Red Hat SummitChapter 37. 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.
37.1. Red Hat Enterprise Linux 5 Virtualization log file and directories
링크 복사링크가 클립보드에 복사되었습니다!
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
xenddaemon 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-dmprocess which is started for each fully virtualized guest. - The
PIDis replaced with thePIDof the process of the related qemu-dm process - You can retrieve the
PIDfor a givenqemu-dmprocess using thepscommand and in looking at the process arguments you can identify the virtual machine theqemu-dmprocess 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.
Note
The logfile is overwritten every time you start virt-manager. If you are troubleshooting a problem with virt-manager make sure you save the logfile before you restart virt-manager after an error has occurred.
Red Hat Enterprise Linux 5 Virtualization related directories
There are a few other directories and files which may be of interest when troubleshooting a Red Hat Enterprise Linux 5 Virtualization environment:
/var/lib/libvirt/images/- the standard directory for file-based guest images.
/var/lib/xen/xend-db/- directory that hold the xend database which is generated every time the daemon is restarted.
/etc/xen/- Stores a number of configuration files for the Xen hypervisor.
/etc/xen/xend-config.sxpis the main configuration for the xend daemon. Thexend-config.sxpfile enables or disables migration and other features not configured bylibvirt. Use thelibvirttools for all other features.
/var/lib/xen/dump/- Holds dumps generate by virtual machines or when using the
xm dump-corecommand. /proc/xen/- Stores
xen-kernelinformation in the following files:/proc/xen/capabilities/proc/xen/privcmd/proc/xen/balloon/proc/xen/xenbus/proc/xen/xsd_port/proc/xen/xsd_kva
'%20d='M201.5%20305.5c-13.8%200-24.9-11.1-24.9-24.6%200-13.8%2011.1-24.9%2024.9-24.9%2013.6%200%2024.6%2011.1%2024.6%2024.9%200%2013.6-11.1%2024.6-24.6%2024.6zM504%20256c0%20137-111%20248-248%20248S8%20393%208%20256%20119%208%20256%208s248%20111%20248%20248zm-132.3-41.2c-9.4%200-17.7%203.9-23.8%2010-22.4-15.5-52.6-25.5-86.1-26.6l17.4-78.3%2055.4%2012.5c0%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.3%2024.9-24.9s-11.1-24.9-24.9-24.9c-9.7%200-18%205.8-22.1%2013.8l-61.2-13.6c-3-.8-6.1%201.4-6.9%204.4l-19.1%2086.4c-33.2%201.4-63.1%2011.3-85.5%2026.8-6.1-6.4-14.7-10.2-24.1-10.2-34.9%200-46.3%2046.9-14.4%2062.8-1.1%205-1.7%2010.2-1.7%2015.5%200%2052.6%2059.2%2095.2%20132%2095.2%2073.1%200%20132.3-42.6%20132.3-95.2%200-5.3-.6-10.8-1.9-15.8%2031.3-16%2019.8-62.5-14.9-62.5zM302.8%20331c-18.2%2018.2-76.1%2017.9-93.6%200-2.2-2.2-6.1-2.2-8.3%200-2.5%202.5-2.5%206.4%200%208.6%2022.8%2022.8%2087.3%2022.8%20110.2%200%202.5-2.2%202.5-6.1%200-8.6-2.2-2.2-6.1-2.2-8.3%200zm7.7-75c-13.6%200-24.6%2011.1-24.6%2024.9%200%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.1%2024.9-24.6%200-13.8-11-24.9-24.9-24.9z'/%3e%3c/svg%3e){kind=small}