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    在 Kubernetes 中部署 Prow

    Lawrence发表于 2020-11-29 00:00:00
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    Prow | praʊ |

    noun. the pointed front part of a ship; the bow. 船首.

    了解 Prow 可以参考这篇知乎专栏:Kubernetes 原生 CI/CD 系统 Prow 简介。

    本文重点参考了以下文章,并做了一些问题的修复:

    • Prow Tutorial - KubeSphere‘s Github Repo
    • DevOps 工具链之 Prow

    我们并不一定需要使用 Bazel 来构建配置。笔者使用的 Kubernetes 版本为 2020 年发布的 1.19.3。一切的前提是拥有一个 Kubernetes 集群,最好在里面也部署一个 Ingress Controller 用来暴露我们的 WebHook 以及 Prow Deck 前端 Dashboard 服务。

    在 K8s 集群中部署 Prow 的具体步骤如下:

    首先注册一个 GitHub 账号专门用于作为机器人账号,用此账号前往 GitHub Developer 页面创建一个 Token,权限参考上文,并邀请此账号作为 Collaborators 管理仓库。

    随机生成 H-MAC 作为 WebHook 密码安全验证。

    openssl rand -hex 20 > hmac
    

    将他们保存在 /etc/github/oauth 和 /etc/webhook/hmac 文件下。路径不能错误,因为此处和下面的 Prow manifest 字段匹配。

    纳入集群对象:

    kubectl create secret generic hmac-token --from-file=hmac=/etc/webhook/hmac
    kubectl create secret generic oauth-token --from-file=oauth=/etc/github/oauth
    

    将以下 Prow 的 manifest 做简单修改,注意 Ingress 的域名,namespace 为 default:

