I have a oVirt setup that has three nodes, all running CentOS 7, with a
hosted engine running CentOS 6.  Two of the nodes (node8 and node9) are
configured for hosted engine, and the third (node2) is just a "regular"
node (as you might guess from the names, more nodes are coming as I
migrate VMs to oVirt).

On one node, node8, vdsm periodically loses its connection to libvirt,
which causes vdsm to restart.  There doesn't appear to be any trigger
that I can see (not time of day, load, etc. related).  The engine VM is
up and running on node8 (don't know if that has anything to do with it).

I get some entries in /var/log/messages repeated continuously; the
"ovirt-ha-broker: sending ioctl 5401 to a partition" I mentioned before,
and the following:

Dec 15 20:56:23 node8 journal: User record for user '107' was not found: No 
such file or directory
Dec 15 20:56:23 node8 journal: Group record for user '107' was not found: No 
such file or directory

I don't think those have any relevance (don't know where they come
from); filtering those out, I see:

Dec 15 20:56:33 node8 journal: End of file while reading data: Input/output 
Dec 15 20:56:33 node8 journal: Tried to close invalid fd 0
Dec 15 20:56:38 node8 journal: vdsm root WARNING connection to libvirt broken. 
ecode: 1 edom: 7
Dec 15 20:56:38 node8 journal: vdsm root CRITICAL taking calling process down.
Dec 15 20:56:38 node8 journal: vdsm vds ERROR libvirt error
Dec 15 20:56:38 node8 journal: ovirt-ha-broker mgmt_bridge.MgmtBridge ERROR 
Failed to getVdsCapabilities: Error 16 from getVdsCapabilities: Unexpected 
Dec 15 20:56:45 node8 journal: End of file while reading data: Input/output 
Dec 15 20:56:45 node8 vdsmd_init_common.sh: vdsm: Running run_final_hooks
Dec 15 20:56:45 node8 systemd: Starting Virtual Desktop Server Manager...
<and then all the normal-looking vdsm startup>

It is happening about once a day, but not at any regular interval or
time (was 02:23 Sunday, then 20:56 Monday).

vdsm.log has this at that time:

20:56:38,715::BindingXMLRPC::1132::vds::(wrapper) client []::call 
getCapabilities with () {}
Thread-601576::DEBUG::2014-12-15 20:56:38,718::utils::738::root::(execCmd) 
/sbin/ip route show to table all (cwd None)
Thread-601576::DEBUG::2014-12-15 20:56:38,746::utils::758::root::(execCmd) 
SUCCESS: <err> = ''; <rc> = 0
20:56:38,754::libvirtconnection::135::root::(wrapper) connection to libvirt 
broken. ecode: 1 edom: 7
20:56:38,754::libvirtconnection::137::root::(wrapper) taking calling process 
MainThread::DEBUG::2014-12-15 20:56:38,754::vdsm::58::vds::(sigtermHandler) 
Received signal 15
20:56:38,755::libvirtconnection::143::root::(wrapper) Unknown libvirterror: 
ecode: 1 edom: 7 level: 2 message: internal error: client socket is closed
20:56:38,755::protocoldetector::135::vds.MultiProtocolAcceptor::(stop) Stopping 
20:56:38,755::__init__::563::jsonrpc.JsonRpcServer::(stop) Stopping JsonRPC 
Detector thread::DEBUG::2014-12-15 
Cleaning Acceptor
MainThread::INFO::2014-12-15 20:56:38,757::vmchannels::188::vds::(stop) VM 
channels listener was stopped.
MainThread::INFO::2014-12-15 20:56:38,758::momIF::91::MOM::(stop) Shutting down 
Task=`26c7680c-23e2-42bb-964c-272e778a168a`::moving from state init -> state 
MainThread::INFO::2014-12-15 20:56:38,759::logUtils::44::dispatcher::(wrapper) 
Run and protect: prepareForShutdown(options=None)
20:56:38,755::BindingXMLRPC::1142::vds::(wrapper) libvirt error
Traceback (most recent call last):
  File "/usr/share/vdsm/rpc/BindingXMLRPC.py", line 1135, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/rpc/BindingXMLRPC.py", line 463, in getCapabilities
    ret = api.getCapabilities()
  File "/usr/share/vdsm/API.py", line 1245, in getCapabilities
    c = caps.get()
  File "/usr/share/vdsm/caps.py", line 615, in get
  File "/usr/lib/python2.7/site-packages/vdsm/netinfo.py", line 812, in get
    nets = networks()
  File "/usr/lib/python2.7/site-packages/vdsm/netinfo.py", line 119, in networks
    allNets = ((net, net.name()) for net in conn.listAllNetworks(0))
  File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py", line 129, 
in wrapper
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3642, in 
    if ret == -1: raise libvirtError ('virConnectGetLibVersion() failed', 
libvirtError: internal error: client socket is closed

Chris Adams <c...@cmadams.net>
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