node-feature-discovery/docs/reference/topology-updater-commandline-reference.md

---
title: "Topology Updater Cmdline Reference"
layout: default
sort: 5
---

# NFD-Topology-Updater Commandline Flags
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## Table of Contents
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1. TOC
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---

To quickly view available command line flags execute `nfd-topology-updater -help`.
In a docker container:

```bash
docker run {{ site.container_image }} \
nfd-topology-updater -help
```

### -h, -help

Print usage and exit.

### -version

Print version and exit.

### -config

The `-config` flag specifies the path of the nfd-topology-updater
configuration file to use.

Default: /etc/kubernetes/node-feature-discovery/nfd-topology-updater.conf

Example:

```bash
nfd-topology-updater -config=/opt/nfd/nfd-topology-updater.conf
```

### -no-publish

The `-no-publish` flag makes for a "dry-run" flag for nfd-topology-updater.
NFD-Topology-Updater runs resource hardware topology detection normally, but
[NodeResourceTopology](../usage/custom-resources.md#noderesourcetopology)
objects are not created or updated.

Default: *false*

Example:

```bash
nfd-topology-updater -no-publish
```

### -oneshot

The `-oneshot` flag causes nfd-topology-updater to exit after one pass of
resource hardware topology detection.

Default: *false*

Example:

```bash
nfd-topology-updater -oneshot -no-publish
```

### -metrics

The `-metrics` flag specifies the port on which to expose
[Prometheus](https://prometheus.io/) metrics. Setting this to 0 disables the
metrics server on nfd-topology-updater.

Default: 8081

Example:

```bash
nfd-topology-updater -metrics=12345
```

### -sleep-interval

The `-sleep-interval` specifies the interval between resource hardware
topology re-examination (and CR updates). zero means no CR updates on interval basis.

Default: 60s

Example:

```bash
nfd-topology-updater -sleep-interval=1h
```

### -watch-namespace

The `-watch-namespace` specifies the namespace to ensure that resource
hardware topology examination only happens for the pods running in the
specified namespace. Pods that are not running in the specified namespace
are not considered during resource accounting. This is particularly useful
for testing/debugging purpose. A "*" value would mean that all the pods would
be considered during the accounting process.

Default: "*"

Example:

```bash
nfd-topology-updater -watch-namespace=rte
```

### -kubelet-config-uri

The `-kubelet-config-uri` specifies the path to the Kubelet's configuration.
Note that the URi could either be a local host file or an HTTP endpoint.

Default:  `https://${NODE_ADDRESS}:10250/configz`

Example:

```bash
nfd-topology-updater -kubelet-config-uri=file:///var/lib/kubelet/config.yaml
```

### -api-auth-token-file

The `-api-auth-token-file` specifies the path to the api auth token file
which is used to retrieve Kubelet's configuration from Kubelet secure port,
only taking effect when `-kubelet-config-uri` is https.
Note that this token file must bind to a role that has the `get` capability to
`nodes/proxy` resources.

Default:  `/var/run/secrets/kubernetes.io/serviceaccount/token`

Example:

```bash
nfd-topology-updater -token-file=/var/run/secrets/kubernetes.io/serviceaccount/token
```

### -podresources-socket

The `-podresources-socket` specifies the path to the Unix socket where kubelet
exports a gRPC service to enable discovery of in-use CPUs and devices, and to
provide metadata for them.

Default:  /host-var/lib/kubelet/pod-resources/kubelet.sock

Example:

```bash
nfd-topology-updater -podresources-socket=/var/lib/kubelet/pod-resources/kubelet.sock
```

### -pods-fingerprint

Enables compute and report the pod set fingerprint in the NRT.
A pod fingerprint is a compact representation of the "node state" regarding resources.

Default: `false`

Example:

```bash
nfd-topology-updater -pods-fingerprint
```

### -kubelet-state-dir

The `-kubelet-state-dir` specifies the path to the Kubelet state directory,
where state and checkpoint files are stored.
The files are mount as read-only and cannot be change by the updater.
Enabled by default.
Passing an empty string will disable the watching.

Default:  /host-var/lib/kubelet

Example:

```bash
nfd-topology-updater -kubelet-state-dir=/var/lib/kubelet
```