Xen to XCP-NG

[josef1909]

Hi,
I might missed it out: Can someone point me out to a good documentation xen to import with xoa or xcp-ng. For example:

• What needs to give attention to when exporting a Xen VM?
• Is there any bestpractice from commandline
  What are the do's and dont's?
  It will be CentOS machines.
  Cheers and thanks!
  Josef

[olivierlambert]

Hi!

Take a look at https://docs.xcp-ng.org/installation/migrate-to-xcp-ng/#-from-xen-on-linux

[josef1909]

Hi @olivierlambert ,
Thanks for that script. I was working on it the last day and had some attempt to day with some python 2to3 converter. I am not lucky
Is there a tested Python3 script ?
Cheers and thanks for your help,
Josef

[olivierlambert]

Sadly, you'll need Python 2. I'll be happy if the community around could make it updated for Python 3

[josef1909]

Hi @olivierlambert ,
I worked on the P3 Script. at this time, I getting to the stage where the script returns
VM Details:
Name: justanothername
Type: Paravirtualised
VCPUS: 4
Memory(bytes): 2147483648
ACPI: true
APIC: true
PAE: true
NX: false
Viridian: true
Disk xvda(Bootable): /dev/vgxen/justanothername
Connecting to target xxx.xxx.145.157

Processing disk /dev/vgxen/justanothername(21474836480 bytes)
Internal Error. Possible problem: Please make sure you have enough space on your default SR

While this is an issue which is announced on the link you send, I check via xoa and xcp-ng center. We have set a default SR. may I ask your help to proceed?

[olivierlambert]

Hmm it's probably not processing correctly the SR size on destination?

[josef1909]

@olivierlambert Can we just stream it like fire and forget as long it can identify the default SR?

[josef1909]

@josef1909 I just need to go ahead to check if the script will send more issues I need to work on.

[josef1909]

Hi @olivierlambert ,
Please check script here or might suggest someone to collaborate:
https://github.com/josef-bocklage/xcp-ng_xen2xcpng-py3/blob/main/xen2xcpng-Vpy3.py

[josef1909]

Hi, I just wanted to check-in if someone was so kind and had a look.
Cheers,
Josef

[olivierlambert]

Hi!

We are pretty busy here (at Vates) about 8.2.1 new ISO and 8.3 release. We'll be happy that anyone around in the community is able to assist!

[josef1909]

@olivierlambert understand.
Please let me know if I can help trigger people to support on that.
It seems that this topic has already a little dust on it - so I am happy to collabortate.

In the meantime, I made some Tests and will provide the last lines from the debugging.

> /root/xen2xcpng3-V1.py(839)<module>()
-> if options.filename:
(Pdb) n
> /root/xen2xcpng3-V1.py(842)<module>()
-> machine.save_as(server=options.server, username=options.username,
(Pdb) n
> /root/xen2xcpng3-V1.py(843)<module>()
-> password=options.password, ssl= not options.nossl,  sparse=options.sparse, sftp=options.sftp)
(Pdb) n
> /root/xen2xcpng3-V1.py(842)<module>()
-> machine.save_as(server=options.server, username=options.username,
(Pdb) n
VM Details:
Name: JUSTANOTHERNAME
Type: Paravirtualised
VCPUS: 4
Memory(bytes): 2147483648
ACPI: true
APIC: true
PAE: true
NX: false
Viridian: true
Disk xvda(Bootable): /dev/vgxen/JUSTANOTHERNAME
Connecting to target XXX.XXX.XXX.157

Processing disk /dev/vgxen/JUSTANOTHERNAME(21474836480 bytes)
TypeError: initial_value must be str or None, not bytes
> /root/xen2xcpng3-V1.py(842)<module>()
-> machine.save_as(server=options.server, username=options.username,
(Pdb) 

[josef1909]

Here are some more logs from todays session:

