如何在通过Kubernetes运行的GKE上设置GOOGLE_APPLICATION_CREDENTIALS

时间:2017-10-30 17:57:52

标签: kubernetes google-kubernetes-engine

在kubernetes的帮助下我在GKE上运行日常工作,每天基于kubernetes中配置的cron,一个新容器旋转并尝试将一些数据插入BigQuery。

我们拥有的设置是我们在GCP中有两个不同的项目在一个项目中我们在其他项目中维护BigQuery中的数据我们都运行了所有GKE所以当GKE必须与不同的项目资源交互时我的猜测是我必须设置一个名为GOOGLE_APPLICATION_CREDENTIALS的环境变量,该变量指向服务帐户json文件,但由于每天kubernetes正在启动一个新容器,我不知道应该如何设置此变量。

提前致谢!

注意:drone-gke插件将此文件解析为golang模板。

---
apiVersion: v1
kind: Secret
metadata:
  name: my-data-service-account-credentials
type: Opaque
data:
  sa_json: "bas64JsonServiceAccount"
---
apiVersion: v1
kind: Pod
metadata:
  name: adtech-ads-apidata-el-adunit-pod
spec:
  containers:
  - name: adtech-ads-apidata-el-adunit-container
    volumeMounts:
    - name: service-account-credentials-volume
     mountPath: "/etc/gcp"
     readOnly: true
  volumes:
  - name: service-account-credentials-volume
    secret:
      secretName: my-data-service-account-credentials
      items:
      - key: sa_json
        path: sa_credentials.json

这是我们用于加载AdUnit数据的cron作业

apiVersion: batch/v2alpha1
kind: CronJob
metadata:
  name: adtech-ads-apidata-el-adunit
spec:
  schedule: "*/5 * * * *"
  suspend: false
  concurrencyPolicy: Replace
  successfulJobsHistoryLimit: 10
  failedJobsHistoryLimit: 10
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: adtech-ads-apidata-el-adunit-container
            image: {{.image}}
            args:
            - -cp
            - opt/nyt/DFPDataIngestion-1.0-jar-with-dependencies.jar
            - com.nyt.cron.AdUnitJob
            env:
              - name: ENV_APP_NAME
                value: "{{.env_app_name}}"
              - name: ENV_APP_CONTEXT_NAME
                value: "{{.env_app_context_name}}"
              - name: ENV_GOOGLE_PROJECTID
                value: "{{.env_google_projectId}}"
              - name: ENV_GOOGLE_DATASETID
                value: "{{.env_google_datasetId}}"
              - name: ENV_REPORTING_DATASETID
                value: "{{.env_reporting_datasetId}}"
              - name: ENV_ADBRIDGE_DATASETID
                value: "{{.env_adbridge_datasetId}}"
              - name: ENV_SALESFORCE_DATASETID
                value: "{{.env_salesforce_datasetId}}"
              - name: ENV_CLOUD_PLATFORM_URL
                value: "{{.env_cloud_platform_url}}"
              - name: ENV_SMTP_HOST
                value: "{{.env_smtp_host}}"
              - name: ENV_TO_EMAIL
                value: "{{.env_to_email}}"
              - name: ENV_FROM_EMAIL
                value: "{{.env_from_email}}"
              - name: ENV_AWS_USERNAME
                value: "{{.env_aws_username}}"
              - name: ENV_CLIENT_ID
                value: "{{.env_client_id}}"
              - name: ENV_REFRESH_TOKEN
                value: "{{.env_refresh_token}}"
              - name: ENV_NETWORK_CODE
                value: "{{.env_network_code}}"
              - name: ENV_APPLICATION_NAME
                value: "{{.env_application_name}}"
              - name: ENV_SALESFORCE_USERNAME
                value: "{{.env_salesforce_username}}"
              - name: ENV_SALESFORCE_URL
                value: "{{.env_salesforce_url}}"
              - name: GOOGLE_APPLICATION_CREDENTIALS
                value: "/etc/gcp/sa_credentials.json"
              - name: ENV_CLOUD_SQL_URL
                valueFrom:
                  secretKeyRef:
                    name: secrets
                    key: cloud_sql_url
              - name: ENV_AWS_PASSWORD
                valueFrom:
                  secretKeyRef:
                    name: secrets
                    key: aws_password
              - name: ENV_CLIENT_SECRET
                valueFrom:
                  secretKeyRef:
                    name: secrets
                    key: dfp_client_secret
              - name: ENV_SALESFORCE_PASSWORD
                valueFrom:
                  secretKeyRef:
                    name: secrets
                    key: salesforce_password


          restartPolicy: OnFailure

1 个答案:

答案 0 :(得分:13)

因此,如果您的GKE项目是项目my-gke,并且包含您的GKE容器需要访问的服务/事物的项目是项目my-data,则一种方法是:

  • my-data项目中创建服务帐户。如果你有一些你的roles/bigquery. dataViewer GKE容器需要阅读的BigQuery表,那么就给它任何GCP角色/权限(例如my-gke)。
  • 为这些服务帐户凭据创建Kubernetes秘密资源。它可能看起来像这样:

    apiVersion: v1
    kind: Secret
    metadata:
      name: my-data-service-account-credentials
    type: Opaque
    data:
      sa_json: <contents of running 'base64 the-downloaded-SA-credentials.json'>
    
  • 将凭据挂载到需要访问的容器中:

    [...]
    spec:
      containers:
      - name: my-container
        volumeMounts:
        - name: service-account-credentials-volume
          mountPath: /etc/gcp
          readOnly: true
    [...]
      volumes:
      - name: service-account-credentials-volume
        secret:
          secretName: my-data-service-account-credentials
          items:
          - key: sa_json
            path: sa_credentials.json
    
  • 将容器中的GOOGLE_APPLICATION_CREDENTIALS环境变量设置为指向已装入凭据的路径:

    [...]
    spec:
      containers:
      - name: my-container
        env:
        - name: GOOGLE_APPLICATION_CREDENTIALS
          value: /etc/gcp/sa_credentials.json
    

这样,任何官方GCP客户端(例如GCP Python客户端,GCP Java客户端,gcloud CLI等)都应尊重GOOGLE_APPLICATION_CREDENTIALS env var,并在发出API请求时自动使用您创建并装入凭据my-data文件的.json服务帐户。