Alibaba Cloud terraform example for kubernetes cluster

A terraform example to launching a kubernetes cluster in alibaba cloud.

These types of the module resource are supported:

• VPC
• Subnet
• ECS Instance
• Security Group
• Nat Gateway
• Kubernetes

Usage

This example can specify the following arguments to create user-defined kuberntes cluster

• alicloud_access_key: The Alicloud Access Key ID
• alicloud_secret_key: The Alicloud Access Secret Key
• region: The ID of region in which launching resources
• k8s_name_prefix: The name prefix of kubernetes cluster
• k8s_number: The number of kubernetes cluster
• k8s_worker_number: The number of worker nodes in each kubernetes cluster
• k8s_pod_cidr: The kubernetes pod cidr block. It cannot be equals to vpc's or vswitch's and cannot be in them. If vpc's cidr block is 172.16.XX.XX/XX, it had better to 192.168.XX.XX/XX or 10.XX.XX.XX/XX
• k8s_service_cidr: The kubernetes service cidr block. Its setting rule is same as k8s_pod_cidr
• Other kubernetes cluster arguments

Note: In order to avoid some needless error, you had better to set new_nat_gateway to true. Otherwise, you must you must ensure you specified vswitches can access internet before running the example.

Planning phase

terraform plan

Apply phase

terraform apply

Destroy

terraform destroy

Conditional creation

This example can support the following creating kubernetes cluster scenario by setting different arguments.

1. Create a new vpc, vswitches and nat gateway for the cluster.

You can specify the following user-defined arguments:

• vpc_name: A new vpc name
• vpc_cidr: A new vpc cidr block
• vswitch_name_prefix: The name prefix of several vswitches
• vswitch_cidrs: List of cidr blocks for several new vswitches

variable "profile" {
  default = "default"
}

variable "region" {
  default = "cn-hangzhou"
}

data "alicloud_vpcs" "default" {
  is_default = true
}

module "k8s" {
  source = "../"

  new_nat_gateway       = true
  vpc_name              = "tf-k8s-vpc"
  vpc_cidr              = "10.0.0.0/8"
  vswitch_name_prefix   = "tf-k8s-vsw"
  vswitch_cidrs         = ["10.1.0.0/16", "10.2.0.0/16", "10.3.0.0/16"]
  master_instance_types = ["ecs.n1.medium", "ecs.c5.large", "ecs.n1.medium"]
  worker_instance_types = ["ecs.n1.medium"]
  k8s_pod_cidr          = "192.168.5.0/24"
  k8s_service_cidr      = "192.168.2.0/24"
  k8s_worker_number     = 2
}

2. Using existing vpc and vswitches for the cluster.

You can specify the following user-defined arguments:

• vpc_id: A existing vpc ID
• vswitch_ids: List of IDs for several existing vswitches

variable "profile" {
  default = "default"
}

variable "region" {
  default = "cn-hangzhou"
}

data "alicloud_vpcs" "default" {
  is_default = true
}

module "k8s" {
  source = "../"

  vpc_id                = data.alicloud_vpcs.default.vpcs.0.id
  vswitch_ids           = ["vsw-bp1pog8voc3f42arr****", "vsw-bp1jxetj1386gqssg****", "vsw-bp1s1835sq5tjss9s****"]
  master_instance_types = ["ecs.n1.medium", "ecs.c5.large", "ecs.n1.medium"]
  worker_instance_types = ["ecs.n1.medium"]
  k8s_pod_cidr          = "192.168.5.0/24"
  k8s_service_cidr      = "192.168.2.0/24"
  k8s_worker_number     = 2
}

3. Using existing vpc, vswitches and nat gateway for the cluster.

You can specify the following user-defined arguments:

• vpc_id: A existing vpc ID
• vswitch_ids: List of IDs for several existing vswitches
• new_nat_gateway: Set it to false. But you must ensure you specified vswitches can access internet. In other words, you must set snat entry for each vswitch before running the example.

variable "profile" {
  default = "default"
}

variable "region" {
  default = "cn-hangzhou"
}

data "alicloud_vpcs" "default" {
  is_default = true
}

module "k8s" {
  source = "../"

  new_nat_gateway       = false
  vpc_id                = data.alicloud_vpcs.default.vpcs.0.id
  vswitch_ids           = ["vsw-bp1pog8voc3f42arr****", "vsw-bp1jxetj1386gqssg****", "vsw-bp1s1835sq5tjss9s****"]
  master_instance_types = ["ecs.n1.medium", "ecs.c5.large", "ecs.n1.medium"]
  worker_instance_types = ["ecs.n1.medium"]
  k8s_pod_cidr          = "192.168.5.0/24"
  k8s_service_cidr      = "192.168.2.0/24"
  k8s_worker_number     = 2
}

Examples

• complete example

Notes

From the version v1.4.0, the module has removed the following provider setting:

provider "alicloud" {
  profile                 = var.profile != "" ? var.profile : null
  shared_credentials_file = var.shared_credentials_file != "" ? var.shared_credentials_file : null
  region                  = var.region
  skip_region_validation  = var.skip_region_validation
  configuration_source    = "terraform-alicloud-modules/kubernetes"
}

If you still want to use the provider setting to apply this module, you can specify a supported version, like 1.3.0:

module "k8s" {
  source          = "terraform-alicloud-modules/kubernetes/alicloud"
  version         = "1.3.0"
  region          = "cn-hangzhou"
  profile         = "Your-Profile-Name"
  new_nat_gateway = true
  vpc_name        = "tf-k8s-vpc"
  // ...
}

If you want to upgrade the module to 1.4.0 or higher in-place, you can define a provider which same region with previous region:

provider "alicloud" {
  region  = "cn-hangzhou"
  profile = "Your-Profile-Name"
}
module "k8s" {
  source          = "terraform-alicloud-modules/kubernetes/alicloud"
  new_nat_gateway = true
  vpc_name        = "tf-k8s-vpc"
  // ...
}

or specify an alias provider with a defined region to the module using providers:

provider "alicloud" {
  region  = "cn-hangzhou"
  profile = "Your-Profile-Name"
  alias   = "hz"
}
module "k8s" {
  source          = "terraform-alicloud-modules/kubernetes/alicloud"
  providers  = {
    alicloud = alicloud.hz
  }
  new_nat_gateway = true
  vpc_name        = "tf-k8s-vpc"
  // ...
}

and then run terraform init and terraform apply to make the defined provider effect to the existing module state.

More details see How to use provider in the module

Terraform versions

Name	Version
terraform	>= 0.12.0
alicloud	>= 1.75.0

Submit Issues

If you have any problems when using this module, please opening a provider issue and let us know.

Note: There does not recommend to open an issue on this repo.

Authors

Created and maintained by Alibaba Cloud Terraform Team([email protected])

License

Mozilla Public License 2.0. See LICENSE for full details.

Reference

• Terraform-Provider-Alicloud Github
• Terraform-Provider-Alicloud Release
• Terraform-Provider-Alicloud Docs