We welcome contributions and improvements, please see the contribution guidelines below:

Getting Setup

# Clone the Meltano repo
git clone

# Change directory into the Meltano project
cd meltano

# Optional, but it's best to have the latest pip
pip install --upgrade pip

# Optional, but it's best to have the latest setuptools
pip install --upgrade setuptools

# Optional, but it's recommended to create a virtual environment
python -m venv venv

# Activate your virtual environment
source ./venv/bin/activate

# Install all the dependencies
pip install -r requirements.txt

# Install dev dependencies with the edit flag on to detect changes
pip install -e '.[dev]'

# Run scripts to create remaining required files
make bundle

Open a new terminal tab in the meltano project directory:

# Change into the Meltano UI code directory
cd src/analyze

# Install the dependencies for Meltano UI
npm install

# Start the web server for Meltano UI 
npm run dev

Code style

Meltano uses Black and ESLint to enforce a consistent code style. You may use make lint to automatically lint all your code, or make show_lint if you only want to see what needs to change.

Merge Requests

Meltano uses an approval workflow for all merge requests.

  1. Create your merge request
  2. Assign the merge request to any Meltano maintainer for a review cycle
  3. Once the review is done the reviewer should approve the merge request
  4. Once approved, the merge request can be merged by any Meltano maintainer


Meltano uses changelog-cli to populate the


Use changelog (new|change|fix|breaks) MESSAGE to describe your current work in progress.

$ changelog new "add an amazing feature"
$ git add

Make sure to add CHANGELOG entries to your merge requests.


Meltano uses semver as its version number scheme.



Ensure you have the latest master branch locally before continuing.

  # get latest master branch
  $ git fetch origin

Release process

Meltano uses tags to create its artifacts. Pushing a new tag to the repository will publish it as docker images and a PyPI package.

  1. Meltano has a number of dependencies for the deployment toolchain that are required when performing a release. If you haven't already, please navigate to your meltano install and run the following command to install dev dependencies:
    # activate your virtualenv
    $ source ./venv/bin/activate
    # pip install all the development dependencies
    $ pip install '.[dev]'
  2. Execute the commands below:
    # create and checkout release-next branch that's based off master branch
    $ git checkout -b release-next origin/master
    # view changelog (verify changes made match changes logged)
    $ changelog view
    # after changelog validation, build the release
    $ make release
    # validate that the tag auto increments based on semver
    $ git push --tags
    # update meltano repo with release-next branch
    $ git push origin release-next
  3. Create a merge request from release-next targeting master and make sure to check delete the source branch when the changes are merged.
  4. Add the pipeline link (the one that does the actual deployment) to the merge request. Go to the commit's pipelines tab and select the one that has the publish stage.
  5. When the publish pipeline succeeds, the release is publicly available.


Tmuxinator is a way for you to efficiently manage multiple services when starting up Meltano.

Why Tmuxinator?

In order to run applications, you need to run multiple sessions and have to do a lot of repetitive tasks (like sourcing your virtual environments). So we have created a way for you to start and track everything in its appropriate panes with a single command.

  1. Start up Docker
  2. Start Meltano API
  3. Start the web app

It's a game changer for development and it's worth the effort!


  1. tmux - Recommended to install with brew
  2. tmuxinator

This config uses $MELTANO_VENV to source the virtual environment from. Set it to the correct directory before running tmuxinator.


  1. Make sure you know what directory your virtual environment is. It is normally .venv by default.
  2. Run the following commands. Keep in mind that the .venv in line 2 refers to your virtual environment directory in Step #1.
$ cd path/to/meltano
$ MELTANO_VENV=.venv tmuxinator local


Last Updated: 2/18/2019, 3:03:06 PM