AWS - Deploy Function

The sls deploy function command deploys an individual function without AWS CloudFormation. This command simply swaps out the zip file that your CloudFormation stack is pointing toward. This is a much faster way of deploying changes in code.

serverless deploy function -f functionName

Note: Because this command is only deploying the function code, function properties such as environment variables and events will not be deployed. Those properties are deployed via CloudFormation, which does not execute with this command.

Options

--function or -f The name of the function which should be deployed
--stage or -s The stage in your service that you want to deploy to.
--region or -r The region in that stage that you want to deploy to.
--update-config or -u Pushes Lambda-level configuration changes e.g. timeout or memorySize

Examples

Deployment without stage and region options

serverless deploy function --function helloWorld

Deployment with stage and region options

serverless deploy function --function helloWorld --stage dev --region us-east-1

Deployment with configuration change

serverless deploy function --function helloWorld --update-config

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Read this on the main serverless docs site