Using Kubernetes Labels in Deployment and Release Processes

Kubernetes Labels

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FAQ

What are Kubernetes labels and how are they used?

Kubernetes labels are key-value pairs used to categorize and manage resources. They help organize deployments, services, and network policies by enabling filtering and selection through label selectors.

How do I add a label to a node in Kubernetes?

To add a label to a Kubernetes node, use the following command:

kubectl label nodes <node-name> <key>=<value>

For example:

kubectl label nodes node1 environment=production

This allows you to schedule workloads on specific nodes using nodeSelector.

What is Kubernetes Deployment Node Selector and how does it work?

The nodeSelector field in a Kubernetes Deployment ensures pods are scheduled on nodes with matching labels. Example usage in a Deployment YAML file:

spec:
  nodeSelector:
    node-type: high-performance

This restricts pod scheduling to nodes with the label node-type=high-performance.

What is Kubernetes Ingress Selector and how is it used?

A Kubernetes Ingress routes external traffic to services inside the cluster based on defined rules. Example usage in an Ingress YAML definition: yaml Kopieren Bearbeiten

spec:
  rules:
    - host: example.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: my-service
                port:
                  number: 80

This routes traffic coming to example.com to the service my-service on port 80.

How do Kubernetes deployment labels help in managing workloads?

Deployment labels help organize and filter Kubernetes workloads. Example:

metadata:
  labels:
    app: my-app
    version: v1.0

These labels allow you to target specific deployments using:

kubectl get deployments -l version=v1.0

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