How to route traffic Azure CDN for single endpoint to multiple Storage Accounts

Suppose that, we need to create a Azure CDN on PROD with BLUE-GREEN concept. So, we should only have a custom domain but behind the sense, the static data should be stored separately on individual Strorage Account.

This will help avoid impact when we would like to update new data

In order to do this scenarios, we create 2 storages accounts name, for example: dev, test

Fist, creating a resource group using Terraform

resource "azurerm_resource_group" "rg" {
  name = "rg-courses-non-prod-weu-infra"
  location = "westeurope"
  tags = {
    Owner="courses"
  }
}

Next, create 2 storage accounts

resource "azurerm_storage_account" "st_dev" {
  name                     = "stcoursesdevweu"
  resource_group_name      = azurerm_resource_group.rg.name
  location                 = azurerm_resource_group.rg.location
  account_tier             = "Standard"
  account_replication_type = "LRS"
  min_tls_version = "TLS1_2"

  tags = {
    Owner="courses"
  }
}

resource "azurerm_storage_account" "st_test" {
  name                     = "stcoursestestweu"
  resource_group_name      = azurerm_resource_group.rg.name
  location                 = azurerm_resource_group.rg.location
  account_tier             = "Standard"
  account_replication_type = "LRS"
  min_tls_version = "TLS1_2"

  tags = {
    Owner="courses"
  }
}

Now, we are going to create Azure CDN profile, and Azure CDN profile

resource "azurerm_cdn_profile" "cdnp" {
  name                = "cdnp-courses-non-prod-weu"
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name
  sku                 = "Standard_Microsoft"

  tags = {
    Owner="courses"
  }
}

resource "azurerm_cdn_endpoint" "cdne" {
  name                = "cdne-courses-non-prod-weu"
  profile_name        = azurerm_cdn_profile.cdnp.name
  location            = azurerm_resource_group.rg.location
  resource_group_name = azurerm_resource_group.rg.name

  origin {
    name      = "origin-dev"
    host_name = azurerm_storage_account.st_dev.primary_blob_host
  }
}

Noted: currently, Terraform version 3.62.1 (latest version 26 June, 2023) haven't support creating multiple origin and origin group then we have to do this action manually.

Step 1: Select Azure CDN profile and choose the Endpoints

Select Origin in Setting section at left panel.

We will create one more origin, but in order to create more origin we have to create 2 origin groups

After we have one more origin, now we will create origin group coressponding.

We have enough 2 origins will belongs to origin groups corresponding

Finnaly, we have to create Rules engine to route traffic. For the Rules engine the Azure offer 5 rules as free. If you create more than 5 rules it will be charged

So, We will verify it

1. Create a container name matches with the value of operator. It is also change the public access level to Blob (anonymous read access for blobs only)