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    apiVersion: v1
    kind: ConfigMap
    metadata:
    namespace: default
    name: plugins
    data:
    plugins.yaml: ""
    ---
    apiVersion: v1
    kind: ConfigMap
    metadata:
    namespace: default
    name: config
    data:
    config.yaml: |
    prowjob_namespace: default
    pod_namespace: test-pods
    periodics:
    - interval: 10m
    agent: kubernetes
    name: echo-test
    spec:
    containers:
    - image: alpine
    command: ["/bin/date"]
    ---
    apiVersion: apiextensions.k8s.io/v1beta1
    kind: CustomResourceDefinition
    metadata:
    name: prowjobs.prow.k8s.io
    spec:
    group: prow.k8s.io
    version: v1
    names:
    kind: ProwJob
    singular: prowjob
    plural: prowjobs
    scope: Namespaced
    validation:
    openAPIV3Schema:
    properties:
    spec:
    properties:
    max_concurrency:
    type: integer
    minimum: 0
    type:
    type: string
    enum:
    - "presubmit"
    - "postsubmit"
    - "periodic"
    - "batch"
    status:
    properties:
    state:
    type: string
    enum:
    - "triggered"
    - "pending"
    - "success"
    - "failure"
    - "aborted"
    - "error"
    anyOf:
    - not:
    properties:
    state:
    type: string
    enum:
    - "success"
    - "failure"
    - "error"
    - "aborted"
    - required:
    - completionTime
    additionalPrinterColumns:
    - name: Job
    type: string
    description: The name of the job being run.
    JSONPath: .spec.job
    - name: BuildId
    type: string
    description: The ID of the job being run.
    JSONPath: .status.build_id
    - name: Type
    type: string
    description: The type of job being run.
    JSONPath: .spec.type
    - name: Org
    type: string
    description: The org for which the job is running.
    JSONPath: .spec.refs.org
    - name: Repo
    type: string
    description: The repo for which the job is running.
    JSONPath: .spec.refs.repo
    - name: Pulls
    type: string
    description: The pulls for which the job is running.
    JSONPath: ".spec.refs.pulls[*].number"
    - name: StartTime
    type: date
    description: When the job started running.
    JSONPath: .status.startTime
    - name: CompletionTime
    type: date
    description: When the job finished running.
    JSONPath: .status.completionTime
    - name: State
    description: The state of the job.
    type: string
    JSONPath: .status.state
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    namespace: default
    name: hook
    labels:
    app: hook
    spec:
    replicas: 2
    strategy:
    type: RollingUpdate
    rollingUpdate:
    maxSurge: 1
    maxUnavailable: 1
    selector:
    matchLabels:
    app: hook
    template:
    metadata:
    labels:
    app: hook
    spec:
    serviceAccountName: "hook"
    terminationGracePeriodSeconds: 180
    containers:
    - name: hook
    image: magicsong/hook:v20190711-664ef040d
    args:
    - --dry-run=false
    - --config-path=/etc/config/config.yaml
    ports:
    - name: http
    containerPort: 8888
    volumeMounts:
    - name: hmac
    mountPath: /etc/webhook
    readOnly: true
    - name: oauth
    mountPath: /etc/github
    readOnly: true
    - name: config
    mountPath: /etc/config
    readOnly: true
    - name: plugins
    mountPath: /etc/plugins
    readOnly: true
    # livenessProbe:
    # httpGet:
    # path: /healthz
    # port: 8081
    # initialDelaySeconds: 3
    # periodSeconds: 3
    # readinessProbe:
    # httpGet:
    # path: /healthz/ready
    # port: 8081
    # initialDelaySeconds: 10
    # periodSeconds: 3
    # timeoutSeconds: 600
    volumes:
    - name: hmac
    secret:
    secretName: hmac-token
    - name: oauth
    secret:
    secretName: oauth-token
    - name: config
    configMap:
    name: config
    - name: plugins
    configMap:
    name: plugins
    ---
    apiVersion: v1
    kind: Service
    metadata:
    namespace: default
    name: hook
    spec:
    selector:
    app: hook
    ports:
    - port: 8888
    type: NodePort
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    namespace: default
    name: plank
    labels:
    app: plank
    spec:
    selector:
    matchLabels:
    app: plank
    replicas: 1 # Do not scale up.
    strategy:
    type: Recreate
    template:
    metadata:
    labels:
    app: plank
    spec:
    serviceAccountName: "plank"
    containers:
    - name: plank
    image: magicsong/plank:v20190711-664ef040d
    args:
    - --dry-run=false
    - --config-path=/etc/config/config.yaml
    volumeMounts:
    - name: oauth
    mountPath: /etc/github
    readOnly: true
    - name: config
    mountPath: /etc/config
    readOnly: true
    volumes:
    - name: oauth
    secret:
    secretName: oauth-token
    - name: config
    configMap:
    name: config
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    namespace: default
    name: sinker
    labels:
    app: sinker
    spec:
    selector:
    matchLabels:
    app: sinker
    replicas: 1
    template:
    metadata:
    labels:
    app: sinker
    spec:
    serviceAccountName: "sinker"
    containers:
    - name: sinker
    image: magicsong/sinker:v20190711-664ef040d
    args:
    - --config-path=/etc/config/config.yaml
    volumeMounts:
    - name: config
    mountPath: /etc/config
    readOnly: true
    volumes:
    - name: config
    configMap:
    name: config
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    namespace: default
    name: deck
    labels:
    app: deck
    spec:
    replicas: 2
    strategy:
    type: RollingUpdate
    rollingUpdate:
    maxSurge: 1
    maxUnavailable: 1
    selector:
    matchLabels:
    app: deck
    template:
    metadata:
    labels:
    app: deck
    spec:
    serviceAccountName: "deck"
    terminationGracePeriodSeconds: 30
    containers:
    - name: deck
    image: magicsong/deck:v20190711-664ef040d
    args:
    - --config-path=/etc/config/config.yaml
    - --tide-url=http://tide/
    - --hook-url=http://hook:8888/plugin-help
    ports:
    - name: http
    containerPort: 8080
    volumeMounts:
    - name: config
    mountPath: /etc/config
    readOnly: true
    livenessProbe:
    httpGet:
    path: /healthz
    port: 8081
    initialDelaySeconds: 3
    periodSeconds: 3
    readinessProbe:
    httpGet:
    path: /healthz/ready
    port: 8081
    initialDelaySeconds: 10
    periodSeconds: 3
    timeoutSeconds: 600
    volumes:
    - name: config
    configMap:
    name: config
    ---
    apiVersion: v1
    kind: Service
    metadata:
    namespace: default
    name: deck
    spec:
    selector:
    app: deck
    ports:
    - port: 80
    targetPort: 8080
    type: NodePort
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    namespace: default
    name: horologium
    labels:
    app: horologium
    spec:
    replicas: 1 # Do not scale up.
    strategy:
    type: Recreate
    selector:
    matchLabels:
    app: horologium
    template:
    metadata:
    labels:
    app: horologium
    spec:
    serviceAccountName: "horologium"
    terminationGracePeriodSeconds: 30
    containers:
    - name: horologium
    image: magicsong/horologium:v20190711-664ef040d
    args:
    - --config-path=/etc/config/config.yaml
    volumeMounts:
    - name: config
    mountPath: /etc/config
    readOnly: true
    volumes:
    - name: config
    configMap:
    name: config
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    namespace: default
    name: tide
    labels:
    app: tide
