 字段中引用它。

所以我的问题是，如何创建 stack/pipeline，在完成所有步骤后，将最新版本部署到我的 AWS Lambda 函数？有没有办法可以使用 CodeDeploy 来做到这一点？这里的最佳做法是什么？

Answer 1

有一个示例说明如何实现类似的功能（通过 CodePipeline/CodeBuild 部署 lambda 函数）。 http://docs.aws.amazon.com/lambda/latest/dg/automating-deployment.html

这个例子是用NodeJS写的lambda函数，但是基本思路是一样的。在通过 CodeBuild 构建工件并让 CodePipeline 在阶段内管理工件传播后，您可以使用 CloudFormation deploy/update lambda 函数。

如果有帮助请告诉我。

Answer 2

您可以使用 Parameter Override with Fn::GetArtifactAtt 和 ObjectKey 属性将 AWS CodePipeline 生成的工件 .zip 的名称动态提供给您的 CloudFormation 部署操作。

使用您的示例，UpdatePipeline CloudFormation 部署操作的配置如下所示：

Configuration:
  ActionMode: CREATE_UPDATE
  Capabilities: CAPABILITY_IAM
  RoleArn: !GetAtt CloudFormationRole.Arn
  StackName: !Ref AWS::StackName
  TemplatePath: SourceOutput::infra.yml
  ParameterOverrides:
    {
      "LambdaKey" : { "Fn::GetArtifactAtt" : ["LambdaFunctionSource", "ObjectKey"]}
    }
InputArtifacts:
- Name: SourceOutput
- Name: BuildOutput

然后，在您的 CloudFormation 堆栈模板中声明并引用 LambdaKey 参数：

Parameters:
  LambdaKey:
    Type: String
  # ...
Resources:
  LambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      Code:
        S3Bucket: !Ref ArtifactsBucket
        S3Key: !Ref LambdaKey
      # ...

通过 Cloudformation、CodeBuild 和 CodePipeline 将 python 包部署到 AWS Lambda

Deploying a python package to AWS Lambda via Cloudformation, CodeBuild and CodePipeline

amazon-web-services

aws-lambda

amazon-cloudformation

aws-codepipeline

aws-codebuild