OpenVZ Virtuozzo Containers Wiki - User contributions [en]

Prl-disk-tool for Virtuozzo 7

2015-11-05T12:04:53Z

Mperevedentsev:

'''1. Feature'''

prl_disk_tool for Virtuozzo 7

'''2. Description'''

The package prl-disk-tool (binary /usr/sbin/prl_disk_tool)
is used to manage virtual machine and container disk images
can perform the following operations:

1. ''resize --size ...'' : Resize image (in-place)

2. ''resize --size ... --resize_partition'' : Resize image and last partition to fit (copying)

3. ''resize --info'' : Display resize estimates (current size, minimum size, minimum size w/o resizing last partition) - '''VM only'''

4. ''compact'' : Compact image to occupy less space on host disk. (in-place)

5. ''compact --info'' : Display compact estimates (block count, allocated, used) - '''VM only'''

6. ''merge'' : Merge internal snapshots of image (in-place) - '''VM only'''

7. ''merge --external'' : Merge external snapshot of image (in-place) - '''VM only'''

8. ''convert [--plain | --expanding]'' : Convert image between plain and expanding modes (copying) - '''VM only'''

prl_disk_tool uses libguestfs, qemu-img to work.

The user has to install additional packages to use part of functionality:

* ''prl-disk-tool resize --info'' (last partition: btrfs) → btrfs-progs >= 4.2 (already in repo)
* ''prl-disk-tool resize {--info,--resize_partition}'' (last partition: ntfs) → libguestfs-winsupport (already in repo)
* ''prl-disk-tool compact {--info,}'' (exists partition with ntfs) → libguestfs-winsupport

prl_disk_tool locks an image passed as argument by flock(). So only multiple
reads (''{compact,resize} --info'') OR a single write (others) are allowed.

FS-aware functions (''resize {--resize_partition|--info}, compact [--info]'') work
for ext2/ext3/ext4/ntfs/btrfs/xfs.

prl_disk_tool uses qemu-img to perform fs-unaware operations. It is more
powerful than qemu-img due to fs-aware operations performed with libguestfs.

The main purpose of prl_disk_tool is to automate some frequent operations.

'''3. Products'''

Virtuozzo 7 beta2

Packages:

* prl-disk-tool >= 7.0.5
* libguestfs >= 1.28.1-1.18
* btrfs-progs >= 4.2 (optional)
* libguestfs-winsupport >= 7.2.1 (optional)
* libguestfs-xfs (in dependencies)
* qemu-img >= 1.5.3-86

'''4. Testing'''

Need to test the following cases:

* All functions work for qcow2 images.
* Functions not tagged as '''VM only''' work for ploop images.
* FS-aware functions (''resize --resize_partition|--info, compact [--info]'') work for ext2/ext3/ext4/ntfs/btrfs/xfs.

'''5. Known issues'''

* ''resize --resize_partition'' should be implemented in-place (due tolimitations of qcow2, only for expanding)
* all modifying operations have ''--dry-run'' option to not modify an image. The image is still opened for write, and exclusive lock is acquired.
* only listed filesystems are supported
* virt-resize, used by ''resize --resize_partition'', leaves an empty block of ~3M at the end of image.
* ''convert --plain'' fallocate()s space inaccurately (due to unawareness of qcow2 internal structures).
* ''resize [expand]'' after ''convert --plain'' does not force allocation of new (bigger) chunk of space (we do not keep image type (plain/expanding) for now - so it is impossible to determine whether we should allocate space outside of ''convert'' operation)

Prl-disk-tool for Virtuozzo 7

2015-11-05T12:03:03Z

Mperevedentsev: Created page with "'''1. Feature''' prl_disk_tool for Virtuozzo 7 '''2. Description''' The package prl-disk-tool (binary /usr/sbin/prl_disk_tool) is used to manage virtual machine and contain..."

'''1. Feature'''

prl_disk_tool for Virtuozzo 7

'''2. Description'''

The package prl-disk-tool (binary /usr/sbin/prl_disk_tool)
is used to manage virtual machine and container disk images
can perform the following operations:

1. ''resize --size ...'' : Resize image (in-place)

2. ''resize --size ... --resize_partition'' : Resize image and last partition to fit (copying)

3. ''resize --info'' : Display resize estimates (current size, minimum size, minimum size w/o resizing last partition) - '''VM only'''

4. ''compact'' : Compact image to occupy less space on host disk. (in-place)

5. ''compact --info'' : Display compact estimates (block count, allocated, used) - '''VM only'''

6. ''merge'' : Merge internal snapshots of image (in-place) - '''VM only'''

7. ''merge --external'' : Merge external snapshot of image (in-place) - '''VM only'''

8. ''convert [--plain | --expanding]'' : Convert image between plain and expanding modes (copying) - '''VM only'''

prl_disk_tool uses libguestfs, qemu-img to work.

