How do I achieve zero-downtime deployments for ConfigMaps?

Achieving zero-downtime deployments for ConfigMaps in Kubernetes can significantly improve the reliability and user experience of your applications. By leveraging techniques such as rolling updates, you can ensure that your application continues to serve traffic without interruption while updating configuration settings.

Zero-Downtime Deployment Strategy

To implement zero-downtime deployments with ConfigMaps, consider the following steps:

  1. Create a new version of the ConfigMap with the updated settings.
  2. Update the Deployment specification to reference the new ConfigMap.
  3. Set up your Deployment to utilize rolling updates with proper readiness and liveness probes.

The following example demonstrates how to update a ConfigMap and deploy it without downtime:

kind: ConfigMap apiVersion: v1 metadata: name: my-app-config data: KEY_1: "value1" KEY_2: "value2" --- kind: Deployment apiVersion: apps/v1 metadata: name: my-app spec: replicas: 3 selector: matchLabels: app: my-app template: metadata: labels: app: my-app spec: containers: - name: my-app-container image: my-app-image:latest env: - name: MY_CONFIG_KEY_1 valueFrom: configMapKeyRef: name: my-app-config key: KEY_1 - name: MY_CONFIG_KEY_2 valueFrom: configMapKeyRef: name: my-app-config key: KEY_2 readinessProbe: httpGet: path: /health port: 8080 initialDelaySeconds: 5 periodSeconds: 10

Keywords: zero-downtime deployments Kubernetes ConfigMap rolling updates application reliability

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