Maybe/docs/hosting/docker.md

# Self Hosting Maybe with Docker

This guide will help you setup, update, and maintain your self-hosted Maybe application with Docker Compose. Docker Compose is the most popular and recommended way to self-host the Maybe app.

If you want a _less
technical_ way to host the Maybe app, you can [host on Render](/docs/hosting/one-click-deploy.md) as an
_**alternative** to Docker Compose_.

## Setup Guide

Follow the guide below to get your app running.

### Step 1: Install Docker

Complete the following steps:

1. Install Docker Engine by following [the official guide](https://docs.docker.com/engine/install/)
2. Start the Docker service on your machine
3. Verify that Docker is installed correctly and is running by opening up a terminal and running the following command:

```bash
# If Docker is setup correctly, this command will succeed
docker run hello-world
```

### Step 2: Configure your Docker Compose file and environnment

#### Create a directory for your app to run

Open your terminal and create a directory where your app will run. Below is an example command with a recommended directory:

```bash
# Create a directory on your computer for Docker files
mkdir -p ~/docker-apps/maybe

# Once created, navigate your current working directory to the new folder
cd ~/docker-apps/maybe
```

#### Copy our sample Docker Compose file

Make sure you are in the directory you just created and run the following command:

```bash
# Download the sample docker-compose.yml file from the Maybe Github repository
curl -o compose.yml https://raw.githubusercontent.com/maybe-finance/maybe/main/docker-compose.example.yml
```

This command will do the following:

1. Fetch the sample docker compose file from our public Github repository
2. Creates a file in your current directory called `compose.yml` with the contents of the example file

At this point, the only file in your current working directory should be `compose.yml`.

#### Create your environment file

In order to configure the app, you will need to create a file called `.env`, which is where Docker will read environment variables from.

To do this, run the following command:

```bash
touch .env
```

#### Generate the app secret key

The app requires an environment variable called `SECRET_KEY_BASE` to run.

We will first need to generate this in the terminal. If you have `openssl` installed on your computer, you can generate it with the following command:

```bash
openssl rand -hex 64
```

_Alternatively_, you can generate a key without openssl or any external dependencies by pasting the following bash command in your terminal and running it:

```bash
head -c 64 /dev/urandom | od -An -tx1 | tr -d ' \n' && echo
```

Once you have generated a key, save it and move on to the next step.

#### Fill in your environment file

Open the file named `.env` that we created in a prior step using your favorite text editor.

Fill in this file with the following variables:

```txt
SECRET_KEY_BASE="replacemewiththegeneratedstringfromthepriorstep"
POSTGRES_PASSWORD="replacemewithyourdesireddatabasepassword"
```

### Step 3: Test your app

You are now ready to run the app. Start with the following command to make sure everything is working:

```bash
docker compose up
```

This will pull our official Docker image and start the app. You will see logs in your terminal.

Open your browser, and navigate to `http://localhost:3000`.

If everything is working, you will see the Maybe login screen.

### Step 4: Create your account

The first time you run the app, you will need to register a new account by hitting "create your account" on the login page.

1. Enter your email
2. Enter a password

### Step 5: Run the app in the background

Most self-hosting users will want the Maybe app to run in the background on their computer so they can access it at all times. To do this, hit `Ctrl+C` to stop the running process, and then run the following command:

```bash
docker compose up -d
```

The `-d` flag will run Docker Compose in "detached" mode. To verify it is running, you can run the following command:

```
docker compose ls
```

### Step 6: Enjoy!

Your app is now set up. You can visit it at `http://localhost:3000` in your browser.

If you find bugs or have a feature request, be sure to read through our [contributing guide here](https://github.com/maybe-finance/maybe/wiki/How-to-Contribute-Effectively-to-this-Project).

## How to update your app

The mechanism that updates your self-hosted Maybe app is the GHCR (Github Container Registry) Docker image that you see in the `docker-compose.yml` file:

```yml
image: ghcr.io/maybe-finance/maybe:latest
```

We recommend using one of the following images, but you can pin your app to whatever version you'd like (see [packages](https://github.com/maybe-finance/maybe/pkgs/container/maybe)):

- `ghcr.io/maybe-finance/maybe:latest` (latest commit)
- `ghcr.io/maybe-finance/maybe:stable` (latest release)

By default, your app _will
NOT_ automatically update. To update your self-hosted app, run the following commands in your terminal:

```bash
cd ~/docker-apps/maybe # Navigate to whatever directory you configured the app in
docker compose pull # This pulls the "latest" published image from GHCR
docker compose build app # This rebuilds the app with updates
docker compose up --no-deps -d app # This restarts the app using the newest version
```

## How to change which updates your app receives

If you'd like to pin the app to a specific version or tag, all you need to do is edit the `docker-compose.yml` file:

```yml
image: ghcr.io/maybe-finance/maybe:stable
```

After doing this, make sure and restart the app:

```bash
docker compose pull # This pulls the "latest" published image from GHCR
docker compose build app # This rebuilds the app with updates
docker compose up --no-deps -d app # This restarts the app using the newest version
```

## Troubleshooting

### ActiveRecord::DatabaseConnectionError

If you are trying to get Maybe started for the **first time** and run into database connection issues, it is likely because Docker has already initialized the Postgres database with a _different_ default role (usually from a previous attempt to start the app).

If you run into this issue, you can optionally **reset the database**.

**PLEASE NOTE: this will delete any existing data that you have in your Maybe database, so proceed with caution.**  For first-time users of the app just trying to get started, you're generally safe to run the commands below.

By running the commands below, you will delete your existing Maybe database and "reset" it.

```
docker compose down
docker volume rm maybe_postgres-data # this is the name of the volume the DB is mounted to
docker compose up
docker exec -it maybe-postgres-1 psql -U maybe -d maybe_production -c "SELECT 1;" # This will verify that the issue is fixed
```