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The trace below seems to be wanting to access the console log, rather than the VNC console.

I believe there is a blog post about how to enable this, but basically you need a cronjob to run in dom0 to rotate the logs.  This is because the Xen console logging is not ring-based, and therefore without a cronjob it will fill the logging up.  Therefore it is not enabled by default.

To enable the console log, check out https://github.com/openstack/nova/blob/master/tools/xenserver/rotate_xen_guest_logs.sh and add crontab entries for that script as described at the top of the file.

The first invocation of the script will enable the console logs for your VMs and you then won't see the error log.

Thanks,

Bob

________________________________
From: Rajshree Thorat [rajshree.thorat at gslab.com]
Sent: 29 October 2013 09:25
To: openstack Users; OpenStack Development Mailing List
Subject: [openstack-dev] Unable to logging to guest console on XCP/xenserver

Hi,

I am trying to use Openstack Havana to control XCP hypervisor with neutron OVS plugin. I can launch instances normally but unable to logging to guest console. Please see the below log from nova compute to get a clear idea.

Log:

2013-10-29 14:09:10.203 954 AUDIT nova.compute.manager [req-157fb348-69fb-4b7f-b50c-44ef85e85f11 42ffb12172244726a1a15d044167de86 2c4acdf64eed40f7a9efcf3b7dd13259] [instance: cf5678ec-5284-48cc-a8d6-005eac42118e] Get console output
2013-10-29 14:09:10.296 954 ERROR nova.virt.xenapi.vmops [req-157fb348-69fb-4b7f-b50c-44ef85e85f11 42ffb12172244726a1a15d044167de86 2c4acdf64eed40f7a9efcf3b7dd13259] ['XENAPI_PLUGIN_FAILURE', 'get_console_log', 'IOError', "[Errno 2] No such file or directory: '/var/log/xen/guest/console.7'"]
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops Traceback (most recent call last):
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/vmops.py", line 1446, in get_console_output
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops     'get_console_log', {'dom_id': dom_id})
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/driver.py", line 796, in call_plugin
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops     host, plugin, fn, args)
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/driver.py", line 851, in _unwrap_plugin_exceptions
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops     return func(*args, **kwargs)
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops   File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 229, in __call__
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops     return self.__send(self.__name, args)
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops   File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 133, in xenapi_request
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops     result = _parse_result(getattr(self, methodname)(*full_params))
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops   File "/usr/local/lib/python2.7/dist-packages/XenAPI.py", line 203, in _parse_result
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops     raise Failure(result['ErrorDescription'])
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops Failure: ['XENAPI_PLUGIN_FAILURE', 'get_console_log', 'IOError', "[Errno 2] No such file or directory: '/var/log/xen/guest/console.7'"]
2013-10-29 14:09:10.296 954 TRACE nova.virt.xenapi.vmops
2013-10-29 14:09:10.358 954 ERROR nova.openstack.common.rpc.amqp [req-157fb348-69fb-4b7f-b50c-44ef85e85f11 42ffb12172244726a1a15d044167de86 2c4acdf64eed40f7a9efcf3b7dd13259] Exception during message handling
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp Traceback (most recent call last):
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/amqp.py", line 461, in _process_data
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     **args)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/rpc/dispatcher.py", line 172, in dispatch
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     result = getattr(proxyobj, method)(ctxt, **kwargs)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 90, in wrapped
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     payload)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 73, in wrapped
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     return f(self, context, *args, **kw)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 271, in decorated_function
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     e, sys.exc_info())
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 258, in decorated_function
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     return function(self, context, *args, **kwargs)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3502, in get_console_output
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     output = self.driver.get_console_output(instance)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/driver.py", line 374, in get_console_output
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     return self._vmops.get_console_output(instance)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp   File "/usr/lib/python2.7/dist-packages/nova/virt/xenapi/vmops.py", line 1450, in get_console_output
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp     raise exception.NovaException(msg)
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp NovaException: Guest does not have a console available
2013-10-29 14:09:10.358 954 TRACE nova.openstack.common.rpc.amqp
2013-10-29 14:09:10.362 954 ERROR nova.openstack.common.rpc.common [req-157fb348-69fb-4b7f-b50c-44ef85e85f11 42ffb12172244726a1a15d044167de86 2c4acdf64eed40f7a9efcf3b7dd13259] Returning exception Guest does not have a console available to caller

Any pointers to debug the issue would be really helpful. Please let me know how I can debug this issue.

Regards,
Rajshree

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