rogervinas / example-spring-boot

Spring Boot & CRaC

example-spring-boot

This is an example of Spring Boot Getting Started modified to work on OpenJDK CRaC.

Changes: https://github.com/CRaC/example-spring-boot/compare/base..crac

For more info, check:

• What is CRaC?
• CRaC Usage Guidelines

Building

Use maven to build

mvn package

Running

Please refer to README for details.

Preparing the image

1. Run the JDK in the checkpoint mode

$JAVA_HOME/bin/java -XX:CRaCCheckpointTo=cr -jar target/example-spring-boot-0.0.1-SNAPSHOT.jar

2. Warm-up the instance

siege -c 1 -r 100000 -b http://localhost:8080

3. Request checkpoint

jcmd target/example-spring-boot-0.0.1-SNAPSHOT.jar JDK.checkpoint

Restoring

$JAVA_HOME/bin/java -XX:CRaCRestoreFrom=cr

Running with docker

docker build -t zulu-crac .

./mvnw clean package
java -jar target/example-spring-boot-0.0.1-SNAPSHOT.jar
curl -i http://localhost:8080

docker run --privileged -it --rm -p 8080:8080 -v $PWD:/opt/mnt --name example-spring-boot-crac zulu-crac bash

echo 128 > /proc/sys/kernel/ns_last_pid
java -XX:CRaCCheckpointTo=/opt/mnt/crac -jar /opt/mnt/target/example-spring-boot-0.0.1-SNAPSHOT.jar

docker exec -it example-spring-boot-crac bash
jcmd 129 JDK.checkpoint

java -XX:CRaCRestoreFrom=/opt/mnt/crac

docker build -t example-spring-boot-crac-restore -f Dockerfile.restore .
docker run -it --rm -p 8080:8080 --name example-spring-boot-crac-restore example-spring-boot-crac-restore