How do I do progressive delivery for Incident response with Argo CD?

Progressive delivery is a critical aspect of incident response that enables organizations to gradually roll out changes to their systems while monitoring for issues. Using tools like Argo CD, teams can automate deployments and implement robust strategies for managing incidents effectively.

With Argo CD, you can set up progressive delivery by leveraging canary deployments, blue/green deployments, or feature flags. Here's how you can utilize Argo CD to implement a canary release strategy, where a new version of your application is deployed to a small subset of users before rolling it out to everyone. This helps in identifying issues early on without affecting all users.

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: my-app
      labels:
        app: my-app
    spec:
      replicas: 5
      selector:
        matchLabels:
          app: my-app
      template:
        metadata:
          labels:
            app: my-app
        spec:
          containers:
          - name: my-app
            image: my-repo/my-app:v2   # The new version deployed for canary
    

In the above example, we define a deployment for our application with a new version tagged as v2. Initially, this will be deployed to a small number of replicas so we can monitor its performance.