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aws(学习笔记第三十八课) codepipeline-build-deploy-github-manual

• 使用codepipeline-build-deploy

学习内容：

• 使用codepipeline，★代码库不采用codecommit，而是github
• 使用codebuild
• 使用codedeploy

---

1. 整体架构

1.1 代码链接

• 代码链接(codepipeline-build-deploy-github-manual)
• 同时可以参照aws(学习笔记第二十课) codecommit以及codedeploy进行开发

1.2 全体处理架构

2. 代码分析

2.1 创建ImageRepo，并设定给FargateTaskDef

        # Creates an Elastic Container Registry (ECR) image repositoryimage_repo = ecr.Repository(self, "ImageRepo")# Creates a Task Definition for the ECS Fargate servicefargate_task_def = ecs.FargateTaskDefinition(self, "FargateTaskDef")fargate_task_def.add_container("Container",container_name="web",image=ecs.ContainerImage.from_ecr_repository(image_repo),port_mappings=[{"containerPort": 80}])

注意，这里并没有指定具体的image的URI以及tag，这里只是指定了Image Repo(ECR)。后面会在CodeBuildStage阶段build出来docker image，并且接在CodeDeployStage阶段将该docker image部署到Fargate Service。

2.2 创建CodeBuild project

# CodeBuild project that builds the Docker imagebuild_image = codebuild.Project(self, "BuildImage",build_spec=codebuild.BuildSpec.from_source_filename("buildspec.yaml"),source=codebuild.Source.git_hub(owner="bufanli",    # TODO: Replace with your GitHub usernamerepo="web_app",   # TODO: Replace with your GitHub repository namebranch_or_ref="main",),environment=codebuild.BuildEnvironment(privileged=True),environment_variables={"AWS_ACCOUNT_ID": codebuild.BuildEnvironmentVariable(value=os.getenv('CDK_DEFAULT_ACCOUNT') or ""),"REGION": codebuild.BuildEnvironmentVariable(value=os.getenv('CDK_DEFAULT_REGION') or ""),"IMAGE_TAG": codebuild.BuildEnvironmentVariable(value="latest"),"IMAGE_REPO_NAME": codebuild.BuildEnvironmentVariable(value=image_repo.repository_name),"REPOSITORY_URI": codebuild.BuildEnvironmentVariable(value=image_repo.repository_uri),"TASK_DEFINITION_ARN": codebuild.BuildEnvironmentVariable(value=fargate_task_def.task_definition_arn),"TASK_ROLE_ARN": codebuild.BuildEnvironmentVariable(value=fargate_task_def.task_role.role_arn),"EXECUTION_ROLE_ARN": codebuild.BuildEnvironmentVariable(value=fargate_task_def.execution_role.role_arn)}

这里，设定build_spec文件，在app/buildspec.yml中，

• 设定pre_build登录ecr (‌Amazon Elastic Container Registry（ECR)，方便之后的向ecr进行镜像的登录。

      commands:- echo Logging in to Amazon ECR...- aws --version- aws ecr get-login-password --region $REGION | docker login --username AWS --password-stdin $AWS_ACCOUNT_ID.dkr.ecr.$REGION.amazonaws.com
  

• 进行build处理
  这里的

      commands:- echo Building the Docker image...- docker build -t $IMAGE_REPO_NAME:$IMAGE_TAG .- docker tag $IMAGE_REPO_NAME:$IMAGE_TAG $AWS_ACCOUNT_ID.dkr.ecr.$REGION.amazonaws.com/$IMAGE_REPO_NAME:$IMAGE_TAG
  

  注意，这里的环境给build_spec.yml传递变量都是通过env(环境变量)来传递的。
  可以看到，这里build执行docker build命令，进行docker image的build。
  
• 进行post build处理
  这里的变量也同样是在codebuild中，在cdk的codebuild.project中，通过变量传递过来的。

    commands:- echo Pushing the Docker image...- docker push $AWS_ACCOUNT_ID.dkr.ecr.$REGION.amazonaws.com/$IMAGE_REPO_NAME:$IMAGE_TAG- echo Container image to be used $REPOSITORY_URI:$IMAGE_TAG- sed -i "s|REPOSITORY_URI|${REPOSITORY_URI}|g" taskdef.json- sed -i "s|IMAGE_TAG|${IMAGE_TAG}|g" taskdef.json- sed -i "s|TASK_ROLE_ARN|${TASK_ROLE_ARN}|g" taskdef.json- sed -i "s|EXECUTION_ROLE_ARN|${EXECUTION_ROLE_ARN}|g" taskdef.json- sed -i "s|TASK_DEFINITION_ARN|${TASK_DEFINITION_ARN}|g" appspec.yaml- cat appspec.yaml && cat taskdef.json

