# Overleaf Setup

## Getting started

1. Upload the docker-compose.yaml to the server directory.
2. Start the MongoDB alone using `docker compose up -d mongo` and wait about 15 seconds for it to start.
3. Execute the script [setup-replica-set.sh](setup-replica-set.sh) to create the ReplicaSet, required by the sharedlatex
   container
4. Now start all other containers using `docker compose up -d`

## Docker Overview

1. What does the Compose stack contain?
```
    The compose stack consists of three containers.
    The sharelatex container is the actual Overleaf application, 
    containing the frontend and the backend of the application.
    It requires two different datasources, a MongoDB and a Redis.
```

2. How to access the application?
```
    The docker-compose.yaml file in this repository is setup to 
    automatically connect to a running [Treafik](https://traefik.io) 
    instance. If a different reverse proxy is used, the traefik labels 
    can be removed and the required configuration has to be added.
```

3. Why setting up a ReplicaSet with a single MongoDB instance?
```
   The Overleaf application depends on using transactions. Transactions are 
   only supported by MongoDB if a Replica Set is active.
```

4. Where is the data stored?
```
   All relevant data from each container is bound to a Docker volume each.
```