frbar/azure-frontdoor-bluegreen

B/G deployment with Azure Front Door

Purpose

This repository contains a Bicep template to setup:

• 2 App Service Linux (instance 0 and 1)
• Azure Front Door in front of both,
• By default traffic will hit instance 0,
• If X-Color header is specified with value green, it will hit instance 1 thanks to a route rule.

There is also a very basic API backend.

Deploy the infrastructure

$subscription = "Training Subscription"

az login
az account set --subscription $subscription

$rgName = "frbar-fd-fo"
$envName = "fbz12"
$location = "West Europe"

az group create --name $rgName --location $location
az deployment group create --resource-group $rgName --template-file infra.bicep --mode complete --parameters envName=$envName

Build and Deploy the API backend

dotnet publish .\api\ -r linux-x64 --self-contained -o publish
Compress-Archive publish\* publish.zip -Force
az webapp deployment source config-zip --src .\publish.zip -n "$($envName)-api-0" -g $rgName
az webapp deployment source config-zip --src .\publish.zip -n "$($envName)-api-1" -g $rgName

Remove-Item publish -Recurse
Remove-Item publish.zip

Get the Azure Front Door endpoint

And note it for later reference.

az afd endpoint list -g $rgName --profile-name "$($envName)-afd" --query [0].hostName

Test

Play with the X-Color header below:

$endpoint = az afd endpoint list -g $rgName --profile-name "$($envName)-afd" --query [0].hostName -otsv
$url = "https://$endpoint/api/hello-world"  

write-output "Let's ping $url"

while ($true) {  
    $response = Invoke-WebRequest -Uri $url -UseBasicParsing -Headers @{ "X-Color" = "green" }
    $firstLine = $response.Content.Split("`n")[0]  
  
    Write-Output "$(get-date -format "HH:mm:ss") $firstLine"
  
    Start-Sleep -Seconds 1  
}  

Tear down

az group delete --name $rgName