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Heroku

Heroku dev center

Dynos

Dynos and the Dyno Manager

To scale horizontally (scale out), add more dynos. For example, adding more web dynos allows you to handle more concurrent HTTP requests, and therefore higher volumes of traffic. To scale vertically (scale up), use bigger dynos. The maximum amount of RAM available to your application depends on the dyno type you use. Both horizontal and vertical scale are features of the professional dynos, and are not available to free or hobby dynos.

Networking & DNS

Heroku CLI

[heroku-cli]

Deployment

[heroku-release-phase]

Можно деплоиться с гитхаба, можно деплоиться через контейнеры [docker].

Деплой с докером можно реализовать двумя путями:

деплой пресобранных контейнеров на heroku

Make sure you have a working Docker installation (eg. docker ps) and that you’re logged in to Heroku (heroku login).

Log in to Container Registry:

heroku container:login

Get sample code by cloning an Alpine-based python example:

git clone https://github.com/heroku/alpinehelloworld.git

Navigate to the app’s directory and create a Heroku app:

heroku create

Creating salty-fortress-4191... done, stack is heroku-18
https://salty-fortress-4191.herokuapp.com/ | https://git.heroku.com/salty-fortress-4191.git

Build the image and push to Container Registry:

heroku container:push web

Then release the image to your app:

heroku container:release web

Now open the app in your browser:

heroku open

более подробно обо всех нюансах

создание контейнеров с heroku.yml

The heroku.yml file is a manifest you can use to define your Heroku app. It allows you to:

Create a heroku.yml file in your application’s root directory. The following example heroku.yml specifies the Docker image to build for the app’s web process:

build:
  docker:
    web: Dockerfile
run:
  web: bundle exec puma -C config/puma.rb

In this example, both heroku.yml and Dockerfile are in the same directory. If the Dockerfile lives in a non-root directory, specify the relative path in the build.docker.web value, such as app/Dockerfile.

If you don’t include a run section, Heroku uses the CMD specified in the Dockerfile.

Commit the file to your repo:

git add heroku.yml
git commit -m "Add heroku.yml"

Set the stack of your app to container:

heroku stack:set container

Push your app to Heroku:

git push heroku master

Your application will be built, and Heroku will use the run command provided in heroku.yml instead of your Procfile.

Подроюнее про содержание heroku.yml

Local Development with Docker Compose

Example [docker-compose]. That python application depends on [postgres] and [redis], which you do not push to Heroku. Instead, use Heroku add-ons in production.

Use Heroku add-ons in production:

Using official Docker images locally and Heroku add-ons in production provides you with the best of both worlds:

When using Docker Compose for local development, there are a few tips and tricks we think can help make you more successful.

Create an .env file to avoid checking credentials into source code control By using Docker and Docker Compose, you can check your local development environment setup into source code control. To handle sensitive credentials, create a .env environment file with your credentials and reference it within your Compose YAML. Your .env should be added to your .gitignore and .dockerignore files so it is not checked into source code control or included in your [docker] image, respectively.

services:
  web:
    env_file: .env

Mount your code as a volume to avoid image rebuilds Any time you make a change to your code, you need to rebuild your Docker image (which is a manual step and can be time consuming). To solve this issue, mount your code as a volume. Now rebuilds are no longer necessary when code is changed.

services:
  web:
    volumes:
      - ./webapp:/opt/webapp

Use hostnames to connect to containers By default Compose sets up a single network for your app. When you name a service in your Compose YAML, it creates a hostname that you can then use to connect to the service.

Our services in Compose YAML:

services:
  web:
  redis:
  db:

Our connection strings:

postgres://db:5432
redis://redis:6379

Running Compose in background mode When you execute docker-compose up your project is running in the foreground, displaying the output of your services. You can shut down the services gracefully using ctrl+c.

One lesser known option is to use docker-compose up -d to start your containers in the background (i.e., detached mode); you can tear down the Compose setup using docker-compose down. You check the logs of services running in background mode using docker-compose logs.

Multi-dockerfile project structure When you have multiple services, we suggest creating a subdirectory for each Docker image in your project, with the Dockerfile stored in each respective directory:

/web/Dockerfile
/redis/Dockerfile
/db/Dockerfile
/worker/Dockerfile

We don’t recommend storing all Dockerfiles in the project home directory, since it makes distinguishing between services harder.

Run your containers as a non-root user It’s a good security practice to run your containers as a non-root user; but more importantly, containers you push to Heroku will run without root access. By testing your containers locally as a non-root user, you can ensure they will work in your Heroku production environment. Learn more in the container registry documentation.

Deployment Integrations

Деплой через гитхаб Другие интеграции смотри по ссылке

Continuous Delivery

Создание пайплайнов review app heroku-cl

Heroku CI automatically runs your app’s test suite with every push to your app’s GitHub repository, enabling you to easily review test results before merging or deploying changes to your codebase. Tests execute in a disposable environment that closely resembles your staging and production environments, which helps to ensure that results are accurate and obtained safely.

Release Phase

Больше опций и вопросов интеграции в статье Continuous Delivery

Language Support

Databases & Data Management

Monitoring & Metrics

App Performance

Аддоны, бестпрактикс, секюритити и прочее смотри в оглавлении документации

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