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Commit 626b770

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Initial project setup
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‎.gitignore

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.DS_Store
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*.iml
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runtime.zip
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aws-lambda-java-libs/
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.idea/
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target/
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cdk.out/
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‎Dockerfile

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FROM --platform=linux/amd64 amazonlinux:2 AS packer
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# Add the Amazon Corretto repository
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RUN rpm --import https://yum.corretto.aws/corretto.key
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RUN curl -L -o /etc/yum.repos.d/corretto.repo https://yum.corretto.aws/corretto.repo
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# Update the packages and install Amazon Corretto 18, Maven and Zip
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RUN yum -y update
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RUN yum install -y java-18-amazon-corretto-devel maven zip
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# Set Java 18 as the default
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RUN update-alternatives --set java "/usr/lib/jvm/java-18-amazon-corretto/bin/java"
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RUN update-alternatives --set javac "/usr/lib/jvm/java-18-amazon-corretto/bin/javac"
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# Copy the software folder to the image and build the function
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COPY software software
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WORKDIR /software/example-function
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RUN mvn clean package
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# Find JDK module dependencies dynamically from our uber jar
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RUN jdeps \
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# dont worry about missing modules
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--ignore-missing-deps \
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# suppress any warnings printed to console
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-q \
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# java release version targeting
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--multi-release 18 \
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# output the dependencies at end of run
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--print-module-deps \
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# pipe the result of running jdeps on the function jar to file
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target/function.jar > jre-deps.info
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# Create a slim Java 18 JRE which only contains the required modules to run this function
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RUN jlink --verbose \
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--compress 2 \
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--strip-java-debug-attributes \
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--no-header-files \
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--no-man-pages \
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--output /jre18-slim \
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--add-modules $(cat jre-deps.info)
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# Use Javas Application Class Data Sharing feature
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# It creates the file /jre18-slim/lib/server/classes.jsa
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RUN /jre18-slim/bin/java -Xshare:dump -Xbootclasspath/a:/software/example-function/target/function.jar
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# Package everything together into a custom runtime archive
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WORKDIR /
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COPY bootstrap bootstrap
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RUN chmod 755 bootstrap
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RUN cp /software/example-function/target/function.jar function.jar
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RUN zip -r runtime.zip \
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bootstrap \
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function.jar \
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/jre18-slim

