Document how to disable Pod antiaffinity rules

[JakeSCahill]

Description

Resolves https://redpandadata.atlassian.net/browse/DOC-1388

This pull request adds documentation explaining how to disable podAntiAffinity rules in Kubernetes deployments, specifically for cases like development environments where running multiple brokers on the same node may be desirable. It also includes a warning about the risks of disabling these rules in production.

Key documentation update:

• Added instructions and a YAML example for disabling podAntiAffinity in the statefulset configuration, along with a warning about the risks of doing so in production environments.

Page previews

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

[netlify]

✅ Deploy Preview for redpanda-docs-preview ready!

Name	Link
🔨 Latest commit	f9d73d4
🔍 Latest deploy log	https://app.netlify.com/projects/redpanda-docs-preview/deploys/6899f58a2397a400083b2f24
😎 Deploy Preview	https://deploy-preview-1303--redpanda-docs-preview.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[coderabbitai]

Important

Review skipped

Auto incremental reviews are disabled on this repository.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

📝 Walkthrough

Walkthrough

Adds documentation to the Kubernetes production deployment guide showing how to disable podAntiAffinity via a Helm values override. Introduces a YAML snippet setting podAntiAffinity: null under statefulset.podTemplate.spec.affinity, notes this enables multiple brokers on a single node, and includes a warning that it is not recommended for production due to data loss risk. No code or logic changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Assessment against linked issues

Objective	Addressed	Explanation
Document how to disable Pod anti-affinity in Redpanda Helm chart v25.1.1 (beta) using podAntiAffinity: null (DOC-1388)	✅

Suggested reviewers

• chrisseto
• Feediver1
• mmaslankaprv

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch DOC-1388

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

🪧 Tips

Chat

There are 3 ways to chat with CodeRabbit:

• Review comments: Directly reply to a review comment made by CodeRabbit. Example:
  • I pushed a fix in commit <commit_id>, please review it.
  • Explain this complex logic.
  • Open a follow-up GitHub issue for this discussion.
• Files and specific lines of code (under the "Files changed" tab): Tag @coderabbitai in a new review comment at the desired location with your query. Examples:
  • @coderabbitai explain this code block.
• PR comments: Tag @coderabbitai in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
  • @coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.
  • @coderabbitai read src/utils.ts and explain its main purpose.
  • @coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.

Support

Need help? Create a ticket on our support page for assistance with any issues or questions.

CodeRabbit Commands (Invoked using PR comments)

• @coderabbitai pause to pause the reviews on a PR.
• @coderabbitai resume to resume the paused reviews.
• @coderabbitai review to trigger an incremental review. This is useful when automatic reviews are disabled for the repository.
• @coderabbitai full review to do a full review from scratch and review all the files again.
• @coderabbitai summary to regenerate the summary of the PR.
• @coderabbitai generate docstrings to generate docstrings for this PR.
• @coderabbitai generate sequence diagram to generate a sequence diagram of the changes in this PR.
• @coderabbitai generate unit tests to generate unit tests for this PR.
• @coderabbitai resolve resolve all the CodeRabbit review comments.
• @coderabbitai configuration to show the current CodeRabbit configuration for the repository.
• @coderabbitai help to get help.

Other keywords and placeholders

• Add @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.
• Add @coderabbitai summary to generate the high-level summary at a specific location in the PR description.
• Add @coderabbitai anywhere in the PR title to generate the title automatically.

CodeRabbit Configuration File (.coderabbit.yaml)

• You can programmatically configure CodeRabbit by adding a .coderabbit.yaml file to the root of your repository.
• Please see the configuration documentation for more information.
• If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

Documentation and Community

• Visit our Documentation for detailed information on how to use CodeRabbit.
• Join our Discord Community to get help, request features, and share feedback.
• Follow us on X/Twitter for updates and announcements.

[coderabbitai]

Actionable comments posted: 2

🧹 Nitpick comments (1)

modules/deploy/pages/deployment-option/self-hosted/kubernetes/k-production-deployment.adoc (1)

637-638: Tighten the warning with an operational caveat.

Consider adding that disabling anti-affinity can also increase resource contention and reduce availability during rolling updates.

-WARNING: Disabling `podAntiAffinity` rules is not recommended for production environments as it allows multiple brokers to be scheduled on the same node, increasing the risk of data loss if a node fails.
+WARNING: Disabling `podAntiAffinity` rules is not recommended for production environments. It allows multiple brokers to be scheduled on the same node, increasing the risk of data loss if a node fails and raising the likelihood of resource contention and reduced availability during maintenance or rolling updates.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 47f1c1d and eeeda3a.

📒 Files selected for processing (1)

• modules/deploy/pages/deployment-option/self-hosted/kubernetes/k-production-deployment.adoc (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

• GitHub Check: Redirect rules - redpanda-docs-preview
• GitHub Check: Header rules - redpanda-docs-preview
• GitHub Check: Pages changed - redpanda-docs-preview

[micheleRP]

@JakeSCahill this update looks good, but 2 other warnings on this page aren't rendering properly. Can you please fix here and here?

[JakeSCahill]

@JakeSCahill this update looks good, but 2 other warnings on this page aren't rendering properly. Can you please fix here and here?

Thanks Michele. The first one is valid. It's an example warning log. I've fixed the second one.

[micheleRP]

lgtm