Cloudformation 堆栈模板条件

Question

如何创建带有条件子句的 Cloudformation 模板以创建 10 个实例作为参数。

我已将以下示例用于最多 5 个实例。但是我怎样才能使用它超过 5 个呢？这取决于我们如何创建条件子句。

Conditions:
  Launch1: !Equals [1, 1]
  Launch2: !Not [!Equals [1, !Ref InstanceCount]]
  Launch3: !Or
  - !Not [!Equals [1, !Ref InstanceCount]]
  - !Not [!Equals [2, !Ref InstanceCount]]
  Launch4: !Or
  - !Equals [4, !Ref InstanceCount]
  - !Equals [5, !Ref InstanceCount]
  Launch5: !Equals [5, !Ref InstanceCount]

你能帮我把这个例子扩大到 10 个实例吗？

Answer 1

我高度建议您依赖 AutoScaling 组 (AWS::AutoScaling::AutoScalingGroup)。这样您就可以使用DesiredCapacity 属性引用实例计数。这样做你也会有很多其他好处。

编辑：但如果你仍然想使用条件来做，这就是你需要做的：

AWSTemplateFormatVersion: "2010-09-09"
Parameters:
  InstanceCount:
    Type: Number

Conditions:
  Launch10: !Equals [10, !Ref InstanceCount]
  Launch9: !Or
  - !Equals [9, !Ref InstanceCount]
  - !Condition Launch10
  Launch8: !Or
  - !Equals [8, !Ref InstanceCount]
  - !Condition Launch9
  Launch7: !Or
  - !Equals [7, !Ref InstanceCount]
  - !Condition Launch8
  Launch6: !Or
  - !Equals [6, !Ref InstanceCount]
  - !Condition Launch7
  Launch5: !Or
  - !Equals [5, !Ref InstanceCount]
  - !Condition Launch6
  Launch4: !Or
  - !Equals [4, !Ref InstanceCount]
  - !Condition Launch5
  Launch3: !Or
  - !Equals [3, !Ref InstanceCount]
  - !Condition Launch4
  Launch2: !Or
  - !Equals [2, !Ref InstanceCount]
  - !Condition Launch3
  Launch1: !Or
  - !Equals [1, !Ref InstanceCount]
  - !Condition Launch2

Resources:
  Bucket1:
    Condition: Launch1
    Type: AWS::S3::Bucket

  Bucket2:
    Condition: Launch2
    Type: AWS::S3::Bucket

  Bucket3:
    Condition: Launch3
    Type: AWS::S3::Bucket

  Bucket4:
    Condition: Launch4
    Type: AWS::S3::Bucket

  Bucket5:
    Condition: Launch5
    Type: AWS::S3::Bucket

  Bucket6:
    Condition: Launch6
    Type: AWS::S3::Bucket

  Bucket7:
    Condition: Launch7
    Type: AWS::S3::Bucket

  Bucket8:
    Condition: Launch8
    Type: AWS::S3::Bucket

  Bucket9:
    Condition: Launch9
    Type: AWS::S3::Bucket

  Bucket10:
    Condition: Launch10
    Type: AWS::S3::Bucket

我用过bucket，所以测试起来会更快