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Disable qcow2 support by default

qcow2 images can grow while virtual machines are being executed, which
can lead to disk space shortage if storage resources are scarce.

When administrators enabled this feature, they should monitor their disk
space utilization.
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1 parent c761861 commit 2556c49180bdfc632fbacfbed068e6baabd04f96 @priteau priteau committed Jul 17, 2012
Showing with 6 additions and 1 deletion.
  1. +6 −1 control/etc/workspace-control/mount.conf
7 control/etc/workspace-control/mount.conf
@@ -44,10 +44,15 @@ tmpdir: tmp
fdisk: /sbin/fdisk
+# qcow2 is a virtual machine image format with many features, notably delayed
+# allocation. qcow2 images can dynamically grow while the virtual machine is
+# being executed. As such, Nimbus IaaS administrators should be careful and
+# monitor disk usage when enabling qcow2 support.
# qemu-nbd is used when an HD image is in qcow2 format. qemu-nbd will be used
# to attach the HD image as an nbd device, which allows to mount the root
# partition inside.
# If this setting is empty or missing, qcow2 support will be disabled.
-qemu_nbd: /usr/bin/qemu-nbd
+#qemu_nbd: /usr/bin/qemu-nbd

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