Update cAdvisor with moved docker root on AWS

We set up a symlink now, and we also pass docker_root into the kubelet.

The symlink is probably sufficient, but doing both feels safer.

cluster/aws/templates/format-disks.sh

@@ -60,7 +60,12 @@ else
   mount -t btrfs ${block_devices[0]} /mnt
 
   # Move docker to /mnt if we have it
+  if [[ -d /var/lib/docker ]]; then
+    mv /var/lib/docker /mnt/
+  fi
   mkdir -p /mnt/docker
+  ln -s /mnt/docker /var/lib/docker
+  DOCKER_ROOT="/mnt/docker"
   DOCKER_OPTS="${DOCKER_OPTS} -g /mnt/docker"
 fi
 

cluster/aws/templates/salt-master.sh

@@ -26,6 +26,18 @@ grains:
   cbr-cidr: "${MASTER_IP_RANGE}"
 EOF
 
+if [[ -n "${DOCKER_OPTS}" ]]; then
+  cat <<EOF >>/etc/salt/minion.d/grains.conf
+  docker_opts: '$(echo "$DOCKER_OPTS" | sed -e "s/'/''/g")'
+EOF
+fi
+
+if [[ -n "${DOCKER_ROOT}" ]]; then
+  cat <<EOF >>/etc/salt/minion.d/grains.conf
+  docker_root: '$(echo "$DOCKER_ROOT" | sed -e "s/'/''/g")'
+EOF
+fi
+
 cat <<EOF > /etc/aws.conf
 [Global]
 Zone = ${ZONE}

cluster/aws/templates/salt-minion.sh

@@ -31,12 +31,19 @@ grains:
 EOF
 
 
-if [[ -n "{DOCKER_OPTS}" ]]; then
+if [[ -n "${DOCKER_OPTS}" ]]; then
   cat <<EOF >>/etc/salt/minion.d/grains.conf
   docker_opts: '$(echo "$DOCKER_OPTS" | sed -e "s/'/''/g")'
 EOF
 fi
 
+if [[ -n "${DOCKER_ROOT}" ]]; then
+  cat <<EOF >>/etc/salt/minion.d/grains.conf
+  docker_root: '$(echo "$DOCKER_ROOT" | sed -e "s/'/''/g")'
+EOF
+fi
+
+
 # Install Salt
 #
 # We specify -X to avoid a race condition that can cause minion failure to