Deploy to Heroku

Deploying your application or image to Heroku

Heroku is a container-based cloud PaaS software that allows you to deploy, run, and manage your applications. Built on top of AWS, it supports Ruby, Node.js, Java, Python, Clojure, Scala, Go and PHP.

This tutorial will cover two examples, depending on your use case. If you are not using containers, your use case is covered using the Codefresh heroku-deployer plugin (Example #1). If you are using containers, you can achieve deployment by using a combination of build, push, and freestyle steps (Example #2).

The Example Django Application

You can find the example project on GitHub.

The repository contains a Django starter project with the following commands:

• pip install -r requirements.txt to install dependencies.
• python -m unittest composeexample.utils runs unit tests.
• python manage.py runserver 0.0.0.0:8000 to start the application locally.

Once launched the application presents the Django starter page at localhost:8000.

Pipeline Example #1: Deploying Source Code to Heroku Using the Codefresh Heroku Plugin

Prerequisites

• A free Codefresh account
• A free Heroku account
• A Heroku API token (you can find this under Account Settings and then scrolling down, you will find the API Key)

Create the Pipeline

This pipeline will have three stages: clone, test, and deploy.

You should be able to copy and paste this YAML in the in-line editor of the Codefresh UI. It will automatically clone the project for you.

Note that you need to change the environment variables in the deploy stage to your respective values. You can do this directly in the YAML itself, or through the Codefresh UI. Navigate to the in-line editor, and to the right you will find a tab lebeled Variables.

codefresh.yml

version: '1.0'
stages:
 - clone
 - test
 - deploy
steps:
  clone:
    title: "Cloning main repository..."
    stage: "clone"
    type: "git-clone"
    arguments:
      repo: "codefresh-contrib/heroku-python-django-sample-app"
      revision: "master"
      git: "github"
  run_unit_tests:
     title: "Running unit tests..."
     stage: "test"
     type: "freestyle"
     working_directory: "${{clone}}"
     arguments:
       image: "python:3.6-slim"
       commands:
         - "pip install -r requirements.txt --cache-dir=/codefresh/volume/pip-cache"
         - "python -m unittest composeexample.utils"
  deploy_to_heroku:
    title: "Deploying to Heroku..."
    stage: "deploy"
    type: "heroku-deployer"
    arguments:
      APP_NAME: $APP_NAME
      EMAIL: $EMAIL
      API_TOKEN: $API_TOKEN

The above pipeline does the following:

1. A git-clone step that clones the main repository
2. A freestyle step that installs dependencies and runs the unit tests
3. A freestyle step that deploys the application to Heroku using the heroku-deployer plugin from the Step Marketplace

Pipeline Example #2: Deploy a Docker Image to Heroku

This example differs from the plugin usage, as it will deploy a built Docker image to Heroku.

Note that you need to change the environment variables to your respective values. You can do this directly in the YAML itself, or through the Codefresh UI. Navigate to the in-line editor, and to the right you will find a tab lebeled Variables.

Prerequisites

• A free Codefresh account
• A free Heroku account
• An empty repository already created in Heroku using the heroku create <IMAGE_NAME> command
• A Heroku registry connected to Codefresh
• A Heroku API token (you can find this under Account Settings and then scrolling down, you will find the API Key)

Create the Pipeline

This pipeline will have five stages: clone, build, test, push, and release.

You should be able to copy and paste this YAML in the in-line editor of the Codefresh UI. It will automatically clone the project for you.

codefresh-heroku-push-image.yml

version: '1.0'
version: '1.0'
stages:
 - clone
 - build
 - test
 - push
 - release
steps:
  clone:
    title: "Cloning main repository..."
    stage: "clone"
    type: "git-clone"
    arguments:
      repo: "codefresh-contrib/heroku-python-django-sample-app"
      revision: "master"
      git: "github"
  build:
    title: "Building Docker Image..."
    stage: "build"
    type: "build"
    working_directory: "./heroku-python-django-sample-app"
    arguments: 
      image_name: "${{IMAGE_NAME}}"
      tag: "master"
      dockerfile: "Dockerfile"
  run_unit_tests:
     title: "Running unit tests..."
     stage: "test"
     type: "freestyle"
     working_directory: "./heroku-python-django-sample-app"
     arguments:
       image: '${{build}}'
       commands:
         - "python -m unittest composeexample.utils"
  push_image:
    title: "Pushing image to Heroku..."
    stage: "push"
    type: "push"
    arguments:
      candidate: '${{build}}'
      image_name: "${{IMAGE_NAME}}/web"
      registry: "heroku"
  release_image:
    title: "Releasing image..."
    stage: "release"
    type: "freestyle"
    arguments:
      image: "nazarcodefresh/heroku-cli:alpine"
      commands:
        - >-
          printf "machine api.heroku.com\n  login $EMAIL\n  password
          $API_TOKEN\nmachine git.heroku.com\n  login $EMAIL\n  password
          $API_TOKEN\n" > ~/.netrc
        - "heroku container:release --app $IMAGE_NAME web"

1. A git-clone step that clones the main repository
2. A freestyle step that builds our Docker image
3. A freestyle step that runs unit tests on our Docker image
4. A push step that pushes to the Heroku registry
5. A freestyle step that releases the Docker image

What to Read Next

• Git-clone Step
• Freestyle Step
• Push Step