Migration of VM

[ash]

Hi,

I wish to migrate a vm, is it possible to do so using dd command when th vm is off. If i have a vm in node1 as 1001 and i create a dummy vm 1002 in node2 with same configuration as node1, both vms are stopped and then using dd command can i migrate 1001 to 1002?

I have 2 nodes with a cluster both have same pveversion.

pveversion -v
proxmox-ve: 6.1-2 (running kernel: 5.3.18-2-pve)
pve-manager: 6.1-7 (running version: 6.1-7/13e58d5e)
pve-kernel-helper: 6.1-6
pve-kernel-5.3: 6.1-5
pve-kernel-5.3.18-2-pve: 5.3.18-2
ceph-fuse: 12.2.11+dfsg1-2.1+b1
corosync: 3.0.3-pve1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: 0.8.35+pve1
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.15-pve1
libpve-access-control: 6.0-6
libpve-apiclient-perl: 3.0-3
libpve-common-perl: 6.0-13
libpve-guest-common-perl: 3.0-3
libpve-http-server-perl: 3.0-4
libpve-storage-perl: 6.1-5
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 3.2.1-1
lxcfs: 3.0.3-pve60
novnc-pve: 1.1.0-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.1-3
pve-cluster: 6.1-4
pve-container: 3.0-21
pve-docs: 6.1-6
pve-edk2-firmware: 2.20200229-1
pve-firewall: 4.0-10
pve-firmware: 3.0-6
pve-ha-manager: 3.0-8
pve-i18n: 2.0-4
pve-qemu-kvm: 4.1.1-3
pve-xtermjs: 4.3.0-1
qemu-server: 6.1-6
smartmontools: 7.1-pve2
spiceterm: 3.1-1
vncterm: 1.6-1
zfsutils-linux: 0.8.3-pve1

# cat /etc/pve/storage.cfg
dir: local
path /var/lib/vz
content iso,backup,vztmpl

lvmthin: local-lvm
thinpool data
vgname pve
content rootdir,images

dir: vms_file
path /vms
content images,rootdir

lvm: vg1
vgname vg_prox1
content images,rootdir

lvm: v2
vgname vg_prox2
content images,rootdir

here vg1 is the storage in node1 and v2 is the storage of node2

 

[tom]

VM migration inside a cluster can be done with one click => Migrate VM.

 

[ash]

VM migration inside a cluster can be done with one click => Migrate VM.

yes i know it is just a click. but i wanted to try out with dd. IS it possible?

 

[tom]

yes i know it is just a click. but i wanted to try out with dd. IS it possible?

yes, but as our migrate command is doing all perfectly I do not see any reason to use dd ..

 

[ash]

yes, but as our migrate command is doing all perfectly I do not see any reason to use dd ..

I created a VM on node1 and node2, using ls command i am able to view the lvm of my vm. Turned off the VM, using ls command i cannot see the lvm, so when i use dd command dd if=$SOURCE_DISK_PATH | throttle -v -w 2 -m $SPEED | ssh -oStrictHostKeyChecking=no -i /var/virtualizor/ssh-keys/id_rsa -q -p $TO_SSH_PORT root@$TO_IP dd of=$DEST_DISK_PATH i get error stating that the
dd: failed to open the lvm: No such file or directory

Or if i use your migrate option is it possible that i can pass the destination vm where i want to migrate my source vm to?

 

[LnxBil]

I created a VM on node1 and node2, using ls command i am able to view the lvm of my vm. Turned off the VM, using ls command i cannot see the lvm, so when i use dd command dd if=$SOURCE_DISK_PATH | throttle -v -w 2 -m $SPEED | ssh -oStrictHostKeyChecking=no -i /var/virtualizor/ssh-keys/id_rsa -q -p $TO_SSH_PORT root@$TO_IP dd of=$DEST_DISK_PATH i get error stating that the
dd: failed to open the lvm: No such file or directory

Without the actual values behind the variables and setup on the source and destination, we can only guess what's wrong...

 

[ash]

Without the actual values behind the variables and setup on the source and destination, we can only guess what's wrong...

when VM is on:
root@master:~# ls -lha /dev/vg_master/
total 0
drwxr-xr-x 2 root root 80 Sep 21 13:04 .
drwxr-xr-x 20 root root 4.3K Sep 21 13:04 ..
lrwxrwxrwx 1 root root 7 Sep 21 11:10 test -> ../dm-6
lrwxrwxrwx 1 root root 7 Sep 21 13:04 vm-1026-d5oqvtklo2kkzvzj-mf2hq1lvyvvguqrl -> ../dm-7

when VM is off:
root@master:~# ls -lha /dev/vg_master/
total 0
drwxr-xr-x 2 root root 60 Sep 21 13:05 .
drwxr-xr-x 20 root root 4.3K Sep 21 13:05 ..
lrwxrwxrwx 1 root root 7 Sep 21 11:10 test -> ../dm-6

if you see dm-7 is not visible when VM is off and hence when i execute the dd command it fails

dd if=/dev/vg_master/vm-1026-d5oqvtklo2kkzvzj-mf2hq1lvyvvguqrl | throttle -v -w 2 -m 1000 | ssh -oStrictHostKeyChecking=no -i /var/virtualizor/ssh-keys/id_rsa -q -p 22 root@10.1.5.23 dd of=/dev/slave_vg/vm-1027-d0fgfdoq2feotmgv-lwnw1kk5mpj5bsus

dd: failed to open '/dev/vg_master/vm-1026-d5oqvtklo2kkzvzj-mf2hq1lvyvvguqrl': No such file or directory