Best Docker and Kubernetes Training | Docker and Kubernetes Course

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• FPPT.com

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Introduction to Kubernetes Metadata

• Content
• Kubernetes objects (Pods, Deployments, Services,
  etc.) often need metadata.
• Metadata helps in organizing, selecting, and
  managing resources.
• Two key metadata types
• Labels
• Annotations

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What are Labels in Kubernetes?

• Content
• Labels are key/value pairs attached to Kubernetes
  objects.
• Used to organize and select subsets of objects.
• Common use cases
• App versioning (appnginx, versionv1)
• Environment separation (envprod, envdev)

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Use Cases of Labels

• Content
• Service discovery (Services select Pods using
  labels)
• Rollouts and updates (Label-based deployments)
• Monitoring and alerting (Group by labels in tools
  like Prometheus)
• CI/CD pipelines (Label for stages or environments)

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What are Annotations in Kubernetes?

• Content
• Annotations are also key/value pairs, but meant
  for non-identifying metadata.
• Provide additional information not used for
  selection.
• Examples
• Tooling data (e.g., last deployment time)
• Contact info for object owners
• Debug logs, URLs, or checksum data

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Differences Between Labels and Annotations
Feature Labels Annotations
Used for Selection grouping Informational purposes
Queryable? Yes (selectors) No
Size Limit Small (intended for filtering) Larger values supported
Examples appweb, envprod kubectl.kubernetes.io/last-applied-configuration
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How to Use Labels Annotations (YAML Example)

• yaml
• CopyEdit
• apiVersion v1
• kind Pod
• metadata
• name mypod
• labels
• app nginx
• env dev
• annotations
• description "This pod runs a dev version of
  nginx"
• owner "team_at_example.com"

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Best Practices

• Content
• Use standardized naming for consistency (team,
  env, version)
• Avoid storing sensitive data in annotations
• Keep labels lightweight for performance in
  selectors
• Use annotations for tools, audits, and
  documentation

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Summary

• Content
• Labels and Annotations are vital for managing
  Kubernetes objects.
• Labels help in selection and grouping.
• Annotations store extra metadata not used by
  Kubernetes directly.
• Apply them smartly to improve automation,
  monitoring, and maintainability.

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Thank You
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