Spot Instances in AKS are discounted VMs that use Azure's spare capacity. This makes them a cost-effective strategy for running Kubernetes workloads. However, they can be evicted when Azure needs the resources back, so they're best for fault-tolerant tasks that are resilient to interruptions.

Creating Agent Pools with Spot Instances

1. Follow the steps to .

2. On the Add Azure Agent Pool page, select Spot from the Scale Set Priority list box.

1. In the Scale Set Eviction Policy list box, specify how the virtual machines (VMs) should be managed when they need to be evicted due to capacity constraints or other reasons:

• Delete: When a VM is evicted, it is completely removed from the scale set and cannot be recovered. This option is typically used when you do not need to preserve the VM's state and prefer to free up resources immediately.

• Deallocate: The evicted VM is stopped and its resources are released, but its configuration and state are preserved and it can be restarted later. This is useful when you want to save the VM's state for potential future use.

1. In the Spot Max Price field, Specify the highest price you are willing to pay for a spot instance.

Configuring a DuploCloud Service to use Spot Instances

When or a Service, select Tolerate spot instances.

Tolerations will be entered by default in the Add Service page, Advanced Options, Other Container Config field.

When you create agent pools to run Azure Kubernetes (AKS) workloads, you create groups of agents available to a pipeline. When you run the pipeline, the pipeline selects the agent that best meets the performance demands of that pipeline.

Autoscaling can be enabled when creating agent pools in the DuploCloud Portal. Each agent pool contains nodes backed by virtual host machines.

Prerequisites

To create an agent pool using availability zones, you must first create a in the Infrastructure. For agent pools not using availability zones, skip this step.

Adding an agent pool

Create an Azure agent pool for an existing Host in the DuploCloud Portal.

1. From the DuploCloud Portal, navigate to Cloud Services -> Hosts.

2. Select the Azure Agent Pool tab, and Click Add. The Add Azure Agent Pool page displays.

1. Provide inputs for the Id, Instance Type, Min Capacity, Max Capacity, and Desired Capacity fields.

2. Enter allocation tags in the Allocation Tags field, if required.

3. Optionally, select one or more availability zones from the Availability Zones list box. If you select availability zones, you must create a

Editing an agent pool

Edit an agent pool:

1. Select Cloud Services -> Hosts from the navigation menu.

2. Select the Azure Agent Pool tab. The Azure Agent Pool page displays.

3. In the Name column, select the agent pool that you want to edit.