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Terraform是一個開源工具，用于安全高效地預配和管理云基礎架構和資源。本文為您演示如何通過Terraform創建RDS PostgreSQL實例。

支持資源列表

支持Terraform編排和使用的RDS資源和數據源清單，請參見云數據庫RDS的資源和數據源。如果您還不了解Terraform，請參見Terraform產品介紹。

Resource
- alicloud_db_account：管理數據庫賬號
- alicloud_db_account_privilege：管理數據庫賬號訪問指定數據庫
- alicloud_db_backup_policy：管理數據庫備份策略
- alicloud_db_connection：管理數據庫的連接地址
- alicloud_db_database：管理數據庫
- alicloud_db_instance：管理RDS實例
- alicloud_db_read_write_splitting_connection：管理數據庫讀寫分離
- alicloud_db_readonly_instance：管理只讀實例
- alicloud_rds_account：管理實例賬號
- alicloud_rds_backup：管理實例備份
- alicloud_rds_clone_db_instance：恢復實例
- alicloud_rds_db_instance_endpoint：管理集群系列實例的Endpoint
- alicloud_rds_db_instance_endpoint_address：管理集群系列實例的外網Endpoint
- alicloud_rds_db_node：管理集群系列實例的節點
- alicloud_rds_db_proxy：管理數據庫代理
- alicloud_rds_ddr_instance：管理跨地域恢復
- alicloud_rds_instance_cross_backup_policy：管理實例跨地域備份策略
- alicloud_rds_parameter_group：管理參數模板
- alicloud_rds_service_linked_role：管理服務關聯角色（SLR）
- alicloud_rds_upgrade_db_instance：管理實例升級策略
Data Source
- alicloud_db_instance_class_infos：查詢實例規格信息
- alicloud_db_instance_classes：查詢實例資源信息
- alicloud_db_instance_engines：查詢實例引擎信息
- alicloud_db_instances：查詢實例信息
- alicloud_db_zones：查詢可用區信息
- alicloud_instance_keywords：查詢預留關鍵字信息
- alicloud_rds_accounts：查詢賬號信息
- alicloud_rds_backups：查詢備份信息
- alicloud_rds_character_set_names：查詢支持的字符集
- alicloud_rds_class_details：查詢實例規格的詳細信息
- alicloud_rds_collation_time_zones：查詢可用的字符集排序規則和時區信息
- alicloud_rds_cross_region_backups：查詢實例跨地域備份信息
- alicloud_rds_cross_regions：查詢實例支持跨地域備份的可用區信息
- alicloud_rds_modify_parameter_logs：查詢參數修改日志
- alicloud_rds_parameter_group：查詢參數模板信息
- alicloud_rds_slots：查詢復制槽信息

配置權限

使用Terraform，您需要一個阿里云賬號和賬號的訪問密鑰（AccessKey）。為確保您的阿里云賬號及云資源使用安全，如非必要應避免直接使用阿里云主賬號來訪問云數據庫RDS。建議您創建一個RAM用戶，獲取該用戶的AccessKey，并向其授予相應權限。

創建RAM用戶：
1. 訪問RAM用戶列表，單擊創建用戶。
2. 設置登錄名稱為rds-test-operator，選擇訪問方式為使用永久 AccessKey 訪問。
3. 單擊確定，創建RAM用戶并保存AccessKey ID與AccessKey Secret信息。
完成授權：
1. 訪問RAM用戶列表，單擊目標RAM用戶操作列的添加權限。
2. 在文本框中搜索AliyunRDS，選擇AliyunRDSFullAccess（具有RDS的完全控制權限）。
3. 在文本框中搜索VPC，選擇AliyunVPCFullAccess（具有VPC的完全控制權限）。
  說明
  本示例中在創建RDS實例時，會同時創建VPC和交換機。您也可以按需選擇權限策略或進行自定義策略，更多信息請參見創建自定義權限策略。
4. 單擊確認新增授權，完成授權操作。

