distribution/docs/storage-drivers/gcs.md
Xueshan Feng c594eb1ff0 Mention that rootdirectory prefix has to be pre-existcreated
Like bucket, to use a prefix to separate data, the `bucketname/<prefix>` needs to be pre created, otherwise, you get 503 error when starting registry.
2018-02-22 15:40:39 -08:00

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---
description: Explains how to use the Google Cloud Storage drivers
keywords: registry, service, driver, images, storage, gcs, google, cloud
title: Google Cloud Storage driver
---
An implementation of the `storagedriver.StorageDriver` interface which uses Google Cloud for object storage.
## Parameters
<table>
<thead>
<tr>
<th>Parameter</th>
<th>Required</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<code>bucket</code>
</td>
<td>
yes
</td>
<td>
Storage bucket name.
</td>
</tr>
<tr>
<td>
<code>keyfile</code>
</td>
<td>
no
</td>
<td>
A private service account key file in JSON format. Instead of a key file <a href="https://developers.google.com/identity/protocols/application-default-credentials">Google Application Default Credentials</a> can be used.
</td>
</tr>
<tr>
<td>
<code>rootdirectory</code>
</td>
<td>
no
</td>
<td>
This is a prefix that is applied to all Google Cloud Storage keys to allow you to segment data in your bucket if necessary.
</td>
</tr>
<tr>
<td>
<code>chunksize</code>
</td>
<td>
no (default 5242880)
</td>
<td>
This is the chunk size used for uploading large blobs, must be a multiple of 256*1024.
</td>
</tr>
</tbody>
</table>
`bucket`: The name of your Google Cloud Storage bucket where you wish to store objects (needs to already be created prior to driver initialization).
`keyfile`: (optional) A private key file in JSON format, used for [Service Account Authentication](https://cloud.google.com/storage/docs/authentication#service_accounts).
**Note** Instead of a key file you can use [Google Application Default Credentials](https://developers.google.com/identity/protocols/application-default-credentials).
`rootdirectory`: (optional) The root directory tree in which all registry files are stored. Defaults to the empty string (bucket root). If a prefix is used, the path `bucketname/<prefix>` has to be pre-created before starting the registry.