Red Hat ENTERPRISE LINUX 5 - VIRTUALIZATION GUIDE Guide d'installation télécharger pdf (Page 338)

The /etc/xen directory contains the configuration files that you use to manage system

resources. The xend daemon configuration file is /etc/xen/xend-config.sxp. This file can

be edited to implement system-wide changes and configure the networking. However, manually

editing files in the /etc/xen/ folder is not advised.

The proc folders 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/

35.5. T roubleshoot ing wit h t he logs

When encountering installation issues with Xen, check the host system's two logs to assist with

troubleshooting. The xend.log file contains the same basic information as when you run the xm

log command. This log is found in the /var/log/ directory. Here is an example log entry for when

you create a domain running a kernel:

[2006-12-27 02:23:02 xend] ERROR (SrvBase: 163) op=create: Error creating domain: (0,

'Error')

Traceback (most recent call list)

File "/usr/lib/python2.4/site-packages/xen/xend/server/SrvBase.py" line 107

in_perform val = op_method (op,req)

File

"/usr/lib/python2.4/site-packages/xen/xend/server/SrvDomainDir.py line 71 in

op_create

raise XendError ("Error creating domain: " + str(ex))

XendError: Error creating domain: (0, 'Error')

The other log file, xend-debug.log, is very useful to system administrators since it contains even

more detailed information than xend.log . Here is the same error data for the same kernel domain

creation problem:

ERROR: Will only load images built for Xen v3.0

ERROR: Actually saw: GUEST_OS=netbsd, GUEST_VER=2.0, XEN_VER=2.0; LOADER=generic,

BSD_SYMTAB'

ERROR: Error constructing guest OS

When calling customer support, always include a copy of both these log files when contacting the

technical support staff.

35.6. T roubleshoot ing wit h t he serial console

The serial console is helpful in troubleshooting difficult problems. If the Virtualization kernel crashes

and the hypervisor generates an error, there is no way to track the error on a local host. However, the

serial console allows you to capture it on a remote host. You must configure the host to output data

to the serial console. Then you must configure the remote host to capture the data. To do this, you

must modify these options in the grub.conf file to enable a 38400-bps serial console on com1

/dev/ttyS0:

title Red Hat Enterprise Linux (2.6.18-8.2080_xen0)

root (hd0,2)

kernel /xen.gz-2.6.18-8.el5 com1=38400,8n1

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