Function Compute:Create a web function

Create a function

1. Log on to the Function Compute console. In the navigation pane on the left, choose Function Management > Function List.

2. In the top menu bar, select a region. On the Function List page, click Create Function.

3. In the dialog box that appears, select the Web Function type and click Create Web Function.

4. On the Create Web Function page, set the following configuration items, and then click Create.

   • Basic Configurations: Set the function specifications and instance information.

     Configuration Item	Description	Example
     Function Name	A unique symbol to identify the function. The function name must be unique within the same account and region and comply with naming conventions.	myFunction
     Specification Plan	Set the vCPU, Memory, and Disk specifications for the function based on your business needs. After you set the specifications, the usage of each resource is billed based on the specification multiplied by the usage duration. For more information, see Billing overview. Note The ratio of vCPU cores to memory in GB must be between 1:1 and 1:4. All directories on the disk are writable. The disk space is shared. The disk size is tied to the instance lifetime of the underlying function. Data on the disk is lost when the instance is reclaimed by the system. To store files with persistence, you can mount a NAS file system or an OSS bucket. For more information, see Configure a NAS file system and Configure OSS.	vCPU: 0.35 vCPU Memory: 512 MB Disk: 512 MB (not billed, Function Compute provides a free quota of 10 GB disk space)
     Concurrency Per Instance	You can configure multiple concurrent requests for a single web function instance. This means a single function instance can process multiple requests simultaneously. For more information, see Configure concurrency per instance.	20

   • Elastic Configurations: Select an elastic mode.

     Parameter	Description	Example
     Minimum Instances	If your business is sensitive to latency, set **Minimum Instances** to 1 or higher. This pre-allocates resources and reduces cold start latency. Note If you set **Minimum Instances** to 1 or higher, and no elastic policy for minimum instances is configured or valid for a period, the current number of minimum instances is the value you set here. If you configure multiple elastic policies, the system calculates the Minimum Instances for each policy when it is triggered. The system then uses the highest value among the valid policies as the current Minimum Instances. For more information, see How is the current number of minimum instances calculated?.	Enabled

   • Function Code: Configure the function's runtime and code information.

     Configuration Item	Description	Example
     Runtime	Select Custom Runtime and choose a familiar language or framework. For more information, see Code development overview. To create an Event Function, select Built-in Runtime. For more information, see Create an event function. To create a GPU Function, select Custom Image. For more information, see Create a GPU function.	Custom Runtime > Node.js > Node.js 16
     Code Upload Method	Select how to upload code to Function Compute. Use Sample Code: The default method. Select sample code provided by Function Compute to create a function. Upload A ZIP Package: Select and upload a ZIP package that contains the function code. Upload A Folder: Select and upload a folder that contains the function code. Upload From OSS: Select the Bucket Name and File Name of the function code to upload.	Use Sample Code
     Startup Command	The startup command for the program. If you do not configure a startup command, manually create a startup script named `bootstrap` in the root directory of your code. The program uses this script to start.	npm run start
     Listening Port	The port that the HTTP server in the code listens on.	9000
     Execution Timeout	Set the timeout period. The default Execution Timeout is 60 seconds. The maximum value is 86,400 seconds.	60

   • Permissions, Network, and Storage: Configure the function's access role, network settings, and storage mounts.

