The Proxmox VM migrator: migrates VMs between different Proxmox VE clusters.
Migrating a virtual machine (VM) on a PVE-cluster from one node to another is implemented in the Proxmox Virtual Environment (PVE). But migrating a VM from one PVE-cluster to another is not.
proxmove helps you move VMs between PVE-clusters with minimal hassle. And if you use ZFS, with minimal downtime too.
Example invocation:
$ proxmove SOURCE_CLUSTER DEST_CLUSTER DEST_NODE DEST_STORAGE VM_NAME1...But, to get it to work, you'll need to configure ~/.proxmoverc
first. See Configuration.
Additional tips:
- If source and destination filesystems use ZFS, the move is done in two
stages, by copying an initial snapshot while the source VM is still
up. Combine with
--wait-before-stopfor additional control. - Use
--debug; it doesn't flood your screen, but provides useful clues about what it's doing. - If your network bridge is different on the
DEST_CLUSTER, use--skip-start; that way proxmove "completes" successfully when done with the move. (You'll still need to change the bridge before starting the VM obviously.) - If proxmove detects that a move was in progress, it will interactively attempt a resume. For ZFS to ZFS syncs, it will do another initial resync before shutting down the source VM.
Full invocation specification (--help):
usage: proxmove [-c FILENAME] [-n] [--bwlimit MBPS] [--no-verify-ssl]
[--skip-disks] [--skip-start] [--wait-before-stop]
[--ssh-ciphers CIPHERS] [--debug] [--ignore-exists]
[-h] [--version]
source destination nodeid storage vm [vm ...]
Migrate VMs from one Proxmox cluster to another.
positional arguments:
source alias of source cluster
destination alias of destination cluster
nodeid node on destination cluster
storage storage on destination node
vm one or more VMs (guests) to move
optional arguments:
-c FILENAME, --config FILENAME
use alternate configuration inifile
-n, --dry-run stop before doing any writes
--bwlimit MBPS limit bandwidth in Mbit/s
--no-verify-ssl skip ssl verification on the api hosts
--skip-disks do the move, but skip copying of the disks;
implies --skip-start
--skip-start do the move, but do not start the new instance
--wait-before-stop prepare the move, but ask for user
confirmation before shutting down the old
instance (useful if you have to move
networks/IPs)
--ssh-ciphers CIPHERS
comma separated list of ssh -c ciphers to
prefer, ([email protected] is supposed to
be fast if you have aes on your cpu); set to
"-" to use ssh defaults
debug arguments:
--debug enables extra debug logging
--ignore-exists continue when target VM already exists; allows
moving to same cluster
other actions:
-h, --help show this help message and exit
--version show program's version number and exit
Cluster aliases and storage locations should be defined in
~/.proxmoverc (or see -c option). See the example proxmoverc.sample.
It requires [pve:CLUSTER_ALIAS] sections for the proxmox "api" URL and
[storage:CLUSTER_ALIAS:STORAGE_NAME] sections with "ssh", "path" and
"temp" settings.
Example run
First you need to configure ~/.proxmoverc; see below.
When configured, you can do something like this:
$ proxmove apple-cluster banana-cluster node2 node2-ssd the-vm-to-move
12:12:27: Attempt moving apple-cluster<e1400248> => banana-cluster<6669ad2c> (node 'node2'): the-vm-to-move
12:12:27: - source VM the-vm-to-move@node1<qemu/565/running>
12:12:27: - storage 'ide2': None,media=cdrom (host=<unknown>, guest=<unknown>)
12:12:27: - storage 'virtio0': sharedsan:565/vm-565-disk-1.qcow2,format=qcow2,iops_rd=4000,iops_wr=500,size=50G (host=37.7GiB, guest=50.0GiB)
12:12:27: Creating new VM 'the-vm-to-move' on 'banana-cluster', node 'node2'
12:12:27: - created new VM 'the-vm-to-move--CREATING' as UPID:node2:00005977:1F4D78F4:57C55C0B:qmcreate:126:user@pve:; waiting for it to show up
12:12:34: - created new VM 'the-vm-to-move--CREATING': the-vm-to-move--CREATING@node2<qemu/126/stopped>
12:12:34: Stopping VM the-vm-to-move@node1<qemu/565/running>
12:12:42: - stopped VM the-vm-to-move@node1<qemu/565/stopped>
12:12:42: Ejected (cdrom?) volume 'ide2' (none) added to the-vm-to-move--CREATING@node2<qemu/126/stopped>
12:12:42: Begin copy of 'virtio0' (sharedsan:565/vm-565-disk-1.qcow2,format=qcow2,iops_rd=4000,iops_wr=500,size=50G) to local-ssd
12:12:42: scp(1) copy from '/pool0/san/images/565/vm-565-disk-1.qcow2' (on sharedsan) to '[email protected]:/node2-ssd/temp/temp-proxmove/vm-126-virtio0'
Warning: Permanently added 'node2.banana-cluster.com' (ECDSA) to the list of known hosts.
vm-565-disk-1.qcow2 100% 50GB 90.5MB/s 09:26
Connection to san.apple-cluster.com closed.