(Pdb) n
> /root/xen2xcpng3-V1.py(871)<module>()
-> machine.save_as(server=options.server, username=options.username,
(Pdb) w
  /usr/lib/python3.9/bdb.py(580)run()
-> exec(cmd, globals, locals)
  <string>(1)<module>()
> /root/xen2xcpng3-V1.py(871)<module>()
-> machine.save_as(server=options.server, username=options.username,
(Pdb) n
VM Details:
Name: JUSTANOTHERNAME
Type: Paravirtualised
VCPUS: 4
Memory(bytes): 2147483648
ACPI: true
APIC: true
PAE: true
NX: false
Viridian: true
Disk xvda(Bootable): /dev/vgxen/JUSTANOTHERNAME
Connecting to target xxx.xxx.xxx.157

Processing disk /dev/vgxen/JUSTANOTHERNAME(21474836480 bytes)
TypeError: initial_value must be str or None, not bytes
> /root/xen2xcpng3-V1.py(871)<module>()
-> machine.save_as(server=options.server, username=options.username,
(Pdb) w
  /usr/lib/python3.9/bdb.py(580)run()
-> exec(cmd, globals, locals)
  <string>(1)<module>()
> /root/xen2xcpng3-V1.py(871)<module>()
-> machine.save_as(server=options.server, username=options.username,
  /root/xen2xcpng3-V1.py(617)save_as()
-> string = io.StringIO(input_buffer)
(Pdb) n
--Return--
> /root/xen2xcpng3-V1.py(871)<module>()->None
-> machine.save_as(server=options.server, username=options.username,
(Pdb) w
  /usr/lib/python3.9/bdb.py(580)run()
-> exec(cmd, globals, locals)
  <string>(1)<module>()->None
> /root/xen2xcpng3-V1.py(871)<module>()->None
-> machine.save_as(server=options.server, username=options.username,
(Pdb) n
TypeError: initial_value must be str or None, not bytes
> <string>(1)<module>()->None
(Pdb) w
  /usr/lib/python3.9/bdb.py(580)run()
-> exec(cmd, globals, locals)
> <string>(1)<module>()->None
  /root/xen2xcpng3-V1.py(871)<module>()->None
-> machine.save_as(server=options.server, username=options.username,
  /root/xen2xcpng3-V1.py(617)save_as()
-> string = io.StringIO(input_buffer)
(Pdb) n
--Return--
> <string>(1)<module>()->None
(Pdb) w
  /usr/lib/python3.9/bdb.py(580)run()
-> exec(cmd, globals, locals)
> <string>(1)<module>()->None
(Pdb) n
Traceback (most recent call last):
  File "/usr/lib/python3.9/pdb.py", line 1723, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib/python3.9/pdb.py", line 1583, in _runscript
    self.run(statement)
  File "/usr/lib/python3.9/bdb.py", line 580, in run
    exec(cmd, globals, locals)
  File "<string>", line 1, in <module>
  File "/root/xen2xcpng3-V1.py", line 871, in <module>
    machine.save_as(server=options.server, username=options.username,
  File "/root/xen2xcpng3-V1.py", line 617, in save_as
    string = io.StringIO(input_buffer)
TypeError: initial_value must be str or None, not bytes
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> /root/xen2xcpng3-V1.py(617)save_as()
-> string = io.StringIO(input_buffer)
(Pdb) q
Post mortem debugger finished. The /root/xen2xcpng3-V1.py will be restarted
> /root/xen2xcpng3-V1.py(13)<module>()

[olivierlambert]

I know @yann is very busy but if he can, he'll take a look

[josef1909]

@olivierlambert @yann
I understand that there is a big GoLive on your side.
Do we have alternative suggestions to migrate from xen to xcp-ng?

[olivierlambert]

The other alternative, if a bit cumbersome, is to use Clonezilla, like a P2V situation

[andrewperry]

I also worked on trying to update the script to python3 last week and hadn't realised you had this work here so was starting from scratch.

I am not a python developer so when I got to errors in the section that is actually streaming the files I decided to stop and just finish 'making' python2.7 on the servers that I need to get the VMs off and that has worked for me.

It doesn't seem like it should be a huge amount of work left to upgrade the script to python3 but probably not something I have the skills or time for right now.

Thanks for sharing your efforts here. What have you ended up doing @josef1909

[olivierlambert]

Thanks for re-pinging. This might be a "simple" mission to finance to a Python specialist. Let me add @AtaxyaNetwork in the loop.