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本文介绍如何使用Terraform申请、修改和释放RDS PostgreSQL实例的外网地址，以及查询和切换交换机。

前提条件

  • 已创建RDS PostgreSQL实例，详情请参见创建RDS PostgreSQL实例。

  • 实例状态为运行中，您可以通过如下两种方式查看：

    • 参见查询实例详情查看参数status，如果取值为Runing则表示实例状态为运行中。

    • 前往RDS管理控制台，切换到目标地域，找到指定实例后，查看实例状态。

申请外网地址

  1. 在terraform.tf文件中增加resource "alicloud_db_connection" "extranet" {}配置项，具体配置如下：

    ...
resource "alicloud_db_connection" "extranet" {
  instance_id = alicloud_db_instance.instance.id
  port  = "5432"
}

  2. 运行terraform apply。

    出现如下配置信息后，确认配置信息并输入yes，申请RDS PostgreSQL实例的外网地址。

    alicloud_db_instance.instance: Refreshing state... [id=pgm-****]

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_connection.extranet will be created
  + resource "alicloud_db_connection" "extranet" {
      + babelfish_port    = (known after apply)
      + connection_prefix = (known after apply)
      + connection_string = (known after apply)
      + id                = (known after apply)
      + instance_id       = "pgm-****"
      + ip_address        = (known after apply)
      + port              = "5432"
    }

Plan: 1 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:

    出现类似如下日志时，表示申请成功。

    alicloud_db_connection.extranet: Creating...
alicloud_db_connection.extranet: Still creating... [10s elapsed]
alicloud_db_connection.extranet: Creation complete after 11s [id=pgm-****:pgm-****]

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.

  3. 查看结果。

    • 运行terraform show查看RDS PostgreSQL实例外网地址。

      # alicloud_db_connection.extranet:
resource "alicloud_db_connection" "extranet" {
    connection_prefix = "pgm-****"
    connection_string = "pgm-****.pg.rds.aliyuncs.com"
    id                = "pgm-****:pgm-****"
    instance_id       = "pgm-****"
    ip_address        = "47.118.XX.XX"
    port              = "5432"
}

# alicloud_db_instance.instance:
resource "alicloud_db_instance" "instance" {
    client_ca_enabled          = 0
    client_crl_enabled         = 0
    connection_string          = "pgm-****.pg.rds.aliyuncs.com"
    connection_string_prefix   = "pgm-****"
    db_instance_storage_type   = "cloud_essd"
    db_time_zone               = "Asia/Shanghai"
    deletion_protection        = false
    engine                     = "PostgreSQL"
    engine_version             = "13.0"
    force_restart              = false
    ha_config                  = "Auto"
    id                         = "pgm-****"
    instance_charge_type       = "Postpaid"
    instance_name              = "terraformtest"
    instance_storage           = 50
    instance_type              = "pg.n2.2c.2m"
    maintain_time              = "05:00Z-06:00Z"
    monitoring_period          = 300
    period                     = 0
    port                       = "5432"
    private_ip_address         = "172.16.XX.XX"
    resource_group_id          = "rg-****"
    security_group_ids         = []
    security_ip_mode           = "normal"
    security_ips               = [
        "127.0.0.1",
    ]
    sql_collector_config_value = 30
    sql_collector_status       = "Disabled"
    storage_auto_scale         = "Enable"
    storage_threshold          = 30
    storage_upper_bound        = 100
    target_minor_version       = "rds_postgres_1300_20220830"
    tcp_connection_type        = "SHORT"
    vpc_id                     = "vpc-****"
    vswitch_id                 = "vsw-"
    zone_id                    = "cn-hangzhou-h"

    pg_hba_conf {
        address     = "127.0.0.1"
        database    = "all"
        method      = "md5"
        priority_id = 1
        type        = "host"
        user        = "all"
    }
}

    • 登录RDS控制台查看RDS PostgreSQL实例的外网连接地址。外网地址

修改外网地址

以修改RDS PostgreSQL实例外网地址的前缀改为pgtest为例。

  1. 在terraform.tf文件的resource "alicloud_db_connection" "extranet" {}中增加connection_prefix配置项，具体配置如下：

    ...
resource "alicloud_db_connection" "extranet" {
...
  connection_prefix = "pgtest"
}

  2. 运行terraform apply。

    出现如下配置信息后，确认配置信息并输入yes，修改RDS PostgreSQL实例的外网地址。

    alicloud_db_instance.instance: Refreshing state... [id=pgm-****]
alicloud_db_connection.extranet: Refreshing state... [id=pgm-****:pgm-bp143e6726f28lnatf]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the
following symbols:
-/+ destroy and then create replacement

Terraform will perform the following actions:

