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Merge pull request #761 from alanfranz/patch-1 

Clarify what's required in order to use Centos images with overlayfs
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Tianon Gravi 2016-12-10 10:05:56 -08:00 committed by GitHub
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@ -20,6 +20,10 @@ Additionally, images with minor version tags that correspond to install media ar
For example: `docker pull centos:5.11` or `docker pull centos:6.6`
## Overlayfs and yum
Recent Docker versions support the [overlayfs](https://docs.docker.com/engine/userguide/storagedriver/overlayfs-driver/) backend, which is enabled by default on most distros supporting it from Docker 1.13 onwards. On Centos 6 and 7, **that backend requires yum-plugin-ovl to be installed and enabled**; while it is installed by default in recent centos images, make it sure you retain the `plugins=1` option in `/etc/yum.conf` if you update that file; otherwise, you may encounter errors related to rpmdb checksum failure - see [Docker ticket 10180](https://github.com/docker/docker/issues/10180) for more details.
# Package documentation
By default, the CentOS containers are built using yum's `nodocs` option, which helps reduce the size of the image. If you install a package and discover files missing, please comment out the line `tsflags=nodocs` in `/etc/yum.conf` and reinstall your package.