This project shows how to build a Spring Boot container image with Cloud-Native Buildpacks (CNB).
You don't need to write a Dockerfile anymore: using CNB you get
secured up-to-date container images out of your source code.
You don't need to care about the runtime environment (JVM) or optimizing the container (such as Java memory settings): CNB will automatically provision dependencies and configure your container.
Download and install the pack CLI.
You'll need a Docker daemon running to build container images.
If you run pack CLI for the first time, you need to set a default
builder:
$ pack set-default-builder gcr.io/paketo-buildpacks/builder:base
Builder gcr.io/paketo-buildpacks/builder:base is now the default builderYou may select one of the suggested builders:
$ pack suggest-builders
Suggested builders:
Google: gcr.io/buildpacks/builder:v1 Ubuntu 18 base image with buildpacks for .NET, Go, Java, Node.js, and Python
Heroku: heroku/buildpacks:18 heroku-18 base image with buildpacks for Ruby, Java, Node.js, Python, Golang, & PHP
Paketo Buildpacks: gcr.io/paketo-buildpacks/builder:base Ubuntu bionic base image with buildpacks for Java, NodeJS and Golang
Paketo Buildpacks: gcr.io/paketo-buildpacks/builder:full-cf cflinuxfs3 base image with buildpacks for Java, .NET, NodeJS, Golang, PHP, HTTPD and NGINX
Paketo Buildpacks: gcr.io/paketo-buildpacks/builder:tiny Tiny base image (bionic build image, distroless run image) with buildpacks for Golang
Tip: Learn more about a specific builder with:
pack inspect-builder <builder-image>You're now ready to use CNB.
Run this command to build a container image:
$ pack build triathlonguy/cnb-springboot
...
Successfully built image triathlonguy/cnb-springbootA lot of dependencies are downloaded in the first run. These dependencies will be cached so that next runs are faster.
After a couple of minutes, your container image will be published to your local Docker daemon:
$ docker image ls
REPOSITORY TAG IMAGE ID
triathlonguy/cnb-springboot latest b1a0d242e5ecYou can run this container right away:
$ docker run --rm -p 8080:8080/tcp triathlonguy/cnb-springboot
Calculated JVM Memory Configuration: -XX:MaxDirectMemorySize=10M -XX:MaxMetaspaceSize=87457K -XX:ReservedCodeCacheSize=240M -Xss1M -Xmx68718877278K (Head Room: 0%, Loaded C
lass Count: 13027, Thread Count: 250, Total Memory: 70368744177664)
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.4.RELEASE)
2020-01-28 15:03:12.372 WARN 1 --- [ main] pertySourceApplicationContextInitializer : Skipping 'cloud' property source addition because not in a cloud
2020-01-28 15:03:12.391 WARN 1 --- [ main] nfigurationApplicationContextInitializer : Skipping reconfiguration because not in a cloud
2020-01-28 15:03:12.424 INFO 1 --- [ main] f.a.demos.cnb.springboot.Application : Starting Application on b087eee7b53a with PID 1 (/workspace/BOOT-INF/classes started by cnb in /workspace)
2020-01-28 15:03:12.432 INFO 1 --- [ main] f.a.demos.cnb.springboot.Application : No active profile set, falling back to default profiles: default
2020-01-28 15:03:14.878 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-01-28 15:03:14.907 INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-01-28 15:03:14.909 INFO 1 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.30]
2020-01-28 15:03:15.058 INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-01-28 15:03:15.058 INFO 1 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2506 ms
2020-01-28 15:03:15.972 INFO 1 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-01-28 15:03:16.313 INFO 1 --- [ main] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page template: index
2020-01-28 15:03:16.597 INFO 1 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 3 endpoint(s) beneath base path '/actuator'
2020-01-28 15:03:16.800 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-01-28 15:03:16.810 INFO 1 --- [ main] f.a.demos.cnb.springboot.Application : Started Application in 5.746 seconds (JVM running for 10.604)Use these Kubernetes descriptors to deploy this app to your cluster:
$ kubectl apply -f k8sThis app will be deployed to namespace cnb-springboot:
NAME READY STATUS RESTARTS AGE
pod/app-64b68d47f9-c4792 1/1 Running 0 38s
NAME READY UP-TO-DATE AVAILABLE AGE
deployment.extensions/app 1/1 1 1 38s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/app LoadBalancer 10.0.12.172 35.223.235.122 80:32720/TCP 38sAccess the application by pointing your browser to the External IP of the service, or send a cURL request.
In this sample, the URL would be http://35.223.235.122 and the cUrl request curl curl http://35.223.235.122
Contributions are always welcome!
Feel free to open issues & send PRs.
Copyright © 2020 VMware, Inc.
This project is licensed under the Apache Software License version 2.0.
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