2.3 对CodeBuild project赋予权限（ECR的image repo）

        # Grants CodeBuild project access to pull/push images from/to ECR repoimage_repo.grant_pull_push(build_image)

2.4 生成lambda函数触发codebuild的首次执行

2.4.1 生成lambda函数触发codebuild

整体架构如下：

• aws custom resource triggers lambda on create event
• lambda executes code build project
• code build project starts source stage,build stage and deploy stage
  

2.4.2 lambda函数触发codebuild的代码

• CDK代码
  注意，这里赋予了lamba权限，允许执行code build

        # Lambda function that triggers CodeBuild image build projecttrigger_code_build = lambda_.Function(self, "BuildLambda",architecture=lambda_.Architecture.ARM_64,code=lambda_.Code.from_asset("lambda"),handler="trigger-build.handler",runtime=lambda_.Runtime.NODEJS_18_X,environment={"CODEBUILD_PROJECT_NAME": build_image.project_name,"REGION": os.getenv('CDK_DEFAULT_REGION') or ""},# Allows this Lambda function to trigger the buildImage CodeBuild projectinitial_policy=[iam.PolicyStatement(effect=iam.Effect.ALLOW,actions=["codebuild:StartBuild"],resources=[build_image.project_arn])])

• lambda函数代码

const {CodeBuildClient,StartBuildCommand,
} = require("@aws-sdk/client-codebuild");exports.handler = async (event) => {const region = process.env.REGION;const buildProjectName = process.env.CODEBUILD_PROJECT_NAME;const codebuild = new CodeBuildClient({ region: region });const buildCommand = new StartBuildCommand({ projectName: buildProjectName });console.log("Triggering CodeBuild Project...");const buildResponse = await codebuild.send(buildCommand);console.log(buildResponse);return {statusCode: 200,body: "CodeBuild Project building...",};
};

2.4.3 AWS Custom Resource的代码

        # Triggers a Lambda function using AWS SDKtrigger_lambda = custom.AwsCustomResource(self, "BuildLambdaTrigger",install_latest_aws_sdk=True,policy=custom.AwsCustomResourcePolicy.from_statements([iam.PolicyStatement(effect=iam.Effect.ALLOW,actions=["lambda:InvokeFunction"],resources=[trigger_code_build.function_arn],)]),on_create={"service": "Lambda","action": "invoke","physical_resource_id": custom.PhysicalResourceId.of("id"),"parameters": {"FunctionName": trigger_code_build.function_name,"InvocationType": "Event",},},on_update={"service": "Lambda","action": "invoke","parameters": {"FunctionName": trigger_code_build.function_name,"InvocationType": "Event",},})

2.5 创建vpc和ecs cluster

2.5.1 创建vpc

        # Creates VPC for the ECS Clustercluster_vpc = ec2.Vpc(self, "ClusterVpc",ip_addresses=ec2.IpAddresses.cidr(cidr_block="10.75.0.0/16"))# Deploys the cluster VPC after the initial image build triggerscluster_vpc.node.add_dependency(trigger_lambda)

注意，这里创建vpc需要依赖trigger _lambda，只有当trigger lambda的aws custom resource创建好了，才能创建vpc。

2.5.2 创建蓝绿部署

• 蓝绿部署的整体架构
  

  • 【1】利用CodeDepoly服务，开始进行application deploy
  • 【2】生成导入新的application的Green Group
  • 【3】在Application对开发者设定对Green Group的访问的listener
  • 【4】开发者对Green Group进行动作确认，确保生产环境上没有问题
  • 【5】在Application对一般用户设定对访问的listener，让其指向Green Group，设定Blue Group为新的Green Group
  • 【6】删除原来的Blue Group。这里取决于设定的策略，可能不是马上删除。

• 创建ApplicationTargetGroup(blue)蓝色目标组

          target_group_blue = elb.ApplicationTargetGroup(self, "BlueTargetGroup",target_group_name="alb-blue-tg",target_type=elb.TargetType.IP,port=80,vpc=cluster_vpc)
  

  

• 创建ApplicationTargetGroup(green)绿色目标组

      # Creates a new green Target Grouptarget_group_green = elb.ApplicationTargetGroup(self, "GreenTargetGroup",target_group_name="alb-green-tg",target_type=elb.TargetType.IP,port=80,vpc=cluster_vpc)
  

  

