Azure DevOps hosted ubuntu agent issue updating Application Gateway - azure

Question

I deployed some infra using Terraform, including an application gateway. Unfortunately not all settings can be set/updated with terraform. SO I have a shell script that updates the application gateway.
#!/bin/bash
SP_ID=${1}
SP_SECRET=${2}
TENANT_ID=${3}
SUBSCRIPTION=${4}
RG=${5}
az login --service-principal -u ${SP_ID} -p ${SP_SECRET} -t ${TENANT_ID}
az account set --subscription ${SUBSCRIPTION}
az account list -o table
# Get the name of the AG
echo "RG = ${RG}"
AG=$(az network application-gateway list --resource-group ${RG} | tail -n 1 | awk '{ print $2 }')
echo "AG = ${AG}"
# Get the AG backend pool name
BP=$(az network application-gateway address-pool list --resource-group ${RG} --gateway-name ${AG} | tail -n 1 | awk '{ print $1 }')
echo "Backend pool = ${BP}"
# Get the frontendip of the load balancer
LB=$(az network lb list --resource-group ${RG} | tail -n 1 | awk '{ print $2 }')
LBFEIP=$(az network lb frontend-ip list --lb-name ${LB} --resource-group ${RG} | tail -n 1 | awk '{ print $2 }')
echo "Load balancer = ${LB}"
echo "Frontend ip LB = ${LBFEIP}"
# Update the backend pool of the AG with the frontend ip of the loadbalancer
echo "Updating Backend address pool of AG ${AG}"
az network application-gateway address-pool update --gateway-name $AG --resource-group $RG --name $BP --servers ${LBFEIP}
# Update http settings
echo "Updating HTTP settings of AG ${AG}"
AG_HTS=$(az network application-gateway http-settings list --resource-group ${RG} --gateway-name ${AG} | tail -n 1 | awk '{ print $2 }')
az network application-gateway http-settings update --resource-group ${RG} --gateway-name ${AG} --name ${AG_HTS} --host-name-from-backend-pool true
# Update health probe
echo "Updating Health probe of AG ${AG}"
AG_HP=$(az network application-gateway probe list --resource-group ${RG} --gateway-name ${AG} | tail -n 1 | awk '{ print $4 }')
az network application-gateway probe update --resource-group ${RG} --gateway-name ${AG} --name ${AG_HP} --host '' --host-name-from-http-settings true
This script works fine running locally from my laptop but via the azure devops release pipeline I get the error:
ERROR: az network application-gateway address-pool list: error: argument --gateway-name: expected one argument
Somehow it cannot get the application gateway name when the script is running through the release pipeline.
Again, when running this script locally it works fine. Anyoone an idea of what I maybe missing here or can try?
I created the script on WSL Ubuntu and used a ubuntu hosted agent to publish the artifacts and also use a hosted ubuntu agent to deploy the script.

Answer 1

The error shows the problem directly. Your parameter "AG" is empty. You can get the parameter "AG" with the CLI command:
az network application-gateway list -g nancyweb --query "[].name" -o tsv
Or as you want with the output format table:
az network application-gateway list -g nancyweb -o table | tail -n 1 | awk '{print $3}'
You can get more details about az network application-gateway list. But if you want to get the specific one there is a point you should pay attention to because the list command shows all the application gateways.