    spec:
    replicas: 1 # Do not scale up.
    strategy:
    type: Recreate
    selector:
    matchLabels:
    app: tide
    template:
    metadata:
    labels:
    app: tide
    spec:
    serviceAccountName: "tide"
    containers:
    - name: tide
    image: magicsong/tide:v20190711-664ef040d
    args:
    - --dry-run=false
    - --config-path=/etc/config/config.yaml
    ports:
    - name: http
    containerPort: 8888
    volumeMounts:
    - name: oauth
    mountPath: /etc/github
    readOnly: true
    - name: config
    mountPath: /etc/config
    readOnly: true
    volumes:
    - name: oauth
    secret:
    secretName: oauth-token
    - name: config
    configMap:
    name: config
    ---
    apiVersion: v1
    kind: Service
    metadata:
    namespace: default
    name: tide
    spec:
    selector:
    app: tide
    ports:
    - port: 80
    targetPort: 8888
    type: NodePort
    ---
    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
    namespace: default
    name: ing
    annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
    spec:
    rules:
    - host: prow.your-domain.com # 这里换成你的域名
    http:
    paths:
    - path: / # Correct for GKE, need / on many other distros
    backend:
    serviceName: deck
    servicePort: 80
    - path: /hook
    backend:
    serviceName: hook
    servicePort: 8888
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
    name: statusreconciler
    namespace: default
    labels:
    app: statusreconciler
    spec:
    replicas: 1
    selector:
    matchLabels:
    app: statusreconciler
    template:
    metadata:
    labels:
    app: statusreconciler
    spec:
    serviceAccountName: statusreconciler
    terminationGracePeriodSeconds: 180
    containers:
    - name: statusreconciler
    image: magicsong/status-reconciler:v20190711-664ef040d
    args:
    - --dry-run=false
    - --continue-on-error=true
    - --plugin-config=/etc/plugins/plugins.yaml
    - --config-path=/etc/config/config.yaml
    - --github-token-path=/etc/github/oauth
    volumeMounts:
    - name: oauth
    mountPath: /etc/github
    readOnly: true
    - name: config
    mountPath: /etc/config
    readOnly: true
    - name: plugins
    mountPath: /etc/plugins
    readOnly: true
    volumes:
    - name: oauth
    secret:
    secretName: oauth-token
    - name: config
    configMap:
    name: config
    - name: plugins
    configMap:
    name: plugins
    ---
    apiVersion: v1
    kind: Namespace
    metadata:
    name: test-pods
    ---
    kind: ServiceAccount
    apiVersion: v1
    metadata:
    namespace: default
    name: "deck"
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "deck"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "deck"
    subjects:
    - kind: ServiceAccount
    name: "deck"
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: test-pods
    name: "deck"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "deck"
    subjects:
    - kind: ServiceAccount
    name: "deck"
    namespace: default
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "deck"
    rules:
    - apiGroups:
    - "prow.k8s.io"
    resources:
    - prowjobs
    verbs:
    - get
    - list
    # Required when deck runs with `--rerun-creates-job=true`
    # **Warning:** Only use this for non-public deck instances, this allows
    # anyone with access to your Deck instance to create new Prowjobs
    # - create
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: test-pods
    name: "deck"
    rules:
    - apiGroups:
    - ""
    resources:
    - pods/log
    verbs:
    - get
    ---
    kind: ServiceAccount
    apiVersion: v1
    metadata:
    namespace: default
    name: "horologium"
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "horologium"
    rules:
    - apiGroups:
    - "prow.k8s.io"
    resources:
    - prowjobs
    verbs:
    - create
    - list
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "horologium"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "horologium"
    subjects:
    - kind: ServiceAccount
    name: "horologium"
    ---
    kind: ServiceAccount
    apiVersion: v1
    metadata:
    namespace: default
    name: "plank"
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "plank"
    rules:
    - apiGroups:
    - "prow.k8s.io"
    resources:
    - prowjobs
    verbs:
    - get
    - create
    - list
    - update
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: test-pods
    name: "plank"
    rules:
    - apiGroups:
    - ""
    resources:
    - pods
    verbs:
    - create
    - delete
    - list
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "plank"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "plank"
    subjects:
    - kind: ServiceAccount
    name: "plank"
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: test-pods
    name: "plank"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "plank"
    subjects:
    - kind: ServiceAccount
    name: "plank"
    namespace: default
    ---
    kind: ServiceAccount
    apiVersion: v1
    metadata:
    namespace: default
    name: "sinker"
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "sinker"
    rules:
    - apiGroups:
    - "prow.k8s.io"
    resources:
    - prowjobs
    verbs:
    - delete
    - list
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: test-pods
    name: "sinker"
    rules:
    - apiGroups:
    - ""
    resources:
    - pods
    verbs:
    - delete
    - list
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "sinker"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "sinker"
    subjects:
    - kind: ServiceAccount
    name: "sinker"
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: test-pods
    name: "sinker"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "sinker"
    subjects:
    - kind: ServiceAccount
    name: "sinker"
    namespace: default
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
    namespace: default
    name: "hook"
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "hook"
    rules:
    - apiGroups:
    - "prow.k8s.io"
    resources:
    - prowjobs
    verbs:
    - create
    - get
    - apiGroups:
    - ""
    resources:
    - configmaps
    verbs:
    - create
    - get
    - update
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "hook"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "hook"
    subjects:
    - kind: ServiceAccount
    name: "hook"
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
    namespace: default
    name: "tide"
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "tide"
    rules:
    - apiGroups:
    - "prow.k8s.io"
    resources:
    - prowjobs
    verbs:
    - create
    - list
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "tide"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "tide"
    subjects:
    - kind: ServiceAccount
    name: "tide"
    ---
    apiVersion: v1
    kind: ServiceAccount
    metadata:
    namespace: default
    name: "statusreconciler"
    ---
    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "statusreconciler"
    rules:
    - apiGroups:
    - "prow.k8s.io"
    resources:
    - prowjobs
    verbs:
    - create
    ---
    kind: RoleBinding
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
    namespace: default
    name: "statusreconciler"
    roleRef:
    apiGroup: rbac.authorization.k8s.io
    kind: Role
    name: "statusreconciler"
    subjects:
    - kind: ServiceAccount
    name: "statusreconciler"
    view raw prow.yaml hosted with ❤ by GitHub

