VM commands (create, start, stop) in Azure - Deep Dive

Overview - VM commands (create, start, stop)

What is it?

Virtual Machines (VMs) are like computers in the cloud that you can control remotely. Using VM commands, you can create a new VM, start it when you want to use it, and stop it when you are done. These commands help you manage your cloud computers easily without needing physical hardware. They let you run programs, store data, and connect to the internet just like a regular computer.

Why it matters

Without VM commands, managing cloud computers would be slow and complicated. You would have to manually set up hardware or wait for someone else to do it. VM commands let you quickly create and control virtual computers, saving time and money. This makes it easier for businesses and individuals to run applications, test software, or host websites anytime they want.

Where it fits

Before learning VM commands, you should understand what a Virtual Machine is and basic cloud concepts like resources and regions. After mastering VM commands, you can explore more advanced topics like VM scaling, networking, and automation with scripts or cloud tools.

Mental Model

Core Idea

VM commands let you control cloud computers like turning a real computer on, off, or setting it up from scratch.

Think of it like...

Imagine a remote-controlled toy car: you can build it (create), start driving it (start), and stop it when you want to pause (stop). VM commands work the same way but for cloud computers.

┌───────────────┐      create      ┌───────────────┐
│               │ ──────────────▶ │               │
│   No VM yet   │                  │   VM Created  │
│               │                  │               │
└───────────────┘                  └───────────────┘
       ▲                                  │
       │                                  │ start
       │                                  ▼
┌───────────────┐                  ┌───────────────┐
│               │                  │               │
│   VM Stopped  │ ◀─────────────  │   VM Running  │
│               │       stop      │               │
└───────────────┘                  └───────────────┘

Build-Up - 7 Steps

1

Foundation

Understanding Virtual Machines Basics

Concept: Learn what a Virtual Machine is and why it acts like a computer in the cloud.

A Virtual Machine (VM) is a software computer that runs inside a physical computer but behaves like a separate computer. It has its own operating system and applications. In Azure, VMs let you run programs without owning physical hardware. You can create, start, and stop these VMs anytime.

Result

You understand that a VM is a cloud computer you can control remotely.

Knowing what a VM is helps you see why commands to create, start, and stop are like managing a real computer remotely.

2

Foundation

Azure CLI Basics for VM Commands

Concept: Learn the Azure command-line tool to run VM commands.

Azure CLI is a tool you type commands into to control Azure resources. Before managing VMs, you install Azure CLI and log in with your Azure account. Commands start with 'az' and have parts like 'vm create' to make a VM, 'vm start' to turn it on, and 'vm stop' to turn it off.

Result

You can open a terminal and run basic Azure commands to manage cloud resources.

Understanding Azure CLI basics is essential because VM commands are run through this tool.

3

Intermediate

Creating a VM with az vm create

🤔Before reading on: do you think creating a VM requires specifying a location and image, or can you create it without details? Commit to your answer.

Concept: Learn how to create a VM by specifying its name, resource group, location, and operating system image.

To create a VM, you use the command: az vm create --resource-group MyResourceGroup --name MyVM --image UbuntuLTS --admin-username azureuser --generate-ssh-keys This command sets up a VM named 'MyVM' in the group 'MyResourceGroup' using the Ubuntu Linux image. It also creates SSH keys for secure login.

Result

A new VM is created and ready to use in your Azure account.

Knowing the required details to create a VM helps avoid errors and ensures your VM is set up correctly the first time.

4

Intermediate

Starting a VM with az vm start

🤔Before reading on: do you think a VM starts automatically after creation, or do you need to start it manually? Commit to your answer.

Concept: Learn how to start a VM that is stopped or deallocated using a simple command.

If your VM is stopped, you can start it with: az vm start --resource-group MyResourceGroup --name MyVM This command powers on the VM so you can connect and use it. Starting a VM allocates resources and makes it available.

Result

The VM changes from stopped to running state and is accessible.

Understanding that starting a VM allocates cloud resources helps manage costs and availability.

5

Intermediate

Stopping a VM with az vm stop

🤔Before reading on: do you think stopping a VM releases all resources and stops billing, or does it keep some resources reserved? Commit to your answer.

Concept: Learn how to stop a VM to save costs while keeping its data intact.

To stop a VM, run: az vm stop --resource-group MyResourceGroup --name MyVM This command shuts down the VM but keeps the disk and network settings. The VM is not running, so you are not billed for compute time, but storage costs remain.

Result

The VM is powered off but still exists in your account with data preserved.

Knowing the difference between stopping and deleting a VM helps control costs without losing data.

6

Advanced

Managing VM States and Billing Implications

🤔Before reading on: do you think stopping a VM and deallocating it are the same in Azure? Commit to your answer.

Concept: Understand the difference between stopping and deallocating a VM and how it affects billing.

In Azure, 'az vm stop' stops the VM but keeps resources allocated, so you still pay for them. To fully release resources and stop billing, you use 'az vm deallocate'. This command frees compute resources but keeps the VM's disks. Knowing this helps optimize costs.

Result

You can control when you pay for compute resources by choosing the right stop command.

Understanding VM states and billing prevents unexpected charges and helps manage cloud budgets effectively.

7

Expert

Automating VM Lifecycle with Scripts

🤔Before reading on: do you think VM commands can be combined in scripts to automate tasks, or must they be run manually one by one? Commit to your answer.

Concept: Learn how to write scripts that automate creating, starting, and stopping VMs for efficient cloud management.

You can write shell scripts or PowerShell scripts that run multiple Azure CLI commands in sequence. For example, a script can create a VM, wait for it to be ready, start it, and later stop it automatically. This automation saves time and reduces human error in managing many VMs.

