description: "[Librespeed](https://github.com/librespeed/speedtest) is a very lightweight Speedtest implemented in Javascript, using XMLHttpRequest and Web Workers.
We utilise the docker manifest for multi-platform awareness. More information is available from docker [here](https://distribution.github.io/distribution/spec/manifest-v2-2/#manifest-list) and our announcement [here](https://blog.linuxserver.io/2019/02/21/the-lsio-pipeline-project/).
Simply pulling `lscr.io/linuxserver/librespeed:latest` should retrieve the correct image for your arch, but you can also pull specific arch images via tags.
Access the speedtest webui at `http://SERVERIP`. The results database can be accessed at `http://SERVERIP/results/stats.php` with the password set.
The default template used is based on `example-singleServer-full.html`. However, all templates are provided for reference at `/config/www/`. Feel free to customize `/config/www/index.html` as you like. Delete the file and restart to go back to the image default.
You can optionally place customized `speedtest.js` and `speedtest_worker.js` files under `/config/www` and they will supersede the defaults after a container start. Keep in mind that once you do so, they will no longer be updated. You can delete them and recreate the container to go back to the image defaults.
To enable a custom results page set the environment variable `CUSTOM_RESULTS=true` and start (or restart) the container at least once for `/config/www/results/index.php` to be created and modify this file to your liking.
Containers are configured using parameters passed at runtime (such as those above). These parameters are separated by a colon and indicate `<external>:<internal>` respectively. For example, `-p 8080:80` would expose port `80` from inside the container to be accessible from the host's IP on port `8080` outside the container.
For all of our images we provide the ability to override the default umask settings for services started within the containers using the optional `-e UMASK=022` setting.
Keep in mind umask is not chmod it subtracts from permissions based on it's value it does not add. Please read up [here](https://en.wikipedia.org/wiki/Umask) before asking for support.
When using volumes (`-v` flags), permissions issues can arise between the host OS and the container, we avoid this issue by allowing you to specify the user `PUID` and group `PGID`.
[](https://mods.linuxserver.io/?mod=librespeed "view available mods for this container.") [](https://mods.linuxserver.io/?mod=universal "view available universal mods.")
We publish various [Docker Mods](https://github.com/linuxserver/docker-mods) to enable additional functionality within the containers. The list of Mods available for this image (if any) as well as universal mods that can be applied to any one of our images can be accessed via the dynamic badges above.
Most of our images are static, versioned, and require an image update and container recreation to update the app inside. With some exceptions (noted in the relevant readme.md), we do not recommend or support updating apps inside the container. Please consult the [Application Setup](#application-setup) section above to see if it is recommended for the image.
Below are the instructions for updating containers:
### Via Docker Compose
* Update images:
* All images:
```bash
docker-compose pull
```
* Single image:
```bash
docker-compose pull librespeed
```
* Update containers:
* All containers:
```bash
docker-compose up -d
```
* Single container:
```bash
docker-compose up -d librespeed
```
* You can also remove the old dangling images:
```bash
docker image prune
```
### Via Docker Run
* Update the image:
```bash
docker pull lscr.io/linuxserver/librespeed:latest
```
* Stop the running container:
```bash
docker stop librespeed
```
* Delete the container:
```bash
docker rm librespeed
```
* Recreate a new container with the same docker run parameters as instructed above (if mapped correctly to a host folder, your `/config` folder and settings will be preserved)
We recommend [Diun](https://crazymax.dev/diun/) for update notifications. Other tools that automatically update containers unattended are not recommended or supported.
## Building locally
If you want to make local modifications to these images for development purposes or just to customize the logic:
