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。下载连接

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

1. 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。

2. 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

1. 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"
       }
     }
   }
   

2. 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)}"
   }
   

3. 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"
                            }]
                        })
       }
   }
   

4. 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"
     }
   }
   

5. 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

1. 集群信息展示
   
   

2. 节点池展示
   
   

3. CCE插件展示
   

4. kubernetes资源展示