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Showing content from https://render.com/docs/configure-environment-variables below:

Environment Variables and Secrets – Render Docs

You can (and should!) use environment variables to configure your Render services:

Environment variables enable you to customize a service's runtime behavior for different environments (such as development, staging, and production). They also protect you from committing secret credentials (such as API keys or database connection strings) to your application source.

In addition to setting environment variables, you can:

• Upload plaintext secret files to Render that are available from your service's file system at runtime.
• Create environment groups to share a collection of environment variables and secret files across multiple Render services.

1. In the Render Dashboard, select the service you want to add an environment variable to.

2. Click Environment in the left pane.

3. Under Environment Variables, click + Add Environment Variable.

   • You can also click Add from .env to add environment variables in bulk.

4. Provide a Key and Value for each new environment variable.

5. Save your changes. You can select one of three options from the dropdown:

   • Save, rebuild, and deploy: Render triggers a new build for your service and deploys it with the new environment variables.
   • Save and deploy: Render redeploys your service's existing build with the new environment variables.
   • Save only: Render saves the new environment variables without triggering a deploy. Your service will not use the new variables until its next deploy.

That's it! Render saves your environment variables and then kicks off a deploy (unless you selected Save only).

If you have a local .env file, you can bulk-add its environment variables to your service by clicking Add from .env on your service's Environment page.

Your file must use valid .env syntax. Here are some valid variable declarations:

KEY_1=value_of_KEY_1
KEY_2="value of KEY_2"
KEY_3="-----BEGIN-----
value
of
KEY_3
-----END-----"

If you're using Render Blueprints to represent your infrastructure as code, you can declare environment variables for a service directly in your render.yaml file.

Here are common patterns for declaring environment variables in a Blueprint:

envVars:
  - key: NODE_ENV
    value: staging 
  - key: APP_SECRET
    generateValue: true 
  - key: DB_URL
    fromDatabase: 
      name: mydb
      property: connectionString
  - key: MINIO_ROOT_PASSWORD
    fromService: 
      type: pserv
      name: minio
      envVarKey: MINIO_ROOT_PASSWORD
  - key: STRIPE_API_KEY
    sync: false 
  - fromGroup: my-env-group 

For more details and examples, see the Blueprint Specification.

You can upload secret files to Render to make those files available to your service at runtime. These are plaintext files that usually contain one or more secret credentials, such as a private key.

1. In the Render Dashboard, select the service you want to add a secret file to.

2. Click Environment in the left pane.

3. Under Secret Files, click + Add Secret File.

   • You can click the button multiple times to add multiple files.

4. Provide a Filename for the secret file.

   • At runtime, the secret file is available at /etc/secrets/<filename>.
     • For non-Docker services, the file is also available in your service's root directory.
   • To access the secret file from a Docker-based service, see Accessing secret files at runtime.

5. Click the Contents field to paste in the file's contents.

6. Click Save Changes.

That's it! Render kicks off a new deploy of your service to make the secret file available.

Environment groups are collections of environment variables and/or secret files that you can link to any number of different services. They're a helpful way to distribute configuration across a multi-service architecture using a single source of truth:

Render Workspace

DATABASE_URL
REDIS_URL

DATABASE_URL
REDIS_URL

Environment
Group

Service A

Service B

1. In the Render Dashboard, click Environment Groups in the left pane.

2. Click + New Environment Group. The following form appears:

3. Provide a helpful Group Name.

4. Provide the keys and values for any environment variables you want to add to the group.

5. Upload any secret files you want to add to the group.

6. Click Create Environment Group. The newly created group appears in the list on your Env Groups page.

After you create an environment group, you can link it to any number of different services. You can link multiple environment groups to a single service.

1. In the Render Dashboard, select the service you want to link an environment group to.

2. Click Environment in the left pane.

3. Under Linked Environment Groups, select a group from the dropdown and click Link.

That's it! Render kicks off a new deploy of your service to incorporate the values from the linked environment group.

You can modify an existing environment group from your Env Groups page in the Render Dashboard. You can add new values, replace existing values, and so on.

If you make changes to an environment group (including deleting it), Render kicks off a new deploy for every linked service that has autodeploys enabled.

You can create projects to organize your services by their application and environment (such as staging or production). You can then scope an environment group to only the services in a single project environment. If you do, you can't link the group to any service outside that environment. This helps ensure that your services use exactly the configuration you expect.

1. From your environment group's details page, click Manage > Move group:

   (This option doesn't appear if you haven't created any projects.)

2. In the dialog that appears, select a project and environment to move to.

3. Click Move env group.

After you move a group to a particular environment, it appears on the associated project's page:

Note that you still need to link the group to any applicable services in the environment.

Each programming language provides its own mechanism for reading the value of an environment variable. Below are basic examples of reading the environment variable DATABASE_URL.

const databaseUrl = process.env.DATABASE_URL

import os
database_url = os.environ.get('DATABASE_URL')

database_url = ENV['DATABASE_URL']

package main
import "os"
func main() {
	databaseURL := os.Getenv("DATABASE_URL")
}

database_url = System.get_env("DATABASE_URL")

To set environment variables in your local environment, you can use the export command in your terminal:

It can be useful to create a local .env file at the root of your local project that lists the names and values of environment variables, like so:

KEY1=value1
KEY2=value2

Many languages have a library for reading a .env file, such as dotenv for Node.js and python-dotenv for Python.

If you use a .env file, you can bulk-add its environment variables to your Render service.

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