Citrix Hypervisor 8.0.0, VmBackup

[JW-wcad]

Hello,
I use VmBackup.py last version to backup my VM:
Here some infos about my config:
Virtualization: xen
Operating System: Citrix Hypervisor 8.0.0
Kernel: Linux 4.19.0+1
Architecture: x86-64
And the Error:
2019-07-04-(16:33:50) - VmBackup.py running with these settings:
2019-07-04-(16:33:50) - backup_dir = /mnt/backup/vmbackup/WIN7
2019-07-04-(16:33:50) - status_log = /mnt/backup/vmbackup/logs/status.log
2019-07-04-(16:33:50) - compress = False
2019-07-04-(16:33:50) - max_backups = 2
2019-07-04-(16:33:50) - vdi_export_format = vhd
2019-07-04-(16:33:50) - pool_db_backup = 0
2019-07-04-(16:33:50) - exclude (cnt)= 0
2019-07-04-(16:33:50) - exclude:
2019-07-04-(16:33:50) - vdi-export (cnt)= 0
2019-07-04-(16:33:50) - vdi-export:
2019-07-04-(16:33:50) - vm-export (cnt)= 1
2019-07-04-(16:33:50) - vm-export: WIN7
Traceback (most recent call last):
File "./VmBackup.py", line 1457, in
session.xenapi.login_with_password(username, password)
File "/mnt/backup/vmbackup/XenAPI.py", line 264, in call
return self.__send(self.__name, args)
File "/mnt/backup/vmbackup/XenAPI.py", line 151, in xenapi_request
self._login(methodname, params)
File "/mnt/backup/vmbackup/XenAPI.py", line 188, in _login
raise e
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:579)
[root@xcp vmbackup]#
The same command on XCP-NG 7.6 works fine!
Regards
Jan

[sniperkitten]

Hi, seems like duplicate of #59

[NAUbackup]

Yes, please see #59 for a workaround.

[NAUbackup]

I have finally been able to attach an external storage device to my CH 8.0 tests pool and will hopefully start investigating this and other issues that occur under CH 8.0 soon. Sorry for the delay, as it's been very busy with many other things as of late.

[NAUbackup]

There are some fundamental differences between the earlier XenAPI.py and CH 8.0 release. Here are the differences (the CH 8.0 is < while the earlier version from XS 7.X is flagged as >):

58,59c58,59
< import six.moves.xmlrpc_client as xmlrpclib
< import six.moves.http_client as httplib
---
> import xmlrpclib
> import httplib
75,78c75,78
<         except Exception as exn:
<             msg = "Xen-API failure: %s" % exn
<             sys.stderr.write(msg)
<             return msg
---
>         except Exception, exn:
>             import sys
>             print >>sys.stderr, exn
>             return "Xen-API failure: %s" % str(self.details)
95c95
< class UDSHTTP(httplib.HTTPConnection):
---
> class UDSHTTP(httplib.HTTP):
102d101
<         self._connection = (None, None)
107c106
<         if sys.version_info[0] <= 2 and sys.version_info[1] < 7:
---
>         if sys.version_info[0] <= 2 and sys.version_info[1] < 6:
123c122
<     session.login_with_password('me', 'mypassword', '1.0', 'xen-api-scripts-xenapi.py')
---
>     session.login_with_password('me', 'mypassword')
129,141c128,130
<                  allow_none=1, ignore_ssl=False):
<
<         # Fix for CA-172901 (+ Python 2.4 compatibility)
<         # Fix for context=ctx ( < Python 2.7.9 compatibility)
<         if not (sys.version_info[0] <= 2 and sys.version_info[1] <= 7 and sys.version_info[2] <= 9 ) \
<                 and ignore_ssl:
<             import ssl
<             ctx = ssl._create_unverified_context()
<             xmlrpclib.ServerProxy.__init__(self, uri, transport, encoding,
<                                            verbose, allow_none, context=ctx)
<         else:
<             xmlrpclib.ServerProxy.__init__(self, uri, transport, encoding,
<                                            verbose, allow_none)
---
>                  allow_none=1):
>         xmlrpclib.ServerProxy.__init__(self, uri, transport, encoding,
>                                        verbose, allow_none)
172a162
>
174,188c164,171
<         try:
<             result = _parse_result(
<                 getattr(self, 'session.%s' % method)(*params))
<             if result is _RECONNECT_AND_RETRY:
<                 raise xmlrpclib.Fault(
<                     500, 'Received SESSION_INVALID when logging in')
<             self._session = result
<             self.last_login_method = method
<             self.last_login_params = params
<             self.API_version = self._get_api_version()
<         except socket.error as e:
<             if e.errno == socket.errno.ETIMEDOUT:
<                 raise xmlrpclib.Fault(504, 'The connection timed out')
<             else:
<                 raise e
---
>         result = _parse_result(getattr(self, 'session.%s' % method)(*params))
>         if result is _RECONNECT_AND_RETRY:
>             raise xmlrpclib.Fault(
>                 500, 'Received SESSION_INVALID when logging in')
>         self._session = result
>         self.last_login_method = method
>         self.last_login_params = params
>         self.API_version = self._get_api_version()
216,217d198
<         elif name == 'logout':
<             return _Dispatcher(self.API_version, self.xenapi_request, "logout")
222c203
<     return Session("http://_var_lib_xcp_xapi/", transport=UDSTransport())
---
>     return Session("http://_var_xapi_xapi/", transport=UDSTransport())

