Troubleshooting The Xen Para-Virtualized Drivers; Red Hat Enterprise Linux 5 Virtualization Log File And Directories - Red Hat ENTERPRISE LINUX 5 - VIRTUALIZATION GUIDE Manual

Chapter 35.
Troubleshooting the Xen para-
virtualized drivers
This chapter deals with issues you may encounter with Xen hosts and fully virtualized Red Hat
Enterprise Linux guests using the para-virtualized drivers.
35.1. Red Hat Enterprise Linux 5 Virtualization log file and
directories
Red Hat Enterprise Linux 5 Virtualization related log file
In Red Hat Enterprise Linux 5, the log file written by the xend daemon and the qemu-dm process are
all kept in the following directories:
/var/log/xen/
directory holding all log file generated by the xend daemon and qemu-dm process.
xend.log
• This logfile is used by xend to log any events generate by either normal system events or
operator initiated events.
• virtual machine operations such as create, shutdown, destroy etc are all logged in this logfile.
• Usually this logfile will be the first place to look at in the event of a problem. In many cases you
will be able to identify the root cause by scanning the logfile and review the entries logged just
prior to the actual error message.
xend-debug.log
• Records error events from xend and its subsystems (from the framebuffer and Python scripts)
xen-hotplug.log
• Logs events from hotplug events.
• Event notifications from devices not coming online or network bridges not online are logged in
this file.
qemu-dm.PID.log
• This file is created by the qemu-dm process which is started for each fully virtualized guest.
• The PID is replaced with the PID of the process of the related qemu-dm process
• You can retrieve the PID for a given qemu-dm process using the ps command and in looking at
the process arguments you can identify the virtual machine the qemu-dm process belongs to.
If you are troubleshooting a problem with the virt-manager application you can also review the logfile
generated by it. The logfile for virt-manager will be in a directory called .virt-manager in the user's
home directory whom ran virt-manager. This directory will usually be ~/.virt-manager/virt-
manager.
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