The user has to install additional packages to use part of functionality:

''prl-disk-tool resize --info'' (last partition: btrfs) -> btrfs-progs >= 4.2
(already in repo)
''prl-disk-tool resize {--info,--resize_partition}'' (last partition: ntfs) ->
libguestfs-winsupport (already in repo)
''prl-disk-tool compact {--info,}'' (exists partition with ntfs) ->
libguestfs-winsupport

prl_disk_tool locks an image passed as argument by flock(). So only multiple
reads (''{compact,resize} --info'') OR a single write (others) are allowed.

FS-aware functions (''resize {--resize_partition|--info}, compact [--info]'') work
for ext2/ext3/ext4/ntfs/btrfs/xfs.

prl_disk_tool uses qemu-img to perform fs-unaware operations. It is more
powerful than qemu-img due to fs-aware operations performed with libguestfs.

The main purpose of prl_disk_tool is to automate some frequent operations.

'''3. Products'''

Virtuozzo 7 beta2

Packages:

* prl-disk-tool >= 7.0.5
* libguestfs >= 1.28.1-1.18
* btrfs-progs >= 4.2 (optional)
* libguestfs-winsupport >= 7.2.1 (optional)
* libguestfs-xfs (in dependencies)
* qemu-img >= 1.5.3-86

'''4. Testing'''

Need to test the following cases:

* All functions work for qcow2 images.
* Functions not tagged as '''VM only''' work for ploop images.
* FS-aware functions (''resize --resize_partition|--info, compact [--info]'') work for ext2/ext3/ext4/ntfs/btrfs/xfs.

'''5. Known issues'''

* ''resize --resize_partition'' should be implemented in-place (due tolimitations of qcow2, only for expanding)
* all modifying operations have ''--dry-run'' option to not modify an image. The image is still opened for write, and exclusive lock is acquired.
* only listed filesystems are supported
* virt-resize, used by ''resize --resize_partition'', leaves an empty block of ~3M at the end of image.
* ''convert --plain'' fallocate()s space inaccurately (due to unawareness of qcow2 internal structures).
* ''resize [expand]'' after ''convert --plain'' does not force allocation of new (bigger) chunk of space (we do not keep image type (plain/expanding) for now - so it is impossible to determine whether we should allocate space outside of ''convert'' operation)

QA TODO list

2015-11-05T10:40:39Z

Mperevedentsev: /* OpenVZ/Virtuozzo 7 */

=== OpenVZ/Virtuozzo 7 ===

OpenVZ features in testing are below:

* [[Start CT in a new user namespace: 1:1 user mapping]]
* [[Changes in network shaping for Virtuozzo 7]]
* [[Upgrade script from OpenVZ to Virtuozzo 7]]
* [[Memory Management in VZ7]]
* [[prl-disk-tool for Virtuozzo 7]]

Features are in released OpenVZ versions:

* None

=== Legacy OpenVZ ===

OpenVZ features in testing are below:

* None

Features are in released OpenVZ versions:

* [[IPsec|IPsec]] inside container
* [[Docker_inside_CT|Docker inside CT]]

[[Category: QA]]

QA TODO list

2015-11-05T10:39:25Z

Mperevedentsev: /* OpenVZ/Virtuozzo 7 */

=== OpenVZ/Virtuozzo 7 ===

OpenVZ features in testing are below:

* [[Start CT in a new user namespace: 1:1 user mapping]]
* [[Changes in network shaping for Virtuozzo 7]]
* [[Upgrade script from OpenVZ to Virtuozzo 7]]
* [[Memory Management in VZ7]]
* [[prl_disk_tool for Virtuozzo 7]]

Features are in released OpenVZ versions:

* None

=== Legacy OpenVZ ===

OpenVZ features in testing are below:

* None

Features are in released OpenVZ versions:

* [[IPsec|IPsec]] inside container
* [[Docker_inside_CT|Docker inside CT]]

[[Category: QA]]