doc(quickstart.md,configuring-object-storage.md): start documenting object storage configs

Author: arschles

docs/src/installing-deis/configuring-object-storage.md

@@ -0,0 +1,26 @@
+# Configure Object Storage
+
+A variety of Deis components rely on an object storage system to do their work. These components are:
+
+- [workflow](https://github.com/deis/workflow)
+- [builder](https://github.com/deis/builder)
+- [slugbuilder](https://github.com/deis/slugbuilder)
+- [slugrunner](https://github.com/deis/slugrunner)
+- [registry](https://github.com/deis/registry)
+
+These components are built flexibly, so they can work out of the box with almost any system that is compatible with the [S3 API](http://docs.aws.amazon.com/AmazonS3/latest/API/APIRest.html).
+
+# Minio
+
+Additionally, Deis ships with a [Minio](http://minio.io) [component](https://github.com/deis/minio). This component runs as a Kubernetes service, and the components listed above are configured to automatically look for that service and use it as object storage if it's available.
+
+# Telling Deis What to Use
+
+The Deis components determine what object storage system to use via environment variables that you set up:
+
+TODO: list the lookup order
+
+# Limitations
+
+- In some cases, the minio service must be started up before other components, so that they see the Minio service's environment variables. If you use [helm](https://github.com/helm/helm) to install deis, this ordering won't be ensured. (builder, slugbuilder and slugrunner are fine)
+- Registry doesn't currently automatically look up the minio service, nor will it look for other storage env vars.

docs/src/installing-deis/quickstart.md

@@ -26,3 +26,4 @@ Now that you've finished provisioning a cluster, please [Install the Deis Platfo
 [configuring dns]: ../managing-deis/configuring-dns.md
 [install deis]: installing-the-deis-platform.md
 [system requirements]: system-requirements.md
+[configuring object storage]: configuring-object-storage.md