AntonKozlov / crac-demo

• Clone the project

git clone [e-mail]:tzolov/crac-demo.git

• Change directory to the crac-demo folder and build:

mvn clean install

under target you will see the crac-demo-1.0.0-SNAPSHOT-shaded.jar uber jar.

• From within the crac-demo folder run the java_17_crac container:

docker run --network "host" -it --privileged --rm --name=my-crac-app -v $(pwd)/target:/opt/mnt tzolov/java_17_crac:latest /bin/bash

The java_17_crac uses Ubuntu-22.04 and pre-installs JDK 17 CRaC + 5. Here is the Dockerfile.

• Start the crac-demo application inside the running container:

java -XX:CRaCCheckpointTo=/opt/crac-files -jar /opt/mnt/crac-demo-1.0.0-SNAPSHOT-shaded.jar

wait for 15-20 seconds until you see printout like 0:1:2:3:4:5...

• From another terminal trigger the CRaC checkpoint:

docker exec -it  --privileged -u root my-crac-app jcmd /opt/mnt/crac-demo-1.0.0-SNAPSHOT-shaded.jar JDK.checkpoint

later creates the checkpoint under the container's /opt/crac-files folder and stops the original application.

• In the first terminal (e.g. the running my-crac-app container) restart the application from the checkpoint:

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