Azure Network Load Balancer for Web Servers

A simple demo to run a network load balancer for load balancing traffic to web servers running Nginx on Azure VM.

🎯 Solution

🧰 Prerequisites

This demo, along with its instructions, scripts, and Bicep template, has been specifically designed to be executed in the northeurope region. However, with minimal modifications, you can also try running it in other regions of your choice (the specific steps for doing so are not covered in this context)
- 🛠 Azure CLI Installed & Configured - Get help here
- 🛠 Azure Function Core Tools - Get help here
- 🛠 Bicep Installed & Configured - Get help here
  - 🛠 [Optional] VS Code & Bicep Extenstions - Get help here
- jq - Get help here
- bash or git bash - Get help here

⚙️ Setting up the environment

Get the application code

git clone https://github.com/miztiik/azure-web-server-load-balancer.git
cd azure-web-server-load-balancer

🚀 Prepare the local environment

Ensure you have jq, Azure Cli and bicep working
```
jq --version
func --version
bicep --version
bash --version
az account show
```
🚀 Deploying the Solution
- Stack: Main Bicep The params required for the modules are in params.json. Modify them as needed. The helper deployment script deploy.sh will deploy the main.bicep file. This will create the following resoureces
  - Resource Group(RG)
  - VNet, Subnet & Virtual Machine
  - Virtual Machine(Ubuntu) - 2 - Defined in params.json named vmCount
    - Bootstrapped with custom libs using userData script - Installs Nginx
    - Install Azure Monitoring Agent
  - User Managed Identity - Identity attached to the VM with the following permissions,
    - Monitoring Metrics Publisher
  - Azure Load Balancer
    - Backend Pool
      - Attach VMs to the backend pool
    - Health Probe
    - Load Balancer Rule
    - Load Balancer Frontend IP
    - Load Balancer Outbound Rule
  Note - I hacked the template from another repo of mine, so you will see some unused resources(log analytics workspace/queues etc.,). You can safely ignore them, But do remember to clean up your Resource Group to avoid unnecessary costs.
```
# make deploy
sh deployment_scripts/deploy.sh
```
After successfully deploying the stack, Check the Resource Groups/Deployments section for the resources.

🔬 Testing the solution

You can find the load balancer public IP address in the resource blade. You can also get it from the Azure Portal.

WEB_SRV_IP="http://20.107.191.133/"
for i in range{1..10000}; do curl ${WEB_SRV_IP}; sleep 1; done

You should see an output like this,

 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-1</b> <b>10.0.0.5</b> on Fri May 26 22:07:28 UTC 2023 
 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-0</b> <b>10.0.0.4</b> on Fri May 26 22:07:25 UTC 2023 
 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-1</b> <b>10.0.0.5</b> on Fri May 26 22:07:28 UTC 2023 
 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-0</b> <b>10.0.0.4</b> on Fri May 26 22:07:25 UTC 2023 
 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-1</b> <b>10.0.0.5</b> on Fri May 26 22:07:28 UTC 2023 
 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-0</b> <b>10.0.0.4</b> on Fri May 26 22:07:25 UTC 2023 
 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-0</b> <b>10.0.0.4</b> on Fri May 26 22:07:25 UTC 2023 
 Hello World from miztiik-automation-vm <b>m-web-srv-web-server-lb-004-1</b> <b>10.0.0.5</b> on Fri May 26 22:07:28 UTC 2023

📒 Conclusion

In this demonstration, we have shown how to bootstrap a VM using userData to install Nginx and add load balancer in the front using Bicep. We have also shown how to use User Managed Identity to access Azure resources from the VM.
🧹 CleanUp

If you want to destroy all the resources created by the stack, Execute the below command to delete the stack, or you can delete the stack from console as well
- Resources created during Deploying The Solution
- Any other custom resources, you have created for this demo
```
# Delete from resource group
az group delete --name Miztiik_Enterprises_xxx --yes
# Follow any on-screen prompt
```
This is not an exhaustive list, please carry out other necessary steps as maybe applicable to your needs.

📌 Who is using this

This repository aims to show how to Bicep to new developers, Solution Architects & Ops Engineers in Azure.

💡 Help/Suggestions or 🐛 Bugs

Thank you for your interest in contributing to our project. Whether it is a bug report, new feature, correction, or additional documentation or solutions, we greatly value feedback and contributions from our community. Start here