Add details to the --initialize-secure option (#21738)

[ti-chi-bot]

This is an automated cherry-pick of #21738

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See also: https://github.com/pingcap/tidb/blob/master/docs/design/2021-09-29-secure-bootstrap.md

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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the clarity and completeness of the documentation surrounding the --initialize-secure option. The changes aim to provide users with a more detailed understanding of how this option contributes to initial root user security by leveraging auth_socket authentication, thereby restricting network access for the first connection. This ensures that users can implement more robust security configurations from the outset.

Highlights

• Documentation Update: The documentation for the --initialize-secure option has been significantly updated to provide clearer details on its functionality and security implications.
• Enhanced Security Explanation: The description now explicitly states that --initialize-secure controls the creation of a root account using auth_socket authentication, enforcing a more secure socket connection for the initial login.
• Security Best Practices Integration: A reference to the --initialize-secure option has been added to the best-practices-for-security-configuration.md guide, advising its use to restrict network access for the initial root user.

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[gemini-code-assist]

Code Review

This pull request improves the documentation for the --initialize-secure option by adding more details about its function and linking to it from the security best practices page. The changes are clear and helpful. I've suggested a minor wording improvement to enhance readability in one of the files, in line with our style guide's emphasis on clarity and simplicity.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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