load-balancer-linux-cli-sample-nlb.md

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CLI Example - Load balance traffic to VMs for high availability - Azure | Microsoft Docs	This Azure CLI script example shows how to load balance traffic to VMs for high availability	load-balancer	load-balancer	KumudD	jeconnoc	tysonn			load-balancer	azurecli	sample		infrastructure	04/20/2018	kumud

Azure CLI script example: Load balance traffic to VMs for high availability

This Azure CLI script example creates everything needed to run several Ubuntu virtual machines configured in a highly available and load balanced configuration. After running the script, you will have three virtual machines, joined to an Azure Availability Set, and accessible through an Azure Load Balancer.

[!INCLUDE sample-cli-install]

[!INCLUDE quickstarts-free-trial-note]

Sample script

[!code-azurecli-interactivemain]

Clean up deployment

Run the following command to remove the resource group, VM, and all related resources.

az group delete --name myResourceGroup

Script explanation

This script uses the following commands to create a resource group, virtual machine, availability set, load balancer, and all related resources. Each command in the table links to command specific documentation.

Command	Notes
az group create	Creates a resource group in which all resources are stored.
az network vnet create	Creates an Azure virtual network and subnet.
az network public-ip create	Creates a public IP address with a static IP address and an associated DNS name.
az network lb create	Creates an Azure load balancer.
az network lb probe create	Creates a load balancer probe. A load balancer probe is used to monitor each VM in the load balancer set. If any VM becomes inaccessible, traffic is not routed to the VM.
az network lb rule create	Creates a load balancer rule. In this sample, a rule is created for port 80. As HTTP traffic arrives at the load balancer, it is routed to port 80 one of the VMs in the LB set.
az network lb inbound-nat-rule create	Creates load balancer Network Address Translation (NAT) rule. NAT rules map a port of the load balancer to a port on a VM. In this sample, a NAT rule is created for SSH traffic to each VM in the load balancer set.
az network nsg create	Creates a network security group (NSG), which is a security boundary between the internet and the virtual machine.
az network nsg rule create	Creates an NSG rule to allow inbound traffic. In this sample, port 22 is opened for SSH traffic.
az network nic create	Creates a virtual network card and attaches it to the virtual network, subnet, and NSG.
az vm availability-set create	Creates an availability set. Availability sets ensure application uptime by spreading the virtual machines across physical resources such that if failure occurs, the entire set is not effected.
az vm create	Creates the virtual machine and connects it to the network card, virtual network, subnet, and NSG. This command also specifies the virtual machine image to be used and administrative credentials.
az group delete	Deletes a resource group including all nested resources.

Next steps

For more information on the Azure CLI, see Azure CLI documentation.

Additional Azure Networking CLI script samples can be found in the Azure Networking documentation.