Hey there! If you have just started with Kubernetes, you’re probably feeling a bit overwhelmed. Kubernetes is like learning to drive a car. At first, there seem to be too many things to keep track of the steering, the brakes, the gear shifts, and all those mirrors. But once you get the hang of it and know what NOT to do, it becomes second nature. So, let’s discuss the five biggest mistakes we see newcomers make and how you can avoid them.

What is Kubernetes and why does it matter?

Before diving into the common mistakes, let’s understand what Kubernetes does. Think of Kubernetes as a smart manager for your applications. Just as a manager coordinates team members and resources, Kubernetes coordinates your containerized applications and the resources they need to run properly. You can understand it from our previous blog post.

1. Not Managing Resources Properly

• Details:
  Beginners often overlook setting resource limits and requests on containers, leading to resource contention and potential cluster instability. Without proper resource management, your applications may:

  • Consume too many resources, impacting other workloads
  • Crash due to insufficient resources
  • Waste cloud infrastructure costs

• Avoidance:
  
  Set appropriate CPU and memory limits for each container using resource quotas. Regularly monitor and adjust based on actual usage:
  
  

apiVersion: v1
kind: Pod
metadata:
  name: my-first-app
spec:
  containers:
  - name: app
    image: nginx
    resources:
      requests:
        memory: "128Mi"
        cpu: "100m"
      limits:
        memory: "256Mi"
        cpu: "500m"

2. Ignoring Namespace Segmentation

• Details:
  Many newcomers run all applications in the default namespace, which can create organizational and security issues as the environment scales. Mixing development, staging, and production workloads in the same namespace can lead to:

  • Difficulty in managing access controls
  • Potential data leaks between environments
  • Inefficient resource utilization

• Avoidance:
  
  Use namespaces to separate environments (e.g., dev, staging, production) and organize applications logically. This practice also simplifies resource management and access control.
  
  

apiVersion: v1
kind: Namespace
metadata:
  name: production

3. Neglecting Security Configurations

• Details:
  Beginners often skip essential security practices, such as setting Role-Based Access Control (RBAC) and network policies, exposing clusters to vulnerabilities. Neglecting security can result in:

  • Unauthorized access to cluster resources
  • Uncontrolled inter-pod communication
  • Potential data breaches

• Avoidance:
  
  Configure RBAC to control permissions and implement network policies to manage inter-pod communication. Regularly update and audit security policies to minimize risks.
  
  

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: deny-all-traffic
spec:
  podSelector: {}
  policyTypes:
  - Ingress
  - Egress

4. Overcomplicating YAML Files

• Details:
  New users often create overly complex YAML manifests, making them hard to read, manage, and debug, which can lead to deployment errors. Overcomplicated configurations can:

  • Introduce hidden issues that are difficult to troubleshoot
  • Make it harder to understand and modify the deployment
  • Increase the chances of syntax errors during updates

• Avoidance:
  
  Start with minimal configuration and gradually add complexity. Use tools like kubectl explain and kubectl dry-run to validate configurations before applying them.
  
  

apiVersion: v1
kind: Pod
metadata:
  name: simple-app
spec:
  containers:
  - name: app
    image: nginx

5. Overlooking Persistent Storage Management

• Details:
  Beginners sometimes assume storage works the same as stateless apps and may neglect data persistence configurations, risking data loss on pod restarts. Failing to manage persistent storage can lead to:

  • Loss of important application data
  • Difficulty in migrating or scaling stateful services
  • Unpredictable application behaviour

• Avoidance:
  
  Understand Persistent Volumes (PVs) and Persistent Volume Claims (PVCs) for data storage needs. Properly configure storage classes and use volume mounts for persistent data.
  
  

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-app-storage
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

Next Steps:

Now that you have understood these common pitfalls.These are some recommended next steps:

1. Review your existing deployments for these issues
2. Implement these solutions one at a time
3. Monitor the improvements
4. Graduate to more advanced topics as you become comfortable with these.

Learning Resources

To continue your Kubernetes journey:

1. Official Kubernetes Tutorials
2. Community forums & Kubernetes Slack channels
3. Training Platforms
4. Cloud Native Computing Foundation(CNCF) projects.

This guide is part of our Kubernetes learning series. Stay tuned for more articles as we progress from basics to advanced topics. For personalized guidance on your Kubernetes journey, our team is here to help.
If you would like to know more details, discuss further, or gain a deeper understanding, feel free to connect with us.