How do I define multiple Azure services in a monorepo with azd when my Container App uses two images?

[mikkelh-SDU]

Hey, I have a question about structuring a monorepo with the Azure Developer CLI, especially when using Azure Container Apps.

I currently have:

• One Azure Container Apps environment
• One Container App running two containers (Kibana + Elasticsearch)
• An Event Hub that receives logs
• An Azure Function triggered by the Event Hub and forwarding logs into Elasticsearch

Planned repository structure

Logging (Project)
├── infra
│   ├── EventHub
│   └── KibanaElastic
│
├── src
│   └── LogIngestion-Function
│
└── azure.yaml

Goal
I want to be able to provision and deploy each component independently using:

azd provision <service>
azd deploy <service>

And do to that i need to specify the services in my azure.yaml, something like the following:

services:
  eventhub:
    resourceName: ${eventhub_name}
    module: EventHub

  aca:
    host: containerapp
    image: ${kibanaImage}
    module: KibanaElastic

  functionapp:
    resourceName: ${site_name}
    language: dotnet
    project: ./src/function/functionapp.csproj
    host: appservice
    resourceGroup: ${rg_name}

Issue I'm running into is my Container App actually uses two separate container images
— one for Kibana, one for Elasticsearch.
But in azure.yaml, a service using host: containerapp only allows defining a single image: property.
So I’m unsure whether I'm misunderstanding something in how azd expects multi‑container setups, or whether my service definitions need to be structured differently.

[mikkelh-SDU]

It turns out the new layered provisioning support in azd 1.19.0 actually addresses exactly what I was trying to achieve. The ability to define multiple infra layers in azure.yaml (e.g. eventhub, aca and the functionapp)

infra:
  layers:
    - name: eventhub
      path: ./infra/eventhub
    - name: aca
      path: ./infra/aca
    - name: functionapp
      path: ./infra/functionapp

services:
  functionapp:
    resourceName: ${site_name}
    language: dotnet
    project: ./src/function/functionapp.csproj
    host: appservice
    resourceGroup: ${rg_name}

One thing I’m still unsure about though:
apart from the Azure Developer CLI (azd) – October 2025 blog post, is there any official documentation for layered provisioning? I haven’t been able to find it in the main azd docs yet, and it would be great to have something more discoverable than a release blog, especially since this unlocks some fairly important scenarios.

[vhvb1989]

@weikanglim @puicchan

[puicchan]

@mikkelh-SDU, thanks for pointing it out. We are working on documenting layer provisioning. Will share the link once it's published.

[puicchan]

@mikkelh-SDU - here's the official doc: https://learn.microsoft.com/en-us/azure/developer/azure-developer-cli/layered-provisioning

[mikkelh-SDU]

Thats amazing!
Thanks for being so fast and thanks for such an amazing tool 🎉