操作步驟

安裝Terraform

使用阿里云Cloud Shell。阿里云Cloud Shell是一款幫助您運維的免費產品，預裝了Terraform的組件，并配置好身份憑證（credentials）。因此您可直接在Cloud Shell中運行Terraform的命令。詳情請參見Cloud Shell。
在本地安裝和配置Terraform，請參見在本地安裝和配置Terraform。
安裝完成后，您可以打開命令行終端，輸入terraform version，若返回版本信息表示已成功安裝。

編寫模板

Terraform通過命令實現對Terraform模板中所定義的資源進行創建、修改、查看和刪除。

創建執行目錄并進入。
說明
需要為每個Terraform項目創建一個獨立的執行目錄。
- Linux或macOS：
```
sudo mkdir /usr/local/terraform
cd /usr/local/rds_terraform
```
  重要
  如果您使用的非root權限用戶，則還需要為rds_terraform目錄授權，使用sudo chown -R <當前用戶名>:<用戶所屬組名> /usr/local/terraform命令，將rds_terraform文件夾的owner修改為當前用戶。
- Windows：以D盤下創建rds_terraform文件夾為例，進入rds_terraform文件夾。
在執行目錄下，創建Terraform模板（terraform.tf）文件。
- Linux或macOS：
```
touch terraform.tf
```
- Windows：手動創建terraform.tf文件。

以查詢RDS PostgreSQL可用區信息為例，編輯terraform.tf文件，補充如下信息。

resource "alicloud_vpc" "main" {
  vpc_name       = "alicloud"
  cidr_block = "172.16.0.0/16"
}

resource "alicloud_vswitch" "main" {
  vpc_id            = alicloud_vpc.main.id
  cidr_block        = "172.16.192.0/20"
  zone_id = "cn-hangzhou-j"
  depends_on = [alicloud_vpc.main]
}

resource "alicloud_db_instance" "instance" {
  engine           = "PostgreSQL"
  engine_version   = "13.0"
  instance_type    = "pg.n2.2c.2m"
  instance_storage = "30"
  instance_charge_type = "Postpaid"
  vswitch_id       = alicloud_vswitch.main.id
}

運行模板

本示例以Windows操作系統下使用本地安裝的Terraform為例，在其他操作系統中，運行命令的具體方式可能會有所不同。

進入D:\rds_terraform目錄下，初始化加載模塊，包括Provider等模板。

terraform init

返回結果

Initializing the backend...
Initializing provider plugins...
- Finding latest version of hashicorp/alicloud...
- Installing hashicorp/alicloud v1.226.0...
- Installed hashicorp/alicloud v1.226.0 (signed by HashiCorp)
Terraform has created a lock file .terraform.lock.hcl to record the provider
selections it made above. Include this file in your version control repository
so that Terraform can guarantee to make the same selections by default when
you run "terraform init" in the future.

?
│ Warning: Additional provider information from registry
│
│ The remote registry returned warnings for registry.terraform.io/hashicorp/alicloud:
│ - For users on Terraform 0.13 or greater, this provider has moved to aliyun/alicloud. Please update your source in required_providers.
?
Terraform has been successfully initialized!

You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.

If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.

驗證模板語法是否正確。

terraform validate

返回結果：

Success! The configuration is valid.