     Parameter	Description	Example
     Function Role	The Function Compute platform uses this RAM role to generate temporary keys for accessing Alibaba Cloud resources and passes them to the code. For more information, see Use a function role to grant Function Compute permissions to access other Alibaba Cloud services.	mytestrole
     Allow Access To VPC	Enable this to allow the function to access resources in a VPC. For more information, see Configure network settings.	Enabled
     VPC	Required if you set Allow Access To VPC to Yes. Create a new VPC or select a VPC ID from the drop-down list.	fc.auto.create.vpc.1632317****
     VSwitch	Required if you set Allow Access To VPC to Yes. Create a new vSwitch or select a vSwitch ID from the drop-down list.	fc.auto.create.vswitch.vpc-bp1p8248****
     Security Group	Required if you set Allow Access To VPC to Yes. Create a new security group or select a security group from the drop-down list.	fc.auto.create.SecurityGroup.vsw-bp15ftbbbbd****
     Allow Default NIC To Access Public Network	Allow the function to access the public network through the default network interface card. Important When you use a static public IP address, you must disable Allow Default NIC To Access Public Network. Otherwise, the configured static public IP address does not take effect. For more information, see Configure a static public IP address.	Enabled
     Mount NAS File System	Mount a NAS file system to the function for persistent storage of shared data, such as models shared by multiple inference functions. For more information, see Configure a NAS file system. If you select automatic configuration, the system uses an existing General-purpose NAS file system named Alibaba-Fc-V3-Component-Generated. If a qualifying NAS file system does not exist in your account, the system creates one.	Enabled
     Mount OSS Object Storage	Mount an OSS bucket to the function for persistent storage of logs, business files, and other data. For more information, see Configure Object Storage Service (OSS).	Enabled

   • Logs And Tracing Analysis

     Parameter	Description	Example
     Log Feature	Persistently save the function's execution logs to Simple Log Service. This helps with code debugging, troubleshooting, and data analytics. For more information, see Configure the logging feature. Automatic Configuration: Automatically selects a log project that starts with serverless-<region_id>. Only one such log project is created in each region. If the system finds that this log project already exists in the current region, it uses the existing project. Custom Configuration: Manually specify the destination Log Project and Logstore.	Enabled

   • More Configurations

     Parameter	Description	Example
     Time Zone	Select the time zone for the function. This automatically adds the TZ environment variable to the function with the selected time zone as its value.	UTC
     Tags	Set tags for the function to group and manage functions. You must set both a tag key and a tag value.	key : value
     Resource Group	Select the resource group for the function. Use resource groups to manage your functions in groups.	Default Resource Group
     Environment Variables	Use environment variables to flexibly adjust the function's behavior without changing the code. For more information, see Configure environment variables.	{ "BUCKET_NAME": "MY_BUCKET", "TABLE_NAME": "MY_TABLE" }

Edit a function

You can edit, import, or export function code. To change other configuration items, see Configure a function.

1. On the Function Details page, you can change the function code on the Code tab. If the branch on the left indicates a change (① in the figure), you must first click Deploy Code to apply your changes. Then, click Test Function.

   

2. You can also export your code as a backup or upload new code for deployment.

   

   

Delete a function

Log on to the Function Compute console. On the Function List page, find the function you want to delete and click Delete in the Actions column. In the dialog box that appears, confirm that the function has no attached resources, such as triggers or elastic policies for minimum instances. Then, confirm the deletion.

Get the function ARN

An Alibaba Cloud Resource Name (ARN) is used to identify an Alibaba Cloud resource in your code. You can obtain the ARN of a function to reference it.

1. Log on to the Function Compute console. In the navigation pane on the left, choose Function Management > Function List.

2. In the top menu bar, select a region. Then, on the Function List page, click the name of the function.

3. On the Function Details page, click Copy ARN on the right to obtain the ARN of the target function.

   

References

• For different scenarios, Function Compute provides four function types: event functions, web functions, task functions, and GPU functions. For information about how to choose a function type for your scenario, see Technical selection guide.

• In addition to the console, Function Compute provides APIs and the Serverless Devs tool to manage functions. For more information, see CreateFunction and Serverless Devs Quick Start.

• If a function execution times out, see What do I do if a function execution times out with the error 'Function time out after'? for information about possible solutions.

• Infrequently used functions may have longer invocation times. For more information about the reasons, see Why do infrequently used functions have longer invocation times?. To eliminate the impact of cold start latency for elastic instances, you can set the minimum number of instances to 1 or higher.