    apply 上述 manifest。过程可能持续几分钟。上面用到的镜像都来自 DockerHub,国内可以直接访问。出现问题尝试打印 Pod 日志或者 describe,用好 Google 和 GitHub 能解决几乎 99% 的技术问题。

    curl -L https://bit.ly/prow -o prow.yaml
    vi prow.yaml
    kubectl apply -f prow.yaml
    

    Deck | dɛk |

    noun. 甲板

    等 Pod 全都 Running 后,项目就成功了一半!现在直接访问 Prow 的 Ingress 地址,可以看到 Prow 的 Deck 前端 Dashboard,类似于:https://prow.k8s.io/ 。

    这时,可以在 GitHub 的项目设置里去添加 WebHook:

    1. Payload URL 是你的 Prow Ingress 域名后面直接加 /hook
    2. Content Type 选择 application/json
    3. Secrets 是上面随机生成的 HMAC
    4. 勾选 Send me everything

    激活并保存。

    接着在集群机器上创建一个 plugins.yaml 文件和 config.yaml 文件来配置 Prow。

    插件的声明:

    plugins:
      GitHub账号/项目名:
        - size
        - cat
        - dog
        - pony
        - shrug
        - yuks
        - label
        - trigger
        - approve
        - lgtm
        - welcome
        - help
        - assign
        - branchcleaner
        - lifecycle
        - wip
        - heart
        - milestone
        - milestonestatus
        - project
        - stage
        - skip
        - blockade
    

