使用 Terraform 的过程是围绕 main.tf 文件进行，通过在 main.tf 文件中追加相应的内容实现资源的管理与编排。本文以创建云数据库 SQL Server 版实例为例进行说明。

使用示例

1. 以创建云数据库 SQL Server 版实例为例，追加以下内容到 main.tf 文件，参数内容需要自行修改，其中 my-instance-0 表示资源名字。

   resource "volcengine_rds_mssql_instance" "my-instance-0" {
    
     db_engine_version = "SQLServer_2019_Std"
     instance_type = "HA"
     subnet_id = ["subnet-****"]
     node_spec = "rds.mssql.se.ha.d4.4c16g"
     storage_space = 100
     super_account_password = "Test@****"
     instance_name = "Na****"
     
     charge_info {
       charge_type="PostPaid"
     }
   }
   

2. 进入 main.tf 所在目录，在终端执行以下命令，查看执行计划。terraform plan 执行后，在终端中会显示待创建实例的相关信息，示例如下。

   # [volcengine_rds_mssql_instance.my](http://volcengine_rds_mssql_instance.my)-instance-0 will be created
   + resource "volcengine_rds_mssql_instance" "my-instance-0" {
       + db_engine_version      = "SQLServer_2019_Std"
       + id                     = (known after apply)
       + instance_name          = "Na****"
       + instance_type          = "HA"
       + node_spec              = "rds.mssql.se.ha.d4.4c16g"
       + project_name           = (known after apply)
       + storage_space          = 100
       + subnet_id              = [
           + "subnet-****",
         ]
       + super_account_password = (sensitive value)
   
       + charge_info {
           + auto_renew           = (known after apply)
           + charge_end_time      = (known after apply)
           + charge_start_time    = (known after apply)
           + charge_status        = (known after apply)
           + charge_type          = "PostPaid"
           + overdue_reclaim_time = (known after apply)
           + overdue_time         = (known after apply)
           + period               = (known after apply)
         }
     }
   
   Plan: 1 to add, 0 to change, 0 to destroy.
   

3. 执行以下命令，执行应用计划。

   terraform apply
   

   执行后，在终端中会显示确认信息。如确认执行，则输入 yes；输入其他内容可取消执行计划。

   Do you want to perform these actions?
     Terraform will perform the actions described above.
     Only 'yes' will be accepted to approve.
     Enter a value:
   

   输入 yes 后，开始执行计划。执行后，终端中会有以下提示消息。

   $ terraform apply
   ...
   Do you want to perform these actions?
     Terraform will perform the actions described above.
     Only 'yes' will be accepted to approve.
     Enter a value: yes
   
   ...
   Apply complete! Resources: 1 added, 0 changed, 0 destroyed.