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Explain the Python onbuild variant

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Ekevoo
2015-10-07 20:19:19 -04:00
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## `%%REPO%%:onbuild`
This image makes building derivative images easier. For most use cases, creating a `Dockerfile` in the base of your project directory with the line `FROM %%REPO%%:onbuild` will be enough to create a stand-alone image for your project.
This image feeds your `requirements.txt` file automatically to `pip` in order to make building derivative images easier. For most use cases, creating a `Dockerfile` in the base of your project directory with the line `FROM %%REPO%%:onbuild` will be enough to create a stand-alone image for your project.
While the `onbuild` variant is really useful for "getting off the ground running" (zero to Dockerized in a short period of time), it's not recommended for long-term usage within a project due to the lack of control over *when* the `ONBUILD` triggers fire (see also [`docker/docker#5714`](https://github.com/docker/docker/issues/5714), [`docker/docker#8240`](https://github.com/docker/docker/issues/8240), [`docker/docker#11917`](https://github.com/docker/docker/issues/11917)).