我正在使用 CloudFormation 将 ELB 部署到具有预先存在的子网的预先存在的 VPC。我在模板的映射部分列出了子网,并根据环境参数选择了映射。如果映射是针对单个值的,则此方法可以正常工作,但我希望映射返回一个列表,因为我希望 ELB 是多可用区的。我尝试了以下示例的各种组合,但总是出现相同的错误Value of property Subnets must be of type List of String
。有没有办法让 FindInMap 返回值列表?
ELB 配置示例
"ElasticLoadBalancerAPI": {
"Properties": {
"ConnectionDrainingPolicy": {
"Enabled": true,
"Timeout": 30
},
"ConnectionSettings": {
"IdleTimeout": 60
},
"CrossZone": "false",
"Subnets" : [
{
"Fn::FindInMap": [
"AWSEnv2PublicSubnets",
{
"Ref": "Env"
},
"subList"
]
}
],
"SecurityGroups" : [ { "Ref" : "LoadBalancerSecurityGroup" }],
etc...
示例参数
"Parameters": {
"Env": {
"Description": "Environment",
"Type": "String",
"Default": "DEV",
"AllowedValues": [
"DEV",
"TEST"
]
}
}
示例映射
"Mappings": {
"AWSEnv2PublicSubnets": {
"DEV": {
"subList": ["subnet-1111","subnet-2222","subnet-3333"]
},
"TEST": {
"subList": ["subnet-4444"]
}
}
}
答案1
使用分裂函数工作原理:
JSON
"Mappings": {
"AWSEnv2PublicSubnets": {
"DEV": {
"subList": "subnet-1111,subnet-2222,subnet-3333"
}
}
}
然后:
"Subnets" : {
"Fn::Split" : [
",",
{ "Fn::FindInMap": [
"AWSEnv2PublicSubnets",
{ "Ref": "Env" },
"subList"
] }
]
}
YAML
Mappings:
AWSEnv2PublicSubnets:
DEV:
subList: subnet-1111,subnet-2222,subnet-3333
然后:
Subnets: !Split [",", !FindInMap [ AWSEnv2PublicSubnets, !Ref Env, subList] ]
我使用逗号 ( ,
) 作为分隔符,但您可以使用任何您想要的字符,只要它不用作值的一部分。
答案2
我认为映射值支持List
类型(至少截至目前)。
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/mappings-section-structure.html
Mappings 部分由键名 Mappings 组成。mappings 中的键必须是文字字符串。值可以是
String
或List
类型。
这是用 YAML 编写的示例。
Parameters:
Env:
Type: String
AllowedValues: [dev, qa, prod]
Mappings:
Environment:
dev:
Groups:
- Developer
- QA
qa:
Groups:
- Developer
- QA
prod:
Groups:
- Operations
Resources:
Policy:
Type: AWS::IAM::ManagedPolicy
Properties:
ManagedPolicyName: iam-manage-role
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action:
- iam:*Role*
Resource: "*"
Groups: !FindInMap [Environment, !Ref Env, Groups]