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タスク定義をプッシュした最新のイメージに変更するだけのbuildspec ファイル

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#概要
CodeBuild 内で、イメージのビルドとECR にプッシュし、タスク定義のコンテナのイメージURIの変更だけをして、サービスにはデプロイしないケースを想定した buildspec ファイルです。

実行に必要なビルドプロジェクトの環境変数

名前 説明
AWS_ACCOUNT_ID AWS アカウントID
IMAGE_REPO_NAME ECRのリポジトリ名
TASK_DEFINITION タスク定義名

実行に必要なIAM ポリシー

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ecs:*"
            ],
            "Resource": "*"
        },
        {
            "Action": "iam:PassRole",
            "Effect": "Allow",
            "Resource": [
                "*"
            ],
            "Condition": {
                "StringLike": {
                    "iam:PassedToService": "ecs-tasks.amazonaws.com"
                }
            }
        }
    ]
}

buildspec.yml

version: 0.2

phases:
  pre_build:
    commands:
      - echo Logging in to Amazon ECR...
      - aws --version
      - echo $AWS_DEFAULT_REGION
      - $(aws ecr get-login --region $AWS_DEFAULT_REGION --no-include-email)
      - REPOSITORY_URI=$AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$IMAGE_REPO_NAME
      - COMMIT_HASH=$(echo $CODEBUILD_RESOLVED_SOURCE_VERSION | cut -c 1-7)
      - IMAGE_TAG=${COMMIT_HASH:=latest}
  build:
    commands:
      - echo Build started on `date`
      - echo Building the Docker image...
      - docker build -t $REPOSITORY_URI:latest .
      - docker tag $REPOSITORY_URI:latest $REPOSITORY_URI:$IMAGE_TAG
  post_build:
    commands:
      - echo Build completed on `date`
      - docker push $REPOSITORY_URI:latest
      - docker push $REPOSITORY_URI:$IMAGE_TAG
      - aws ecs describe-task-definition --task-definition ${TASK_DEFINITION} | jq '.taskDefinition | del(.taskDefinitionArn, .status, .requiresAttributes, .compatibilities, .revision)' | jq '(.containerDefinitions[] | select(.name == "'${IMAGE_REPO_NAME}'")).image = "'${REPOSITORY_URI}:${IMAGE_TAG}'"' > /tmp/taskdef.json
      - aws ecs register-task-definition --cli-input-json file:///tmp/taskdef.json
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