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Rephrase and try to be clearer regarding perl:onbuild 

Try to distinguish making the image for `perl:onbuild` and using as the
base image for the project.
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Zak B. Elep 2017-07-29 10:24:13 +08:00
parent a488042cc4
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@ -34,7 +34,7 @@ $ docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/
## Creating a reusable `perl:onbuild` image for Perl projects ## Creating a reusable `perl:onbuild` image for Perl projects
Suppose you have a project that uses [Carton](https://metacpan.org/pod/Carton) to manage Perl dependencies. You can write a `Dockerfile` that makes use of the [ONBUILD](https://docs.docker.com/engine/reference/builder/#onbuild) instruction like this: Suppose you have a project that uses [Carton](https://metacpan.org/pod/Carton) to manage Perl dependencies. You can create a `perl:onbuild` image that makes use of the [ONBUILD](https://docs.docker.com/engine/reference/builder/#onbuild) instruction in its `Dockerfile`, like this:
```dockerfile ```dockerfile
FROM perl:5.26 FROM perl:5.26
@ -49,4 +49,4 @@ ONBUILD RUN carton install
ONBUILD COPY . /usr/src/app ONBUILD COPY . /usr/src/app
``` ```
Building this as a `perl:onbuild` image can let you reduce your project's `Dockerfile` into a single line of `FROM perl:onbuild`, which may be enough to build a stand-alone image for your project. Then, in your project, you can now reduce your project's `Dockerfile` into a single line of `FROM perl:onbuild`, which may be enough to build a stand-alone image.