Knative Lambda Runtimes (e.g KLR, pronounced clear) are Knative build templates that can be used to run an AWS Lambda function in a Kubernetes cluster installed with Knative.
The execution environment where the AWS Lambda function runs is a clone of the AWS Lambda cloud environment thanks to a custom AWS runtime interface and some inspiration from the LambCI project.
With these templates, you can run your AWS Lambda functions as is in a Knative powered Kubernetes cluster.
The examples below use the tm CLI to interact with Knative but one could also use kubectl:
To combine the runtime with your source, the examples below produce a new Docker image each time.
While these images can be considered temporary,
builds must be pushed to a Docker registry in order for Kubernetes to be able to pull.
By default tm uses Knative Local Registry,
equivalent to adding --registry-host knative.registry.svc.cluster.local to the commands below,
so that builds can run without registry authentication.
To override, set --registry-host and secrets according to tm docs.
- Install buildtemplate
tm deploy buildtemplate -f https://raw.githubusercontent.com/triggermesh/knative-lambda-runtime/master/python-3.7/buildtemplate.yaml
- Deploy function
tm deploy service python-test -f https://github.com/serverless/examples \
--build-template knative-python37-runtime \
--build-argument DIRECTORY=aws-python-simple-http-endpoint \
--build-argument HANDLER=handler.endpoint \
--wait
- Execute function via public URL
curl python-test.default.dev.triggermesh.io
{"statusCode": 200, "body": "{\"message\": \"Hello, the current time is 06:45:49.174383\"}"}
To use Python 2.7 runtime simply replace version tag in step 1 and 2 with python-2.7 and knative-python27-runtime accordingly.
- Install node 4.3 buildtemplate
tm deploy buildtemplate -f https://raw.githubusercontent.com/triggermesh/knative-lambda-runtime/master/node-4.x/buildtemplate.yaml
- Deploy example function
tm deploy service node4-test -f https://github.com/serverless/examples \
--build-template knative-node4-runtime \
--build-argument DIRECTORY=aws-node-serve-dynamic-html-via-http-endpoint \
--build-argument HANDLER=handler.landingPage \
--wait
- Function is ready
curl http://node43-test.default.dev.triggermesh.io
{"statusCode":200,"headers":{"Content-Type":"text/html"},"body":"\n <html>\n <style>\n h1 { color: #73757d; }\n </style>\n <body>\n <h1>Landing Page</h1>\n <p>Hey Unknown!</p>\n </body>\n </html>"}
- Prepare function code
mkdir example-lambda-nodejs
cd example-lambda-nodejs
cat > handler.js <<EOF
async function justWait() {
return new Promise((resolve, reject) => setTimeout(resolve, 100));
}
module.exports.sayHelloAsync = async (event) => {
await justWait();
return {hello: event && event.name || "Missing a name property in the event's JSON body"};
};
EOF
node -e "require('./handler').sayHelloAsync({}).then(h => console.log(h))"
- Install node-10.x buildtemplate
tm deploy buildtemplate -f https://raw.githubusercontent.com/triggermesh/knative-lambda-runtime/master/node-10.x/buildtemplate.yaml
- Deploy function
tm deploy service node-lambda -f . --build-template knative-node10-runtime \
--build-argument HANDLER=handler.sayHelloAsync \
--wait
Done:
curl http://node-lambda.default.dev.triggermesh.io --data '{"name": "Foo"}'
# {"hello":"Foo"}
- Prepare function code
You will create a main.go file in the example-lambda-go directory.
Create the directory and get into it:
mkdir example-lambda-go
cd example-lambda-go
Copy and Paste the following into a main.go file:
package main
import (
"fmt"
"context"
"github.com/aws/aws-lambda-go/lambda"
)
type MyEvent struct {
Name string `json:"name"`
}
func HandleRequest(ctx context.Context, name MyEvent) (string, error) {
return fmt.Sprintf("Hello %s!", name.Name ), nil
}
func main() {
lambda.Start(HandleRequest)
}
EOF
- Install Go buildtemplate
tm deploy buildtemplate -f https://raw.githubusercontent.com/triggermesh/knative-lambda-runtime/master/go-1.x/buildtemplate.yaml
- Deploy function
tm deploy service go-lambda -f . --build-template knative-go-runtime --wait
Done:
curl http://go-lambda.default.dev.triggermesh.io --data '{"Name": "Foo"}'
"Hello Foo!"
- Install Ruby 2.5 buildtemplate
tm deploy buildtemplate -f https://raw.githubusercontent.com/triggermesh/knative-lambda-runtime/master/ruby-2.5/buildtemplate.yaml
- Deploy example function
tm deploy service ruby-lambda -f https://github.com/serverless/examples --build-argument DIRECTORY=aws-ruby-simple-http-endpoint --build-argument HANDLER=handler.endpoint --build-template knative-ruby25-runtime --wait
- Function is ready
curl http://ruby-test-25.default.dev.triggermesh.io
{"statusCode":200,"body":"{\"date\":\"2019-01-14 19:10:29 +0000\"}"}
We would love your feedback on this tool so don't hesitate to let us know what is wrong and how we could improve it, just file an issue
This plugin is by no means part of CNCF but we abide by its code of conduct