Amazon CloudFormation 是否为将 RDS 实例部署到多可用区配置中的不同环境做好了准备？
Does Amazon CloudFormation make provision for deploying RDS instances to different environments in a Multi-AZ configuration?
我正在尝试使用 CloudFormation 模板在不同环境中创建 Amazon RDS 实例。 Prod中有Multi-AZ需求，其他环境则不需要Multi-AZ。这需要 CloudFormation 中的条件函数。
基于 RDS CloudFormation docs and using the if condition in CloudFormation，模板中应包含以下内容：
Conditions:
IsProd: !Equals [ !Ref EnvironmentType, prod ]
...
Resources:
MyRDSInstance:
Properties:
...
AvailabilityZone:
!If [ IsProd, AWS::NoValue, af-south-1a ]
...
MultiAZ: !If [ IsProd, true, false ]
当 IsProd 计算为：
- 错误，
AvailabilityZone: af-south-1a 和 MultiAZ: false
- 正确，
AvailabilityZone is removed and MultiAZ: true, which meets the requirement specified in the docs：
You can't set the AvailabilityZone parameter if the MultiAZ parameter is set to true.
但是，当我尝试部署 prod RDS 实例时，我在创建堆栈时在 CloudFormation 中仍然遇到以下错误，这导致资源无法创建：
Requesting a specific availability zone is not valid for Multi-AZ instances. (Service: AmazonRDS; Status Code: 400; Error Code: InvalidParameterCombination; Request ID: e6177fe4-4a4b-4db3-ba66-5f0e0f7218eb; Proxy: null)
我怀疑这是 AWS 中的一个错误，因为最近对源代码进行了更改，即使它与 CDK 相关而不是 CloudFormation：
- 问题：Availability Zone parameter silently removed from stack when MultiAZ is true
- 2021 年 5 月 25 日提交的修复：修复（rds）：Add exception throw when az is defined for multi-az db inst…。我在这个确切的修复中遇到了错误。
会不会是 CloudFormation 现在没有提供 AWS::NoValue 伪参数？如果这是源代码中的错误，是否有任何方法可以解决这个问题，以便我仍然可以仅在 prod 环境中实现多可用区？
所以我尝试在我这边复制相同的内容，但就我而言，我能够成功创建 RDS 资源。我附上我使用的模板供您参考。
AWSTemplateFormatVersion: 2010-09-09
Description: >-
Description": "AWS CloudFormation Sample Template for creating an Amazon RDS DB instance:
Sample template showing how to create a DB instance with Enhanced Monitoring enabled.
**WARNING** This template creates an RDS DB instance. You will be billed for the AWS
resources used if you create a stack from this template.
Parameters:
IsMultiAZ:
Type: String
Default: false
AllowedValues: [true,false]
Description: Please enter either "true" or "false"
DBInstanceID:
Default: mydbinstance
Description: My database instance
Type: String
MinLength: '1'
MaxLength: '63'
AllowedPattern: '[a-zA-Z][a-zA-Z0-9]*'
ConstraintDescription: >-
Must begin with a letter and must not end with a hyphen or contain two
consecutive hyphens.
DBName:
Default: mydb
Description: My database
Type: String
MinLength: '1'
MaxLength: '64'
AllowedPattern: '[a-zA-Z][a-zA-Z0-9]*'
ConstraintDescription: Must begin with a letter and contain only alphanumeric characters.
DBInstanceClass:
Default: db.m5.large
Description: DB instance class
Type: String
ConstraintDescription: Must select a valid DB instance type.
DBAllocatedStorage:
Default: '50'
Description: The size of the database (GiB)
Type: Number
MinValue: '20'
MaxValue: '65536'
ConstraintDescription: must be between 20 and 65536 GiB.
DBUsername:
NoEcho: 'true'
Description: Username for MySQL database access
Type: String
MinLength: '1'
MaxLength: '16'
AllowedPattern: '[a-zA-Z][a-zA-Z0-9]*'
ConstraintDescription: must begin with a letter and contain only alphanumeric characters.
DBPassword:
NoEcho: 'true'
Description: Password MySQL database access
Type: String
MinLength: '8'
MaxLength: '41'
AllowedPattern: '[a-zA-Z0-9]*'
ConstraintDescription: must contain only alphanumeric characters.
Conditions:
CheckIsMultiZone:
!Equals [!Ref IsMultiAZ, true]
Resources:
MyDB:
Type: 'AWS::RDS::DBInstance'
Properties:
DBInstanceIdentifier: !Ref DBInstanceID
DBName: !Ref DBName
DBInstanceClass: !Ref DBInstanceClass
AllocatedStorage: !Ref DBAllocatedStorage
Engine: MySQL
EngineVersion: "8.0.16"
MasterUsername: !Ref DBUsername
MasterUserPassword: !Ref DBPassword
MultiAZ: !Ref IsMultiAZ
AvailabilityZone: !If [CheckIsMultiZone, !Ref AWS::NoValue, "us-east-1a"]
如您所见，我使用了与您相同的概念。您能否在最后测试此模板，看看它是否有效。我在您的模板中发现的一个问题是您使用的是 AWS::NoValue，而正确的格式是 !Ref AWS::NoValue，如我的模板所示。我相信这是你的问题。您可以查看示例 here .
