CDK Speedster - fast Lambda deployment
CDK is great for serverless architectures. But the deploy times even for small lambda functions is to slow.
Here is a little trick which can speed up things a lot. A small caveat: It is cheating.
CDK creates a Cloudformation change set each time it deploys. That is great for large deployments, but not if you change some code in a Lambda function and want to test the function.
But If the following applies to your project:
- you only change the function code
- your code is zipped smaller than 50 MB see limits
Then you can upload the code directly!
Here is how with the example of the “lambda-simple” of the tecracer githup cdk-example repo.
Normal deploy with CDK and CloudFormation change set
time task deploy
npm run build
> cdk-lambda-simple@0.1.0 build cdk-templates/lambda-simple
> tsc
Profile gg*******n
cdk deploy --require-approval never --profile $AWSUME_PROFILE
CdkLambdaSimpleStack: deploying...
[0%] start: Publishing 761361f83f6a8a4cedf755c1d3b6f714678c3fdf70a6472078d826d47592fd96:current
[100%] success: Published 761361f83f6a8a4cedf755c1d3b6f714678c3fdf70a6472078d826d47592fd96:current
CdkLambdaSimpleStack: creating CloudFormation changeset...
✅ CdkLambdaSimpleStack
Stack ARN:
arn:aws:cloudformation:eu-central-1:123456789012:stack/CdkLambdaSimpleStack/c2b07b40-cb41-11ea-a4d8-064aba521f98
task deploy 5,20s user 0,58s system 11% cpu 51,752 total
51 seconds in total!
Add fast deploy
Using the aws Lambda api directly to update the code is faster.
1 - Add output with function name
Add an output to your cdk code.
new CfnOutput(this, "HelloLambda", {
value: hello.functionName
}
)
2 - Deploy the stack
Get Lambda function name:
CdkLambdaSimpleStack.HelloLambda = CdkLambdaSimpleStack-HelloHandler2E4FBA4D-1HQ0BSAQCW4Z0
3 - Add following lines to the Taskfile:
deploy-auth-fast:
desc: Only Update Lambda Auth code
dir: lambda
vars:
zip: ../dist/hello.zip
lambda: CdkLambdaSimpleStack-HelloHandler2E4FBA4D-1HQ0BSAQCW4Z0
cmds:
- zip -r -dd -q {{.zip}} .
- aws lambda update-function-code --function-name {{.lambda}} --zip-file fileb://{{.zip}}
Or put the lines in a shell script.
4 - Change some code
1 exports.handler = async function(event) {
2 console.log('request:', JSON.stringify(event, undefined, 2));
3 return {
4 statusCode: 200,
5 headers: { 'Content-Type': 'text/plain' },
6 body: `Hello, CDK 1.53 again! You've hit ${event.path}\n`
7 };
8 };
9
5 - Deploy
time task deploy-auth-fast
zip -r -dd -q ../dist/hello.zip .
aws lambda update-function-code --function-name CdkLambdaSimpleStack-HelloHandler2E4FBA4D-1HQ0BSAQCW4Z0 --zip-file fileb://../dist/hello.zip
{
"FunctionName": "CdkLambdaSimpleStack-HelloHandler2E4FBA4D-1HQ0BSAQCW4Z0",
"FunctionArn": "arn:aws:lambda:eu-central-1:123456789012:function:CdkLambdaSimpleStack-HelloHandler2E4FBA4D-1HQ0BSAQCW4Z0",
"Runtime": "nodejs10.x",
"Role": "arn:aws:iam::123456789012:role/CdkLambdaSimpleStack-HelloHandlerServiceRole11EF7C-1GSSZUNT7PQE7",
"Handler": "hello.handler",
"CodeSize": 3225,
"Description": "",
"Timeout": 3,
"MemorySize": 1024,
"LastModified": "2020-07-21T11:15:36.460+0000",
"CodeSha256": "5dATrYq8ruN5z4LwLdO/uJLC7ExByjCG22DpRPtgN4c=",
"Version": "$LATEST",
"TracingConfig": {
"Mode": "PassThrough"
},
"RevisionId": "e5555ef7-d87a-45fe-b5a4-5cfe479a81cc",
"State": "Active",
"LastUpdateStatus": "Successful"
}
task deploy-auth-fast 0,51s user 0,22s system 65% cpu 1,119 total
Now you are 50 times faster!
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Stay healthy in the cloud and on earth!
Thanks
Photo by amirali mirhashemian on Unsplash
