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Azurecloud~5 mins

Public IP addresses in Azure - Commands & Configuration

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Introduction
Public IP addresses let your cloud resources connect to the internet. They give your virtual machines or services a unique address that anyone on the internet can reach.
When you want your virtual machine to be accessible from the internet for a website or app.
When you need to connect to a cloud service remotely using SSH or RDP.
When you want to assign a fixed internet address to a load balancer.
When you want to expose a container or app running in the cloud to users outside your network.
When you need to test internet connectivity to your cloud resource.
Config File - public-ip.json
public-ip.json
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "resources": [
    {
      "type": "Microsoft.Network/publicIPAddresses",
      "apiVersion": "2022-05-01",
      "name": "myPublicIP",
      "location": "eastus",
      "sku": {
        "name": "Basic"
      },
      "properties": {
        "publicIPAllocationMethod": "Static",
        "idleTimeoutInMinutes": 4,
        "dnsSettings": {
          "domainNameLabel": "myuniquednslabel12345"
        }
      }
    }
  ]
}

This JSON file is an Azure Resource Manager template that creates a public IP address named myPublicIP in the eastus region.

The publicIPAllocationMethod is set to Static so the IP address does not change.

The dnsSettings section assigns a unique DNS label so you can reach the IP by a friendly name.

The idleTimeoutInMinutes controls how long the IP stays open without traffic.

Commands
This command creates a static public IP address named 'myPublicIP' in the 'eastus' region with a DNS label for easy access.
Terminal
az network public-ip create --resource-group myResourceGroup --name myPublicIP --allocation-method Static --location eastus --dns-name myuniquednslabel12345
Expected OutputExpected
{ "dnsSettings": { "domainNameLabel": "myuniquednslabel12345", "fqdn": "myuniquednslabel12345.eastus.cloudapp.azure.com" }, "id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/myResourceGroup/providers/Microsoft.Network/publicIPAddresses/myPublicIP", "ipAddress": "52.170.12.34", "ipTags": [], "location": "eastus", "name": "myPublicIP", "publicIPAllocationMethod": "Static", "resourceGroup": "myResourceGroup", "sku": { "name": "Basic" }, "type": "Microsoft.Network/publicIPAddresses" }
→
--allocation-method - Sets the IP to be static or dynamic
→
--dns-name - Assigns a DNS label for easier access
→
--resource-group - Specifies the Azure resource group to use
This command shows details about the public IP address to verify it was created correctly.
Terminal
az network public-ip show --resource-group myResourceGroup --name myPublicIP
Expected OutputExpected
{ "dnsSettings": { "domainNameLabel": "myuniquednslabel12345", "fqdn": "myuniquednslabel12345.eastus.cloudapp.azure.com" }, "id": "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/myResourceGroup/providers/Microsoft.Network/publicIPAddresses/myPublicIP", "ipAddress": "52.170.12.34", "ipTags": [], "location": "eastus", "name": "myPublicIP", "publicIPAllocationMethod": "Static", "resourceGroup": "myResourceGroup", "sku": { "name": "Basic" }, "type": "Microsoft.Network/publicIPAddresses" }
→
--resource-group - Specifies the resource group where the IP exists
→
--name - Specifies the name of the public IP to show
Key Concept

If you remember nothing else from this pattern, remember: a public IP address gives your cloud resource a fixed internet address so others can reach it.

Common Mistakes
Using dynamic allocation when you need a fixed IP
The IP address can change, breaking connections or DNS records.
Always specify --allocation-method Static if you want a permanent IP.
Not specifying a unique DNS label
Without a DNS label, you must use the IP address which is harder to remember and less user-friendly.
Use --dns-name with a unique label to create a friendly DNS name.
Creating the public IP in the wrong resource group or location
Resources may not connect properly if they are in different regions or groups than expected.
Double-check the --resource-group and --location flags to match your deployment.
Summary
Create a public IP address with az network public-ip create to give your resource an internet address.
Use --allocation-method Static to keep the IP fixed and --dns-name for a friendly domain name.
Verify the IP creation with az network public-ip show to see details like the IP address and DNS name.

Practice

(1/5)
1.

What is the main purpose of a Public IP address in Azure?

easy
A. To allow cloud resources to connect to the internet
B. To secure internal communication within a virtual network
C. To store data securely in the cloud
D. To monitor resource usage and billing

Solution

  1. Step 1: Understand Public IP role

    Public IP addresses enable resources to communicate over the internet.

