If you have an AWS API Gateway resource, and need it to force a redeployment using CloudFormation, then you can use the TIMESTAMP trick.
Example AWS CloudFormation Extract
template.yaml extract:
APIGatewayStage:
Type: AWS::ApiGateway::Stage
Properties:
StageName: !Sub ${EnvironmentTagName}
RestApiId: !Ref APIGateway
DeploymentId: !Ref APIGatewayDeployment__TIMESTAMP__
TracingEnabled: true
MethodSettings:
- DataTraceEnabled: true
HttpMethod: "*"
LoggingLevel: INFO
ResourcePath: "/*"
MetricsEnabled: true
APIGatewayDeployment__TIMESTAMP__:
Type: AWS::ApiGateway::Deployment
Properties:
RestApiId: !Ref APIGateway
Description: !Sub ${EnvironmentTagName} Deployment __TIMESTAMP__
APIGateway:
Type: AWS::ApiGateway::RestApi
Properties:
Name: !Ref "AWS::StackName"
...
As we can see, on line 15 above, we use the __TIMESTAMP__ string in the APIGatewayDeployment stage.
Example CI/CD Bash Extract
Now we simply make sure to update the template.yaml file with our CI run, replacing the occurence of __TIMESTAMP__ with the TIMESTAMP variable generated:
TIMESTAMP="$(date +%s)"
sed -i "s/__TIMESTAMP__/${TIMESTAMP}/g" template.yaml