juampynr / gcloud-cronjob

Docker image with gcloud and kubectl to be used on Kubernetes CronJob objects

Google Cloud CronJob

This repository defines a Dockerfile used to create a Docker image with gcloud and kubectl.

It is meant to be used in Kubernetes CronJob objects in order execute commands in a container.

Usage example

1. Create a service account at the Google Cloud Console by following the steps described at Authorizing with a service account.
2. Create a Kubernetes secret with the service account's JSON file that resulted from the above step:

kubectl create secret generic api --from-file=key=./your-service-account.json

Create the following Kubernetes object:

apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name: drupal-cron
spec:
  schedule: "*/5 * * * *"
  concurrencyPolicy: Forbid
  jobTemplate:
    spec:
      template:
        spec:
          containers:
            - name: drupal-cron
              image: juampynr/gcloud-cronjob:latest
              env:
                - name: GCLOUD_SA_KEY
                  valueFrom:
                    secretKeyRef:
                      name: api
                      key: key
              command: ["/bin/sh","-c"]
              args:
                - echo $GCLOUD_SA > gcloud_sa.json
                - gcloud auth activate-service-account --key-file=./gcloud_sa.json
                - gcloud container clusters get-credentials your-cluster-id --zone your-cluster-zone --project your-project-id
                - POD_NAME=$(kubectl get pods -l tier=frontend -o=jsonpath='{.items[0].metadata.name}')
                - kubectl exec POD_NAME -c drupal -- vendor/bin/drush core:cron
          restartPolicy: OnFailure