执行Terraform Apply创建OCI实例时遭遇400-CannotParseRequest错误求助

问题描述 #

在OCI中使用Terraform创建简单实例时，执行terraform apply后始终返回模糊错误：400-CannotParseRequest。

原Terraform脚本 #

resource "oci_core_instance" "ubuntu_oci_instance" {
  availability_domain = data.oci_identity_availability_domains.ads.availability_domains.0.id
  compartment_id      = var.compartment_ocid
  fault_domain        = var.default_fault_domain

  create_vnic_details {
    assign_private_dns_record = true
    assign_public_ip          = true
    subnet_id                 = var.public_subnet_id
  }

  display_name = "Ubuntu Instance"

  shape = "VM.Standard.A1.Flex"

  shape_config {
    memory_in_gbs = "6"
    ocpus         = "1"
  }

  source_details {
    source_id   = var.os_image_id
    source_type = "image"
  }

  freeform_tags = local.tags
}

调试日志 #

2023-02-27T11:09:25.499-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: {"availabilityDomain":"ocid1.availabilitydomain.oc1..XXXXXX","compartmentId":"ocid1.subnet.oc1.sa-vinhedo-1.XXXXXX","createVnicDetails":{"assignPrivateDnsRecord":true,"assignPublicIp":true,"subnetId":"ocid1.subnet.oc1.sa-vinhedo-1.XXXXX"},"displayName":"Ubuntu Instance","faultDomain":"FAULT-DOMAIN-1","freeformTags":{"environment":"lab","oracle-tutorial":"terraform"},"shape":"VM.Standard.A1.Flex","shapeConfig":{"memoryInGBs":6,"ocpus":1},"sourceDetails":{"bootVolumeVpusPerGB":10,"imageId":"ocid1.image.oc1.sa-vinhedo-1.aaaaaaaaonxtcly7ahfdey62t2omzydh55y4rjf6qge6j2iljh4qiexuso5a","sourceType":"image"}}
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: INFO 2023/02/27 11:09:25.582061 client.go:449: Dump Response HTTP/1.1 400 Bad Request
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: Connection: close
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: Content-Length: 127
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: Content-Type: application/json
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: Date: Mon, 27 Feb 2023 14:09:25 GMT
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: Opc-Request-Id: d5960a2c88b5d6dcf2965b4afd00c6b1/3FF831DB64F0B8B8F9214282CC4BDD1D/E6CA846EBB29D2B8F9E20FD1A4A70572
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: 
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: {
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0:   "code" : "CannotParseRequest",
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0:   "message" : "Incorrectly formatted request. Please refer to our documentation for help."
2023-02-27T11:09:25.582-0300 [DEBUG] provider.terraform-provider-oci_v4.109.0: }

问题分析与修复 #

从调试日志的请求体可以发现两个关键错误：

• compartmentId值错误：请求中compartmentId填的是子网的OCID（ocid1.subnet...），但该字段必须填写compartment的OCID。检查var.compartment_ocid变量，确保其值为正确的compartment标识符。
• shape_config参数类型错误：原脚本中shape_config的memory_in_gbs和ocpus用了字符串格式（带引号），而VM.Standard.A1.Flex这类弹性实例要求这两个参数为数值类型，字符串会导致OCI服务无法解析请求。

修正后的脚本 #

resource "oci_core_instance" "ubuntu_oci_instance" {
  availability_domain = data.oci_identity_availability_domains.ads.availability_domains.0.id
  compartment_id      = var.compartment_ocid  # 确保此变量是compartment的OCID而非子网OCID
  fault_domain        = var.default_fault_domain

  create_vnic_details {
    assign_private_dns_record = true
    assign_public_ip          = true
    subnet_id                 = var.public_subnet_id
  }

  display_name = "Ubuntu Instance"

  shape = "VM.Standard.A1.Flex"

  shape_config {
    memory_in_gbs = 6  # 去掉引号，使用数值类型
    ocpus         = 1  # 去掉引号，使用数值类型
  }

  source_details {
    source_id   = var.os_image_id
    source_type = "image"
  }

  freeform_tags = local.tags
}

修复后重新执行terraform apply即可正常创建实例。

内容的提问来源于stack exchange，提问作者André Roggeri Campos