erichripko/cnbp

•Updated over 5 years ago

Proof-of-concept BuildKit frontend for Cloud Native Buildpacks

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281

erichripko/cnbp repository overview

⁠Overview

This repository houses a barebones BuildKit frontend for Cloud Native Buildpacks⁠. Note that it's Linux only since BuildKit doesn't support Windows yet⁠. Frontend aims to implement Platform API 0.5⁠, but is not there yet. Published from this GitHub repository⁠.

⁠How to try it

Make sure that BuildKit is enabled in your daemon
Clone CNBP samples repository⁠
Add the following lines to the project.toml⁠. builder corresponds to --builder flag of pack build <image-name> [flags] invocation.

# syntax = erichripko/cnbp
[io.buildpacks.build]
builder = "some-builder"

Build it

$ docker build -t sample .
[+] Building 80.8s (28/28) FINISHED
 => [internal] load build definition from Dockerfile                                                               0.1s
 => => transferring dockerfile: 173B                                                                               0.0s
 => [internal] load .dockerignore                                                                                  0.0s
 => => transferring context: 2B                                                                                    0.0s
 => resolve image config for docker.io/erichripko/cnbp:latest                                                      0.0s
 => CACHED docker-image://docker.io/erichripko/cnbp:latest                                                         0.0s
 => [internal] load build definition from Dockerfile                                                               0.0s
 => => transferring dockerfile: 173B                                                                               0.0s
 => load metadata for docker.io/paketobuildpacks/builder:full                                                      0.0s
 => [internal] load context                                                                                        0.1s
 => => transferring context: 87.94kB                                                                               0.0s
 => Builder is paketobuildpacks/builder:full                                                                       0.6s
 => Load sources                                                                                                   0.2s
 => Detection                                                                                                      1.2s
 => Load group definition                                                                                          0.2s
 => Load plan definition                                                                                           0.2s
 => Build                                                                                                         41.2s
 => load metadata for docker.io/paketobuildpacks/run:full-cnb                                                      1.4s
 => Run image is index.docker.io/paketobuildpacks/run:full-cnb                                                    30.0s
 => Exporting launcher                                                                                             1.0s
 => Exporting buildpack layer /layers/paketo-buildpacks_ca-certificates/helper                                     0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/helper                                   0.2s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/java-security-properties                 0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/jre                                      0.5s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/jvmkill                                  0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_executable-jar/classpath                                   0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_spring-boot/helper                                         0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_spring-boot/spring-cloud-bindings                          0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_spring-boot/web-application-type                           0.1s
 => Exporting app layer                                                                                            0.2s
 => Exporting build metadata                                                                                       0.2s
 => exporting to image                                                                                             0.9s
 => => exporting layers                                                                                            0.8s
 => => writing image sha256:321aa7926a9e38422f53a1ebcfff5e32af9dcff4788e825199140eeb5d5e38a6                       0.0s
 => => naming to docker.io/library/sample                                                                          0.0s

Run the application: docker run --rm -d -p 8080:8080 sample /cnb/lifecycle/launcher
Observe that it works as expected

$ curl http://localhost:8080
...
        <h1>Hello, Buildpacker!</h1>
    </div>
</body>
</html>

⁠Setting environment variables

Buildpacks support configuration via build-time environment variables. These are mapped to build args in Docker, meaning that you can either:

Set them on CLI with --build-arg argument
Set them in Compose with args: attribute

For example, we can configure JVM version (see paketo Buildpacks docs⁠):