2.5 创建Application Loader Balancer

注意，这里 default_target_groups=[target_group_blue]默认的target group设成了blue group。

       # Creates a new green Target Grouptarget_group_green = elb.ApplicationTargetGroup(self, "GreenTargetGroup",target_group_name="alb-green-tg",target_type=elb.TargetType.IP,port=80,vpc=cluster_vpc)# Creates a Security Group for the Application Load Balancer (ALB)albSg = ec2.SecurityGroup(self, "AlbSecurityGroup",vpc=cluster_vpc,allow_all_outbound=True)albSg.add_ingress_rule(peer=ec2.Peer.any_ipv4(),connection=ec2.Port.tcp(80),description="Allows access on port 80/http",remote_rule=False)# Creates a public ALBpublic_alb = elb.ApplicationLoadBalancer(self, "PublicAlb",vpc=cluster_vpc,internet_facing=True,security_group=albSg)# Adds a listener on port 80 to the ALBalb_listener = public_alb.add_listener("AlbListener80",open=False,port=80,default_target_groups=[target_group_blue])

2.6 创建fargate service

2.6.1 创建fargate service

注意，这里直接在创建fargate service的时候，直接创建ecs cluster。并且将task def和ecs cluster联系起来。

        # Creates an ECS Fargate servicefargate_service = ecs.FargateService(self, "FargateService",desired_count=1,service_name="fargate-frontend-service",task_definition=fargate_task_def,cluster=ecs.Cluster(self, "EcsCluster",enable_fargate_capacity_providers=True,vpc=cluster_vpc),# Sets CodeDeploy as the deployment controllerdeployment_controller=ecs.DeploymentController(type=ecs.DeploymentControllerType.CODE_DEPLOY),)

2.6.1 在fargate service上进行application target group的attach

 # Adds the ECS Fargate service to the ALB target group
fargate_service.attach_to_application_target_group(target_group_blue)

2.7 创建code pipeline

2.7.2 codepipe整体架构

2.7.1 创建pipeline artifacts

        # Creates new pipeline artifactssource_artifact = pipeline.Artifact("SourceArtifact")build_artifact = pipeline.Artifact("BuildArtifact")

• source_artifact是由source_stage作成，由build_stage进行使用
• build_artifact是由build_stage作成，由deploy_stage进行使用，并且包括：
  • appspec.yml
  • taskdef.json

2.7.2 创建source stage

        # Creates the source stage for CodePipelinesource_stage = pipeline.StageProps(stage_name="Source",actions=[pipelineactions.GitHubSourceAction(action_name="GitHub",owner='XXXXXX',    # TODO: Replace with your GitHub usernamerepo='web_app',   # TODO: Replace with your GitHub repository namebranch="main",oauth_token=SecretValue.secrets_manager("github-access-token-secret"),output=source_artifact,)])

• 这里，需要设定几个地方：
  • owner 这里是github工程的用户名，这里就是自己的github账号。
  • repo这里是github库的名字。
  • oauth_token，因为需要将aws的url(callback)，注册给github，所以需要 oauth_token进行验证。因为aws的source stage需要检测到github的commit，自动触发code pipeline，所以需要注册url(callback)。
    下面的就是讲本次example程序中的application的部分push到github，创建一个示例的web application。
    
• github的webhooks和codepipeline交互
  
• 在cdk中练习使用aws secret manager
  

2.7.3 创建build stage

        # Creates the build stage for CodePipelinebuild_stage = pipeline.StageProps(stage_name="Build",actions=[pipelineactions.CodeBuildAction(action_name="DockerBuildPush",input=pipeline.Artifact("SourceArtifact"),project=build_image,outputs=[build_artifact])])

• 这里使用source stage生成的source artifact，进行docker build，之后将docker image进行push到aws ecr。
• project设定这里要设定成前面创建的build_image

2.7.4 创建deploy stage

• 整体构造
  
• 创建deployment group

  # Creates a new CodeDeploy Deployment Groupdeployment_group = codedeploy.EcsDeploymentGroup(self, "CodeDeployGroup",service=fargate_service,# Configurations for CodeDeploy Blue/Green deploymentsblue_green_deployment_config=codedeploy.EcsBlueGreenDeploymentConfig(listener=alb_listener,blue_target_group=target_group_blue,green_target_group=target_group_green))
  

• 创建deploy stage

          # Creates the deploy stage for CodePipelinedeploy_stage = pipeline.StageProps(stage_name="Deploy",actions=[pipelineactions.CodeDeployEcsDeployAction(action_name="EcsFargateDeploy",app_spec_template_input=build_artifact,task_definition_template_input=build_artifact,deployment_group=deployment_group)])
  

2.8 创建code pipeline

2.8.1 为code build设定github的confidential

        # Store Github credentials to CodeBuildcodebuild.GitHubSourceCredentials(self, "CodeBuildGitHubCreds",access_token=SecretValue.secrets_manager("github-access-token-secret"))

2.8.2 最终创建pipeline

        # Creates an AWS CodePipeline with source, build, and deploy stagespipeline.Pipeline(self, "BuildDeployPipeline",pipeline_name="ImageBuildDeployPipeline",stages=[source_stage, build_stage, deploy_stage])

3 执行CDK

执行后继续更新。