I have a Lambda function deployed to several regions. I would like to publish a message to SNS that will invoke these functions.
Using aws-cli I've created the topics, given Lambda permission to talk to SNS, and create the subscriptions. The subscription appears to be created successfully, and I can see it in the AWS console. But, it doesn't work. The lambda function does not get invoked.
This is CloudFormation
based example. You have to add invoke permission for SNS
to the Lambda
functions:
{
"Type" : "AWS::Lambda::Permission",
"Properties" : {
"FunctionName" : { "Fn::GetAtt" : [ "YourLambda", "Arn" ] },
"Action" : "lambda:InvokeFunction",
"Principal" : "sns.amazonaws.com",
"SourceArn" : { "Ref" : "YourSNSTopicArn" }
}
}
Then you need to subscribe your Lambdas
to your SNS
topic. This can be done via API call or through CloudFormation
.
{
"Type" : "AWS::SNS::Topic",
"Properties" : {
"TopicName" : "YourTopicName",
"Subscription" : [ {
"Endpoint" : { "Fn::GetAtt" : [ "YourLambda", "Arn" ] },
"Protocol": "lambda"
} ]
}
}
If you're missing any of this, your Lambdas
won't invoke. Source for the above information is the official blog article Invoking Lambda functions via SNS .
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