Add use case for China registry mirror (docker#3682)

Jim Galasyn · web-flow · commit 514d85877432 · 2017-06-22T13:08:43.000-07:00
diff --git a/registry/recipes/mirror.md b/registry/recipes/mirror.md
@@ -100,3 +100,33 @@ to make the change persistent.
 ```
 
 Save the file and restart Docker for the change to take effect.
+
+## Use case: the China registry mirror
+
+The URL of the registry mirror for China is `registry.docker-cn.com`. You can
+pull images from this mirror just like you do for other registries by
+specifying the full path, including the registry, in your `docker pull`
+command, for example:
+
+```bash
+$ docker pull registry.docker-cn.com/library/ubuntu
+```
+
+You can configure the Docker daemon with the `--registry-mirror` startup
+parameter:
+
+```bash
+$ docker --registry-mirror=https://registry.docker-cn.com -d
+```
+
+Or you can add "https://registry.docker-cn.com" to the `registry-mirrors`
+array in `/etc/docker/daemon.json` to pull from the China registry mirror
+by default.  
+
+```json
+{
+  "registry-mirrors": ["https://registry.docker-cn.com"]
+}
+```
+
+Save the file and restart Docker for the change to take effect.
