AWS Lambda, Serverless

AWS Lambda + Serverless - Getting started

Installation:

• Node.js
• AWS CLI
• Serverless framework: npm install -g serverless

Setup:

• Create an user in AWS IAM with apt rights eg: sls-usr.
• Configure Serverless framework in your system with the user profile (created in previous step) by providing key and secret:
  serverless config credentials --provider aws --key key-created-for-sls-usr --secret sls-usr-secret --profile sls-usr

Create a lambda function by using serverless create:

1
2
3

sls create --template aws-nodejs
sls create -t aws-nodejs
sls create -t aws-nodejs --path folder-path

Open serverless.yml :
Check service, providers (name, runtime, profile: sls-user-name, region)
Also set profile to the user above sls-usr

Update the code in handler.

To deploy:
sls deploy -v

To test the function:
sls invoke --function functionName --logs

Test function locally:
sls invoke local --function functionName

To locally debug via VS Code:

• Install serverless as a dev dependency npm install serverless -D
• Add launch.json in .vscode:

1
2
3
4
5
6
7
8
9
10
11
12

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Debug process",
            "program": "${workspaceFolder}\\node_modules\\serverless\\bin\\serverless",
            "args": ["invoke", "local", "-f", "process", "--data", "{}"]
        }
    ]
}

Add breakpoints (default key: F9), start debugging (default key: F5) and enjoy!

After updating a function in order to avoid updating whole stack, we can update a single function by:
sls deploy function --function functionName

To fetch logs:
sls logs -f functionName -t

Cleanup:
sls remove