  2. Step 2: Compare options

    Only To allow cloud resources to connect to the internet describes internet connectivity, others describe unrelated functions.

  3. Final Answer:

    To allow cloud resources to connect to the internet -> Option A

  4. Quick Check:

    Public IP = Internet access [OK]
Hint: Public IP means internet access for resources [OK]
Common Mistakes:
  • Confusing Public IP with internal network IP
  • Thinking Public IP stores data
  • Mixing Public IP with monitoring tools
2.

Which option correctly defines a Static Public IP address in Azure?

publicIpAllocationMethod: ?
easy
A. "Fixed"
B. "Dynamic"
C. "Manual"
D. "Static"

Solution

  1. Step 1: Recall allocation methods

    Azure uses "Static" and "Dynamic" as valid allocation methods for Public IPs.

  2. Step 2: Identify correct syntax

    "Static" is the exact string to assign for fixed IP allocation.

  3. Final Answer:

    "Static" -> Option D

  4. Quick Check:

    Static = fixed IP allocation [OK]
Hint: Static means fixed IP, use exact string "Static" [OK]
Common Mistakes:
  • Using "Manual" or "Fixed" which are invalid values
  • Confusing "Dynamic" with static allocation
  • Omitting quotes around the string
3.

Given this Azure CLI command, what will be the SKU of the created Public IP?

az network public-ip create --name MyIP --resource-group MyGroup --sku Standard --allocation-method Static
medium
A. Standard
B. Basic
C. Premium
D. Dynamic

Solution

  1. Step 1: Identify SKU parameter

    The command includes "--sku Standard", which sets the SKU to Standard.

  2. Step 2: Understand SKU options

    Standard and Basic are common SKUs; Premium is not valid here, Dynamic is allocation method.

  3. Final Answer:

    Standard -> Option A

  4. Quick Check:

    --sku Standard means Standard SKU [OK]
Hint: Look for --sku value to find SKU type [OK]
Common Mistakes:
  • Confusing allocation method with SKU
  • Assuming default SKU is Basic without checking
  • Selecting Dynamic which is not a SKU
4.

Identify the error in this Azure Resource Manager (ARM) template snippet for a Public IP:

{
  "type": "Microsoft.Network/publicIPAddresses",
  "apiVersion": "2021-02-01",
  "name": "myPublicIP",
  "properties": {
    "publicIPAllocationMethod": "Static",
    "sku": "Standard"
  }
}
medium
A. "name" must be inside "properties"
B. "sku" should be outside "properties" block
C. "publicIPAllocationMethod" value should be "Dynamic"
D. "apiVersion" is invalid

Solution

  1. Step 1: Check ARM template structure

    In ARM templates, "sku" is a top-level property, not inside "properties".

  2. Step 2: Validate other fields

    "publicIPAllocationMethod" can be "Static" inside properties; "name" is correctly placed; "apiVersion" is valid.

  3. Final Answer:

    "sku" should be outside "properties" block -> Option B

  4. Quick Check:

    SKU location in ARM = outside properties [OK]
Hint: "sku" is a sibling of "properties", not inside it [OK]
Common Mistakes:
  • Placing "sku" inside properties
  • Changing allocation method unnecessarily
  • Misplacing "name" property
5.

You want a Public IP that never changes and offers better reliability for a production web app. Which combination should you choose?

hard
A. Dynamic allocation with Basic SKU
B. Static allocation with Basic SKU
C. Static allocation with Standard SKU
D. Dynamic allocation with Standard SKU

Solution

  1. Step 1: Understand allocation methods

    Static allocation ensures the IP address does not change over time.

  2. Step 2: Choose SKU for reliability

    Standard SKU provides better features and reliability than Basic SKU.

  3. Step 3: Combine for production needs

    Static allocation with Standard SKU fits production web app requirements.

  4. Final Answer:

    Static allocation with Standard SKU -> Option C

  5. Quick Check:

    Static + Standard = fixed, reliable IP [OK]
Hint: Static + Standard SKU = fixed and reliable IP [OK]
Common Mistakes:
  • Choosing Dynamic allocation for fixed IP needs
  • Using Basic SKU for production reliability
  • Mixing SKU and allocation method incorrectly
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