$ docker build -t sample --build-arg BP_JVM_VERSION=8 .
[+] Building 39.1s (29/29) FINISHED
 => [internal] load build definition from Dockerfile                                                               0.1s
 => => transferring dockerfile: 110B                                                                               0.0s
 => [internal] load .dockerignore                                                                                  0.0s
 => => transferring context: 2B                                                                                    0.0s
 => resolve image config for docker.io/erichripko/cnbp:latest                                                      0.0s
 => CACHED docker-image://docker.io/erichripko/cnbp:latest                                                         0.0s
 => [internal] load build definition from Dockerfile                                                               0.0s
 => => transferring dockerfile: 110B                                                                               0.0s
 => load metadata for docker.io/paketobuildpacks/builder:full                                                      0.0s
 => [internal] load context                                                                                        0.0s
 => => transferring context: 4.16kB                                                                                0.0s
 => Builder is paketobuildpacks/builder:full                                                                       0.0s
 => CACHED Load sources                                                                                            0.0s
 => CACHED Set BP_JVM_VERSION=8                                                                                    0.0s
 => CACHED Detection                                                                                               0.0s
 => CACHED Load group definition                                                                                   0.0s
 => CACHED Load plan definition                                                                                    0.0s
 => Build                                                                                                         32.0s
 => load metadata for docker.io/paketobuildpacks/run:full-cnb                                                      0.0s
 => CACHED Run image is index.docker.io/paketobuildpacks/run:full-cnb                                              0.0s
 => Exporting launcher                                                                                             0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_ca-certificates/helper                                     0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/helper                                   0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/java-security-properties                 0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/jre                                      0.8s
 => Exporting buildpack layer /layers/paketo-buildpacks_bellsoft-liberica/jvmkill                                  0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_executable-jar/classpath                                   0.2s
 => Exporting buildpack layer /layers/paketo-buildpacks_spring-boot/helper                                         0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_spring-boot/spring-cloud-bindings                          0.1s
 => Exporting buildpack layer /layers/paketo-buildpacks_spring-boot/web-application-type                           0.1s
 => Exporting app layer                                                                                            0.2s
 => Exporting build metadata                                                                                       0.1s
 => exporting to image                                                                                             1.3s
 => => exporting layers                                                                                            1.3s
 => => writing image sha256:7342883afc5ad3c62de8076ecb1261e75aa31ec4336d8af9b35c354368392334                       0.0s
 => => naming to docker.io/library/sample                                                                          0.0s

If you inspect Java in the container, you will see that it's indeed version 8:

$ java -version
openjdk version "1.8.0_282"
OpenJDK Runtime Environment (build 1.8.0_282-b08)
OpenJDK 64-Bit Server VM (build 25.282-b08, mixed mode)

⁠Caching

Layers that have cache=true will be stored in BuildKit build-time cache. For example:

$ docker build -t sample .
[+] Building 59.1s (33/33) FINISHED
...
$ echo bust > file
$ docker build -t sample .
[+] Building 32.2s (33/33) FINISHED
...
#13 Analyze
#13 sha256:bc95079754ce8087237b9e4b8b24413ba96328b79315060ed65064ade1dfa692
#13 2.178 Previous image with name "this-image-definitely-does-not-exist" not found
#13 2.598 Restoring metadata for "paketo-buildpacks/bellsoft-liberica:jdk" from cache
#13 2.599 Restoring metadata for "paketo-buildpacks/maven:application" from cache
#13 2.600 Restoring metadata for "paketo-buildpacks/maven:cache" from cache
#13 DONE 2.7s

#14 Restore
#14 sha256:1095e4ee229fee1a92fcb17a9bd16c164d5e61270d9341835d14b086954ec1ac
#14 0.443 Restoring data for "paketo-buildpacks/bellsoft-liberica:jdk" from cache
#14 0.445 Restoring data for "paketo-buildpacks/maven:application" from cache
#14 0.445 Restoring data for "paketo-buildpacks/maven:cache" from cache
#14 DONE 3.0s
...
#15 Build
#15 sha256:373931a74c93e2a8a589f93437fdf5deeb670228a5d6fc0b30551812cadb6305
#15 0.778
...
#15 0.880   BellSoft Liberica JDK 11.0.10: Reusing cached layer
...

Note that build-time cached can be wiped by running docker builder prune.

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over 5 years ago

docker pull erichripko/cnbp