described needed steps for shared mount propagation

docs/getting-started-guides/docker.md

@@ -16,26 +16,48 @@ Here's a diagram of what the final result will look like:
 
 **Note: These steps have not been tested with the [Docker For Mac or Docker For Windows beta programs](https://blog.docker.com/2016/03/docker-for-mac-windows-beta/).**
 
-1. You need to have docker installed on one machine.
+1. You need to have Docker version >= "1.10" installed on the machine.
-2. Decide what Kubernetes version to use. Set the `${K8S_VERSION}` variable to
+2. Enable mount propagation. Hyperkube is running in a container which has to mount volumes for other containers, for example in case of persistent storage. The required steps depend on the init system.
-   a released version of Kubernetes >= "v1.2.0". If you'd like to use the current stable version of Kubernetes, run the following:
+
+
+  In case of **systemd**, change MountFlags in the Docker unit file to shared.
+  ```shell
+    DOCKER_CONF=$(systemctl cat docker | head -1 | awk '{print $2}')
+    sed -i.bak 's/^\(MountFlags=\).*/\1shared/' $DOCKER_CONF
+    systemctl daemon-reload
+    systemctl restart docker
+  ```
+
+  **Otherwise**, manually set the mount point used by Hyperkube to be shared:
+  ```shell
+    mkdir -p /var/lib/kubelet
+    mount --bind /var/lib/kubelet /var/lib/kubelet
+    mount --make-shared /var/lib/kubelet
+  ```
+
+
+### Run it
+
+1. Decide which Kubernetes version to use. Set the `${K8S_VERSION}` variable to a version of Kubernetes >= "v1.2.0".
+
+
+  If you'd like to use the current **stable** version of Kubernetes, run the following:
 
   ```sh
   export K8S_VERSION=$(curl -sS https://storage.googleapis.com/kubernetes-release/release/stable.txt)
   ```
 
-and for the latest available version (including unstable releases):
+  and for the **latest** available version (including unstable releases):
 
   ```sh
   export K8S_VERSION=$(curl -sS https://storage.googleapis.com/kubernetes-release/release/latest.txt)
   ```
 
-### Run it
+2. Start Hyperkube
 
   ```shell
   export ARCH=amd64
   docker run -d \
-    --volume=/:/rootfs:ro \
       --volume=/sys:/sys:rw \
       --volume=/var/lib/docker/:/var/lib/docker:rw \
       --volume=/var/lib/kubelet/:/var/lib/kubelet:rw,shared \
@@ -45,7 +67,6 @@ docker run -d \
       --privileged \
       gcr.io/google_containers/hyperkube-${ARCH}:${K8S_VERSION} \
       /hyperkube kubelet \
-        --containerized \
           --hostname-override=127.0.0.1 \
           --api-servers=http://localhost:8080 \
           --config=/etc/kubernetes/manifests \
@@ -229,4 +250,3 @@ For support level information on all solutions, see the [Table of solutions](/do
 
 Please see the [Kubernetes docs](/docs/) for more details on administering
 and using a Kubernetes cluster.
-