    Tide 的配置:

    prowjob_namespace: "default"
    tide:
      merge_method:
        kubeflow/community: squash
    
      target_url: http://你的域名/tide
      queries:
        - repos:
            - GitHub账号/项目名
          labels:
            - lgtm
            - approved
          missingLabels:
            - do-not-merge
            - do-not-merge/hold
            - do-not-merge/work-in-progress
            - needs-ok-to-test
            - needs-rebase
    
      context_options:
        from-branch-protection: true
        skip-unknown-contexts: true
        orgs:
          org:
            required-contexts:
              - "check-required-for-all-repos"
            repos:
              repo:
                required-contexts:
                  - "check-required-for-all-branches"
                branches:
                  branch:
                    from-branch-protection: false
                    required-contexts:
                      - "required_test"
                    optional-contexts:
                      - "optional_test"
    

    应用更改:

    kubectl create configmap plugins \
    --from-file=plugins.yaml=/root/cluster/prow/plugins.yaml --dry-run -o yaml \
    | kubectl replace configmap plugins -f -
    
    kubectl create configmap config \
    --from-file=config.yaml=/root/cluster/prow/config.yaml --dry-run -o yaml \
    | kubectl replace configmap config -f -
    

    可能需要两分钟生效。等一切就绪后,就可以创建 Pull Request 来测试了。效果可以参考 Kubernetes 的官方仓库或我的这个 node 命令行翻译项目。

    使用 Prow

    在 GitHub 的 Issue 或 Pull Request 页面下你可以用一个简单的 /meow 命令让机器人随机发送一张 🐱 的图片。无需任何刷新,GitHub 页面会自动地更新此页面(后来发现是基于 WebSocket):

    cat-in-issue

    我们注意到, Kubernetes 维护人员会使用 /test 命令来让集群内的 Pod 执行测试并将结果告诉 GitHub,这就是 ProwJob 实现的了。

    ProwJob 主要用于 PR 流程的 CI 测试,而国内网络原因无法使用 Google 的 GCS 服务,ProwJob 中 plank 依赖的 Pod Utilities,其中定义 GCS Bucket 用于存放构建产物、日志等内容,因此,我们似乎只能自己用自定义的镜像来跑临时 CI 任务了。注意定义 presubmit 字段下的 decorate 为 false,并利用好 Prow 提供的一些环境变量。

    下面是我的一个简单的 Spring Boot 项目利用 Maven 镜像(配合阿里云的 Maven Repo)来做的 presubmits,同样在 config.yaml 中添加:

    presubmits:
      la3rence/kubernetes-springboot-demo:
        - name: spring
          decorate: false
          always_run: false
          spec:
            containers:
              - image: lawrence2018/maven:3.6-jdk-8
                command: ["/bin/sh", "-c"]
                args:
                  - |
                    mkdir -p /${REPO_NAME}
                    cd /${REPO_NAME}
                    git init
                    git remote add origin https://github.com/${REPO_OWNER}/${REPO_NAME}.git
                    git fetch origin pull/${PULL_NUMBER}/head:pr-${PULL_NUMBER}
                    git checkout pr-${PULL_NUMBER}
                    mvn test
                resources:
                  requests:
                    cpu: "2000m"
                    memory: "1536Mi"
    

    重新配置 config 后并应用更改,在 Pull Request 下评论 /test all 或者 /test spring 来触发测试。参考此 PR。

    /test 后面加 presubmits 的 name 名可触发指定的测试 Pod,all 则测试全部。测试若失败,可使用 /retest 来重新测试。

    Prow-in-Pull-Request-Test.png

    如果测试通过,可使用 /lgtm 触发 tide 让机器人合并代码(注意自己不能 /lgtm)。

    自研 Issue/PR Bot

    GitHub 大规模使用 WebSocket 来动态修改 Issue 或 PR 页面的 DOM,在视觉上非常令人享受。笔者后来也参考 Prow 用 Go 写了一个简单了 OpsBot 帮助自己的仓库做一些简单的 PR、Issue 的管理,现已开源,欢迎任何 Issue / PR!



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