預覽模板。

terraform plan

返回結果

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # alicloud_db_instance.instance will be created
  + resource "alicloud_db_instance" "instance" {
      + acl                        = (known after apply)
      + auto_upgrade_minor_version = (known after apply)
      + babelfish_port             = (known after apply)
      + ca_type                    = (known after apply)
      + category                   = (known after apply)
      + connection_string          = (known after apply)
      + connection_string_prefix   = (known after apply)
      + create_time                = (known after apply)
      + db_instance_storage_type   = (known after apply)
      + db_instance_type           = (known after apply)
      + db_is_ignore_case          = (known after apply)
      + db_time_zone               = (known after apply)
      + deletion_protection        = false
      + engine                     = "PostgreSQL"
      + engine_version             = "14.0"
      + force_restart              = false
      + ha_config                  = (known after apply)
      + id                         = (known after apply)
      + instance_charge_type       = "Postpaid"
      + instance_storage           = 30
      + instance_type              = "pg.n2.2c.2m"
      + maintain_time              = (known after apply)
      + monitoring_period          = (known after apply)
      + node_id                    = (known after apply)
      + port                       = (known after apply)
      + private_ip_address         = (known after apply)
      + replication_acl            = (known after apply)
      + resource_group_id          = (known after apply)
      + role_arn                   = (known after apply)
      + security_group_id          = (known after apply)
      + security_group_ids         = (known after apply)
      + security_ip_mode           = "normal"
      + security_ips               = (known after apply)
      + server_cert                = (known after apply)
      + server_key                 = (known after apply)
      + sql_collector_config_value = 30
      + sql_collector_status       = (known after apply)
      + ssl_action                 = (known after apply)
      + ssl_connection_string      = (known after apply)
      + ssl_status                 = (known after apply)
      + status                     = (known after apply)
      + target_minor_version       = (known after apply)
      + tcp_connection_type        = (known after apply)
      + tde_status                 = (known after apply)
      + vpc_id                     = (known after apply)
      + vswitch_id                 = (known after apply)
      + zone_id                    = (known after apply)
      + zone_id_slave_a            = (known after apply)
      + zone_id_slave_b            = (known after apply)

      + babelfish_config (known after apply)

      + parameters (known after apply)

      + pg_hba_conf (known after apply)
    }

  # alicloud_vpc.main will be created
  + resource "alicloud_vpc" "main" {
      + cidr_block            = "172.16.0.0/16"
      + create_time           = (known after apply)
      + id                    = (known after apply)
      + ipv6_cidr_block       = (known after apply)
      + ipv6_cidr_blocks      = (known after apply)
      + name                  = (known after apply)
      + resource_group_id     = (known after apply)
      + route_table_id        = (known after apply)
      + router_id             = (known after apply)
      + router_table_id       = (known after apply)
      + secondary_cidr_blocks = (known after apply)
      + status                = (known after apply)
      + user_cidrs            = (known after apply)
      + vpc_name              = "alicloud"
    }

  # alicloud_vswitch.main will be created
  + resource "alicloud_vswitch" "main" {
      + availability_zone    = (known after apply)
      + cidr_block           = "172.16.192.0/20"
      + create_time          = (known after apply)
      + id                   = (known after apply)
      + ipv6_cidr_block      = (known after apply)
      + ipv6_cidr_block_mask = (known after apply)
      + name                 = (known after apply)
      + status               = (known after apply)
      + vpc_id               = (known after apply)
      + vswitch_name         = (known after apply)
      + zone_id              = "cn-hangzhou-j"
    }

  Plan: 3 to add, 0 to change, 0 to destroy.

