Specifications

• xen-hotplug-log is the logfile that contains data from hotplug events. If a device or a
network script does not come online, the event appears here.
• qemu-dm.[PID].log is the logfile created by the qemu-dm process for each fully virtualized
guest. When using this logfile, you must retrieve the given qemu-dm process PID, by using
the ps command to examine process arguments to isolate the qemu-dm process on the virtual
machine. Note that you must replace the [PID] symbol with the actual PID qemu-dm process.
If you encounter any errors with the Virtual Machine Manager, you can review the generated
data in the virt-manager.log file that resides in the /.virt-manager directory. Note that
every time you start the Virtual Machine Manager, it overwrites the existing logfile contents.
Make sure to backup the virt-manager.log file, before you restart the Virtual Machine
manager after a system error.
3. Important Directory Locations
There are additional utilities and logfiles you should remember when you track errors and
troubleshoot problems within Red Hat Virtualization environments:
• Virtual machines images reside in the /var/lib/xen/images directory.
• When you restart the xend daemon, it updates the xend-database that resides in the
/var/lib/xen/xend-db directory.
• Virtual machine dumps (that you perform with xm dump-core command) resides in the
/var/lib/xen/dumps directory.
• The /etc/xen directory contains the configuration files that you use to manage system
resources. The xend daemon configuration file is called xend-config.sxp and you can use
this file to implement system-wide changes and configure the networking callouts.
• The proc commands are another resource that allows you to gather system information.
These proc entries reside in the /proc/xen directory:
/proc/xen/capabilities
/proc/xen/balloon
/proc/xen/xenbus/
4. Troubleshooting Tools
Chapter 18. Red Hat Virtualization Troubleshooting
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