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From: Aaron Lauterer <a.lauterer@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Fri, 2 Apr 2021 12:19:18 +0200
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Subject: [pve-devel] [PATCH v6 series 0/5] disk reassign: add new feature
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This series implements a new feature which allows users to easily
reassign disks between VMs. Currently this is only possible with one of
the following manual steps:
* rename the disk image/file and do a `qm rescan`
* configure the disk manually and use the old image name, having an
image for VM A assigned to VM B
The latter can cause unexpected behavior because PVE expects that the
VMID in a disk name always corresponds to the VM it is assigned to. Thus
when a disk, original from VM A was manually configured as disk for VM B
it happens that, when deleting VM A, the disk in question will be
deleted as well because it still had the VMID of VM A in it's name.
To issue a reassign from the CLI run:
qm reassign_disk <source VMID> <target VMID> <drive name>
where <drive name> is the config key of the disk, e.g. ide0, scsi1 and so
on.
The following storage types are implemented at the moment:
* dir based ones
* directory
* NFS
* CIFS
* gluster
* ZFS
* (thin) LVM
* Ceph RBD
v5 -> v6:
* guard Replication snapshot cleanup
* add permission check for target vmid
* changed regex to match unused keys better
* refactor dir based feature check to reduce code repetition
v4 -> v5:
* rebase on current master
* reorder patches
* rename `drive_key` to `drive_name`
thanks @Dominic for pointing out that there already are a lot of
different names in use for this [0] and not to invent another one ;)
* implemented suggested changes from Fabian [1][2]. More directly in the
patches themselves
v3 -> v4:
* revert intermediate storage plugin for directory based plugins
* add a `die "not supported"` method in Plugin.pm
* dir based plugins now call the file_reassign_volume method in
Plugin.pm as the generic file/directory based method
* restored old `volume_has_feature` method in Plugin.pm and override it
in directory based plugins to check against the new `reassign` feature
(not too happy about the repetition for each plugin)
* task description mapping has been moved from widget-toolkit to
pve-manager/utils
v2 -> v3:
* change locking approach
* add more checks
* add intermedia storage plugin for directory based plugins
* use feature flags
* split up the reassign method to have a dedicated method for the
renaming itself
* handle linked clones
* clean up if disk used to be replicated
I hope I didn't forget anything major.
v1 -> v2:
print info about the new disk volid and key at the end of the job so it
shows up in the CLI output and task log
Changes from RFC -> V1:
* support to reassign unused disks
* digest for target vm config
* reorder the checks a bit
* adding another one to check if the given key for the disk even exists
in the config.
[0] https://lists.proxmox.com/pipermail/pve-devel/2020-November/045986.html
[1] https://lists.proxmox.com/pipermail/pve-devel/2020-November/046031.html
[2] https://lists.proxmox.com/pipermail/pve-devel/2020-November/046030.html
storage: Aaron Lauterer (1):
add disk reassign feature
PVE/Storage.pm | 15 +++++++--
PVE/Storage/CIFSPlugin.pm | 13 ++++++++
PVE/Storage/DirPlugin.pm | 13 ++++++++
PVE/Storage/GlusterfsPlugin.pm | 13 ++++++++
PVE/Storage/LVMPlugin.pm | 24 ++++++++++++++
PVE/Storage/LvmThinPlugin.pm | 1 +
PVE/Storage/NFSPlugin.pm | 13 ++++++++
PVE/Storage/Plugin.pm | 60 ++++++++++++++++++++++++++++++++++
PVE/Storage/RBDPlugin.pm | 31 ++++++++++++++++++
PVE/Storage/ZFSPoolPlugin.pm | 26 +++++++++++++++
10 files changed, 207 insertions(+), 2 deletions(-)
qemu-server: Aaron Lauterer (2):
disk reassign: add API endpoint
cli: disk reassign: add reassign_disk to qm command
PVE/API2/Qemu.pm | 172 ++++++++++++++++++++++++++++++++++++++++
PVE/CLI/qm.pm | 2 +
PVE/QemuServer/Drive.pm | 4 +
3 files changed, 178 insertions(+)
guest-common: Aaron Lauterer (1):
Replication: mention disk reassign in comment of possible reasons
PVE/Replication.pm | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
manager: Aaron Lauterer (1):
ui: tasks: add qmreassign task description
www/manager6/Utils.js | 1 +
1 file changed, 1 insertion(+)
--
2.20.1