我正在尝试使用 CloudFormation 模板在不同环境中创建 Amazon RDS 实例。 Prod中有Multi-AZ需求，其他环境则不需要Multi-AZ。这需要 CloudFormation 中的条件函数。
基于 RDS CloudFormation docs and using the if condition in CloudFormation，模板中应包含以下内容：
Conditions:
IsProd: !Equals [ !Ref EnvironmentType, prod ]
...
Resources:
MyRDSInstance:
Properties:
...
AvailabilityZone:
!If [ IsProd, AWS::NoValue, af-south-1a ]
...
MultiAZ: !If [ IsProd, true, false ]
当 IsProd 计算为：
- 错误，
AvailabilityZone: af-south-1a和MultiAZ: false - 正确，
AvailabilityZoneis removed andMultiAZ: true, which meets the requirement specified in the docs：
You can't set the AvailabilityZone parameter if the MultiAZ parameter is set to true.
但是，当我尝试部署 prod RDS 实例时，我在创建堆栈时在 CloudFormation 中仍然遇到以下错误，这导致资源无法创建：
Requesting a specific availability zone is not valid for Multi-AZ instances. (Service: AmazonRDS; Status Code: 400; Error Code: InvalidParameterCombination; Request ID: e6177fe4-4a4b-4db3-ba66-5f0e0f7218eb; Proxy: null)
我怀疑这是 AWS 中的一个错误，因为最近对源代码进行了更改，即使它与 CDK 相关而不是 CloudFormation：
- 问题：Availability Zone parameter silently removed from stack when MultiAZ is true
- 2021 年 5 月 25 日提交的修复：修复（rds）：Add exception throw when az is defined for multi-az db inst…。我在这个确切的修复中遇到了错误。
会不会是 CloudFormation 现在没有提供 AWS::NoValue 伪参数？如果这是源代码中的错误，是否有任何方法可以解决这个问题，以便我仍然可以仅在 prod 环境中实现多可用区？
所以我尝试在我这边复制相同的内容，但就我而言，我能够成功创建 RDS 资源。我附上我使用的模板供您参考。
AWSTemplateFormatVersion: 2010-09-09
Description: >-
Description": "AWS CloudFormation Sample Template for creating an Amazon RDS DB instance:
Sample template showing how to create a DB instance with Enhanced Monitoring enabled.
**WARNING** This template creates an RDS DB instance. You will be billed for the AWS
resources used if you create a stack from this template.
Parameters:
IsMultiAZ:
Type: String
Default: false
AllowedValues: [true,false]
Description: Please enter either "true" or "false"
DBInstanceID:
Default: mydbinstance
Description: My database instance
Type: String
MinLength: '1'
MaxLength: '63'
AllowedPattern: '[a-zA-Z][a-zA-Z0-9]*'
ConstraintDescription: >-
Must begin with a letter and must not end with a hyphen or contain two
consecutive hyphens.
DBName:
Default: mydb
Description: My database
Type: String
MinLength: '1'
MaxLength: '64'
AllowedPattern: '[a-zA-Z][a-zA-Z0-9]*'
ConstraintDescription: Must begin with a letter and contain only alphanumeric characters.
DBInstanceClass:
Default: db.m5.large
Description: DB instance class
Type: String
ConstraintDescription: Must select a valid DB instance type.
DBAllocatedStorage:
Default: '50'
Description: The size of the database (GiB)
Type: Number
MinValue: '20'
MaxValue: '65536'
ConstraintDescription: must be between 20 and 65536 GiB.
DBUsername:
NoEcho: 'true'
Description: Username for MySQL database access
Type: String
MinLength: '1'
MaxLength: '16'
AllowedPattern: '[a-zA-Z][a-zA-Z0-9]*'
ConstraintDescription: must begin with a letter and contain only alphanumeric characters.
DBPassword:
NoEcho: 'true'
Description: Password MySQL database access
Type: String
MinLength: '8'
MaxLength: '41'
AllowedPattern: '[a-zA-Z0-9]*'
ConstraintDescription: must contain only alphanumeric characters.
Conditions:
CheckIsMultiZone:
!Equals [!Ref IsMultiAZ, true]
Resources:
MyDB:
Type: 'AWS::RDS::DBInstance'
Properties:
DBInstanceIdentifier: !Ref DBInstanceID
DBName: !Ref DBName
DBInstanceClass: !Ref DBInstanceClass
AllocatedStorage: !Ref DBAllocatedStorage
Engine: MySQL
EngineVersion: "8.0.16"
MasterUsername: !Ref DBUsername
MasterUserPassword: !Ref DBPassword
MultiAZ: !Ref IsMultiAZ
AvailabilityZone: !If [CheckIsMultiZone, !Ref AWS::NoValue, "us-east-1a"]
如您所见，我使用了与您相同的概念。您能否在最后测试此模板，看看它是否有效。我在您的模板中发现的一个问题是您使用的是 AWS::NoValue，而正确的格式是 !Ref AWS::NoValue，如我的模板所示。我相信这是你的问题。您可以查看示例 here .