docker-documentation/images/docker-duckdns.md

# [linuxserver/duckdns](https://github.com/linuxserver/docker-duckdns)

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[Duckdns](https://duckdns.org/) is a free service which will point a DNS (sub domains of duckdns.org) to an IP of your choice. The service is completely free, and doesn't require reactivation or forum posts to maintain its existence.

## Supported Architectures

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/).

Simply pulling `linuxserver/duckdns` should retrieve the correct image for your arch, but you can also pull specific arch images via tags.

The architectures supported by this image are:

| Architecture | Tag |
| :----: | --- |
| x86-64 | amd64-latest |
| arm64 | arm64v8-latest |
| armhf | arm32v7-latest |


## Usage

Here are some example snippets to help you get started creating a container from this image.

### docker

```
docker create \
  --name=duckdns \
  -e PUID=1000 `#optional` \
  -e PGID=1000 `#optional` \
  -e TZ=Europe/London \
  -e SUBDOMAINS=subdomain1,subdomain2 \
  -e TOKEN=token \
  -e LOG_FILE=false `#optional` \
  -v /path/to/appdata/config:/config `#optional` \
  --restart unless-stopped \
  linuxserver/duckdns
```


### docker-compose

Compatible with docker-compose v2 schemas.

```yaml
---
version: "2.1"
services:
  duckdns:
    image: linuxserver/duckdns
    container_name: duckdns
    environment:
      - PUID=1000 #optional
      - PGID=1000 #optional
      - TZ=Europe/London
      - SUBDOMAINS=subdomain1,subdomain2
      - TOKEN=token
      - LOG_FILE=false #optional
    volumes:
    volumes:
      - /path/to/appdata/config:/config #optional
    restart: unless-stopped
```

## Parameters

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 |
| :----: | --- |


### 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 |
| `SUBDOMAINS=subdomain1,subdomain2` | multiple subdomains allowed, comma separated, no spaces |
| `TOKEN=token` | DuckDNS token |
| `LOG_FILE=false` | Set to `true` to log to file (also need to map /config). |

### Volume Mappings (`-v`)

| Volume | Function |
| :----: | --- |
| `/config` | Used in conjunction with logging to file. |



## Environment variables from files (Docker secrets)

You can set any environment variable from a file by using a special prepend `FILE__`.

As an example:

```
-e FILE__PASSWORD=/run/secrets/mysecretpassword
```

Will set the environment variable `PASSWORD` based on the contents of the `/run/secrets/mysecretpassword` file.

## Umask for running applications

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.


## 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:

```
  $ id username
    uid=1000(dockeruser) gid=1000(dockergroup) groups=1000(dockergroup)
```

## Application Setup

- Go to the [duckdns website](https://duckdns.org/), register your subdomain(s) and retrieve your token
- Create a container with your subdomain(s) and token
- It will update your IP with the DuckDNS service every 5 minutes


## Docker Mods
[![Docker Mods](https://img.shields.io/badge/dynamic/yaml?color=94398d&labelColor=555555&logoColor=ffffff&style=for-the-badge&label=mods&query=%24.mods%5B%27duckdns%27%5D.mod_count&url=https%3A%2F%2Fraw.githubusercontent.com%2Flinuxserver%2Fdocker-mods%2Fmaster%2Fmod-list.yml)](https://mods.linuxserver.io/?mod=duckdns "view available mods for this container.")

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) can be accessed via the dynamic badge above.


## Support Info

* Shell access whilst the container is running:
  * `docker exec -it duckdns /bin/bash`
* To monitor the logs of the container in realtime:
  * `docker logs -f duckdns`
* Container version number
  * `docker inspect -f '{{ index .Config.Labels "build_version" }}' duckdns`
* Image version number
  * `docker inspect -f '{{ index .Config.Labels "build_version" }}' linuxserver/duckdns`

## Versions

* **01.06.20:** - Rebasing to alpine 3.12.
* **13.04.20:** - Add donation links for DuckDNS.
* **19.12.19:** - Rebasing to alpine 3.11.
* **24.09.19:** - Fix perms on github and remove chmod that can stall the container.
* **28.06.19:** - Rebasing to alpine 3.10.
* **23.03.19:** - Switching to new Base images, shift to arm32v7 tag.
* **22.02.19:** - Rebasing to alpine 3.9.
* **08.02.19:** - Update readme with optional parameters.
* **10.12.18:** - Fix docker compose example.
* **15.10.18:** - Multi-arch image.
* **22.08.18:** - Rebase to alpine 3.8.
* **08.12.17:** - Rebase to alpine 3.7.
* **28.05.17:** - Rebase to alpine 3.6.
* **09.02.17:** - Rebase to alpine 3.5.
* **17.11.16:** - Initial release.