Argo Workflows: Schedule workflows with CronWorkflow
2 min read | by Jordi Prats
With Argo workflows you can automate tasks like building and pushing Docker images on a regular schedule: You just need to use the CronWorkflow to call any WorkflowTemplate.
In this example we are going to set up an Argo CronWorkflow that runs every hour, clones a Git repository, builds a Docker image using Kaniko, and pushes it to a Docker registry.
Assuming that we already have the WorkflowTemplate that will clone, build and push, we can create a CronWorkflow that will call this template every hour:
apiVersion: argoproj.io/v1alpha1 kind: CronWorkflow metadata: name: hourly-build-and-push-image spec: schedule: "0 * * * *" concurrencyPolicy: "Allow" successfulJobsHistoryLimit: 3 failedJobsHistoryLimit: 1 workflowSpec: workflowTemplateRef: name: build-and-push-image-multistep arguments: parameters: - name: git-repo-url value: "git@github.com:jordiprats/flask-pet2cattle.git" - name: branch value: "master" - name: image-destination value: "jordiprats/ampa:kaniko" If we apply this CronWorkflow to the Kubernetes cluster, we won't see any Workflow running until the schedule is met:
$ kubectl apply -f cron.yaml cronworkflow.argoproj.io/hourly-build-and-push-image created $ kubectl get cronworkflow NAME AGE hourly-build-and-push-image 7s $ kubectl get workflow No resources found in argo namespace. As soon as the schedule is met, the CronWorkflow will trigger the WorkflowTemplate:
$ kubectl get workflow NAME STATUS AGE MESSAGE hourly-build-and-push-image-1729692000 Succeeded 84s In the status of the CronWorkflow we'll be able to check when was the last time it was triggered:
$ kubectl get cronworkflow hourly-build-and-push-image -o yaml apiVersion: argoproj.io/v1alpha1 kind: CronWorkflow metadata: (...) spec: concurrencyPolicy: Allow failedJobsHistoryLimit: 1 schedule: 0 * * * * successfulJobsHistoryLimit: 3 workflowSpec: arguments: parameters: - name: git-repo-url value: git@github.com:jordiprats/flask-pet2cattle.git - name: branch value: master - name: image-destination value: jordiprats/ampa:kaniko workflowTemplateRef: name: build-and-push-image-multistep status: lastScheduledTime: "2024-10-23T14:00:00Z" Posted on 06/11/2024