Add first draft of AIO migration guide

changes/changelog.d/migration_guide.enhancement

@@ -0,0 +1 @@
+Created migration guide for the deprecated all-in-one docker container.

docs/administrator_documentation/migration_guide/index.md

@@ -0,0 +1,129 @@
+# Docker migration guide
+
+Funkwhale used to offer two Docker-based installation methods. The multi-container method separates each services into its own container. The mono-container method kept all services into a single container.
+
+The project deprecated the mono-container method as of Funkwhale 1.3.0. We decided not to continue supporting it for the following reasons:
+
+1. It required a lot of maintenance when upgrading dependencies.
+2. It offers no advantages over the multi-container method. Not separating the processes defeats the point of containerization.
+
+Follow this guide to migrate a mono-container installation to a multi-container setup.
+
+## Back up your Funkwhale directory
+
+1. Before you begin, log in as your `funkwhale` user
+
+   ```{code} bash
+   sudo -u funkwhale -H bash
+   ```
+
+2. Create a full backup of your `/srv/funkwhale` directory.
+
+   ```{code} bash
+   cd /srv/
+   cp funkwhale funkwhale.bak
+   ```
+
+3. Go to the original `/srv/funkwhale` folder to run the migration.
+
+   ```{code} bash
+   cd /srv/funkwhale
+   ```
+
+## Dump your Funkwhale database
+
+1. Create a backup of your Funkwhale database. We will import this into the new postgres container later.
+
+   ```{code} bash
+   docker-compose exec funkwhale /usr/bin/pg_dumpall -U funkwhale > db_dump.sql
+   ```
+
+## Stop your Funkwhale instance
+
+1. Stop all Funkwhale services. This ensures that no data is changed while you migrate your instance.
+
+   ```{code} bash
+   docker-compose down
+   ```
+
+## Prepare the multi-container setup
+
+1. Export the Funkwhale version you want to install.
+
+   ```{parsed-literal}
+   export FUNKWHALE_VERSION={sub-ref}`version`
+   ```
+
+2. Download the required template files.
+
+   ```{code} bash
+   curl -L -o docker-compose.yml "https://dev.funkwhale.audio/funkwhale/funkwhale/raw/${FUNKWHALE_VERSION}/deploy/docker-compose.yml"
+   curl -L -o nginx/funkwhale.template "https://dev.funkwhale.audio/funkwhale/funkwhale/raw/${FUNKWHALE_VERSION}/deploy/docker.nginx.template"
+   curl -L -o nginx/funkwhale_proxy.conf "https://dev.funkwhale.audio/funkwhale/funkwhale/raw/${FUNKWHALE_VERSION}/deploy/docker.funkwhale_proxy.conf"
+   ```
+
+## Update your instance env file
+
+1. Take a backup of your current `.env` file.
+
+   ```{code} bash
+   mv .env .env.bak
+   ```
+
+2. Download the `.env` file template.
+
+   ```{code} bash
+   curl -L -o .env "https://dev.funkwhale.audio/funkwhale/funkwhale/raw/${FUNKWHALE_VERSION}/deploy/env.prod.sample"
+   ```
+
+3. Change the permissions on your `.env` file.
+
+   ```{code} bash
+   chmod 600 .env
+   ```
+
+4. Replace the version number in your new `.env` file.
+
+   ```{code} bash
+   sed -i "s/FUNKWHALE_VERSION=latest/FUNKWHALE_VERSION=$FUNKWHALE_VERSION/" .env
+   ```
+
+5. Copy the settings from your old `.env` file to your new `.env` file. These will be added to the bottom of the file. Check the file and remove any duplicated settings after copying.
+
+   ```{code} bash
+   cat .env.bak >> .env
+   ```
+
+6. Update the database URL in your new `.env` file.
+
+   ```{code} bash
+   echo "DATABASE_URL=postgresql://funkwhale@postgres:5432/funkwhale" >> .env
+   ```
+
+## Migrate your database
+
+1. Start up your new database container.
+
+   ```{code} bash
+   docker-compose up -d postgres
+   ```
+
+2. Import your database dump into the new container.
+
+   ```{code} bash
+   cat db_dump.sql | docker-compose exec -T postgres psql -U postgres
+   ```
+
+3. Run the database migrations.
+
+   ```{code} bash
+   docker-compose run --rm api python manage.py migrate
+   ```
+
+## Start your Funkwhale instance
+
+Once you have imported your database and run migrations, you can start all containers.
+
+   ```{code} bash
+   docker-compose up -d
+   ```

docs/index.md

@@ -35,6 +35,7 @@ hidden: true
 
 administrator_documentation/index
 administrator_documentation/installation_docs/index
+administrator_documentation/migration_guide/index
 
 ```