add some notes about OpenVz/quagga flakiness

wiki/Troubleshooting.wiki

@@ -6,6 +6,7 @@
    * `/var/log/coreexecd.log` - CORE execution daemon log file may indicate failed jobs, those commands exiting with a non-zero status
 
 == Linux OpenVZ version ==
+
  * *debugging commands:*
    * `vzlist` - lists all running containers
    * `brctl show` - lists all bridge devices, see if container veth devices have joined the correct bridges
@@ -22,6 +23,17 @@ Failed to open API channel to 127.0.0.1:4038: couldn't open socket: connection r
 }}}
  * *Resolution:*  This suggests that cored was not running or is hung.  Try "sudo killall cored", and if no process was killed, check also that there is not a /var/run/cored.pid file lying around.  Try restarting cored in verbose mode: "sudo /usr/local/sbin cored -v" and if that works, restart it in daemon mode such as: "sudo /usr/local/sbin/cored -d".  Check the log file in /var/log/cored.log if all else fails. 
 
+  * *Issue:*  when starting multiple quagga routers, only some come up into operational state.
+  * *Resolution:*  This is flakiness with the OpenVz version of CORE.  I have noticed that sometimes the containers start without interface lo in an "UP" state, and that zebra sometimes does not start successfully.  If you find a node in this state, here are some suggested resolution steps:
+{{{
+killall zebra ospfd ospf6d
+ifconfig lo up
+zebra -d
+ospf -d
+ospf6d -d
+vtysh -b
+}}}
+
 == FreeBSD version == 
  * *debugging commands:*
    * `vimage -l` - lists all running vimages