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README.markdown

README.markdown

Puppet LVM Module

Provides Logical Resource Management (LVM) features for Puppet.

Usage

This module provides four resource types (and associated providers): volume_group, logical_volume, physical_volume, and filesystem.

The basic dependency graph needed to define a working logical volume looks something like:

filesystem -> logical_volume -> volume_group -> physical_volume(s)

Here's a simple working example:

physical_volume { "/dev/hdc":
    ensure => present
}
volume_group { "myvg":
    ensure => present,
    physical_volumes => "/dev/hdc"
}
logical_volume { "mylv":
    ensure => present,
    volume_group => "myvg"
    size => "20G"
}
filesystem { "/dev/myvg/mylv":
    ensure => "ext3",
    logical_volume => "mylv"
}

This simple 1 physical volume, 1 volume group, 1 logical volume case is provided as a simple volume definition, as well. The above could be shortened to be:

volume("myvg", "/dev/hdc", "mylv", "ext3", "20G")

If you need a more complex configuration, you'll need to build the resources out yourself.

Limitations

Namespacing

Due to puppet's lack of composite keys for resources, you currently cannot define two logical_volume resources with the same name but a different volume_group.

Removing Physical Volumes

You should not remove a physical_volume from a volume_group without ensuring the physical volume is no longer in use by a logical volume (and possibly doing a data migration with the pvmove executable).

Removing a physical_volume from a volume_group resource will cause the pvreduce to be executed -- no attempt is made to ensure pvreduce does not attempt to remove a physical volume in-use.

Resizing Logical Volumes

Currently when defining logical_volume resources the size is only used during creation. Resizing the logical volume (which normally consists of modifying the logical volume, unmounting the filesystem, resizing the filesystem, and remounting) is not currently supported.

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