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Troubleshooting Docker and Kubernetes Containers

Resolving Configuration Issues

Explore how to identify and fix configuration problems in Kubernetes by validating ConfigMaps and aligning custom resources with their definitions. Learn to troubleshoot common errors related to ConfigMaps and custom resource definitions, ensuring your pods and custom applications run smoothly.

We'll cover the following...

Resolving configuration issues in Kubernetes involves validating and correcting ConfigMap definitions to ensure accurate configuration data. When addressing custom resource (CR) creation issues, it’s essential to align the CR structure with the associated custom resource definition (CRD), ensuring compatibility.

Configuration issues

Configuration management issues can occur when not properly set up in Kubernetes. We’ll discuss issues and resolve them. We’ll be using the app-config.yaml file below as our ConfigMap.

YAML
apiVersion: v1
kind: ConfigMap
metadata:
  name: app-config
data:
  app-version: "1.0"
  api-key: "YOUR_API_KEY_PLACEHOLDER"

We create our ConfigMap using the following command:

kubectl apply -f app-config.yaml

Our application that will reference the ConfigMap is seen below.

YAML
apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
spec:
  containers:
    - name: sample-container
      image: nginx
      env:
        - name: APP_VERSION
          valueFrom:
            configMapKeyRef:
              name: app-config
              key: app-version
        - name: API_KEY
          valueFrom:
            configMapKeyRef:
              name: app-config
              key: api-key
        - name: DATABASE_URL
          valueFrom:
            configMapKeyRef:
              name: app-config
              key: database-url

We create the pod ...