Container Service for Kubernetes:Use Terraform to create a node pool that has auto scaling enabled

Use Terraform to create a node pool that has auto scaling enabled

1. Modify the autoscaler-meta ConfigMap.

   1. Log on to the ACK console. In the left-side navigation pane, click Clusters.

   2. On the Clusters page, find the cluster that you want to manage and click its name. In the left-side navigation pane, choose Configurations > ConfigMaps.

   3. In the upper-left corner of the ConfigMap page, select kube-system from the Namespace drop-down list. Find the autoscaler-meta ConfigMap and click Edit in the Actions column.

   4. In the Edit panel, modify the value of the autoscaler-meta ConfigMap.

      You need to change the value of taints from the string type to the array type. In this case, change "taints":"" to "taints":[] in the Value text box.

   5. Click OK.

2. Synchronize the node pool.

   1. In the left-side navigation pane of the details page, choose Nodes > Node Pools.

   2. In the upper-right corner of the Node Pools page, click Sync Node Pool.

3. Use Terraform to create a node pool that has auto scaling enabled

   1. Create a node pool configuration file.

      • The following code provides an example on how to create a node pool that has auto scaling enabled in an existing ACK cluster:

        Show sample code

        provider "alicloud" {
        }
        # Create a node pool that has auto scaling enabled in an existing ACK cluster. 
        resource "alicloud_cs_kubernetes_node_pool" "at1" {
          # The ID of the ACK cluster where you want to create the node pool. 
          cluster_id           = "cf8cbb7e461a7456bafd5841f3a8****"
          name                 = "np-test"
          # The vSwitches that are used by nodes in the node pool. You must specify at least one vSwitch. 
          vswitch_ids          = ["vsw-bp1mdigyhmilu2h4v****"]
          instance_types       = ["ecs.e3.m****"]
          password             = "Hello1234"
         
          scaling_config {
            # The minimum number of nodes in the node pool. 
            min_size     = 1
            # The maximum number of nodes in the node pool. 
            max_size     = 5
          }
        
        }

      • The following code provides an example on how to create an ACK managed cluster and a node pool that has auto scaling enabled in the cluster: For more information about how to use Terraform to create a cluster, see Create an ACK managed cluster.

        Show sample code

        provider "alicloud" {
        }
        
        variable "name" {
          default    = "tf-test"
        }
        
        data "alicloud_zones" default {
          available_resource_creation  = "VSwitch"
        }
        data "alicloud_instance_types" "default" {
          availability_zone            = data.alicloud_zones.default.zones.0.id
          cpu_core_count               = 4
          memory_size                  = 8
          kubernetes_node_role         = "Worker"
        }
        
        resource "alicloud_vpc" "default" {
          cidr_block                   = "10.1.0.0/21"
        }
        resource "alicloud_vswitch" "default" {
          vpc_id                       = alicloud_vpc.default.id
          cidr_block                   = "10.1.1.0/24"
          zone_id            					 = data.alicloud_zones.default.zones.0.id
        }
        
        
        # Create an ACK managed cluster. 
        
        # Create a node pool that has auto scaling enabled in the cluster. 
        resource "alicloud_cs_kubernetes_node_pool" "at1" {
          cluster_id                   = "test12334"
          name                         = var.name
          vswitch_ids                  = [alicloud_vswitch.default.id]
          instance_types               = [data.alicloud_instance_types.default.instance_types.0.id]
        
        
          scaling_config {
            min_size     = 1
            max_size     = 5
          }
        
        }

        The following output indicates that the node pool is created.

        alicloud_cs_kubernetes_node_pool.default: Refreshing state... [id=cc7c582b0b2b546dcb80ae118eef0cb12:np651662dfc3e4440d9979360b24b1a009]
        alicloud_cs_managed_kubernetes.default: Refreshing state... [id=cc7c582b0b2b546dcb80ae118eef0cb12]
        
        Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
          ~ update in-place
        
        Terraform will perform the following actions:
        
          ............
        
        
                # (2 unchanged blocks hidden)
            }
        Plan: 5 to add, 0 to change, 0 to destroy.

   2. Run the terraform apply command to create the node pool.

   After the node pool is created, you can find the node pool on the Node Pools page. Auto Scaling Enabled appears below the name of the node pool.