heroku/buildpacks:18でPHPのアプリケーションのOCIイメージを作成します。
BuilderとStackを予めpullしておいてください。
docker pull heroku/buildpacks:18
docker pull heroku/pack:18
次のコマンドで"Hello World"アプリケーションを作成します。
mkdir hello-php
cd hello-php
cat <<'EOF' > index.php
<?php
echo 'Hello World!';
EOF
cat <<'EOF' > Procfile
web: vendor/bin/heroku-php-nginx
EOF
pack buildコマンドでイメージを作成します。
pack build making/pack-php --no-pull --builder heroku/buildpacks:18
BuilderとStackを事前にpullしていない場合は
--no-pullを外せば、ビルド時にBuilderとStackもpullしますが、ビルドが遅くなります。
次のようなログが出力されます。
===> DETECTING
[detector] heroku/php 0.1.2
[detector] heroku/procfile 0.5
===> ANALYZING
[analyzer] Warning: Image "index.docker.io/making/pack-php:latest" not found
===> RESTORING
===> BUILDING
[builder]
[builder] ! WARNING: No 'composer.json' found!
[builder] !
[builder] ! Your project only contains an 'index.php', no 'composer.json'.
[builder] !
[builder] ! Using 'index.php' to declare app type as PHP is deprecated and
[builder] ! may lead to unexpected behavior.
[builder] !
[builder] ! Please consider updating your codebase to utilize Composer and
[builder] ! modern dependency management in order to benefit from the latest
[builder] ! PHP runtimes and improved application performance, as well as
[builder] ! control over the PHP versions and extensions available.
[builder] !
[builder] ! For an introduction to dependency management with Composer and
[builder] ! how to get the most out of PHP on Heroku, refer to the docs at
[builder] ! https://getcomposer.org/doc/00-intro.md and
[builder] ! https://devcenter.heroku.com/articles/getting-started-with-php
[builder]
[builder] -----> Bootstrapping...
[builder] -----> Installing platform packages...
[builder] NOTICE: No runtime required in composer.lock; using PHP ^7.0.0
[builder] - apache (2.4.41)
[builder] - nginx (1.16.1)
[builder] - php (7.4.4)
[builder] -----> Installing dependencies...
[builder] Composer version 1.10.1 2020-03-13 20:34:27
[builder] -----> Preparing runtime environment...
[builder] -----> Checking for additional extensions to install...
[builder] -----> Discovering process types
[builder] Procfile declares types -> web
===> EXPORTING
[exporter] Adding layer 'launcher'
[exporter] Adding layer 'heroku/php:profile'
[exporter] Adding 1/1 app layer(s)
[exporter] Adding layer 'config'
[exporter] *** Images (30181cd95c4e):
[exporter] index.docker.io/making/pack-php:latest
[exporter] Adding cache layer 'heroku/php:shim'
Successfully built image making/pack-php
pack build時に--publishオプションをつけると、Docker Registryでのpushを行います。事前にdocker loginが必要です。
作成したイメージをdocker runで起動します。
docker run --rm -e PORT=8080 -p 8080:8080 making/pack-php
アプリケーションにアクセスします。
$ curl localhost:8080 -w '\n'
Hello World!
Docker Imageのサイズを確認します。
$ docker images | grep making/pack-php
making/pack-php latest 30181cd95c4e 40 years ago 566MB
pack inspect-imageでイメージを解析します。
$ pack inspect-image making/pack-php
Inspecting image: making/pack-php
REMOTE:
(not present)
LOCAL:
Stack: heroku-18
Base Image:
Reference: 60f9e03398de7d6a5268be95224246f05eed9f1eecb1fe7605753261f2bd871a
Top Layer: sha256:ceefbd5b67bc32a9d87867c8c8d375675246e9db9b470cb95133b4e93429b113
Run Images:
heroku/pack:18
Buildpacks:
ID VERSION
heroku/php 0.1.2
heroku/procfile 0.5
Processes:
TYPE SHELL COMMAND ARGS
web (default) bash vendor/bin/heroku-php-nginx
おわったらDocker Imageを削除します。
docker rmi making/pack-php