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Warn at startup when explicitly configured filesystem paths are unusable

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
48/100
Tipo di issue
Funzionalità
Chiarezza
Abbastanza chiara
Stato di attività
Attiva
Stack tecnologico
go
Ambito
observability

Direzione di ricerca

Start by locating startup handling for the --path.rootfs, --path.procfs, and --path.sysfs flags, then trace how explicitly configured paths are stored and accessed. Add lightweight warnings for configured paths that are missing, non-directories, or inaccessible while preserving startup, and verify that default paths and unusual environments retain their current behavior.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Containerized node_exporter deployments often depend on bind-mounted host filesystems together with flags such as:

--path.rootfs=/host
--path.procfs=/host/proc
--path.sysfs=/host/sys

A small mistake in those mounts can be harder to diagnose than it needs to be.

For example, if /host/proc is missing, mounted incorrectly, or not accessible inside the container, node_exporter can still start successfully. The problem then shows up later through collector errors, missing metrics, or values coming from the container namespace instead of the host.

That makes a simple deployment mistake look like a metrics or collector problem.

I think it would be useful to validate filesystem paths that were explicitly overridden and emit a warning at startup when one is clearly unusable.

The validation could stay intentionally lightweight:

  • path does not exist
  • path is not a directory
  • path cannot be accessed by the exporter

For procfs and sysfs, it may also be possible to cheaply detect paths that clearly do not point to the expected filesystem, as long as that doesn't introduce assumptions about files required by individual collectors.

I would keep this as a warning rather than a startup error. A partially working exporter can still be useful, and unusual environments shouldn't be rejected just because they don't look like a typical Linux host.

For example, starting with:

--path.procfs=/host/proc

when /host/proc is not actually mounted could produce a startup message along the lines of:

level=warn msg="Configured procfs path is not usable" path=/host/proc

The exporter could then continue with its current behavior.

I'd also limit the check to paths explicitly set by the user. That keeps the existing defaults untouched and makes the warning directly actionable: if someone configured a custom host path, they get an early indication that the path doesn't look usable.

The goal isn't to fully validate a host mount or predict every collector failure. It's just to catch obvious configuration mistakes at startup, before they turn into confusing scrape-time behavior.

Lingua principale
Go
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