Red Hat Bugzilla – Bug 869557
Can't add more than 256 logical networks
Last modified: 2013-02-21 02:10:59 EST
Created attachment 632622 [details] vdsm.log Description of problem: libvirt version < 0.9.13 limit the network number to 256, If we add more then 256 networks libvirt return: virsh -r net-list error: Failed to list active networks error: too many remote undefineds: 257 > 256 error: Reconnected to the hypervisor and VDSM fails to report vdsCaps: vdsClient -s 0 getVdsCaps Unexpected exception Version-Release number of selected component (if applicable): vdsm-4.9.6-38.0.el6_3.x86_64 libvirt-0.9.10-21.el6_3.5.x86_64 How reproducible: 100% Steps to Reproduce: 1.Create 260 networks and attache them to the host. Actual results: libvirt limit networks to 256 and VDSM non responsive. Expected results: Should be able to create more then 256 networks on libvirt and VDSM should be responsive even if libvirt fail. Additional info: Thread-3620::ERROR::2012-10-23 17:14:12,590::BindingXMLRPC::883::vds::(wrapper) libvirt error Traceback (most recent call last): File "/usr/share/vdsm/BindingXMLRPC.py", line 879, in wrapper res = f(*args, **kwargs) File "/usr/share/vdsm/BindingXMLRPC.py", line 288, in getCapabilities ret = api.getCapabilities() File "/usr/share/vdsm/API.py", line 1039, in getCapabilities c = caps.get() File "/usr/share/vdsm/caps.py", line 247, in get caps.update(netinfo.get()) File "/usr/lib64/python2.6/site-packages/vdsm/netinfo.py", line 249, in get nets = networks() File "/usr/lib64/python2.6/site-packages/vdsm/netinfo.py", line 72, in networks for name in conn.listNetworks(): File "/usr/lib64/python2.6/site-packages/libvirt.py", line 3240, in listNetworks messages. Failure to do so may result in connections being closed libvirtError: Cannot write data: Broken pipe Thread-3621::ERROR::2012-10-23 17:14:13,093::BindingXMLRPC::883::vds::(wrapper) libvirt error Traceback (most recent call last): File "/usr/share/vdsm/BindingXMLRPC.py", line 879, in wrapper res = f(*args, **kwargs) File "/usr/share/vdsm/BindingXMLRPC.py", line 288, in getCapabilities ret = api.getCapabilities() File "/usr/share/vdsm/API.py", line 1039, in getCapabilities c = caps.get() File "/usr/share/vdsm/caps.py", line 247, in get caps.update(netinfo.get()) File "/usr/lib64/python2.6/site-packages/vdsm/netinfo.py", line 249, in get nets = networks() File "/usr/lib64/python2.6/site-packages/vdsm/netinfo.py", line 72, in networks for name in conn.listNetworks(): File "/usr/lib64/python2.6/site-packages/libvirt.py", line 3240, in listNetworks messages. Failure to do so may result in connections being closed libvirtError: Cannot write data: Broken pipe
The libvirt patch that lifts this arbitrary limit is: eb635de - rpc: Size up RPC limits — Michal Privoznik And it is included in libvirt 0.9.13. Thus, to fix this bug, we shall move the required libvirt version to >=0.9.13.
Fixed by v0.9.12-146-geb635de taken in when we rebased to 0.10.2: commit eb635de1fed3257c5c62b552d1ec981c9545c1d7 Author: Michal Privoznik <mprivozn@redhat.com> Date: Fri Apr 27 14:49:48 2012 +0200 rpc: Size up RPC limits Since we are allocating RPC buffer dynamically, we can increase limits for max. size of RPC message and RPC string. This is needed to cover some corner cases where libvirt is run on such huge machines that their capabilities XML is 4 times bigger than our current limit. This leaves users with inability to even connect.
Verified. I reproduced this bug on RHEL6.3 with libvirt-0.9.10-21.el6_3.5.x86_64, then I've updated libvirt to libvirt-0.10.2-1.el6.x86_64, and I was able to attach much more than 256 vlan networks to host's nic: At the moment: # virsh -r net-list | wc -l 763
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2013-0276.html