Deploy Templates

Dockerfile App Deploy Template

The Dockerfile App Deploy Template for Adaptable.io makes it simple to deploy any web app, using a Dockerfile. In just a few clicks, Adaptable deploys all the cloud-based resources you need to run your full-stack app, including:

  • Building your app into Serverless Containers
  • Fully-managed Serverless Database (MongoDB, PostgreSQL, or MS SQL Server)
  • Autoscaling
  • Load Balancing
  • HTTPS (SSL/TLS)

»Using this template

For step-by-step instructions on how to deploy your existing web app with this template, check out the Deploying with a Dockerfile App Guide.

»Template settings

»Base Directory

A subdirectory within your repo to be used as the root of the app for Adaptable to build and deploy. This is typically useful if your app is part of a monorepo.

The Base Directory will be the Docker context directory that the Dockerfile will operate on, so all commands within your Dockerfile will be relative to the Base Directory.

When this is set, only this subdirectory of your repo is available while building and running your app.

Leave blank to build the root of your repo.

Default: The root of your repo

example

You have a monorepo with source code for multiple apps. The source code for the app you want to deploy is located in your repo at apps/my-app/.

In this case, Base Directory should be set to apps/my-app.

»Dockerfile Name

The path and filename of the Dockerfile to use to build your app.

The path is always from the root of your repository, regardless of the Base Directory setting and should include both the path and filename.

Default: Dockerfile in the Base Directory

example

You have a monorepo with source code for multiple apps. The source code for the app you want to deploy is located in your repo at apps/my-app/ and your Dockerfile is in the same directory and called Dockerfile.prod.

In this case, Dockerfile Name should be set to apps/my-app/Dockerfile.prod.

»Runtime Environment Variables

You can specify your own custom environment variables that will be available to your app while it is running. For more information on setting custom environment variables, see Customizing Your App Environment.

The template also automatically provides several pre-set environment variables to your app at runtime:

  • ADAPTABLE_TRUST_PROXY_DEPTH: When this variable is set, it indicates that the app is behind one or more reverse proxies. The value is an integer number of proxies that your app may trust in the X-Forwarded-For HTTP request header. If this variable is set, the X-Forwarded-Proto and X-Forwarded-Host HTTP request headers may also be trusted.

  • DATABASE_URL: This is the URL that your app should use to contact the database provisioned alongside your app. It will include the database protocol, port, and hostname, as well as the username, password, and specific database to connect to. It may also have additional query parameters containing database options. This URL can often be used directly by a library such as Sequelize. If you manually parse this URL, be aware that all special characters in each portion of the URL have been URL-encoded and should be decoded before use.
    Example: postgres://dbuser:secret@database-1.adaptable.io:1234/my-app-db?option=enabled

  • EXTERNAL_HOSTNAME: This is the externally visible host and domain name for your app.
    Example: my-app.adaptable.app

  • EXTERNAL_URL: This is the externally visible URL where your app users can contact your app. This will always begin with https://.
    Example: https://my-app.adaptable.app

  • PORT: The TCP port that your app must listen on to receive incoming network requests. Your app is required to listen on this port. See containerized app requirements for more information.

Apps that use a PostgreSQL database will also have the following environment variables set:

  • PGDATABASE: The name of the database to connect to.

  • PGHOST: The hostname of the database cluster.

  • PGPASSWORD: The password to use when connecting to the database. Note that this environment variable may contain special characters.

  • PGPORT: The TCP port number to connect to.

  • PGSSLMODE: Specifies whether to negotiate SSL/TLS with the database cluster. In Adaptable, this will always be verify-full. Adaptable-provisioned PostgreSQL databases require the use of SSL/TLS.

  • PGSSLROOTCERT: Path to a file containing SSL/TLS root certificates associated with the database cluster. In order for your PostgreSQL client to verify the database cluster's certificate, you must correctly configure your PostgreSQL client to verify using this root certificate.

