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Exposing local folders as object storage with S3Proxy


The web version of TagSpaces can be used currently only with object storage as a backend. Such is offered by a countless cloud provider, starting with AWS from Amazon, Wasabi or R2 from Cloudflare. This is great if your files are located in the Cloud, but what if you want to connect your files from your NAS or other local shares, you will need local object storage server. And here comes S3Proxy in place. It is a web server, which can be used to expose local folders as S3 compatible buckets.

Running S3Proxy as Docker container

Running the S3proxy with Docker is the way we recommend, especially if you already use Docker to run the TagSpaces Web application.

sudo docker run -d \
--restart=always \
-p 9000:80 \
--name s3proxy-local-fs \
-e S3PROXY_AUTHORIZATION=aws-v2-or-v4 \
-e S3PROXY_IDENTITY="username" \
-e S3PROXY_CREDENTIAL="password" \
-e JCLOUDS_PROVIDER="filesystem" \
-v /Users/yourusername/buckets:/data \
andrewgaul/s3proxy \

Here is a short explanation of the docker command parameters. The parameter on line (2) is optional and makes Docker starting TagSpaces automatically after restart. Line (3) maps the internal port 80, specified on line (6), to port 9000 of the host computer, so TagSpaces Web can be accessed on localhost:9000 or On line (4) the name of the docker container is specified. Line (12) maps the host folder /Users/yourusername/buckets to the internal /data folder, which is the root folder of the S3Proxy server specified on line (10).


Every sub folder in the /Users/yourusername/buckets folder is served as a separate bucket by the S3Proxy service, so the name of the sub folder should be used later as bucket name in TagSpaces.

Line (5) is specifying the s3 authorization version, for TagSpaces Web and Desktop app you will need aws-v2-or-v4. On line (7) you should specify the username and on line (8) the password. Please change them according to your needs.

The local filesystem is specified as file backend on line (9). Line (11) disables the CORS restrictions, so you can access the S3 service from any host running TagSpaces. This is not always recommended and can be restricted with other parameters from the S3Proxy Dockerfile.

Line (13) specifies the name of the Docker image for the S3Proxy project, as published on Docker Hub.

Running S3Proxy as standalone program

You can start S3Proxy directly on your computer. On Linux or macOS you will need the program which can be downloaded from GitHub. You should make the s3proxy executable file with following command:

chmod +x s3proxy

And run it with the appropriate configuration file:

./s3proxy --properties s3proxy.conf

The content of the s3proxy.conf could be the following:


More details for installation and running the application on Windows can be found on the official webpage of the project.

Connecting to TagSpaces

Once the S3Proxy server is running you can connect in TagSpaces as shown in the following screenshot.

Connecting S3Proxy bucket in TagSpaces

Serving S3Proxy with SSL certificate


This is an important and recommended configuration, which is currently not covered by this tutorial. More details can be found here:

Other use cases with S3Proxy

With S3Proxy you are able to connect some other cloud storage providers which does not support S3 directly. Some examples are:

  • Azure Blob
  • Backblaze B2
  • Google Cloud Storage
  • Rackspace Cloud Files

The corresponding configuration files can be found here:

We haven't tried out all of them with TagSpaces, so any feedback will be valuable for us.