應用模板配置。

terraform apply

出現如下配置信息后，確認配置信息并輸入yes，開始創建。

返回結果

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # alicloud_db_instance.instance will be created
  + resource "alicloud_db_instance" "instance" {
      + acl                        = (known after apply)
      + auto_upgrade_minor_version = (known after apply)
      + babelfish_port             = (known after apply)
      + ca_type                    = (known after apply)
      + category                   = (known after apply)
      + connection_string          = (known after apply)
      + connection_string_prefix   = (known after apply)
      + create_time                = (known after apply)
      + db_instance_storage_type   = (known after apply)
      + db_instance_type           = (known after apply)
      + db_is_ignore_case          = (known after apply)
      + db_time_zone               = (known after apply)
      + deletion_protection        = false
      + engine                     = "PostgreSQL"
      + engine_version             = "14.0"
      + force_restart              = false
      + ha_config                  = (known after apply)
      + id                         = (known after apply)
      + instance_charge_type       = "Postpaid"
      + instance_storage           = 30
      + instance_type              = "pg.n2.2c.2m"
      + maintain_time              = (known after apply)
      + monitoring_period          = (known after apply)
      + node_id                    = (known after apply)
      + port                       = (known after apply)
      + private_ip_address         = (known after apply)
      + replication_acl            = (known after apply)
      + resource_group_id          = (known after apply)
      + role_arn                   = (known after apply)
      + security_group_id          = (known after apply)
      + security_group_ids         = (known after apply)
      + security_ip_mode           = "normal"
      + security_ips               = (known after apply)
      + server_cert                = (known after apply)
      + server_key                 = (known after apply)
      + sql_collector_config_value = 30
      + sql_collector_status       = (known after apply)
      + ssl_action                 = (known after apply)
      + ssl_connection_string      = (known after apply)
      + ssl_status                 = (known after apply)
      + status                     = (known after apply)
      + target_minor_version       = (known after apply)
      + tcp_connection_type        = (known after apply)
      + tde_status                 = (known after apply)
      + vpc_id                     = (known after apply)
      + vswitch_id                 = (known after apply)
      + zone_id                    = (known after apply)
      + zone_id_slave_a            = (known after apply)
      + zone_id_slave_b            = (known after apply)

      + babelfish_config (known after apply)

      + parameters (known after apply)

      + pg_hba_conf (known after apply)
    }

  # alicloud_vpc.main will be created
  + resource "alicloud_vpc" "main" {
      + cidr_block            = "172.16.0.0/16"
      + create_time           = (known after apply)
      + id                    = (known after apply)
      + ipv6_cidr_block       = (known after apply)
      + ipv6_cidr_blocks      = (known after apply)
      + name                  = (known after apply)
      + resource_group_id     = (known after apply)
      + route_table_id        = (known after apply)
      + router_id             = (known after apply)
      + router_table_id       = (known after apply)
      + secondary_cidr_blocks = (known after apply)
      + status                = (known after apply)
      + user_cidrs            = (known after apply)
      + vpc_name              = "alicloud"
    }

  # alicloud_vswitch.main will be created
  + resource "alicloud_vswitch" "main" {
      + availability_zone    = (known after apply)
      + cidr_block           = "172.16.192.0/20"
      + create_time          = (known after apply)
      + id                   = (known after apply)
      + ipv6_cidr_block      = (known after apply)
      + ipv6_cidr_block_mask = (known after apply)
      + name                 = (known after apply)
      + status               = (known after apply)
      + vpc_id               = (known after apply)
      + vswitch_name         = (known after apply)
      + zone_id              = "cn-hangzhou-j"
    }

Plan: 3 to add, 0 to change, 0 to destroy.

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

  Enter a value:

出現類似如下日志時，表示創建成功。

配置日志

alicloud_vpc.main: Creating...
alicloud_vpc.main: Creation complete after 9s [id=vpc-bp1apzkp9l5gkuq0****]
alicloud_vswitch.main: Creating...
alicloud_vswitch.main: Creation complete after 4s [id=vsw-bp1lmhzc42h5cc0t8****]
alicloud_db_instance.instance: Creating...
alicloud_db_instance.instance: Still creating... [10s elapsed]
alicloud_db_instance.instance: Still creating... [20s elapsed]
...
alicloud_db_instance.instance: Still creating... [6m1s elapsed]
alicloud_db_instance.instance: Still creating... [6m11s elapsed]
alicloud_db_instance.instance: Creation complete after 6m20s [id=pgm-bp10ckaa2340****]

Apply complete! Resources: 3 added, 0 changed, 0 destroyed.

查看結果。
訪問RDS實例列表，查看已創建的RDS實例。

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Terraform集成示例

支持資源列表

配置權限

操作步驟

安裝Terraform

編寫模板

運行模板

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