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Update parent image glossary definition (#9617) 

All Dockerfiles must have a FROM statement (as confirmed in the [builder documentation](https://docs.docker.com/engine/reference/builder/#from)). This change clarifies the phrasing within parent image. See [this stackoverflow post](https://stackoverflow.com/q/58330046/596285) for how the current phrasing has confused others.
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Brandon Mitchell 2019-10-11 17:55:37 -04:00 committed by lena-larionova
parent ca95648572
commit b6d42e1d12
1 changed files with 2 additions and 2 deletions
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_data/glossary.yaml
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@ -218,8 +218,8 @@ overlay storage driver: |
It is supported by the Docker daemon as a storage driver.
parent image: |
An image's **parent image** is the image designated in the `FROM` directive
in the image's Dockerfile. All subsequent commands are applied to this parent
image. A Dockerfile with no `FROM` directive has no parent image, and is called
in the image's Dockerfile. All subsequent commands are based on this parent
image. A Dockerfile with the `FROM scratch` directive has no parent image, and is called
a **base image**.
persistent storage: |
Persistent storage or volume storage provides a way for a user to add a persistent layer to the running container's file system. This persistent layer could live on the container host or an external device. The lifecycle of this persistent layer is not connected to the lifecycle of the container, allowing a user to retain state.