‎README.md

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## My Project
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# AWS Lambda custom runtime based on minimal Java 18 JRE
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An AWS Lambda custom runtime to enable Java 18 support on a minimalistic JRE, which only includes the Java modules required by the application.
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TODO: Fill this README out!
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![overview](docs/overview.png)
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Be sure to:
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1. Use the application code (uber.jar), download the preferred Java version and create a bootstrap file with optimized starting instructions for the application.
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2. Take advantage of using jdeps and jlink to create a minified Java runtime based on the application needs, start the app with Class Data Sharing enabled to get the classes file for later start optimizations and build the runtime.zip out of those components
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3. Deploy the runtime, including the app, to AWS Lambda via AWS CDK
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* Change the title in this README
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* Edit your repository description on GitHub
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## Getting started
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1. Download or clone the repository.
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2. install prerequisite software:
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1. Install [AWS CDK](https://docs.aws.amazon.com/cdk/latest/guide/getting_started.html)
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2. Install [Docker](https://docs.docker.com/get-docker/)
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3. Build and package the AWS Lambda function and create the AWS Lambda custom runtime using Docker:
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```bash
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./build.sh
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```
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4. Provision the AWS infrastructure (Amazon API Gateway, AWS Lambda and Amazon DynamoDB) using AWS CDK:
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```bash
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./provision-infrastructure.sh
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```
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The API Gateway endpoint URL is displayed in the output and saved in the file `infrastructure/target/outputs.json`. The contents are similar to:
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```
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{
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"LambdaCustomRuntimeMinimalJRE18InfrastructureStack": {
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"apiendpoint": "https://<API_ID>.execute-api.<AWS_REGION>.amazonaws.com"
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}
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}
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```
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## Using Artillery to test the changes
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First, install prerequisites:
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1. Install [jq](https://stedolan.github.io/jq/) and [Artillery Core](https://artillery.io/docs/guides/getting-started/installing-artillery.html)
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2. Run the following script from the projects root directory:
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```bash
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artillery run -t $(cat infrastructure/target/outputs.json | jq -r '.LambdaCustomRuntimeMinimalJRE18InfrastructureStack.apiendpoint') -v '{ "url": "/custom-runtime" }' infrastructure/loadtest.yml
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```
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### Check results in Amazon CloudWatch Insights
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1. Navigate to Amazon **[CloudWatch Logs Insights](https://console.aws.amazon.com/cloudwatch/home?#logsV2:logs-insights)**.
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2. Select the log groups `/aws/lambda/custom-runtime-java-18` from the drop-down list
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3. Copy the following query and choose **Run query**:
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```
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filter @type = "REPORT"
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| parse @log /\d+:\/aws\/lambda\/(?<function>.*)/
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| stats
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count(*) as invocations,
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pct(@duration+coalesce(@initDuration,0), 0) as p0,
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pct(@duration+coalesce(@initDuration,0), 25) as p25,
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pct(@duration+coalesce(@initDuration,0), 50) as p50,
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pct(@duration+coalesce(@initDuration,0), 75) as p75,
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pct(@duration+coalesce(@initDuration,0), 90) as p90,
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pct(@duration+coalesce(@initDuration,0), 95) as p95,
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pct(@duration+coalesce(@initDuration,0), 99) as p99,
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pct(@duration+coalesce(@initDuration,0), 100) as p100
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group by function, ispresent(@initDuration) as coldstart
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| sort by coldstart, function
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```
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![AWS Console](docs/insights-query.png)
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You see results similar to:
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![Resuts](docs/results.png)
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For cold-starts only you will see results similar to:
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![Resuts](docs/cold-start-only.png)
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## Security
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## License
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This library is licensed under the MIT-0 License. See the LICENSE file.
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‎bootstrap

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#!/bin/sh
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$LAMBDA_TASK_ROOT/jre18-slim/bin/java \
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--add-opens java.base/java.util=ALL-UNNAMED \
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-XX:+TieredCompilation \
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-XX:TieredStopAtLevel=1 \
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-Xshare:on \
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-XX:+UseSerialGC \
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-jar function.jar "$_HANDLER"

‎build.sh

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#!/bin/sh
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# remove a maybe earlier build custom runtime archives
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rm runtime.zip
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# Build the docker image which will:
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# 1. Use the latest Amazon Linux 2 image and install Amazon Corretto 18
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# 2. Copy the software directory into the Docker container and run the build using Maven, which creates an uber jar
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# 3. run jdeps to calculate the module dependencies for this uber jar
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# 4. feeding the jdeps result into jlink, creating a minimal Java 18 JRE which only contains the necessary modules to run this jar
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# 5. Use Javas Application Class Data Sharing for further optimizations
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# 6. Create the runtime.zip archive, based on the AWS Lambda custom runtime specification
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docker build -f Dockerfile --progress=plain -t lambda-custom-runtime-minimal-jre-18-x86 .
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# Extract the runtime.zip from the Docker container and store it locally
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docker run --rm --entrypoint cat lambda-custom-runtime-minimal-jre-18-x86 runtime.zip > runtime.zip

‎docs/cold-start-only.png

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‎docs/insights-query.png

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‎docs/overview.png

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‎docs/results.png

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‎infrastructure/.gitignore

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.classpath.txt
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target
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.classpath
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.project
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.idea
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.settings
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.vscode
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*.iml
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# CDK asset staging directory
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.cdk.staging
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cdk.out
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outputs.json
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