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临时关闭主备自动切换

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本文介绍如何使用Terraform临时关闭高可用RDS PostgreSQL实例的主备自动切换。

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。

操作步骤

高可用实例默认开启主备自动切换,支持通过Terraform临时关闭主备自动切换,则参考如下配置:

  1. 在terraform.tf文件的resource "alicloud_db_instance" "instance" {}中增加ha_configmanual_ha_time配置项,具体配置如下:

    ...
    resource "alicloud_db_instance" "instance" {
    ...
      ha_config = "Manual"
      manual_ha_time = "2022-09-30T09:00:00Z"
    }
                            
    说明

    控制台显示时间为北京时间,通过terraform设置时需要配置为UTC时间,UTC时间09:00对应北京时间为17:00

  2. 运行terraform apply

    出现如下配置信息后,确认配置信息并输入yes,开始修改RDS PostgreSQL实例配置。

    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:
      ~ update in-place
    
    Terraform will perform the following actions:
    
      # alicloud_db_instance.instance will be updated in-place
      ~ resource "alicloud_db_instance" "instance" {
          ~ ha_config                  = "Auto" -> "Manual"
            id                         = "pgm-****"
          + manual_ha_time             = "2022-09-30T09:00:00Z"
            # (33 unchanged attributes hidden)
    
            # (1 unchanged block hidden)
        }
    
    Plan: 0 to add, 1 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,表示配置成功。

    alicloud_db_instance.instance: Modifying... [id=pgm-****]
    alicloud_db_instance.instance: Still modifying... [id=pgm-****, 10s elapsed]
    ...
    alicloud_db_instance.instance: Still modifying... [id=pgm-****, 3m0s elapsed]
    alicloud_db_instance.instance: Modifications complete after 3m4s [id=pgm-****]
    Apply complete! Resources: 0 added, 1 changed, 0 destroyed.
  3. 查看结果。

    • 运行terraform show查看RDS PostgreSQL实例的主备自动切换状态。

      # 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                  = "Manual"
          id                         = "pgm-****"
          instance_charge_type       = "Postpaid"
          instance_name              = "terraformtest"
          instance_storage           = 50
          instance_type              = "pg.n2.2c.2m"
          maintain_time              = "05:00Z-06:00Z"
          manual_ha_time             = "2022-09-30T09:00:00Z"
          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-j"
      
          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实例的主备自动切换状态。临时关闭自动切换

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