  • PGUSER: The username to use when connecting to the database.

Apps that use a Microsoft SQL Server database will also have the following environment variables set:

  • MSSQL_DATABASE: The name of the database to connect to.

  • MSSQL_HOST: The hostname of the database cluster.

  • MSSQL_PASSWORD: The password to use when connecting to the database. Note that this environment variable may contain special characters.

  • MSSQL_TCP_PORT: The TCP port number to connect to.

  • MSSQL_USER: The username to use when connecting to the database.

note

Runtime environment variables are not available during your app's build process.

»Build Environment Variables

You can specify your own custom environment variables that will be available to your app during the image build process. For more information on setting custom environment variables, see Customizing Your App Environment.

note

Build environment variables are only available during the build process, not during normal app runtime.

»Resources created

When this template is used to deploy your app, it creates the following Adaptable Cloud resources:

»Serverless database

The first time your app is deployed, the template creates a fully-managed serverless database that your app can use to store its data.

This template supports MongoDB, PostgreSQL, and Microsoft SQL Server.

Connection information for the database is provided directly to your running app via the DATABASE_URL environment variable.

»Load balancer

The template creates an HTTPS load balancer that sits in front of your app. This means that your deployed app immediately supports TLS encryption and advanced protocols like HTTP/2 and HTTP/3 without having to change your app source code.

»Container image

The template automatically builds your app source code from your GitHub repo into a Kubernetes-compatible container image each time you push to your selected branch on GitHub.

»Serverless containers

After the template builds your app into a container image, it deploys that image to the Adaptable Container Service, which is a highly scalable serverless platform based on Kubernetes.

»Pre-flight checks

This template includes a set of pre-flight checks that are performed before your app is deployed. These checks help ensure your app meets certain requirements and can identify some common issues before deployment.

»Check: Template settings validated

This checks that your Adaptable app's settings object matches the structure required by the template. Normally, Adaptable checks this each time you modify your app's settings and will not allow you to save invalid settings.

If this check fails:

»Check: Dockerfile exists

This checks that your Dockerfile can be found in your repo.

If this check fails:

  • Check the Base Directory and Dockerfile Name settings.

  • If you set Dockerfile Name, ensure that it contains the complete path from the root of your repo and also includes the full filename of the Dockerfile you wish to use.

»Check: HTTP Listener on PORT

In order to run your app on the Adaptable Container Service, it must be an app that listens for HTTP requests. More specifically, it must listen on IP address 0.0.0.0 on the TCP port specified by the PORT environment variable.

This check cannot be done automatically by analyzing your app's source code, so the first time your app is deployed on Adaptable, you'll be asked to click the checkbox that confirms that your app will listen on the port specified by PORT.

If you have a different kind of app that you'd like to deploy or if you need help getting your app set up correctly, we can help! Contact Adaptable's friendly support team for more information.

»Additional app requirements

»Containerized app requirements

In order to run your app on the Adaptable Container Service, it must meet a few requirements. Most web-based apps shouldn't have trouble meeting these requirements.

  • Your app must listen for HTTP requests on 0.0.0.0 on the TCP port specified by the PORT environment variable. (Alternatively, your app can listen on a fixed port, but you will have to specify this PORT in your App's settings after the first failed deploy.)

  • Your app must be stateless. Although your app can write to local disk storage, that storage is a memory file system and will be lost when your app is scaled down or updated. Local disk storage is also not shared between multiple autoscaled instances of your app. This means your app cannot use local file-based databases, such as NeDB or SQLite.

  • Your app cannot perform background activities outside the scope of request handling. Your app's CPU allocation is set to zero when your app is not processing a network request.

  • You should not perform HTTPS/TLS in your app itself. Adaptable automatically provides HTTPS/TLS via our highly scalable load balancing tier.

  • When your app starts, it must listen for HTTP requests within 4 minutes of being started.