Django 迁移通过 Kubernetes Job 和持久卷索赔

huangapple
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英文:

Django migrations by Kubernetes Job and persistent Volume Claim

问题

以下是翻译好的部分：

最佳方法是在Kubernetes上使用作业(Job)和持久卷声明(Persistent Volume Claim)来进行迁移和迁移模型的操作，用于Django部署应用程序。

持久卷声明(Persistent Volume Claim)

  1. apiVersion: v1
  2. kind: PersistentVolumeClaim
  3. metadata:
  4.   name: csi-pvc
  5. spec:
  6.   accessModes:
  7.   - ReadWriteOnce
  8.   resources:
  9.     requests:
  10.       storage: 5Gi
  11.   storageClassName: do-block-storage

作业(Job)

  1. apiVersion: batch/v1
  2. kind: Job
  3. metadata:
  4.   name: django-migrations-job
  5. spec:
  6.   template:
  7.     spec:
  8.       containers:
  9.         - name: app
  10.           image: user/app:latest
  11.           command: ["/bin/sh", "-c"]
  12.           args: ["python manage.py makemigrations app; python manage.py migrate"]
  13.           volumeMounts:
  14.             - mountPath: "/container-code-dir/app/migrations"
  15.               name: my-do-volume
  16.       volumes:
  17.         - name: my-do-volume
  18.           persistentVolumeClaim:
  19.             claimName: csi-pvc
英文:

Is the best approach to make migrations and migrate models using a Job and a Persistent Volume Claim on Kubernetes Django deployed app?

Persistent Volume

  1. apiVersion: v1
  2. kind: PersistentVolumeClaim
  3. metadata:
  4.   name: csi-pvc
  5. spec:
  6.   accessModes:
  7.   - ReadWriteOnce
  8.   resources:
  9.     requests:
  10.       storage: 5Gi
  11.   storageClassName: do-block-storage

Job

  1. apiVersion: batch/v1
  2. kind: Job
  3. metadata:
  4.   name: django-migrations-job
  5. spec:
  6.   template:
  7.     spec:
  8.       containers:
  9.         - name: app
  10.           image: user/app:latest
  11.           command: ["/bin/sh", "-c"]
  12.           args: ["python manage.py makemigrations app; python manage.py migrate"]
  13.           volumeMounts:
  14.            - mountPath: "/container-code-dir/app/migrations"
  15.              name: my-do-volume
  16.       volumes:
  17.         - name: my-do-volume
  18.           persistentVolumeClaim:
  19.            claimName: csi-pvc

答案1

得分: 3

看起来对我来说没问题。不确定你是需要每次新的 Pod 启动时运行这个作业，还是只需运行一次？

如果需要在 Django 服务 Pod 启动之前每次运行，也许你可以使用 Init Containers 来获取帮助。

示例：

  1. apiVersion: v1
  2. kind: Pod
  3. metadata:
  4.   name: myapp-pod
  5.   labels:
  6.     app: myapp
  7. spec:
  8.   containers:
  9.   - name: myapp-container
  10.     image: busybox:1.28
  11.     command: ['sh', '-c', 'echo 应用正在运行！ && sleep 3600']
  12.   initContainers:
  13.   - name: init-myservice
  14.     image: busybox:1.28
  15.     command: ['sh', '-c', 'until nslookup myservice; do echo 等待 myservice; sleep 2; done;']
  16.   - name: init-mydb
  17.     image: busybox:1.28
  18.     command: ['sh', '-c', 'until nslookup mydb; do echo 等待 mydb; sleep 2; done;']

你可以对部署（deployment）也做同样的操作。

英文:

Looks fine for me. Not sure if you need run this job once or every time, when a new pod is up?

If it is running before Django service pod started every time, maybe you can get help with Init Containers

Example:

  1. apiVersion: v1
  2. kind: Pod
  3. metadata:
  4.   name: myapp-pod
  5.   labels:
  6.     app: myapp
  7. spec:
  8.   containers:
  9.   - name: myapp-container
  10.     image: busybox:1.28
  11.     command: ['sh', '-c', 'echo The app is running! && sleep 3600']
  12.   initContainers:
  13.   - name: init-myservice
  14.     image: busybox:1.28
  15.     command: ['sh', '-c', 'until nslookup myservice; do echo waiting for myservice; sleep 2; done;']
  16.   - name: init-mydb
  17.     image: busybox:1.28
  18.     command: ['sh', '-c', 'until nslookup mydb; do echo waiting for mydb; sleep 2; done;']

you can do the same for deployment

huangapple
  • 本文由 发表于 2020年1月4日 01:50:33
  • 转载请务必保留本文链接：https://go.coder-hub.com/59583098.html
  • django
  • kubernetes
  • migration
  • persistent-volume-claims
  • persistent-volumes
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