+++
title = "fingerprint"
description = "Dump out TLS certificates."
keywords= ["fingerprint, ucp"]
[menu.main]
keywords= ["tool, reference, ucp"]

parent = "ucp_ref"
identifier="ucp_ref_fingerprint"
+++

# docker/ucp fingerprint

Dump out the TLS fingerprint for the UCP controller running on this
Docker Engine.

## Usage

```
docker run --rm \
  --name ucp \
  -v /var/run/docker.sock:/var/run/docker.sock \
  docker/ucp \
  fingerprint
```

## Description

This utility will display the certificate fingerprint of the UCP controller
running on the local engine.  This can be used when scripting 'join'
operations for the '--fingerprint' flag.