Azure DNS basics - Mini Project: Build & Apply

Azure DNS basics

📖 Scenario: You are setting up a simple website and want to manage its domain name using Azure DNS. This will help direct visitors to your website by translating the domain name into the website's IP address.

🎯 Goal: Build an Azure DNS zone and add a DNS record to point a domain name to an IP address.

📋 What You'll Learn

Create an Azure DNS zone named exactly example.com

Create a variable for the resource group name myResourceGroup

Add an A record named www with IP address 10.1.2.3

Complete the DNS zone configuration with the A record included

💡 Why This Matters

🌍 Real World

Managing domain names and DNS records is essential for directing internet traffic to websites and services.

💼 Career

Cloud engineers and administrators often configure DNS zones and records to ensure users can reach applications reliably.

1

Create the Azure DNS zone

Create an Azure DNS zone resource named dns_zone with the name example.com.

Azure

# Your code here to create dns_zone with name 'example.com'

Hint

Use a dictionary with keys name and type to define the DNS zone.

2

Set the resource group name

Create a variable called resource_group and set it to the string myResourceGroup.

Azure

dns_zone = {
    "name": "example.com",
    "type": "Microsoft.Network/dnsZones"
}
# Your code here to set resource_group to 'myResourceGroup'

Hint

Assign the exact string myResourceGroup to the variable resource_group.

3

Add an A record to the DNS zone

Create a dictionary called a_record representing an A record with name set to www and ipv4_address set to 10.1.2.3.

Azure

dns_zone = {
    "name": "example.com",
    "type": "Microsoft.Network/dnsZones"
}
resource_group = "myResourceGroup"
# Your code here to create a_record with name 'www' and ipv4_address '10.1.2.3'

Hint

Use keys name, type, and ipv4_address in the dictionary.

4

Complete the DNS zone with the A record

Add the a_record inside the dns_zone dictionary under the key records as a list containing the single A record.

Azure

dns_zone = {
    "name": "example.com",
    "type": "Microsoft.Network/dnsZones"
}
resource_group = "myResourceGroup"
a_record = {
    "name": "www",
    "type": "A",
    "ipv4_address": "10.1.2.3"
}
# Your code here to add 'records' key with a_record list to dns_zone

Hint

Add a key records to dns_zone with a list containing a_record.

Practice

1. What is the main purpose of Azure DNS?

easy

A. To monitor network traffic in real-time

B. To store files and documents securely

C. To run virtual machines in the cloud

D. To manage domain names and translate them to IP addresses

Solution

1. Step 1: Understand Azure DNS role

   Azure DNS is used to manage domain names and their records inside Azure.

2. Step 2: Identify main function

   It translates domain names into IP addresses so users can find services on the internet.

3. Final Answer:

   To manage domain names and translate them to IP addresses -> Option D

4. Quick Check:

   Azure DNS = Domain name management [OK]

Hint: Azure DNS handles domain names, not files or VMs [OK]

Common Mistakes:

• Confusing DNS with storage services
• Thinking Azure DNS runs virtual machines
• Mixing DNS with network monitoring

2. Which of the following is the correct way to create a DNS zone in Azure CLI?

easy

A. az network dns zone create -g MyResourceGroup -n example.com

B. az dns create zone -g MyResourceGroup -n example.com

C. az network create dnszone -g MyResourceGroup -n example.com

D. az dns zone new -g MyResourceGroup -n example.com

Solution

1. Step 1: Recall Azure CLI syntax for DNS zone creation

   The correct command uses 'az network dns zone create' with resource group and zone name.

2. Step 2: Compare options

   Only az network dns zone create -g MyResourceGroup -n example.com matches the correct Azure CLI syntax for creating a DNS zone.

3. Final Answer:

   az network dns zone create -g MyResourceGroup -n example.com -> Option A

4. Quick Check:

   Correct Azure CLI DNS zone command = az network dns zone create -g MyResourceGroup -n example.com [OK]

Hint: Remember 'az network dns zone create' for DNS zones [OK]

Common Mistakes:

• Using incorrect command verbs like 'new' or 'create zone'
• Omitting 'network' in the command
• Mixing up command order or parameters

3. Given this Azure CLI command:
az network dns record-set a add-record -g MyRG -z example.com -n www -a 10.0.0.1
What does this command do?

medium

A. Creates a DNS zone named 'www' in resource group MyRG

B. Creates an A record named 'www' pointing to IP 10.0.0.1 in example.com zone

C. Deletes the A record named 'www' in example.com zone

D. Adds a CNAME record pointing 'www' to 10.0.0.1

Solution

1. Step 1: Analyze command components

   The command adds an A record ('-a') named 'www' with IP 10.0.0.1 to the DNS zone 'example.com' in resource group 'MyRG'.

