This is an example of Spring Boot Getting Started modified to work on OpenJDK CRaC, which consists only in using Spring Boot 3.2+ and adding the org.crac:crac
dependency (version 1.4.0
or later).
Use Maven to build
./mvnw package
Please refer to README for details.
If you see an error, you may have to update your criu
permissions with
sudo chown root:root $JAVA_HOME/lib/criu
sudo chmod u+s $JAVA_HOME/lib/criu
- Run the JDK in the checkpoint mode
$JAVA_HOME/bin/java -XX:CRaCCheckpointTo=cr -jar target/example-spring-boot-0.0.1-SNAPSHOT.jar
- Warm-up the instance
siege -c 1 -r 100000 -b http://localhost:8080
- Request checkpoint
jcmd target/example-spring-boot-0.0.1-SNAPSHOT.jar JDK.checkpoint
$JAVA_HOME/bin/java -XX:CRaCRestoreFrom=cr
- After building the project locally create an image to be checkpointed.
docker build -f Dockerfile.checkpoint -t example-spring-boot-checkpoint .
- Start a (detached) container that will be checkpointed. Note that we're mounting
target/cr
into the container.
docker run -d --rm -v $(pwd)/target/cr:/cr --cap-add=CHECKPOINT_RESTORE --cap-add=SYS_PTRACE -p 8080:8080 --name example-spring-boot-checkpoint example-spring-boot-checkpoint
- Validate that the container is up and running (here you could also perform any warm-up)
curl localhost:8080
Greetings from Spring Boot!
- Checkpoint the running container
docker exec -it example-spring-boot-checkpoint jcmd example-spring-boot JDK.checkpoint
- Build another container image by adding the data from
target/cr
on top of the previous image and adjusting entrypoint:
docker build -f Dockerfile.restore -t example-spring-boot .
- (Optional) Start the application in the restored container and validate that it works
docker run -it --rm -p 8080:8080 example-spring-boot
# In another terminal
curl localhost:8080