documentation/Running-Mastodon/Docker-Guide.md

## Docker

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The project now includes a `Dockerfile` and a `docker-compose.yml` file (which requires at least docker-compose version `1.10.0`).

## Prerequisites

- Working basic (Linux) server with Nginx (or Apache2; not officially supported).
- Recent stable version of [Docker](https://www.docker.com/community-edition).
- Recent stable version of [Docker-compose](https://github.com/docker/compose/releases/latest).

## Setting up

Review the settings in `docker-compose.yml`. Note that it is **not default** to store the postgresql database and redis databases in a persistent storage location. If you plan on running your instance in production, you **must** uncomment the [`volumes` directive](https://github.com/tootsuite/mastodon/blob/972f6bc861affd9bc40181492833108f905a04b6/docker-compose.yml#L7-L16) in `docker-compose.yml`.

Then, you need to fill in the `.env.production` file:

    cp .env.production.sample .env.production
    nano .env.production

Do NOT change the `REDIS_*` or `DB_*` settings when running with the default docker configurations.

You will need to fill in, at least: `LOCAL_DOMAIN`, `LOCAL_HTTPS`, and the `SMTP_*` settings.


## Building the app

Before running the first time, you need to build the images:

    docker-compose build

Now the image can be used to generate secrets. Run the command below for each of `PAPERCLIP_SECRET`, `SECRET_KEY_BASE`, and `OTP_SECRET` then copy the results into the `.env.production` file:

    docker-compose run --rm web rake secret

Then you should run the `db:migrate` command to create the database, or migrate it from an older release:

    docker-compose run --rm web rake db:migrate

Then, you will also need to precompile the assets:

    docker-compose run --rm web rake assets:precompile

before you can launch the docker image with:

    docker-compose up

If you wish to run this as a daemon process instead of monitoring it on console, use instead:

    docker-compose up -d

## Configuration

Then you may login to your new Mastodon instance by browsing to http://localhost:3000/

Following that, make sure that you read the [production guide](Production-guide.md). You are probably going to want to understand how
to configure Nginx to make your Mastodon instance available to the rest of the world.

The container has two volumes, for the assets and for user uploads, and optionally two more, for the postgresql and redis databases.

The default docker-compose.yml maps them to the repository's `public/assets` and `public/system` directories, you may wish to put them somewhere else. Likewise, the PostgreSQL and Redis images have data containers that you may wish to map somewhere where you know how to find them and back them up.

**Note**: The `--rm` option for docker-compose will remove the container that is created to run a one-off command after it completes. As data is stored in volumes it is not affected by that container clean-up.

## Running tasks

Running any of these tasks via docker-compose would look like this:

    docker-compose run --rm web rake mastodon:media:clear
    
## Cronjobs

There are several tasks that should be run once a day to ensure that mastodon is running smoothly. We created a daily rake task that takes care of this. As your mastodon user run `crontab -e` and enter the following

```sh
    @daily cd /home/mastodon/live && /usr/local/bin/docker-compose run --rm web rake mastodon:daily
```

## Updating

This approach makes updating to the latest version a real breeze.

1. `git fetch` to download updates from the repository.
2. Now you need to tell git to use those updates. You have probably changed your `docker-compose.yml` file. Check with `git status`.
  - If the `docker-compose.yml` file is modified, run `git stash` to stash your changes.
3. `git checkout TAG_NAME` to use the tag code. (If you have committed changes, use `git merge TAG_NAME` instead, though this isn't likely.)
4. Only if you ran `git stash`, now run `git stash pop` to redo your changes to `docker-compose.yml`. Double check the contents of this file.
5. `docker-compose build` to compile the Docker image out of the changed source files.
6. (optional) `docker-compose run --rm web rake db:migrate` to perform database migrations. Does nothing if your database is up to date.
7. (optional) `docker-compose run --rm web rake assets:precompile` to compile new JS and CSS assets.
8. `docker-compose up -d` to re-create (restart) containers and pick up the changes.