Documentation Docs

Environment Variables

For convenience, we provide several ways to set your environment variables. Environment variables are useful to pass parameter to your deployed application. For instance, if you are using an external database, you will probably need its hostname, user, password, and database name. These values can be passed via environment variables and your application will be able to access them.

Dotenv (.env)

The dotenv method is used when you provide a .env file in your project root folder. The format of .env is simple and efficient, here is an exemple .env file:


This file defines 2 variables (variable1, variable2) associated to specific values.

If your application is Node.js based, you will be able to access environment variables via process.env and you will be able to retrieve variable1, variable2 via process.env.variable1 and process.env.variable2. Pretty much all programming language allows to access environment variables in a convenient manner.

Custom dotenv filepath

If you want to use a dotenv which is different than .env, you can specify a filepath:

openode set-config DOTENV_FILEPATH <path>

Example path can be for example .production.env for a specific production environment file.

Dockerfile ENV

Your Dockerfile can contain ENV commands allowing to set environment variables. To use this method, just add ENV commands in your Dockerfile, for example:

ENV variable1=value1
ENV variable2=value1

In general it's best to put non sensitive variables using this method, as typically Dockerfile files are commited to a source control tool (for example git), as opposed to .env which are normally not commited/published.

More information on ENV in Dockerfile.