Terraform概述

Terraform 是由 HashiCorp 创建的开源“基础架构即代码”工具。

作为一种声明式编码工具，Terraform 使开发人员能够使用一种称为 HCL（HashiCorp 配置语言）的高级配置语言来描述运行应用程序所需的“最终状态”云或本地基础设施。然后，它会生成一个达到该最终状态的计划，并执行该计划来供应基础设施。

terraform通过provider调用云厂商的API进行资源管理

安装terraform

Terraform是以二进制可执行文件发布，您只需下载terraform二进制文件，然后将terraform可执行文件添加到系统环境变量PATH中即可。

wget https://releases.hashicorp.com/terraform/1.6.6/terraform_1.6.6_linux_amd64.zip
unzip terraform_1.6.6_linux_amd64.zip
mv terraform /usr/local/bin/
terraform -version

配置认证

Terraform支持编排华为云上的各种云资源，使用Terraform管理华为云资源前，您需要获取AK/SK，并在Terraform上进行配置，从而认证鉴权。
您可以使用如下两种方式配置Terraform

在Terraform配置文件中添加AK/SK信息

provider "huaweicloud" {
  region     = "cn-north-1"
  access_key = "my-access-key"
  secret_key = "my-secret-key"
}

region：区域，即需要创建管理哪个区域的资源。您可以在这里查询华为云支持的区域

access_key：密钥ID，即AK。查询方法请参见访问密钥。

secret_key：访问密钥，即SK。查询方法请参见访问密钥。

在系统环境变量中添加AK/SK信息

export HW_REGION_NAME="cn-north-1"
export HW_ACCESS_KEY="my-access-key"
export HW_SECRET_KEY="my-secret-key"

更多配置参数请参考：https://registry.terraform.io/providers/huaweicloud/huaweicloud/latest/docs

安装华为云provider

下载华为云provider：https://github.com/huaweicloud/terraform-provider-huaweicloud/releases

如何加速下载华为云 provider：https://support.huaweicloud.com/terraform_faq/index.html

准备terraform配置文件

准备provider的version文件，huaweicloud为本地安装，kubernetes在线安装

terraform {
  required_version = ">= 0.13"

  required_providers {
    huaweicloud = {
      source = "local-registry/huaweicloud/huaweicloud"
      version = ">= 1.60.1"
    }
    kubernetes = {
      source = "hashicorp/kubernetes"
      version = ">= 2.24.0"
    }
  }
}

准备provider需要的auth文件，mycluster是资源名称，请替换为实际值

provider "huaweicloud" {
  region        = "cn-north-4"
  access_key     = "***"   #AK
  secret_key     = "***"   #SK
}

provider "kubernetes" {
  host                   = huaweicloud_cce_cluster.mycluster.certificate_clusters[0].server
  cluster_ca_certificate = "${base64decode(huaweicloud_cce_cluster.mycluster.certificate_clusters[0].certificate_authority_data)}"
  client_key             = "${base64decode(huaweicloud_cce_cluster.mycluster.certificate_users[0].client_key_data)}"
  client_certificate     = "${base64decode(huaweicloud_cce_cluster.mycluster.certificate_users[0].client_certificate_data)}"
}

准备需要创建的CCE资源文件

variable cce_node_password {
  description = "node password"
  type = string
  nullable = "false"
  sensitive = "true"  #不显示输入的密码
}
//创建vpc
resource "huaweicloud_vpc" "myvpc" {
  name = "vpc"
  cidr = "172.16.0.0/16"
}

//创建子网
resource "huaweicloud_vpc_subnet" "mysubnet" {
  name       = "subnet"
  cidr       = "172.16.0.0/16"
  gateway_ip = "172.16.0.1"

  //设置VPC的DNS信息
  primary_dns   = "100.125.1.250"
  secondary_dns = "100.125.21.250"
  vpc_id        = huaweicloud_vpc.myvpc.id
}

//创建CCE集群
resource "huaweicloud_cce_cluster" "mycluster" {
  name                   = "terraform-cce"
  flavor_id              = "cce.s1.small"
  vpc_id                 = huaweicloud_vpc.myvpc.id
  subnet_id              = huaweicloud_vpc_subnet.mysubnet.id
  container_network_type = "vpc-router"
  container_network_cidr = "10.128.0.0/10"
  kube_proxy_mode        = "iptables"
}

//创建节点池
resource "huaweicloud_cce_node_pool" "node_pool" {
  cluster_id               = huaweicloud_cce_cluster.mycluster.id
  name                     = "test-pool"
  subnet_id                = huaweicloud_vpc_subnet.mysubnet.id
  os                       = "Huawei Cloud EulerOS 2.0"
  initial_node_count       = 2    #节点池初始节点数
  flavor_id                = "c7.large.2"
  availability_zone        = "cn-north-4a"
  password                 = var.cce_node_password
  scall_enable             = true  #开启弹性伸缩
  min_node_count           = 1
  max_node_count           = 10
  scale_down_cooldown_time = 100
  priority                 = 1
  type                     = "vm"

  root_volume {
    size       = 40
    volumetype = "SAS"
  }
  data_volumes {
    size       = 100
    volumetype = "SAS"
  }
  labels = {
  //key         = value
    test        = "test"
  }

  taints {
    key = "test"
    value = "test"
    effect = "NoSchedule"
  }

}

data "huaweicloud_cce_addon_template" "metrics-server" {
  name = "metrics-server"
  cluster_id = huaweicloud_cce_cluster.mycluster.id
  version = "1.3.12"
}

//安装CCE插件metric-server
resource "huaweicloud_cce_addon" "metrics-server" {
    cluster_id = huaweicloud_cce_cluster.mycluster.id
    template_name = "metrics-server"
    version = "1.3.12"
    values {
       basic  = jsondecode(data.huaweicloud_cce_addon_template.metrics-server.spec).basic
       custom_json = jsonencode(
                        {
                            tolerations = [{
                                key      = "test"
                                operator = "Exists"
                            }]
                        })
       flavor_json = jsonencode({
                         replicas = 1
                         resources = [{
                             limitsCpu = "1000m"
                             limitsMem = "1000Mi"
                             requestsCpu = "200m"
                             requestsMem = "400Mi"
                         }]
                     })
    }
}

准备需要创建的kubernetes资源文件

resource "kubernetes_deployment_v1" "example" {
  metadata {
    name = "terraform-example"
    labels = {
      test = "MyExampleApp"
    }
  }

  spec {
    replicas = 1

    selector {
      match_labels = {
        test = "MyExampleApp"
      }
    }

    template {
      metadata {
        labels = {
          test = "MyExampleApp"
        }
      }

      spec {
        container {
          image = "nginx:1.17.4"
          name  = "example"

          resources {
            limits = {
              cpu    = "0.5"
              memory = "512Mi"
            }
            requests = {
              cpu    = "250m"
              memory = "50Mi"
            }
          }

          liveness_probe {
            http_get {
              path = "/"
              port = 80
            }
          }
        }
        toleration {
          key      = "test"
          operator = "Exists"
        }
      }
    }
  }
}
resource "kubernetes_service_v1" "example" {
  metadata {
    name = "terraform-example"
  }
  spec {
    selector = {
      test = "MyExampleApp"
    }
    port {
      port        = 80
      target_port = 80
    }

    type = "ClusterIP"
  }
}

使用命令创建以上资源

terraform init   #初始化provider
terraform plan   #查看计划
terraform apply -auto-approve  #执行计划

效果展示

集群信息展示

节点池展示

CCE插件展示

kubernetes资源展示