Change timer interval in Azure for Azure Function published from Visual Studio

Question

I have a function app with the following code

public static void Run([TimerTrigger("*/5 * * * * *")]TimerInfo myTimer, TraceWriter log)

This executes my function every 5 seconds. In production I want the interval to be 30 seconds. After I publish the function to Azure it works and is run every 5 seconds.

On the top of the Integrate -page in the Function settings there is a message "Your app is currently in read-only mode because you have published a generated function.json. Changes made to function.json will not be honored by the Functions runtime" and the page is greyed out.

So how do I have different schedule for my timer function in development and production?

Answer 1

Make your schedule configurable. Declare it like this in code:

[TimerTrigger("%schedule%")]

Then add the development setting named schedule with value */5 * * * * * and production setting with value */30 * * * * *.

Answer 2

This should sum up the other answers given here:

Configure local settings

• add a local.settings.json file to your project.
• insert the following code:

{
  "Values": { 
    "AzureWebJobsStorage": "DefaultEndpointsProtocol=https;AccountName=XXXXXXXXXX;AccountKey=XXXXXXXXXX", 
    "AzureWebJobsDashboard": "DefaultEndpointsProtocol=https;AccountName=XXXXXXXXXX;AccountKey=XXXXXXXXXX", 
    "schedule": "*/5 * * * * *",
    "//": "put additional settings in here"
  },
  "Host": {
    "LocalHttpPort": 7071,
    "CORS": "*"
  },
  "ConnectionStrings": {
    "SQLConnectionString": "XXXXXXXXXX"
  }
}

• set the trigger attribute like

[TimerTrigger("%schedule%")]

Configure Azure

• go to the Azure Portal and go to functions, click on your function and select Application settings
• in the application setting select Add new setting
• enter schedule as key and */30 * * * * * as value
• click save on the top left
• redeploy your function