Add address space to a VNet

vnet-app was sized tightly: its 10.1.0.0/24 is already split between subnet-web and subnet-app. The data team needs a new /24 called subnet-data. Give vnet-app a second address range, 10.1.1.0/24, and carve subnet-data from it.

1. Look at the address space and the subnets that fill it.

   az network vnet show -g rg-lab --name vnet-app --query addressSpace.addressPrefixesType it
   What's this?

   Shows virtual networks: their address space and subnets.

   • -g the resource group the resources live in
   • --name the name of the thing to look at or change

2. Give the VNet both ranges: the one it has, and the new one.

   az network vnet update -g rg-lab --name vnet-app --address-prefixes 10.1.0.0/24 10.1.1.0/24Type it
   What's this?

   Changes a virtual network, such as its address space or the DNS servers its VMs use.

   • -g the resource group the resources live in
   • --name the name of the thing to look at or change
   • --address-prefixes the full list of ranges, existing and new, separated by spaces

3. Create subnet-data in the new range.

   az network vnet subnet create -g rg-lab --vnet-name vnet-app --name subnet-data --address-prefixes 10.1.1.0/24Type it
   What's this?

   Adds a subnet: a range carved out of the virtual network's address space.

   • -g the resource group the resources live in
   • --vnet-name the virtual network
   • --name the name of the thing to look at or change

4. Answer the question below: does --address-prefixes add to the list or replace it?

   Does --address-prefixes add to the list or replace it?

   --address-prefixes

   The flag that sets a virtual network's address ranges.

   Check