  # alicloud_db_connection.extranet must be replaced
-/+ resource "alicloud_db_connection" "extranet" {
      + babelfish_port    = (known after apply)
      ~ connection_prefix = "pgm-****" -> "pgtest" # forces replacement
      ~ connection_string = "pgm-****.pg.rds.aliyuncs.com" -> (known after apply)
      ~ id                = "pgm-****:pgm-****" -> (known after apply)
      ~ ip_address        = "47.118.XX.XX" -> (known after apply)
        # (2 unchanged attributes hidden)
    }

Plan: 1 to add, 0 to change, 1 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:

    出现类似如下日志时，表示修改成功。

    alicloud_db_connection.extranet: Destroying... [id=pgm-****:pgm-****]
alicloud_db_connection.extranet: Destruction complete after 1s
alicloud_db_connection.extranet: Creating...
alicloud_db_connection.extranet: Still creating... [10s elapsed]
alicloud_db_connection.extranet: Creation complete after 15s [id=pgm-****:pgtest]

Apply complete! Resources: 1 added, 0 changed, 1 destroyed.

  3. 查看结果。

    • 运行terraform show查看RDS PostgreSQL实例外网地址。

      # alicloud_db_connection.extranet:
resource "alicloud_db_connection" "extranet" {
    connection_prefix = "pgtest"
    connection_string = "pgtest.pg.rds.aliyuncs.com"
    id                = "pgm-****:pgtest"
    instance_id       = "pgm-****"
    ip_address        = "47.118.XX.XX"
    port              = "5432"
}

# alicloud_db_instance.instance:
resource "alicloud_db_instance" "instance" {
    client_ca_enabled          = 0
    client_crl_enabled         = 0
    connection_string          = "pgm-****.pg.rds.aliyuncs.com"
    connection_string_prefix   = "pgm-****"
    db_instance_storage_type   = "cloud_essd"
    db_time_zone               = "Asia/Shanghai"
    deletion_protection        = false
    engine                     = "PostgreSQL"
    engine_version             = "13.0"
    force_restart              = false
    ha_config                  = "Auto"
    id                         = "pgm-****"
    instance_charge_type       = "Postpaid"
    instance_name              = "terraformtest"
    instance_storage           = 50
    instance_type              = "pg.n2.2c.2m"
    maintain_time              = "05:00Z-06:00Z"
    monitoring_period          = 300
    period                     = 0
    port                       = "5432"
    private_ip_address         = "172.16.XX.XX"
    resource_group_id          = "rg-****"
    security_group_ids         = []
    security_ip_mode           = "normal"
    security_ips               = [
        "127.0.0.1",
    ]
    sql_collector_config_value = 30
    sql_collector_status       = "Disabled"
    storage_auto_scale         = "Enable"
    storage_threshold          = 30
    storage_upper_bound        = 100
    target_minor_version       = "rds_postgres_1300_20220830"
    tcp_connection_type        = "SHORT"
    vpc_id                     = "vpc-****"
    vswitch_id                 = "vsw-****"
    zone_id                    = "cn-hangzhou-h"

    pg_hba_conf {
        address     = "127.0.0.1"
        database    = "all"
        method      = "md5"
        priority_id = 1
        type        = "host"
        user        = "all"
    }
}

    • 登录RDS控制台查看RDS PostgreSQL实例的外网连接地址。外网连接地址改后

释放外网地址

  1. 在terraform.tf文件中，删除resource "alicloud_db_connection" "extranet" {}配置项的内容，例如，删除如下信息：

    ...
resource "alicloud_db_connection" "extranet" {
  instance_id = alicloud_db_instance.instance.id
  port  = "5432"
  connection_prefix = "pgtest"
}

  2. 运行terraform apply。

    出现如下配置信息后，确认配置信息并输入yes，开始释放RDS PostgreSQL实例的外网地址。

    alicloud_db_connection.extranet: Refreshing state... [id=pgm-****:pgtest]
alicloud_db_instance.instance: Refreshing state... [id=pgm-****]

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

Terraform will perform the following actions:

  # alicloud_db_connection.extranet will be destroyed
  # (because alicloud_db_connection.extranet is not in configuration)
  - resource "alicloud_db_connection" "extranet" {
      - connection_prefix = "pgtest" -> null
      - connection_string = "pgtest.pg.rds.aliyuncs.com" -> null
      - id                = "pgm-****:pgtest" -> null
      - instance_id       = "pgm-****" -> null
      - ip_address        = "47.118.XX.XX" -> null
      - port              = "5432" -> null
    }

Plan: 0 to add, 0 to change, 1 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:

    出现类似如下日志时，表示释放外网地址成功。

    alicloud_db_connection.extranet: Destroying... [id=pgm-****:pgtest]
alicloud_db_connection.extranet: Destruction complete after 1s

Apply complete! Resources: 0 added, 0 changed, 1 destroyed.

