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Troubleshooting Docker and Kubernetes Containers

Troubleshooting Networking Issues

Explore how to troubleshoot and resolve common Kubernetes networking issues such as service discovery failures and DNS misconfigurations. Understand how to configure services correctly to ensure communication between pods and improve cluster reliability.

We'll cover the following...

Networking issues in Kubernetes can disrupt communication between Pods and services, leading to application failures. These problems can range from DNS resolution to service discovery issues. We’ll be discussing and resolving these issues below.

Service discovery issues

Issues like this happen when different services can‘t communicate with each other. To explain this issue, we’ll create a Kubernetes deployment for the front-end and back-end services. We create the front-end service using the deployment below.

YAML
# frontend-deployment.yaml

apiVersion: apps/v1

kind: Deployment

metadata:

  name: frontend

spec:

  replicas: 1

  selector:

    matchLabels:

      app: frontend

  template:

    metadata:

      labels:

        app: frontend

    spec:

      containers:

        - name: frontend

          image: nginx



---

# frontend-service.yaml

apiVersion: v1

kind: Service

metadata:

  name: frontend

spec:

  selector:

    app: frontend

  ports:

    - protocol: TCP

      port: 80

      targetPort: 80

We create the back-end service with the deployment below.

YAML
# backend-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: backend
spec:
  replicas: 1
  selector:
    matchLabels:
      app: backend
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
        - name: backend
          image: nginx
...