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Create Cron Jobs on AWS Lambda with cloudwatch event

CloudOpz

Quick start aws-chalice

A very simple example of creating lambda function with cloudwatch event using aws-chalice. It provides an optional of how to create lambda function beyond aws-cdk (eg. python lamdbda cron)

What’s In This Document

• Create new chalice project
• Create the functions in app.py
• Config lambda fuction attributes
• Deploy chalice to create cloudwatch event which trigger lambda cron
• Check result
• Clean up

🚀 Create new chalice project

⚡ $ chalice new-project lambda-cron
⚡ $ cd lambda-cron/

🚀 Create the functions in app.py

app,py

from datetime import datetime
from chalice import Chalice


app = Chalice(app_name='lambda-cron')
app.debug = True


#@app.schedule('cron(0 18 ? * MON-FRI *)')
@app.schedule('cron(* * ? * * *)')
def cron_tab(event):
    print(f"{datetime.now()}: I'm running!")

🚀 Config lambda fuction attributes

• Here is just config lambda timeout

⚡ $ cat .chalice/config.json 
{ 
  "version": "2.0",
  "app_name": "lambda-cron",
  "stages": {
    "dev": {
      "lambda_timeout": 300
    }
  } 
}

🚀 Deploy chalice to create cloudwatch event which trigger lambda cron

⚡ $ chalice deploy
Creating deployment package.
Creating IAM role: lambda-cron-dev
Creating lambda function: lambda-cron-dev-cron_tab
Resources deployed:
  - Lambda ARN: arn:aws:lambda:ap-northeast-2:111111111111:function:lambda-cron-dev-cron_tab

• Note: Chalice auto create IAM role lambda-cron-dev base on the need of the function, we can disable by adding "manage_iam_role": false but you must provide the IAM ARN in config.json eg. "iam_role_arn": "arn:aws:iam::111111111111:role/lambda-cron-dev"

🚀 Check result

• Lambda function with Event Bridge trigger

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• Cloudwatch event rule

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• Cloudwatch log group

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🚀 Clean up

⚡ $ chalice delete
Deleting function: arn:aws:lambda:ap-northeast-2:111111111111:function:lambda-cron-dev-cron_tab
Deleting IAM role: lambda-cron-dev

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