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[Calibre](https://calibre-ebook.com/) is a powerful and easy to use e-book manager. Users say it’s outstanding and a must-have. It’ll allow you to do nearly everything and it takes things a step beyond normal e-book software. It’s also completely free and open source and great for both casual users and computer experts.
Our images support multiple architectures such as `x86-64`, `arm64` and `armhf`. We utilise the docker manifest for multi-platform awareness. More information is available from docker [here](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md#manifest-list) and our announcement [here](https://blog.linuxserver.io/2019/02/21/the-lsio-pipeline-project/).
Docker images 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.
### Ports (`-p`)
| Parameter | Function |
| :----: | --- |
| `8080` | Calibre desktop gui. |
| `8081` | Calibre webserver gui. |
### Environment Variables (`-e`)
| Env | Function |
| :----: | --- |
| `PUID=1000` | for UserID - see below for explanation |
| `PGID=1000` | for GroupID - see below for explanation |
| `TZ=Europe/London` | Specify a timezone to use EG Europe/London. |
| `GUAC_USER=abc` | Username for the calibre desktop gui. |
| `GUAC_PASS=900150983cd24fb0d6963f7d28e17f72` | Password's md5 hash for the calibre desktop gui. |
### Volume Mappings (`-v`)
| Volume | Function |
| :----: | --- |
| `/config` | Where calibre should store its database and library. |
## User / Group Identifiers
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`.
Ensure any volume directories on the host are owned by the same user you specify and any permissions issues will vanish like magic.
In this instance `PUID=1000` and `PGID=1000`, to find yours use `id user` as below:
This image sets up the calibre desktop app and makes its interface available via Guacamole server in the browser. The interface is available at `http://your-ip:8080`.
By default, there is no username or password set. Custom usernames and passwords can be set via optional docker environment variables. Keep in mind that the `GUACPASS` variable accepts the `md5 hash` of the desired password (the sample above is the hash for `abc`). The md5 hash can be generated by either of the following commands:
Port 8081 is reserved for Calibre's built-in webserver, which can be enabled within the desktop app settings, and the internal port must be set to `8081` although it will then be available at the host mapped port for external access.
You can access advanced features of the Guacamole remote desktop using `ctrl`+`alt`+`shift` enabling you to use remote copy/paste and different languages.
