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Correct errors about data propagation into volumes and bind mounts (#5058)

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Yaroslav Mitsynskiy 2017-10-21 00:19:06 +03:00 committed by Misty Stanley-Jones
parent 142aee0354
commit 3888065197
1 changed files with 9 additions and 6 deletions
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15
engine/admin/volumes/index.md
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@ -156,16 +156,19 @@ needs to write a large volume of non-persistent state data.
If you use either bind mounts or volumes, keep the following in mind: If you use either bind mounts or volumes, keep the following in mind:
- If the container's image contains data at the mount point, this data will be - If you mount an **empty volume** into a directory in the container in which files
propagated into the bind mount or volume. This is a good way to pre-populate or directories exist, these files or directories will be propagated (copied)
data that the Docker host needs (in the case of bind mounts) or that another into the volume. Similarly, if you start a container and specify a volume which
container needs (in the case of volumes). does not already exist, an empty volume is created for you.
This is a good way to pre-populate data that another container needs.
- If you mount a bind mount or volume into a directory in the container in which - If you mount a **bind mount or non-empty volume** into a directory in the container
files or directories have already been written, these files or directories are in which some files or directories exist, these files or directories are
obscured by the mount, just as if you saved files into `/mnt` on a Linux host obscured by the mount, just as if you saved files into `/mnt` on a Linux host
and then mounted a USB drive into `/mnt`. The contents of `/mnt` would be and then mounted a USB drive into `/mnt`. The contents of `/mnt` would be
obscured by the contents of the USB drive until the USB drive were unmounted. obscured by the contents of the USB drive until the USB drive were unmounted.
The obscured files are not removed or altered, but are not accessible while the
bind mount or volume is mounted.
## Next steps ## Next steps