Creating Functions on CLI

Last updated: 2020-07-21 17:52:41

    Operation Scenarios

    This document describes how to use the SCF component provided by Serverless Framework to quickly create and deploy an SCF project. To learn more about components and how to use them, please see Components Overview.


    SCF CLI has been disused since February 2020. We recommend you use the more rich-featured and convenient Serverless Framework CLI for project development.


    Installing Serverless Framework

    On the command line, run the following command to install the latest version of Serverless Framework through npm.

    npm install -g serverless

    Creating function directory

    1. Run the following command to create a directory and enter it (this document uses tencent-scf as an example):
      mkdir tencent-scf && cd tencent-scf
    2. Run the following commands in sequence to quickly create an SCF application:
      serverless create --template-url
      cd example
      After the application is created successfully, its directory structure is as follows
      |- src
      |   └── index.js
      └──  serverless.yml

    Deploying function

    1. In the directory where serverless.yml is located, run the following command to deploy the function:
      serverless deploy
    2. If you want to configure persistent environment variables or key information, please do so as instructed in Account configuration.
      After the function is deployed successfully, you can view the URL provided by the gateway trigger of the corresponding function in the command line output and access the URL in a browser to view the function deployment result.


      If you want to view more information on the deployment process, you can run the sls deploy --debug command to view the real-time log information during the deployment process (sls is an abbreviation for the serverless command).

    Configuring deployment

    The SCF component supports "zero" configuration deployment, that is, it can be deployed directly with the default values in the configuration file. Nonetheless, you can also modify more optional configuration items as needed to further customize the project to be deployed.

    The following is the description of the SCF component configuration file serverless.yml. For more information, please see Full Configuration and Configuration Description.

    # serverless.yml
    component: scf # Name of the imported component, which is required. The `tencent-scf` component is used in this example
    name: scfdemo # Name of the instance created by this component, which is required
    org: test # Organization information, which is optional. The default value is the `appid` of your Tencent Cloud account
    app: scfApp # SCF application name, which is optional
    stage: dev # Information for identifying environment, which is optional. The default value is `dev`
      name: scfFunctionName
      src: ./src
      runtime: Nodejs10.15 # Runtime environment of function. Valid values: Python2.7, Python3.6, Nodejs6.10, Nodejs8.9, Nodejs10.15, Nodejs12.16, PHP5, PHP7, Golang1, Java8
      region: ap-guangzhou
      handler: index.main_handler
        - apigw:
            name: serverless_api
                - http
                - https
              description: The service of Serverless Framework
              environment: release
                - path: /index
                  method: GET

    After updating the fields in the configuration file, run the serverless deploy or serverless command again to update the configuration to the cloud.

    Development and debugging

    After deploying the function, you can use the development and debugging capabilities provided by the component to re-develop the project into a production-ready application.

    Development mode

    In the directory where the serverless.yml file is located, run the following command to enter the development mode:

    serverless dev

    After the local code is modified or updated, there is no need to repeatedly run the serverless deploy command for deployment again. After entering the development mode, the component can detect and automatically upload changes to the local code.
    serverless dev also supports real-time outputting of cloud logs. After each deployment, you can access the project to output invocation logs in real time on the command line, which makes it easy for you to view business conditions and troubleshoot issues.

    In-cloud debugging

    For Node.js applications, the component supports in-cloud debugging. Once in the development mode, it will automatically listen on the remote port and set the function timeout period to 900 seconds temporarily. At this point, you can find the remote debugging path by accessing chrome://inspect/#devices and directly debug the code with breakpoints. After the debugging ends, you need to deploy the function again to update the code and reset the timeout period. For more information, please see Development Mode and In-cloud Debugging.

    Viewing deployment status

    In the directory where the serverless.yml file is located, you can run the following command to check the deployment status:

    serverless info

    Removing application

    In the directory where the serverless.yml file is located, run the following command to remove the deployed SCF application. After removal, this component will delete all related resources created during deployment in the cloud.

    serverless remove


    You can run the sls remove --debug command to view real-time log information during the removal process (sls is short for the serverless command).

    Relevant Operations


    Account configuration

    Currently, you can scan a QR code to log in to the CLI by default. If you want to configure persistent environment variables/key information, you can do so in the following steps:

    1. Run the following command to create a .env file locally:
      touch .env # Tencent Cloud configuration information
    2. Configure Tencent Cloud SecretId and SecretKey information in the .env file as follows and save it:
      # .env


      • If you don't have a Tencent Cloud account yet, please sign up first.
      • If you already have a Tencent Cloud account, you can get SecretId and SecretKey in API Key Management.

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