MongoDB CA_CERT environment variable not being evaluated

I have an app spec that defines a database and a service, and the service defines two environment variables, DATABASE_URL and CA_CERT, that it expects to be supplied by the database:

name: grocery-list
region: sfo

- cluster_name: my-cluster-name
  engine: MONGODB
  name: db
  production: true

- build_command: npm install && npm run build
    scope: RUN_TIME
    value: ${db.DATABASE_URL}
  - key: CA_CERT
    scope: RUN_TIME
    value: ${db.CA_CERT}
    branch: main
    deploy_on_push: true
    repo: my-org/my-repo
  http_port: 8000
  instance_count: 1
  instance_size_slug: basic-xxs
  name: backend
  - path: /api
    preserve_path_prefix: true
  run_command: npm start
  source_dir: /backend

However, when I start the app, only DATABASE_URL seems to be getting evaluated. Here’s a snippet from the Console tab of my running backend service:

apps@backend-7cfd7d7588-4xj9z:~/backend$ env


What am I doing wrong, here? Why isn’t ${db.CA_CERT} being provided as the docs say it should be?

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Bobby Iliev
Site Moderator
Site Moderator badge
December 22, 2022

Hi there,

Does it work if you try to use process.env.CA_CERT directly?

An alternative you can write the certificate to a file before your app is started.

Let’s say your run command is npm run start, replace it with the following:

echo "$CA_CERT" >
npm run start

Then, in your code, you can reference the file.

Let me know how it goes!

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