AWS Cloudformation : Passing environmental variables as parameters to lambda functions

Question

I am creating a cloud formation for lambda . I want to have a generic lambda script that created lambda . I am having problem injecting "Environment" parameter from outside .

I want to pass the key value pair object as parameter . Can some one tell me how to do it . I have highlighted it below

{ "Variables" : **{ String:String, ... }** } { "Type" : "AWS::Lambda::Function", "Properties" : { "Code" : Code, "DeadLetterConfig" : DeadLetterConfig, "Description" : String, "Environment" : Environment, "FunctionName" : String, "Handler" : String, "KmsKeyArn" : String, "MemorySize" : Integer, "ReservedConcurrentExecutions" : Integer, "Role" : String, "Runtime" : String, "Timeout" : Integer, "TracingConfig" : TracingConfig, "VpcConfig" : VPCConfig, "Tags" : [ Resource Tag, ... ] } }

Which is the highlighted portion? Where have you declared your external environment variable? — asr9
– asr9, Commented Jul 22, 2018 at 1:35

Oleksii Balenko · Accepted Answer · 2018-07-24 09:23:28Z

For this purpose there is special section in cloudformation template - Parameters

"Parameters" : { "MyVariable" : { "Type" : "String", "Default" : "test", "AllowedValues" : ["test", "non-test"], "Description" : "My very important variable." } }

And then use these parameters in Function declaration:

"Environment":{ "Variables":{ "SomeVariable":{ "Ref":"MyVariable" } } }

And then pass values for this Parameters block when creating stack from cloudformation template:

aws cloudformation create-stack --stack-name S1 --template-body example template --parameters ParameterKey=MyVariable,ParameterValue=myValue

More information - here

TheUnderdogr · Accepted Answer · 2019-11-29 19:39:56Z

"I want to pass the key value pair object as parameter"
You cannot pass key-value pairs as parameters in AWS CF templates. For the accepted parameter types please see this

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