Result

VM management becomes faster, repeatable, and less error-prone through automation.

Knowing how to automate VM commands is key for scaling cloud operations and maintaining consistency.

Under the Hood

When you run a VM command, Azure's control plane receives your request and interacts with the physical servers in data centers. Creating a VM involves allocating storage, networking, and compute resources, then installing the chosen operating system image. Starting a VM powers on the virtual hardware, connecting it to the network. Stopping a VM shuts down the OS and may release compute resources depending on the command. Azure tracks VM states to manage billing and resource allocation.

Why designed this way?

Azure separates VM lifecycle commands to give users control over resource usage and costs. Creating a VM is distinct from starting it to allow setup and configuration before use. Stopping versus deallocating lets users choose between saving costs or keeping resources reserved for faster restarts. This design balances flexibility, cost efficiency, and user control.

┌───────────────┐       ┌───────────────┐       ┌───────────────┐
│ User runs    │       │ Azure Control │       │ Physical      │
│ az vm create │──────▶│ Plane         │──────▶│ Data Center   │
│ command      │       │ processes     │       │ resources     │
└──────────────┘       └───────────────┘       └───────────────┘
       │                      │                       │
       │                      │                       │
       ▼                      ▼                       ▼
┌───────────────┐       ┌───────────────┐       ┌───────────────┐
│ VM resources  │◀──────│ VM state      │◀──────│ Hardware      │
│ allocated    │       │ updated       │       │ powered on/off│
└───────────────┘       └───────────────┘       └───────────────┘

Myth Busters - 4 Common Misconceptions

Quick: Does stopping a VM always stop all billing charges? Commit to yes or no.

Common Belief: Stopping a VM means you stop paying for it completely.

Reality: Stopping a VM stops compute charges but you still pay for storage and reserved resources unless you deallocate it.

Why it matters: Believing stopping stops all charges can lead to unexpected bills because storage costs continue.

Quick: Can you create a VM without specifying an image? Commit to yes or no.

Common Belief: You can create a VM without choosing an operating system image.

Reality: You must specify an image when creating a VM because it defines the OS and software installed.

Why it matters: Not specifying an image causes creation errors and confusion about what the VM runs.

Quick: Does starting a VM automatically configure networking? Commit to yes or no.

Common Belief: Starting a VM sets up its network connections automatically every time.

Reality: Networking is configured during creation; starting a VM only powers it on without changing network settings.

Why it matters: Assuming networking resets on start can cause connectivity issues if network was misconfigured earlier.

Quick: Is 'az vm stop' the same as deleting a VM? Commit to yes or no.

Common Belief: Stopping a VM deletes it from Azure.

Reality: Stopping a VM only powers it off; the VM and its data remain until explicitly deleted.

Why it matters: Confusing stop with delete can cause accidental data loss or unexpected resource usage.

Expert Zone

1

Stopping a VM without deallocating keeps the compute resources reserved, which can be useful for quick restarts but costs more.

2

Azure VM creation can be customized with extensions and scripts to automate software installation during setup.

3

The difference between 'stop' and 'deallocate' commands affects not just billing but also IP address retention and VM availability.

When NOT to use

VM commands are not ideal for managing large fleets manually; instead, use Azure Automation, ARM templates, or Terraform for scalable, repeatable deployments and lifecycle management.

Production Patterns

In production, teams automate VM lifecycle with CI/CD pipelines, use tags for resource tracking, and combine VM commands with monitoring tools to optimize uptime and costs.

Connections

Container Orchestration

VM commands manage full virtual machines, while container orchestration manages lightweight containers on VMs or servers.

Understanding VM commands helps grasp the underlying infrastructure that container platforms run on, bridging infrastructure and application deployment.

Remote Desktop Protocol (RDP)

Starting a VM enables remote access protocols like RDP or SSH to connect to the VM's desktop or shell.

Knowing VM states clarifies when remote connections are possible, linking VM commands to user access methods.

Project Management

Managing VM lifecycle commands is like managing project phases: setup (create), execution (start), and pause (stop).

This connection shows how cloud infrastructure management shares patterns with organizing work and resources in other fields.

Common Pitfalls

#1 Trying to create a VM without specifying a resource group.

Wrong approach:

az vm create --name MyVM --image UbuntuLTS --admin-username azureuser --generate-ssh-keys

Correct approach:

az vm create --resource-group MyResourceGroup --name MyVM --image UbuntuLTS --admin-username azureuser --generate-ssh-keys

Root cause:

Not understanding that resource groups organize and contain Azure resources, so they are required for creation.

#2 Stopping a VM expecting all charges to stop.

Wrong approach:

az vm stop --resource-group MyResourceGroup --name MyVM

Correct approach:

az vm deallocate --resource-group MyResourceGroup --name MyVM

Root cause:

Confusing 'stop' with 'deallocate' commands and their billing implications.

#3 Starting a VM that does not exist or is deleted.

Wrong approach:

az vm start --resource-group MyResourceGroup --name NonExistentVM

Correct approach:

az vm start --resource-group MyResourceGroup --name ExistingVM

Root cause:

Not verifying VM existence before running commands, leading to errors.

Key Takeaways

VM commands let you create, start, and stop cloud computers easily, giving you control like a physical PC.

Creating a VM requires specifying details like resource group and operating system image to set it up correctly.

Stopping a VM does not always stop billing; deallocating releases resources and reduces costs further.

Automating VM commands with scripts improves efficiency and consistency in managing cloud infrastructure.

Understanding VM states and commands helps prevent mistakes that cause unexpected charges or downtime.