Example for Azure Application Gateway with Virtual Machine

How to set up

You need one Azure subscription you can fully manage.
And you need to get credentials after setting up system accounts for provisioning as described below.

How to set up your Azure service principal

You should create an Azure service principal that added follows roles.

• Contributor

How to set up your local environment

You need create the .env file as follows.

CURRENT_ENV_NAME=production
PROJECT_UNIQUE_ID=YOUR_UNIQUE_ID_AS_A_RESOURCE_PREFIX
AZURE_DEFAULT_LOCATION="Central US"
ARM_SUBSCRIPTION_ID=********
ARM_CLIENT_ID=********
ARM_CLIENT_SECRET=********
ARM_TENANT_ID=********

echo TF_VAR_allowed_ipaddr_list='["'$(curl -sL ifconfig.io)'/32"]' >> .env

If you are using Linux, you should add UID and GID to the .env file as follows.

test $(uname -s) = 'Linux' && echo "UID=$(id -u)\nGID=$(id -g)" >> .env

How to run

Now you can make provisioning as follows.

docker compose up --detach && docker compose logs --follow
^c

docker compose exec provisioning terraform plan
docker compose exec provisioning terraform fmt -recursive
docker compose exec provisioning terraform apply -auto-approve

How to Verify the Environment you created

via Application Gateway

"Host" request header	HTTP Status Code	"X-ServerName" response header
--	404	--
blue.example.com	200	blue.example.com
green.example.com	200	green.example.com

❯ curl -sI $AppGwPubIp | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 404 Not Found
Server: Microsoft-Azure-Application-Gateway/v2

❯ curl -sI $AppGwPubIp -H 'Host: blue.example.com' | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)
X-ServerName: blue.example.com

❯ curl -sI $AppGwPubIp -H 'Host: green.example.com' | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)
X-ServerName: green.example.com

via VM Blue

"Host" request header	HTTP Status Code	"X-ServerName" response header
--	200	--
blue.example.com	200	blue.example.com
green.example.com	200	--

❯ curl -sI $VMBluePubIp | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)

❯ curl -sI $VMBluePubIp -H 'Host: blue.example.com' | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)
X-ServerName: blue.example.com

❯ curl -sI $VMBluePubIp -H 'Host: green.example.com' | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)

via VM Green

"Host" request header	HTTP Status Code	"X-ServerName" response header
--	200	--
blue.example.com	200	--
green.example.com	200	green.example.com

❯ curl -sI $VMGreenPubIp | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)

❯ curl -sI $VMGreenPubIp -H 'Host: blue.example.com' | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)

❯ curl -sI $VMGreenPubIp -H 'Host: green.example.com' | grep -E '^(HTTP/|Server|X-ServerName):?'
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)
X-ServerName: green.example.com