2. Step 2: Confirm record type and action

   'add-record' means creating a record, and 'a' specifies an A record (IP address).

3. Final Answer:

   Creates an A record named 'www' pointing to IP 10.0.0.1 in example.com zone -> Option B

4. Quick Check:

   Command adds A record 'www' with IP 10.0.0.1 [OK]

Hint: A record = IP address, add-record means create [OK]

Common Mistakes:

• Confusing A record with CNAME
• Thinking the command deletes records
• Misreading '-n' as zone name instead of record name

4. You run this command to add a TXT record:
az network dns record-set txt add-record -g RG1 -z example.com -n info -v "verification=12345"
But it fails with an error. What is the likely cause?

medium

A. The '-v' parameter is invalid; it should be '-a' for TXT records

B. The record name '-n' cannot be 'info' for TXT records

C. The TXT record value must be enclosed in single quotes, not double quotes

D. The resource group name 'RG1' is missing

Solution

1. Step 1: Check TXT record syntax

   TXT record values often require single quotes to avoid shell parsing errors.

2. Step 2: Identify error cause

   Using double quotes can cause the shell to misinterpret the value, leading to failure.

3. Final Answer:

   The TXT record value must be enclosed in single quotes, not double quotes -> Option C

4. Quick Check:

   Use single quotes for TXT values to avoid errors [OK]

Hint: Use single quotes for TXT record values in CLI [OK]

Common Mistakes:

• Using wrong parameter '-a' instead of '-v' for TXT
• Assuming record name restrictions incorrectly
• Ignoring resource group existence

5. You want to create a DNS zone for your domain 'myapp.com' and add two records: an A record for 'app' pointing to 192.168.1.10 and a CNAME record for 'www' pointing to 'app.myapp.com'. Which sequence of Azure CLI commands correctly achieves this?

hard

A. 1) az network dns zone create -g RG -n myapp.com2) az network dns record-set a add-record -g RG -z myapp.com -n app -a 192.168.1.103) az network dns record-set cname set-record -g RG -z myapp.com -n www -c app.myapp.com

B. 1) az network dns zone create -g RG -n myapp.com2) az network dns record-set cname add-record -g RG -z myapp.com -n app -c 192.168.1.103) az network dns record-set a set-record -g RG -z myapp.com -n www -a app.myapp.com

C. 1) az dns zone create -g RG -n myapp.com2) az network dns record-set a add-record -g RG -z myapp.com -n app -a 192.168.1.103) az network dns record-set cname add-record -g RG -z myapp.com -n www -c app.myapp.com

D. 1) az network dns zone create -g RG -n myapp.com2) az network dns record-set a add-record -g RG -z myapp.com -n app -a 192.168.1.103) az network dns record-set cname add-record -g RG -z myapp.com -n www -a app.myapp.com

Solution

1. Step 1: Create DNS zone

   Use 'az network dns zone create' with resource group and domain name to create the zone.

2. Step 2: Add A record for 'app'

   Use 'az network dns record-set a add-record' with correct parameters to add IP address record.

3. Step 3: Add CNAME record for 'www'

   Use 'az network dns record-set cname set-record' to point 'www' to 'app.myapp.com'.

4. Final Answer:

   1) az network dns zone create -g RG -n myapp.com
   2) az network dns record-set a add-record -g RG -z myapp.com -n app -a 192.168.1.10
   3) az network dns record-set cname set-record -g RG -z myapp.com -n www -c app.myapp.com -> Option A

5. Quick Check:

   Zone create + A record + CNAME set-record = 1) az network dns zone create -g RG -n myapp.com
   2) az network dns record-set a add-record -g RG -z myapp.com -n app -a 192.168.1.10
   3) az network dns record-set cname set-record -g RG -z myapp.com -n www -c app.myapp.com [OK]

Hint: Use 'add-record' for A, 'set-record' for CNAME [OK]

Common Mistakes:

• Using wrong commands like 'az dns zone create'
• Mixing up 'add-record' and 'set-record' for CNAME
• Assigning IP to CNAME record