Azure Functions imperative bindings

The standard input and output bindings in Azure Functions are written in a declarative pattern using the function.json. When defining input and output declarative, you do not have the option to change some of the bindings properties like the name or make multiple outputs from one input. An imperative binding can do this for you. In this blog post I’ll show how to use imperative blob bindings.

Imperative binder pattern
The imperative binder uses a pattern where you add the Binder object in the signature of your Run method. In the function you use attributes to bind the output to the binder. You can bind multiple outputs to the binder, and you are able to combine a declarative binding with the imperative binding. In this case the BlobTrigger is defined in function.json. Do not include the output binding in you function.json:

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Keep your ARM deployment secrets in the Key Vault

When creating new resource in Azure that have secrets like passwords or ssl certificates you can securely save them in the Key Vault and get them from the Key Vault when you deploy. Only the people who need access to the secrets can read and write them to the Key Vault. In a infrastructure as code scenario the secrets are supplied when deploying your templates to Azure. The code it self will be free of secrets.

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Conditional parts in ARM Templates

When creating reusable ARM templates you have a number of options on how to manage conditional parts in your templates. The smallest conditions can be done by parameters, medium differences can be done by  t-shirt sizes and large differences by linked templates. In this blog post I’ll show how to use implement conditions by linked templates.

Making conditions with linked templates
From one template in resource manager you can link to an other template. This enables you to decompose a large template into smaller more maintainable templates. The linking is done by the template type Microsoft.Resources/deployments. This template contains a property templateLink with the uri to the actual template.

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