How to integrate Functions with containers on DigitalOcean

Navigate to the Functions section in your DigitalOcean dashboard and click Create Namespace. Enter a unique namespace name like my-container-functions and select your preferred region. Click Create Namespace to initialize the serverless environment.

Create a new function by clicking Create Function in your namespace. Select Node.js or Python runtime and name it container-handler. Write your function code to process requests from containers:

exports.main = async (args) => {
  const { payload } = args;
  // Process container data
  return { statusCode: 200, body: { result: 'processed', data: payload } };
};

Click Save and Deploy.

Go to Apps in your dashboard and click Create App. Select Docker Hub or connect your Git repository containing a Dockerfile. Configure your container to make HTTP requests to your function endpoint. Add the function URL as an environment variable: FUNCTION_URL=https://faas-region.digitalocean.com/api/v1/namespaces/your-namespace/actions/container-handler.

In your container application code, implement HTTP requests to invoke the function. For example, in Node.js:

const axios = require('axios');

const invokeFunction = async (data) => {
  const response = await axios.post(process.env.FUNCTION_URL, {
    payload: data
  });
  return response.data;
};

Ensure your container handles authentication if your function requires it.

Create a webhook endpoint in your function to receive events from external services or DigitalOcean resources. In your function code, add webhook handling:

if (args.__ow_method === 'POST' && args.__ow_path === '/webhook') {
  // Process webhook data
  const eventData = args.__ow_body;
  // Trigger container operations via API
}

Enable Web Action in your function settings to make it accessible via HTTP.

Go to API section in DigitalOcean dashboard and generate an API token. In your container environment variables, add DO_API_TOKEN=your_api_token. Modify your function invocation code to include authentication headers:

headers: {
  'Authorization': `Bearer ${process.env.DO_API_TOKEN}`,
  'Content-Type': 'application/json'
}

Use the Functions dashboard to monitor invocations, errors, and performance metrics. Test your integration by triggering container operations that should invoke functions. Check the Logs tab in both your App Platform application and Functions namespace to verify successful communication. Set up alerts for failed function invocations.