12:22:08: Temp data '/node2-ssd/temp/temp-proxmove/vm-126-virtio0' on local-ssd
12:22:08: Writing data from temp '/node2-ssd/temp/temp-proxmove/vm-126-virtio0' to '/dev/zvol/node2-ssd/vm-126-virtio0' (on local-ssd)
(100.00/100%)
Connection to node2.banana-cluster.com closed.
12:24:25: Removing temp '/node2-ssd/temp/temp-proxmove/vm-126-virtio0' (on local-ssd)
12:24:26: Starting VM the-vm-to-move@node2<qemu/126/stopped>
12:24:27: - started VM the-vm-to-move@node2<qemu/126/running>
12:24:27: Completed moving apple-cluster<e1400248> => banana-cluster<6669ad2c> (node 'node2'): the-vm-to-moveBefore, the-vm-to-move was running on apple-cluster on node1.
Afterwards, the-vm-to-move is running on banana-cluster on node2.
The the-vm-to-move on the apple-cluster has been stopped and renamed to
the-vm-to-move--MIGRATED.
Configuration
Set up the ~/.proxmoverc config file. First you need to define which
clusters you have. For example apple-cluster and banana-cluster.
; Example cluster named "apple-cluster" with 3 storage devices, one
; shared, and two which exist on a single node only.
;
; The user requires various permissions found in the PVEVMAdmin role (VM
; allocate + audit) and PVEAuditor role (Datastore audit) and PVEPoolAdmin
; (to inspect and create pools).
;
[pve:apple-cluster]
api=https://user@pve:[email protected]:443
; Example cluster named "banana-cluster" with 2 storage devices; both
; storage devices exist on the respective nodes only.
[pve:banana-cluster]
api=https://user@pve:[email protected]:443Next, it needs configuration for the storage devices. They are expected to be reachable over SSH; both from the caller and from each other (using SSH-agent forwarding).
The following defines two storage devices for the apple-cluster, one shared and one local to node1 only.
If on sharedsan, the images are probably called something like
/pool0/san/images/VMID/vm-VMID-disk1.qcow2, while in Proxmox, they are
referred to as sharedsan:VMID/vm-VMID-disk1.qcow2.
[storage:apple-cluster:sharedsan] ; "sharedsan" is available on all nodes
ssh[email protected]
path=/pool0/san/images
temp=/pool0/san/private
[storage:apple-cluster:local@node1] ; local disk on node1 only
ssh[email protected]
path=/srv/images
temp=/srv/tempIf you use ZFS storage on banana-cluster, the storage config could look
like this. Disk volumes exist on the ZFS filesystem node1-ssd/images
and node2-ssd/images on the nodes node1 and node2 respectively.
Note that the temp= path is always a regular path.
[storage:banana-cluster:node1-ssd@node1]
ssh[email protected]
path=zfs:node1-ssd/images
temp=/node1-ssd/temp
[storage:banana-cluster:node2-ssd@node2]
ssh[email protected]
path=zfs:node2-ssd/images
temp=/node2-ssd/tempThe config file looks better with indentation. The author suggests this layout:
[pve:apple-cluster]
...
[storage:apple-cluster:sharedsan]
...
[storage:apple-cluster:local@node1]
...
[pve:banana-cluster]
...
[storage:banana-cluster:node1-ssd@node1]
...Debugging
If you run into a ResourceException, you may want to patch proxmoxer 1.0.3
to show the HTTP error reason as well.
--- proxmoxer/core.py 2019-04-04 09:13:16.832961589 +0200
+++ proxmoxer/core.py 2019-04-04 09:15:45.434175030 +0200
@@ -75,8 +75,10 @@ class ProxmoxResource(ProxmoxResourceBas
logger.debug('Status code: %s, output: %s', resp.status_code, resp.content)
if resp.status_code >= 400:
- raise ResourceException("{0} {1}: {2}".format(resp.status_code, httplib.responses[resp.status_code],
- resp.content))
+ raise ResourceException('{0} {1} ("{2}"): {3}'.format(
+ resp.status_code, httplib.responses[resp.status_code],
+ resp.reason, # reason = textual status_code
+ resp.content))
elif 200 <= resp.status_code <= 299:
return self._store["serializer"].loads(resp)It might reveal a bug (or new feature), like:
proxmoxer.core.ResourceException:
500 Internal Server Error ("only root can set 'vmgenid' config"):
b'{"data":null}'
License
proxmove is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 3 or any later version.