New Engineer Welcome

Setting Up Your Local Dev Env


Assumes Already Have Basics

This assumes you already have looked at the general concepts for getting started.

There are many ways to run Diffgram locally. For the sake of development the ability to have the hot reload is important. In theory you can do this through docker too, but for the sake of this example I will show the "raw" way of running it without docker.

The Services Overview

The following services are required. Some tasks may not need all of these.

  1. Dispatcher.
  2. Default Service (Backend) default/
  3. Walrus Service (Backend) walrus/
  4. Frontend frontend yarn run dev

Depending on your operating system, you can run all of these scripts.

Example First Time Dev Setup

  1. Use the script to setup your env variables.
  2. Setup local dependencies, including the database
  3. Run all the services



  1. Install locally
  2. Install with docker
  3. Use a remote postgres instance

Initial Database Setup - Reference Material

This is done automatically as part of

To manually construct the initial database, or update to the latest version run

The structure of the database is defined in code through SQL Alchemy classes.
The migration and history of the database uses Alembic.

This will start with 77907aedd319_diffgram_initial_db, and migrate through all revisions to present. This is a more durable approach then simply calling the SQL Alchemy classes directly.

Default Ports - Reference Material


Defaults already set

These are the defaults in both the services and the local_dispatch.

  1. Dispatcher 8085 is the main access point
  2. Default 8080
  3. Walrus 8082
  4. Frontend 8081
  5. Postgres 5432 Set as part of database url

Local Dependencies

  1. NodeJS
  2. Python environments. Check the requirements.txt for each service. Suggest virtual env or conda
  3. Export or set PYTHON_PATH

Conda example

cd replace_with_path_to_service
conda create --name diffgram_walrus python=3
pip install -r requirements.txt

Frontend Dependencies

  1. Install
  2. Build. eg to get icons

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