[Bug 1491102] Re: add mdadm and lvm2 to cloud image

[Scott Moser]

** Summary changed:

- [FFE] add mdadm and lvm2 to cloud image
+ add mdadm and lvm2 to cloud image

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https://bugs.launchpad.net/bugs/1491102

Title:
  add mdadm and lvm2 to cloud image

Status in lvm2 package in Ubuntu:
  New
Status in mdadm package in Ubuntu:
  New

Bug description:
  In order to make use of raid and lvm functionality that is being added
  to curtin, we need to have mdadm and lvm2 packages available.  curtin
  is able to install the packages, but that is less desireable than
  having them already available inside the image.

  This bug is a feature freeze exception to add mdadm and lvm2 to the
  wily cloud-image seed [1].

  == general risks ==
  Adding these packages will add ~ 5M total to the cloud image installed system.

  == mdadm risks ==
  mdadm recommends 'default-mta', and cloud-images have always been built with 'recommends by default'. So addition of this package to the cloud image means also adding an unconfigured mta (postifx). There is some discussion on this topic from ubuntu-devel at [2].

  As a point of reference here, I did a server ISO install with raid,
  and found that 'default-mta' does *not* get installed.  The installer
  must select to install mdadm but not pull in its Recommends.

  Additionally, its possible presence of this package could cause
  issues.  It installs udev rules that could misfire.  Any such issues
  encountered really should be fixed anyway, rather than just hoped to
  not be hit.

  == lvm2 risks ==
  Similarly to mdadm, lvm adds udev rules and could raise cause problems.
  As with mdadm, any such issues really ought to be fixed any way.

  == general information ==
  The reason this is proposed for inclusion into the cloud-image is 2 fold
  a.) the maas ephemeral images are created from the cloud-image.  so packages in the cloud-image are then available in the install environment for maas.  We dont want to add differences between these installation sets.
  b.) it is not unreasonable to add these packages to the cloud image.  It is not at all farfetched that someone would use lvm or raid in a "cloud" environment, so they're not entirely wasted space there.

  --
  [1] http://bazaar.launchpad.net/~ubuntu-core-dev/ubuntu-seeds/ubuntu.wily/view/head:/cloud-image
  [2] http://irclogs.ubuntu.com/2015/08/06/%23ubuntu-devel.html#t22:53

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