  3. 查看结果。

    • 运行terraform show查看RDS PostgreSQL实例外网地址。

      # alicloud_db_instance.instance:
resource "alicloud_db_instance" "instance" {
    client_ca_enabled          = 0
    client_crl_enabled         = 0
    connection_string          = "pgm-****.pg.rds.aliyuncs.com"
    connection_string_prefix   = "pgm-****"
    db_instance_storage_type   = "cloud_essd"
    db_time_zone               = "Asia/Shanghai"
    deletion_protection        = false
    engine                     = "PostgreSQL"
    engine_version             = "13.0"
    force_restart              = false
    ha_config                  = "Auto"
    id                         = "pgm-****"
    instance_charge_type       = "Postpaid"
    instance_name              = "terraformtest"
    instance_storage           = 50
    instance_type              = "pg.n2.2c.2m"
    maintain_time              = "05:00Z-06:00Z"
    monitoring_period          = 300
    period                     = 0
    port                       = "5432"
    private_ip_address         = "172.16.XX.XX"
    resource_group_id          = "rg-****"
    security_group_ids         = []
    security_ip_mode           = "normal"
    security_ips               = [
        "127.0.0.1",
    ]
    sql_collector_config_value = 30
    sql_collector_status       = "Disabled"
    storage_auto_scale         = "Enable"
    storage_threshold          = 30
    storage_upper_bound        = 100
    target_minor_version       = "rds_postgres_1300_20220830"
    tcp_connection_type        = "SHORT"
    vpc_id                     = "vpc-****"
    vswitch_id                 = "vsw-****"
    zone_id                    = "cn-hangzhou-h"

    pg_hba_conf {
        address     = "127.0.0.1"
        database    = "all"
        method      = "md5"
        priority_id = 1
        type        = "host"
        user        = "all"
    }
}

    • 登录RDS控制台查看RDS PostgreSQL实例的外网连接地址已释放。已释放外网地址

查询交换机详情

  1. 在terraform.tf文件中增加data "alicloud_vswitches" "instance" {}配置项，具体配置如下：

    ...
data "alicloud_vswitches" "instance" {
  vpc_id            = alicloud_vpc.main.id
}

  2. 运行terraform apply查询RDS PostgreSQL实例的交换机详情。

    出现类似如下日志时，表示查询成功。

    data.alicloud_vswitches.instance: Reading...
alicloud_db_instance.instance: Refreshing state... [id=pgm-****]
data.alicloud_vswitches.instance: Read complete after 1s [id=44344****]

No changes. Your infrastructure matches the configuration.

Terraform has compared your real infrastructure against your configuration and found no differences, so no changes are
needed.

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

  3. 运行terraform show查看结果。

    # data.alicloud_vswitches.instance:
data "alicloud_vswitches" "instance" {
    id        = "246547****"
    ids       = [
        "vsw-****",
        "vsw-****",
    ]
    names     = [
        "test",
        "",
    ]
    vpc_id    = "vpc-****"
    vswitches = [
        {
            available_ip_address_count = 252
            cidr_block                 = "10.1.0.0/24"
            creation_time              = "2022-09-13T01:57:56Z"
            description                = ""
            id                         = "vsw-****"
            is_default                 = false
            name                       = "test"
            resource_group_id          = "rg-****"
            route_table_id             = "vtb-****"
            status                     = "Available"
            tags                       = {}
            vpc_id                     = "vpc-****"
            vswitch_id                 = "vsw-****"
            vswitch_name               = "test"
            zone_id                    = "cn-hangzhou-b"
        },
        {
            available_ip_address_count = 237
            cidr_block                 = "10.2.0.0/24"
            creation_time              = "2022-09-07T06:18:47Z"
            description                = ""
            id                         = "vsw-****"
            is_default                 = false
            name                       = ""
            resource_group_id          = "rg-****"
            route_table_id             = "vtb-****"
            status                     = "Available"
            tags                       = {}
            vpc_id                     = "vpc-****"
            vswitch_id                 = "vsw-****"
            vswitch_name               = ""
            zone_id                    = "cn-hangzhou-b"
        },
    ]
}

切换交换机

以切换交换机切换为vsw-****为例。

重要

切换交换机的操作会删除原有RDS PostgreSQL实例，创建新的RDS PostgreSQL实例，实例内数据将不会继承，请谨慎操作。

  1. 修改terraform.tf文件中resource "alicloud_db_instance" "instance" {}的配置项vswitch_id，具体配置如下：

    ...
resource "alicloud_db_instance" "instance" {
...
  vswitch_id       = "vsw-****"
}

  2. 运行terraform apply。

    出现如下配置信息后，确认配置信息并输入yes，开始切换交换机。

    alicloud_db_instance.instance: Refreshing state... [id=pgm-****]

