Remove a few more onbuild references

jruby/content.md

@@ -15,14 +15,23 @@ JRuby leverages the robustness and speed of the JVM while providing the same Rub
 ## Create a `Dockerfile` in your Ruby app project
 
 ```dockerfile
-FROM %%IMAGE%%:1.7-onbuild
+FROM %%IMAGE%%:9
+
+# throw errors if Gemfile has been modified since Gemfile.lock
+RUN bundle config --global frozen 1
+
+WORKDIR /usr/src/app
+
+COPY Gemfile Gemfile.lock ./
+RUN bundle install
+
+COPY . .
+
 CMD ["./your-daemon-or-script.rb"]
 ```
 
 Put this file in the root of your app, next to the `Gemfile`.
 
-This image includes multiple `ONBUILD` triggers which should be all you need to bootstrap most applications. The build will `COPY . /usr/src/app` and `RUN bundle install`.
-
 You can then build and run the Ruby image:
 
 ```console
@@ -32,16 +41,16 @@ $ docker run -it --name my-running-script my-ruby-app
 
 ### Generate a `Gemfile.lock`
 
-The `onbuild` tag expects a `Gemfile.lock` in your app directory. This `docker run` will help you generate one. Run it in the root of your app, next to the `Gemfile`:
+The above example `Dockerfile` expects a `Gemfile.lock` in your app directory. This `docker run` will help you generate one. Run it in the root of your app, next to the `Gemfile`:
 
 ```console
-$ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app %%IMAGE%%:1.7 bundle install --system
+$ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app %%IMAGE%%:9 bundle install --system
 ```
 
 ## Run a single Ruby script
 
 For many simple, single file projects, you may find it inconvenient to write a complete `Dockerfile`. In such cases, you can run a Ruby script by using the Ruby Docker image directly:
 
 ```console
-$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp %%IMAGE%%:1.7 jruby your-daemon-or-script.rb
+$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp %%IMAGE%%:9 jruby your-daemon-or-script.rb
 ```

pypy/content.md

@@ -13,19 +13,33 @@ PyPy started out as a Python interpreter written in the Python language itself.
 ## Create a `Dockerfile` in your Python app project
 
 ```dockerfile
-FROM %%IMAGE%%:3-onbuild
+FROM %%IMAGE%%:3
+
+WORKDIR /usr/src/app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
 CMD [ "pypy3", "./your-daemon-or-script.py" ]
 ```
 
-or (if you need to use PyPy 2):
+or (if you need to use Python 2):
 
 ```dockerfile
-FROM %%IMAGE%%:2-onbuild
+FROM %%IMAGE%%:2
+
+WORKDIR /usr/src/app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
 CMD [ "pypy", "./your-daemon-or-script.py" ]
 ```
 
-These images include multiple `ONBUILD` triggers, which should be all you need to bootstrap most applications. The build will `COPY` a `requirements.txt` file,`RUN pip install` on said file, and then copy the current directory into`/usr/src/app`.
-
 You can then build and run the Docker image:
 
 ```console

ruby/content.md

@@ -11,15 +11,23 @@ Ruby is a dynamic, reflective, object-oriented, general-purpose, open-source pro
 ## Create a `Dockerfile` in your Ruby app project
 
 ```dockerfile
-FROM %%IMAGE%%:2.1-onbuild
+FROM %%IMAGE%%:2.5
+
+# throw errors if Gemfile has been modified since Gemfile.lock
+RUN bundle config --global frozen 1
+
+WORKDIR /usr/src/app
+
+COPY Gemfile Gemfile.lock ./
+RUN bundle install
+
+COPY . .
+
 CMD ["./your-daemon-or-script.rb"]
 ```
 
 Put this file in the root of your app, next to the `Gemfile`.
 
-This image includes multiple `ONBUILD` triggers which should be all you need to bootstrap most applications. The build will `COPY . /usr/src/app` and `RUN
-bundle install`.
-
 You can then build and run the Ruby image:
 
 ```console
@@ -29,18 +37,18 @@ $ docker run -it --name my-running-script my-ruby-app
 
 ### Generate a `Gemfile.lock`
 
-The `onbuild` tag expects a `Gemfile.lock` in your app directory. This `docker run` will help you generate one. Run it in the root of your app, next to the `Gemfile`:
+The above example `Dockerfile` expects a `Gemfile.lock` in your app directory. This `docker run` will help you generate one. Run it in the root of your app, next to the `Gemfile`:
 
 ```console
-$ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app %%IMAGE%%:2.1 bundle install
+$ docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app %%IMAGE%%:2.5 bundle install
 ```
 
 ## Run a single Ruby script
 
 For many simple, single file projects, you may find it inconvenient to write a complete `Dockerfile`. In such cases, you can run a Ruby script by using the Ruby Docker image directly:
 
 ```console
-$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp %%IMAGE%%:2.1 ruby your-daemon-or-script.rb
+$ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp %%IMAGE%%:2.5 ruby your-daemon-or-script.rb
 ```
 
 ## Encoding