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Cloud-init supports the creation of simple partition tables and file systems
on devices.
Default disk definitions for AWS
--------------------------------
(Not implemented yet, but provided for future documentation)
disk_setup:
ephmeral0:
type: 'mbr'
layout: True
overwrite: False
fs_setup:
- label: None,
filesystem: ext3
device: ephemeral0
partition: auto
Default disk definitions for Windows Azure
------------------------------------------
device_aliases: {'ephemeral0': '/dev/sdb'}
disk_setup:
ephemeral0:
type: mbr
layout: True
overwrite: False
fs_setup:
- label: ephemeral0
filesystem: ext4
device: ephemeral0
partition: auto
Default disk definitions for SmartOS
------------------------------------
device_aliases: {'ephemeral0': '/dev/sdb'}
disk_setup:
ephemeral0:
type: mbr
layout: False
overwrite: False
fs_setup:
- label: ephemeral0
filesystem: ext3
device: ephemeral0
partition: auto
Cavaut for SmartOS: if ephemeral disk is not defined, then the disk will
not be automatically added to the mounts.
The default definition is used to make sure that the ephemeral storage is
setup properly.
"disk_setup": disk partitioning
--------------------------------
The disk_setup directive instructs Cloud-init to partition a disk. The format is:
disk_setup:
ephmeral0:
type: 'mbr'
layout: 'auto'
/dev/xvdh:
type: 'mbr'
layout:
- 33
- [33, 82]
- 33
overwrite: True
The format is a list of dicts of dicts. The first value is the name of the
device and the subsequent values define how to create and layout the partition.
The general format is:
disk_setup:
<DEVICE>:
type: 'mbr'
layout: <LAYOUT|BOOL>
overwrite: <BOOL>
Where:
<DEVICE>: The name of the device. 'ephemeralX' and 'swap' are special
values which are specific to the cloud. For these devices
Cloud-init will look up what the real devices is and then
use it.
For other devices, the kernel device name is used. At this
time only simply kernel devices are supported, meaning
that device mapper and other targets may not work.
Note: At this time, there is no handling or setup of
device mapper targets.
type=<TYPE>: Currently the following are supported:
'mbr': default and setups a MS-DOS partition table
Note: At this time only 'mbr' partition tables are allowed.
It is anticipated in the future that we'll have GPT as
option in the future, or even "RAID" to create a mdadm
RAID.
layout={...}: The device layout. This is a list of values, with the
percentage of disk that partition will take.
Valid options are:
[<SIZE>, [<SIZE>, <PART_TYPE]]
Where <SIZE> is the _percentage_ of the disk to use, while
<PART_TYPE> is the numerical value of the partition type.
The following setups two partitions, with the first
partition having a swap label, taking 1/3 of the disk space
and the remainder being used as the second partition.
/dev/xvdh':
type: 'mbr'
layout:
- [33,82]
- 66
overwrite: True
When layout is "true" it means single partition the entire
device.
When layout is "false" it means don't partition or ignore
existing partitioning.
If layout is set to "true" and overwrite is set to "false",
it will skip partitioning the device without a failure.
overwrite=<BOOL>: This describes whether to ride with saftey's on and
everything holstered.
'false' is the default, which means that:
1. The device will be checked for a partition table
2. The device will be checked for a file system
3. If either a partition of file system is found, then
the operation will be _skipped_.
'true' is cowboy mode. There are no checks and things are
done blindly. USE with caution, you can do things you
really, really don't want to do.
fs_setup: Setup the file system
-------------------------------
fs_setup describes the how the file systems are supposed to look.
fs_setup:
- label: ephemeral0
filesystem: 'ext3'
device: 'ephemeral0'
partition: 'auto'
- label: mylabl2
filesystem: 'ext4'
device: '/dev/xvda1'
- special:
cmd: mkfs -t %(FILESYSTEM)s -L %(LABEL)s %(DEVICE)s
filesystem: 'btrfs'
device: '/dev/xvdh'
The general format is:
fs_setup:
- label: <LABEL>
filesystem: <FS_TYPE>
device: <DEVICE>
partition: <PART_VALUE>
overwrite: <OVERWRITE>
Where:
<LABEL>: The file system label to be used. If set to None, no label is
used.
<FS_TYPE>: The file system type. It is assumed that the there
will be a "mkfs.<FS_TYPE>" that behaves likes "mkfs". On a standard
Ubuntu Cloud Image, this means that you have the option of ext{2,3,4},
and vfat by default.
<DEVICE>: The device name. Special names of 'ephemeralX' or 'swap'
are allowed and the actual device is acquired from the cloud datasource.
When using 'ephemeralX' (i.e. ephemeral0), make sure to leave the
label as 'ephemeralX' otherwise there may be issues with the mounting
of the ephemeral storage layer.
<PART_VALUE>: The valid options are:
"auto|any": tell cloud-init not to care whether there is a partition
or not. Auto will use the first partition that does not contain a
file system already. In the absence of a partition table, it will
put it directly on the disk.
"auto": If a file system that matches the specification in terms of
label, type and device, then cloud-init will skip the creation of
the file system.
"any": If a file system that matches the file system type and device,
then cloud-init will skip the creation of the file system.
Devices are selected based on first-detected, starting with partitions
and then the raw disk. Consider the following:
NAME FSTYPE LABEL
xvdb
├─xvdb1 ext4
├─xvdb2
├─xvdb3 btrfs test
└─xvdb4 ext4 test
If you ask for 'auto', label of 'test, and file system of 'ext4'
then cloud-init will select the 2nd partition, even though there
is a partition match at the 4th partition.
If you ask for 'any' and a label of 'test', then cloud-init will
select the 1st partition.
If you ask for 'auto' and don't define label, then cloud-init will
select the 1st partition.
In general, if you have a specific partition configuration in mind,
you should define either the device or the partition number. 'auto'
and 'any' are specifically intended for formating ephemeral storage or
for simple schemes.
"none": Put the file system directly on the device.
<NUM>: where NUM is the actual partition number.
<OVERWRITE>: Defines whether or not to overwrite any existing
filesystem.
"true": Indiscriminately destroy any pre-existing file system. Use at
your own peril.
"false": If an existing file system exists, skip the creation.
Behavior Caveat: The default behavior is to _check_ if the file system exists.
If a file system matches the specification, then the operation is a no-op.
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