How do I do progressive delivery for Pod scheduling with Argo CD?

Progressive delivery is an essential approach in DevOps to facilitate safe and controlled deployment of applications. With Argo CD, a declarative, GitOps continuous delivery tool for Kubernetes, you can implement progressive delivery for pod scheduling effectively. This enables teams to roll out updates gradually and monitor performance before a full deployment, minimizing the risk of impacting users.

Here are the steps to set up progressive delivery for pod scheduling using Argo CD:

  1. Define your Kubernetes manifests in your Git repository.
  2. Create an Argo CD application linking to your repository.
  3. Implement a deployment strategy, such as canary or blue-green.
  4. Use Kubernetes features like Istio or Flagger for traffic splitting during the canary deployment.
  5. Monitor the application performance and user experience during rollout.
  6. Gradually shift traffic to the new version based on health metrics.

Here's an example of how you can define a basic canary deployment in a Kubernetes manifest managed by Argo CD:

apiVersion: apps/v1 kind: Deployment metadata: name: my-app spec: replicas: 3 selector: matchLabels: app: my-app template: metadata: labels: app: my-app spec: containers: - name: my-app image: my-app:v1 # Initial version ports: - containerPort: 80 --- apiVersion: apps/v1 kind: Deployment metadata: name: my-app-canary spec: replicas: 1 selector: matchLabels: app: my-app template: metadata: labels: app: my-app version: canary spec: containers: - name: my-app image: my-app:v2 # Updated version ports: - containerPort: 80

progressive delivery Argo CD GitOps Kubernetes canary deployment blue-green deployment DevOps

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