Review Wazuh group assignment order before accepting shared configuration

Bottom line: Review the actual assignment order before accepting a shared setting. Keep adding a group, changing precedence and replacing the membership list as separate operational decisions.

Source fact: documented behavior

The Grouping agents guide says conflicting configuration from the most recently assigned group takes precedence on a multigroup agent.

Its shared-file rules replace repeated files with the last added copy and append group agent.conf content, with the last assigned group winning conflicting settings.

The documented -f operation resets the agent’s assigned groups so that only the new group remains.

What the source does not establish

This article reviews multigroup precedence and membership change scope. It does not approve a particular monitoring setting, promise a distribution time or treat a group name alone as proof that an endpoint has received the intended configuration.

Applicability questions

• What is the agent’s current ordered group membership?
• Which proposed settings or shared filenames conflict?
• Is the intended operation additive or a membership replacement?
• What endpoint evidence will confirm the resulting configuration?

DSE recommendation: controlled next steps

The following steps are DSE recommendations based on the cited source.

DSE recommends reviewing the ordered group list and the conflicting values together before changing a multigroup agent.

1. Prepare a proposed two-group case using a disposable agent and one harmless conflicting setting. Record the desired final value and both source configurations. Keep unrelated groups in the worksheet so the review exposes what a membership reset would remove. Do not make the production group assignment itself the first experiment in the change plan.
2. Inspect the assignment order using the supported group-management workflow. Compare the last assigned group’s intended setting with the candidate result, and examine any repeated shared filenames independently. If the requirement is only to add a group, reject an operation that resets all memberships. If replacement is intentional, list every membership being removed and obtain its owner’s decision first.
3. Stage the bounded change, then inspect the agent’s effective configuration through the deployment’s supported verification method. Review the received shared files separately from the manager-side membership display. If the endpoint evidence disagrees with the worksheet, investigate distribution and precedence before adding further groups or repeatedly forcing a reset to obtain a superficially tidy list.

Verification and evidence

Proposed verification: compare a harmless setting under one group, then under the reviewed two-group order. Record the actual membership order and effective value. Reversing assignment order is a separate proposed test requiring its own expected value and restoration plan; do not describe the outcome as already observed.

Include a duplicate shared-file case only when the file is safe to replace in the test environment. Preserve the original and resulting file references, the operation chosen and the endpoint observations. Close the change only for the tested membership and settings; keep disconnected agents or missing configuration evidence unresolved instead of inferring delivery from the group listing.

Official references

• Grouping agents — Wazuh; official product documentation.

Source review completed October 30, 2026. Recheck the official source and deployment-specific applicability before changing production settings.