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the
following symbols:
-/+ destroy and then create replacement

Terraform will perform the following actions:

  # alicloud_db_instance.instance must be replaced
-/+ 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)
      - client_ca_enabled          = 0 -> null
      - client_crl_enabled         = 0 -> null
      ~ connection_string          = "pgm-****.pg.rds.aliyuncs.com" -> (known after apply)
      ~ connection_string_prefix   = "pgm-****" -> (known after apply)
      ~ db_instance_storage_type   = "cloud_essd" -> (known after apply)
      + db_is_ignore_case          = (known after apply)
      ~ db_time_zone               = "Asia/Shanghai" -> (known after apply)
      ~ ha_config                  = "Auto" -> (known after apply)
      ~ id                         = "pgm-****" -> (known after apply)
      ~ monitoring_period          = 300 -> (known after apply)
      - period                     = 0 -> null
      ~ port                       = "5432" -> (known after apply)
      ~ private_ip_address         = "172.16.XX.XX" -> (known after apply)
      + replication_acl            = (known after apply)
      + security_group_id          = (known after apply)
      ~ security_group_ids         = [] -> (known after apply)
      ~ security_ips               = [
          - "127.0.0.1",
        ] -> (known after apply)
      + server_cert                = (known after apply)
      + server_key                 = (known after apply)
      ~ sql_collector_status       = "Disabled" -> (known after apply)
      + ssl_action                 = (known after apply)
      + ssl_status                 = (known after apply)
      ~ target_minor_version       = "rds_postgres_1300_20220830" -> (known after apply)
      ~ vpc_id                     = "vpc-****" -> (known after apply)
      ~ vswitch_id                 = "vsw-****" -> "vsw-****" # forces replacement
      ~ zone_id                    = "cn-hangzhou-h" -> (known after apply)
      + zone_id_slave_a            = (known after apply)
        # (16 unchanged attributes hidden)

      + babelfish_config {
          + babelfish_enabled    = (known after apply)
          + master_user_password = (known after apply)
          + master_username      = (known after apply)
          + migration_mode       = (known after apply)
        }

      + parameters {
          + name  = (known after apply)
          + value = (known after apply)
        }

        # (1 unchanged block hidden)
    }

Plan: 1 to add, 0 to change, 1 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:

    出现类似如下日志时，表示切换成功。

    alicloud_db_instance.instance: Destroying... [id=pgm-****]
alicloud_db_instance.instance: Still destroying... [id=pgm-****, 10s elapsed]
alicloud_db_instance.instance: Still destroying... [id=pgm-****, 20s elapsed]
alicloud_db_instance.instance: Still destroying... [id=pgm-****, 30s elapsed]
alicloud_db_instance.instance: Destruction complete after 31s
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... [10m58s elapsed]
alicloud_db_instance.instance: Creation complete after 11m1s [id=pgm-****]

Apply complete! Resources: 1 added, 0 changed, 1 destroyed.

  3. 查看结果。

    • 运行terraform show查看RDS PostgreSQL实例交换机信息。

      # alicloud_db_instance.instance:
resource "alicloud_db_instance" "instance" {
    client_ca_enabled          = 0
    client_crl_enabled         = 0
    connection_string          = "pgm-****.pg.rds.aliyuncs.com"
    connection_string_prefix   = "pgm-****"
    db_instance_storage_type   = "cloud_essd"
    db_time_zone               = "Asia/Shanghai"
    deletion_protection        = false
    engine                     = "PostgreSQL"
    engine_version             = "13.0"
    force_restart              = false
    ha_config                  = "Auto"
    id                         = "pgm-****"
    instance_charge_type       = "Postpaid"
    instance_name              = "terraformtest"
    instance_storage           = 50
    instance_type              = "pg.n2.2c.2m"
    maintain_time              = "05:00Z-06:00Z"
    monitoring_period          = 300
    period                     = 0
    port                       = "5432"
    private_ip_address         = "192.168.XX.XX"
    resource_group_id          = "rg-****"
    security_group_ids         = []
    security_ip_mode           = "normal"
    security_ips               = [
        "127.0.0.1",
    ]
    sql_collector_config_value = 30
    sql_collector_status       = "Disabled"
    storage_auto_scale         = "Enable"
    storage_threshold          = 30
    storage_upper_bound        = 100
    target_minor_version       = "rds_postgres_1300_20220830"
    tcp_connection_type        = "SHORT"
    vpc_id                     = "vpc-****"
    vswitch_id                 = "vsw-****"
    zone_id                    = "cn-hangzhou-h"

    pg_hba_conf {
        address     = "127.0.0.1"
        database    = "all"
        method      = "md5"
        priority_id = 1
        type        = "host"
        user        = "all"
    }
}

    • 登录RDS控制台查看RDS PostgreSQL实例的交换机信息。交换机新

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