Different build example for Quarkus on OpenShift

This is a small quarkus demo project that can be used to deploy to openshift

Build and Deploy a Quarkus application using Java S2I

oc new-project demo-jvm

oc new-app registry.access.redhat.com/redhat-openjdk-18/openjdk18-openshift~https://github.com/tqvarnst/q-app

oc expose svc q-app

This will checkout this project into a container and build a JAR file and create a runnable container. The new-app command will also create a service and deployment configurations for us.

Build and Deploy a native Quarkus application using S2I

To deploy this application as a native build using the Quarkus S2I image do the following

oc new-project demo-s2i-native

oc new-app --name=q-app quay.io/quarkus/centos-quarkus-native-s2i:graalvm-1.0.0-rc15~https://github.com/tqvarnst/q-app.git

oc cancel-build bc/q-app

oc patch bc/q-app -p '{"spec":{"resources":{"limits":{"cpu":"4", "memory":"4Gi"}}}}'

oc start-build q-app

# wait for the build to finish (web console or `oc logs -f bc/q-app`)

oc expose svc q-app

The reason that we are cancelling the build shortly after creating it (in the oc new-app command) is because the default resource that OpenShift uses to build a native application using GraalVM isn't enough. Therefor we first patch the build config giving it more resources and then start the build again.

Deploy as minimal runtime container

In the Deploy as S2I example the container that builds the native application is also running the application. This means that the image contains both OpenJDK, GraalVM, Maven, etc even though that is not required to run the application.

An alternative way of deploying this is to use a chained build process where we have one build process to build the native application and another one that creates a minimal container that only consists of the base container and the native application it self.

The following commands will create a chained build.

oc new-project demo-minimal-native

oc new-build --name=q-app-build quay.io/quarkus/centos-quarkus-native-s2i:graalvm-1.0.0-rc15~https://github.com/tqvarnst/q-app.git 

oc cancel-build bc/q-app-build

oc patch bc/q-app-build -p '{"spec":{"resources":{"limits":{"cpu":"4", "memory":"4Gi"}}}}'

oc start-build q-app-build

oc new-build --name=q-app \
    --docker-image=registry.access.redhat.com/ubi7-dev-preview/ubi-minimal \
    --source-image=q-app-build \
    --source-image-path='/home/quarkus/application:.' \
    --dockerfile=$'FROM registry.access.redhat.com/ubi7-dev-preview/ubi-minimal:latest\nCOPY application /application\nCMD /application -Xmx8M -Xms8M -Xmn8M\nEXPOSE 8080' \
    --allow-missing-imagestream-tags

# wait for the build to finish (web console or `oc logs -f bc/q-app`)

oc new-app q-app

oc expose svc q-app