[Bug 1374115] Re: Allow cloud-config to modify partitioning and mount point of temporary resource disk in Azure

[trialotto]

@Stephen,

The mount location CAN be changed by setting

- ResourceDisk.Format=y (instead of "n") AND
- ResourceDisk.MountPoint=/opt (or any other directory, instead of /mnt)

in waagent.conf.

The change becomes effective after a shutdown and start-up sequence (and
I assume the same applies to a normal restart).

The mount location cannot be changed, if and only if
ResourceDisk.Format=n.

Also note that the ResourceDisk.MountPoint variable in waagent.conf can
be blank, in which case the standard mount point will be used by cloud-
init, being "/mnt".

All the above already leaves the question why ResourceDisk.MountPoint
should be present in waagent.conf, given that

- most of the work is done by cloud-init and cloud-config settings, 
- the ResourceDisk.MountPoint is only working in combination with ResourceDisk.Format=y, 
- the specification of mount points should not be limited to only the resource (ephemeral) disk, 

and so on.

In essence, the Azure Datasource, used by cloud-init, should be able to
push some flexible configuration of variables to cloud-init.

As a result, a desire to change many variables will require that

1 - a (huge) number of variables is added to waagent.conf, with corresponding code in waagent script, OR
2 - the Azure Datasource should be WRITEABLE, allowing the change of cloud-config settings without specifying CustomData at provisioning time and (therefore) the changed cloud-config settings becoming effective at shut-down and start-up sequences, 

and, to be honest, the proper and efficient way of doing things should
be method 2.

Kind regards...

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https://bugs.launchpad.net/bugs/1374115

Title:
  Allow cloud-config to modify partitioning and mount point of temporary
  resource disk in Azure

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