node-feature-discovery/docs/advanced/worker-configuration-reference.md

---
title: "Worker config reference"
layout: default
sort: 4
---

# Configuration file reference of nfd-worker

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## Table of contents

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***WORK IN PROGRESS.***

1. TOC
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---

See the
[sample configuration file](https://github.com/kubernetes-sigs/node-feature-discovery/blob/{{site.release}}/nfd-worker.conf.example)
for a full example configuration.

## core

The `core` section contains common configuration settings that are not specific
to any particular feature source.

### core.sleepInterval

`core.sleepInterval` specifies the interval between consecutive passes of
feature (re-)detection, and thus also the interval between node re-labeling. A
non-positive value implies infinite sleep interval, i.e. no re-detection or
re-labeling is done.

Note: Overridden by the deprecated `--sleep-interval` command line flag (if
specified).

Default: `60s`

Example:

```yaml
core:
  sleepInterval: 60s
```

### core.sources

`core.sources` specifies the list of enabled feature sources. A special value
`all` enables all feature sources.

Note: Overridden by the deprecated `--sources` command line flag (if
specified).

Default: `[all]`

Example:

```yaml
core:
  sources:
    - system
    - custom
```

### core.labelWhiteList

`core.labelWhiteList` specifies a regular expression for filtering feature
labels based on the label name. Non-matching labels are not published.

Note: The regular expression is only matches against the "basename" part of the
label, i.e. to the part of the name after '/'. The label prefix (or namespace)
is omitted.

Note: Overridden by the deprecated `--label-whitelist` command line flag (if
specified).

Default: `null`

Example:

```yaml
core:
  labelWhiteList: '^cpu-cpuid'
```

### core.noPublish

Setting `core.noPublish` to `true` disables all communication with the
nfd-master. It is effectively a "dry-run" flag: nfd-worker runs feature
detection normally, but no labeling requests are sent to nfd-master.

Note: Overridden by the `--no-publish` command line flag (if specified).

Default: `false`

Example:

```yaml
core:
  noPublish: true
```

### core.klog

The following options specify the logger configuration. Most of which can be
dynamically adjusted at run-time.

Note: The logger options can also be specified via command line flags which
take precedence over any corresponding config file options.

#### core.klog.addDirHeader

If true, adds the file directory to the header of the log messages.

Default: false

Run-time configurable: yes

#### core.klog.alsologtostderr

Log to standard error as well as files.

Default: false

Run-time configurable: yes

#### core.klog.logBacktraceAt

When logging hits line file:N, emit a stack trace.

Default: *empty*

Run-time configurable: yes

#### core.klog.logDir

If non-empty, write log files in this directory.

Default: *empty*

Run-time configurable: no

#### core.klog.logFile

If non-empty, use this log file.

Default: *empty*

Run-time configurable: no

#### core.klog.logFileMaxSize

Defines the maximum size a log file can grow to. Unit is megabytes. If the
value is 0, the maximum file size is unlimited.

Default: 1800

Run-time configurable: no

#### core.klog.logtostderr

Log to standard error instead of files

Default: true

Run-time configurable: yes

#### core.klog.skipHeaders

If true, avoid header prefixes in the log messages.

Default: false

Run-time configurable: yes

#### core.klog.skipLogHeaders

If true, avoid headers when opening log files.

Default: false

Run-time configurable: no

#### core.klog.stderrthreshold

Logs at or above this threshold go to stderr (default 2)

Run-time configurable: yes

#### core.klog.v

Number for the log level verbosity.

Default: 0

Run-time configurable: yes

#### core.klog.vmodule

Comma-separated list of `pattern=N` settings for file-filtered logging.

Default: *empty*

Run-time configurable: yes

## sources

The `sources` section contains feature source specific configuration parameters.

### sources.cpu

### sources.kernel

### soures.pci

### sources.usb

### sources.custom