Error #18 - Deployment Not Found error Troubleshoot and Fix

IN TODAY'S EDIT

USE CASE

Deployment Not Found error Troubleshoot and Fix

A "Deployment Not Found" error typically means that the deployment you're trying to access on your cloud platform doesn't exist, is incorrectly named, or you might not have the proper permissions to view it; we need to troubleshoot and fix this issue. And in this article, we will discuss our course of action to handle this error.

Troubleshooting Approach:

📌 Step 1: Verify the Namespace

Check if you're working in the correct namespace where the deployment is created.

kubectl get deployments --all-namespaces

If you are targeting a specific namespace, ensure it's specified:

kubectl get deployment <deployment-name> -n <namespace> 

To set a default namespace for your context:

kubectl config set-context --current --namespace=<namespace>

📌 Step 2: Check Deployment Existence

List all deployments in the current namespace to confirm if it exists:

kubectl get deployments

If it's not listed, the deployment might not be applied yet.

📌 Step 3: Verify Deployment Manifest Application

If deployment is not found, check whether the manifest has been applied successfully. Apply the deployment again if necessary:

kubectl apply -f <deployment-file>.yaml

Validate if there were any issues during deployment creation:

kubectl describe deployment <deployment-name>

📌 Step 4: Check for Typing Errors

Ensure the deployment name is spelled correctly in your commands. Check the YAML file for correct deployment name and API version.

📌 Step 5: Review Audit Logs

Check the cluster events and logs to see if the deployment was deleted.

kubectl get events --sort-by='.lastTimestamp'

Look at audit logs if enabled in your cluster.

📌 Step 6: Validate Cluster Context

Ensure you are connected to the correct cluster by checking the context:

kubectl config current-context

Switch to the right context if needed:

kubectl config use-context <cluster-context-name>

📌 Step 7: Check for RBAC Issues

If RBAC policies are misconfigured, you might not have permission to view deployments:

kubectl auth can-i get deployment <deployment-name> --namespace=<namespace> 

Ensure the correct role and bindings are applied.

📌 Step 8: Look for Deleted Resources

If the deployment existed earlier, someone might have deleted it. Check deletion logs or audit trails.

kubectl get deployment <deployment-name> --show-labels

📌 Step 9: Inspect the Cluster State

If the cluster is experiencing issues (e.g., control plane failures), it might affect resource availability.

kubectl cluster-info kubectl get nodes

📌 Step 10: Recreate the Deployment

If all else fails, recreate the deployment and verify it is deployed correctly.

Possible Causes:

1. Incorrect Namespace: The deployment exists but in a different namespace.

2. Deployment Not Applied: The manifest was not applied properly.

3. RBAC Restrictions: Lack of permissions to view deployments.

4. Cluster Context Issues: Using the wrong cluster context.

5. Resource Deletion: Deployment might have been accidentally deleted.

6. Configuration Errors: Incorrect YAML configuration or API version.

7. Kubernetes Cluster Issues: Misconfiguration or failures in the cluster.

Preventive Measures:

1. Use Namespace Best Practices:

   • Always specify the namespace explicitly in your YAML files and commands.

   • Set the default namespace in your kubeconfig to avoid mistakes.

2. Version Control:

   • Keep deployment YAMLs in version control to reapply if needed.

3. RBAC Policies:

   • Ensure proper roles and permissions are granted to avoid accidental restrictions.

4. Audit Trail Monitoring:

   • Enable Kubernetes audit logs to track changes and deletions.

5. Automation Tools:

   • Use CI/CD pipelines to ensure consistent deployment and avoid manual errors.

6. Cluster Context Awareness:

   • Use context naming conventions to identify different clusters clearly.

7. Frequent Health Checks:

   • Regularly monitor and review the deployment status using Kubernetes monitoring tools.

By following this structured approach, you can quickly diagnose and resolve the "Deployment Not Found" issue in Kubernetes. Let me know if you need more details!