[NAUbackup]

Note the line:
def init(self, uri, transport=None, encoding=None, verbose=0,
allow_none=1, ignore_ssl=False):

which is probably why the https://localhost connection now fails without a valid certificate in place.

Looks like the https://localhost will have to be set to http://localhost by default as all sorts of errors get thrown otherwise.

[NAUbackup]

There are a number of changes in the latest API python library and I feel the easiest is to change the code to state http://localhost and be done with it. It's also then backwards-compatible. I will make a change a push out a minor release update soon.

[NAUbackup]

I have just released V3.25 which should address the http://localhost access issues and should work in all versions of XenServer/Citrix Hypervisor from 6.X through and including 8.0.

[sniperkitten]

Tested new version V3.25, it works fine for me in Xen 8.0

[JW-wcad]

I have just tested the new version (V3.25), it works fine.
Thank You for your very nice work.
Regards
Jan

[txsastre]

hi there.
I've installed an XCP-ng 8.0 it tends to be 99% the same as the citrix hypervisor 8.0
I still have the same SSL error

Traceback (most recent call last):
  File "./VmBackup.py", line 1628, in <module>
    session.xenapi.login_with_password(username, password)
  File "/usr/lib/python2.7/site-packages/XenAPI.py", line 264, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/site-packages/XenAPI.py", line 151, in xenapi_request
    self._login(methodname, params)
  File "/usr/lib/python2.7/site-packages/XenAPI.py", line 188, in _login
    raise e
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:579)

[NAUbackup]

@txsastre, this is with V3.25?

[txsastre]

Yes. Just downloaded today.
also checked the https / http roundabout

[txsastre]

hi, tried on a new server from scratch, same error
the servers are a XCP-NG 8.0

#!/usr/bin/python
#
#NAUVmBackup/VmBackup.py
# V3.25 August 2019

./VmBackup.py password plt-Debian9 preview

[08:52 h2 NAUbackup]# ./VmBackup.py  12341234  plt-Debian9 preview
2019-09-05-(08:52:48) - VmBackup config loaded from: plt-Debian9
2019-09-05-(08:52:48) - VmBackup.py running with these settings:
2019-09-05-(08:52:48) -   backup_dir        = /mnt/backup
2019-09-05-(08:52:48) -   status_log        = /mnt/backup/status.log
2019-09-05-(08:52:48) -   compress          = False
2019-09-05-(08:52:48) -   max_backups       = 2
2019-09-05-(08:52:48) -   vdi_export_format = raw
2019-09-05-(08:52:48) -   pool_db_backup    = 0
2019-09-05-(08:52:48) -   exclude (cnt)= 0
2019-09-05-(08:52:48) -   exclude: 
2019-09-05-(08:52:48) -   vdi-export (cnt)= 0
2019-09-05-(08:52:48) -   vdi-export: 
2019-09-05-(08:52:48) -   vm-export (cnt)= 1
2019-09-05-(08:52:48) -   vm-export: plt-Debian9
['HOST_IS_SLAVE', '192.168.222.73']
Traceback (most recent call last):
  File "./VmBackup.py", line 1628, in <module>
    session.xenapi.login_with_password(username, password)
  File "/usr/lib/python2.7/site-packages/XenAPI.py", line 264, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/site-packages/XenAPI.py", line 151, in xenapi_request
    self._login(methodname, params)
  File "/usr/lib/python2.7/site-packages/XenAPI.py", line 188, in _login
    raise e
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:579)

[txsastre]

hi again. I make it work

NAUVmBackup v3.25
in line
1628
replace
session = XenAPI.Session('https://' + e.details[1])
with
session = XenAPI.Session('http://' + e.details[1])

(remove the "s" in "httpS")

[NAUbackup]

Awesome, @txsastre thank you! I will fix and redistribute the code. Many thanks -- missed that one somehow.

[txsastre]

Glad to help :) . Thank to you for this priceless tool!

[NAUbackup]

Our pleasure!

[NAUbackup]

Code is updated in the repository.