diff --git a/README.rst b/README.rst
index bc963e8..3e38833 100644
--- a/README.rst
+++ b/README.rst
@@ -540,6 +540,9 @@
             kernel_package:
               enabled: true
               value 'linux-image-virtual-hwe-16.04'
+            # disable cloud-init rootfs resize to prserve disk size configured by MAAS
+            rootfs_resize:
+              disabled: true
 
 Single MAAS cluster service [multiple racks]
 
diff --git a/maas/files/curtin_userdata_amd64_generic_xenial b/maas/files/curtin_userdata_amd64_generic_xenial
index afc18a5..45395b5 100644
--- a/maas/files/curtin_userdata_amd64_generic_xenial
+++ b/maas/files/curtin_userdata_amd64_generic_xenial
@@ -48,6 +48,10 @@
   salt_10_recon_max: ["curtin", "in-target", "--", "sh", "-c", "echo 'recon_max: 60000' >> /etc/salt/minion.d/minion.conf"]
   salt_11_recon_randomize: ["curtin", "in-target", "--", "sh", "-c", "echo 'recon_randomize: True' >> /etc/salt/minion.d/minion.conf"]
   salt_12_auth_timeout: ["curtin", "in-target", "--", "sh", "-c", "echo 'auth_timeout: 60' >> /etc/salt/minion.d/minion.conf"]
+{%- if salt['pillar.get']('maas:cluster:curtin_vars:amd64:xenial:rootfs_resize:disabled')|default(false) %}
+
+  cloudinit_01_disable_rootfs_resize: ["curtin", "in-target", "--", "sh", "-c", "echo 'resize_rootfs: false' > /etc/cloud/cloud.cfg.d/02_resizeroot.cfg"]
+{% endif %}
 
 {% raw %}
 {{if third_party_drivers and driver}}