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:

It required a lot of maintenance when upgrading dependencies.
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

Before you begin, log in as your funkwhale user
```
sudo -u funkwhale -H bash
```
Create a full backup of your /srv/funkwhale directory.
```
cd /srv/
sudo cp funkwhale funkwhale.bak
```
Go to the original /srv/funkwhale folder to run the migration.
```
cd /srv/funkwhale
```

Dump your Funkwhale database

Create a backup of your Funkwhale database. We will import this into the new postgres container later.
```
docker compose exec funkwhale /usr/bin/pg_dumpall -U funkwhale > db_dump.sql
```

Stop your Funkwhale instance

Stop all Funkwhale services. This ensures that no data is changed while you migrate your instance.
```
docker compose down
```

Prepare the multi-container setup

Export the Funkwhale version you want to install.
```
export FUNKWHALE_VERSION=1.4.0
```
Take a backup of your current docker-compose.yml file.
```
mv docker-compose.yml docker-compose.yml.bak
```

Download the required template files.

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

Take a backup of your current .env file.
```
mv .env .env.bak
```

Download the .env file template.

curl -L -o .env "https://dev.funkwhale.audio/funkwhale/funkwhale/raw/${FUNKWHALE_VERSION}/deploy/env.prod.sample"

Change the permissions on your .env file.
```
chmod 600 .env
```

Replace the version number in your new .env file.

sed -i "s/FUNKWHALE_VERSION=latest/FUNKWHALE_VERSION=$FUNKWHALE_VERSION/" .env

Copy the settings from your old .env file to your new .env file.
```
cat .env.bak >> .env
```

Check the file and remove any duplicated settings after copying.

Migrate your database

Start up your new database container.
```
# docker compose up -d postgres
```

Import your database dump into the new container.

# cat db_dump.sql | docker compose exec -T postgres psql -U postgres

Run the database migrations.

# docker compose run --rm api funkwhale-manage migrate

Start your Funkwhale instance

Once you have imported your database and run migrations, you can start all containers.

# docker compose up -d