$ pack build jacopen/testapp 2018/11/19 17:14:31 Pulling builder image 'packs/samples' (use --no-pull flag to skip this step) 2018/11/19 17:14:33 Selected run image 'packs/run' from stack 'io.buildpacks.stacks.bionic' 2018/11/19 17:14:33 Pulling run image 'packs/run' (use --no-pull flag to skip this step) *** DETECTING: 2018/11/19 08:14:43 Group: Sample Node.js Buildpack: pass *** ANALYZING: Reading information from previous image for possible re-use 2018/11/19 17:14:44 WARNING: skipping analyze, image not found 中略 ---> 170c76d2c366 Successfully built 170c76d2c366 Successfully tagged jacopen/testapp:latest Dockerfileすら無いnode.jsアプリのディレクトリで pack buildコマンドを一発打つだけで、 自動的にイメージのビルドやってくれて超らくちん というデモをしました