AWS Lambda Alias

假設我有一支 Lambda function，內容如下：

import json

def lambda_handler(event, context):
    # TODO implement
    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda! (Version 1)')
    }

並成功完成 Test：

Test Event Name
MyTest

Response
{
  "statusCode": 200,
  "body": "\"Hello from Lambda! (Version 1)\""
}

Function Logs
START RequestId: f0a719c8-1ffb-499d-942f-206f73dd0045 Version: $LATEST
END RequestId: f0a719c8-1ffb-499d-942f-206f73dd0045
REPORT RequestId: f0a719c8-1ffb-499d-942f-206f73dd0045	Duration: 11.58 ms	Billed Duration: 12 ms	Memory Size: 128 MB	Max Memory Used: 34 MB

Request ID
f0a719c8-1ffb-499d-942f-206f73dd0045

透過 AWS CLI 發佈第一個版本：

[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda publish-version --function-name HelloWorldFunction
{
    "FunctionName": "HelloWorldFunction",
    "FunctionArn": "arn:aws:lambda:us-east-1:827888540138:function:HelloWorldFunction:1",
    "Runtime": "python3.12",
    "Role": "arn:aws:iam::827888540138:role/service-role/HelloWorldFunction-role-2pj1z9b2",
    "Handler": "lambda_function.lambda_handler",
    "CodeSize": 277,
    "Description": "",
    "Timeout": 3,
    "MemorySize": 128,
    "LastModified": "2024-02-19T00:51:48.000+0000",
    "CodeSha256": "FGaiUQRyAxEPhQmLcV9dUlGl1qIvgba7Ae1zCInXC3g=",
    "Version": "1",
    "TracingConfig": {
        "Mode": "PassThrough"
    },
    "RevisionId": "d42bcc86-34a7-4ce4-a739-16e6d785c3af",
    "State": "Active",
    "LastUpdateStatus": "Successful",
    "PackageType": "Zip",
    "Architectures": [
        "x86_64"
    ],
    "EphemeralStorage": {
        "Size": 512
    },
    "SnapStart": {
        "ApplyOn": "None",
        "OptimizationStatus": "Off"
:...skipping...

修改 Lambda function，程式內容如下：

import json

def lambda_handler(event, context):
    # TODO implement
    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda! (Version 2)')
    }

發佈第二個版本：

[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda publish-version --function-name HelloWorldFunction
{
    "FunctionName": "HelloWorldFunction",
    "FunctionArn": "arn:aws:lambda:us-east-1:827888540138:function:HelloWorldFunction:2",
    "Runtime": "python3.12",
    "Role": "arn:aws:iam::827888540138:role/service-role/HelloWorldFunction-role-2pj1z9b2",
    "Handler": "lambda_function.lambda_handler",
    "CodeSize": 276,
    "Description": "",
    "Timeout": 3,
    "MemorySize": 128,
    "LastModified": "2024-02-19T01:02:46.000+0000",
    "CodeSha256": "xzDR5dGezW2VtWOvVraE1yY6kIQXIKy7UBS/1WDMeyw=",
    "Version": "2",
    "TracingConfig": {
        "Mode": "PassThrough"
    },
    "RevisionId": "299ba2c8-c055-4314-9b29-bbd9e9332e96",
    "State": "Active",
    "LastUpdateStatus": "Successful",
    "PackageType": "Zip",
    "Architectures": [
        "x86_64"
    ],
    "EphemeralStorage": {
        "Size": 512
    },
    "SnapStart": {

建立 Alias，PROD 指向 Version 1、DEV 指向 Version 2

[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda create-alias --function-name HelloWorldFunction --name PROD --function-version 1
{
    "AliasArn": "arn:aws:lambda:us-east-1:827888540138:function:HelloWorldFunction:PROD",
    "Name": "PROD",
    "FunctionVersion": "1",
    "Description": "",
    "RevisionId": "dfc0cdd9-5bf8-4483-bd0b-0cc098e4a70e"
}
[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda create-alias --function-name HelloWorldFunction --name DEV --function-version 2
{
    "AliasArn": "arn:aws:lambda:us-east-1:827888540138:function:HelloWorldFunction:DEV",
    "Name": "DEV",
    "FunctionVersion": "2",
    "Description": "",
    "RevisionId": "2526ec87-e93b-4189-828a-bab954fcf019"
}

執行 PROD alais，結果如下：

[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda invoke --function-name "HelloWorldFunction:PROD" outputfile.txt
{
    "StatusCode": 200,
    "ExecutedVersion": "1"
}

執行 DEV alais，結果如下：

[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda invoke --function-name "HelloWorldFunction:DEV" outputfile.txt
{
    "StatusCode": 200,
    "ExecutedVersion": "2"
}

Version 2 完成測試後，將 PROD 指向 Version 2：

[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda update-alias --function-name "HelloWorldFunction" --name "PROD" --function-version "2"
{
    "AliasArn": "arn:aws:lambda:us-east-1:827888540138:function:HelloWorldFunction:PROD",
    "Name": "PROD",
    "FunctionVersion": "2",
    "Description": "",
    "RevisionId": "9b3c5ce4-4c46-4bba-a5bf-ceb8291e090d"
}

執行 PROD alais，結果如下：

[cloudshell-user@ip-10-132-51-15 ~]$ aws lambda invoke --function-name "HelloWorldFunction:PROD" outputfile.txt
{
    "StatusCode": 200,
    "ExecutedVersion": "2"
}