CentOS 安装 KVM 桥接网卡方法

按照步骤装好后，新建客户机总是报错，说“Internal Error：Domain liukai didn't show up”，实在不知道如何解决，折腾了一天后终于知道是SELinux的问题，把SELinux设置permissive就可以了

记录一下：

[e-mail] 2009-03-10 07:47:28 EDT

Description of problem:

Unable to complete install ' internal error
Domain mybooksdb2 didn't show up

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/create.py", line 717, in do_install
    dom = guest.start_install(False, meter = meter)
  File "/usr/lib/python2.6/site-packages/virtinst/Guest.py", line 536, in
start_install
    return self._do_install(consolecb, meter, removeOld, wait)
  File "/usr/lib/python2.6/site-packages/virtinst/Guest.py", line 628, in
_do_install
    self.domain = self.conn.createLinux(install_xml, 0)
  File "/usr/lib64/python2.6/site-packages/libvirt.py", line 973, in
createLinux
    if ret is None:raise libvirtError('virDomainCreateLinux() failed',
conn=self)
libvirtError: internal error Domain mybooksdb2 didn't show up
'

Version-Release number of selected component (if applicable):
libvirt-0.6.1-2.fc11.x86_64

How reproducible:
Install a guest using virt-manager    

Daniel Berrange 2009-03-10 07:51:46 EDT

Can you check if anything is present in /var/log/libvirt/qemu/mybooksdb2.log
and attach to this BZ if found. Also, check is 'ps -auxwf' shows any QEMU
process running ?    

[e-mail] 2009-03-10 08:17:15 EDT

LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin /usr/bin/qemu-system-x86_64 -S -M
pc -no-kqemu -m 4096 -smp 2 -name mybooksdb2 -uuid
ad1a2204-4bf4-146d-c69a-0372db76ccc3 -monitor pty -
pidfile /var/run/libvirt/qemu//mybooksdb2.pid -no-reboot -boot d -drive
file=/dev/sdb2,if=ide,index=0 -drive file=/dev/sr0,if=ide,media=cdrom,index=2
-net nic,macaddr=54:52:00:64:d
9:d2,vlan=0 -net tap,fd=18,script=,vlan=0,ifname=vnet0 -serial pty -parallel
none -usb -usbdevice tablet -vnc 127.0.0.1:0 -k en-us -soundhw es1370 
qemu: at most 2047 MB RAM can be simulated

qemu            0:off 1:off 2:on 3:on 4:on 5:on 6:off

sh-4.0# ps auxwf | grep -i qemu
root      4160  0.0  0.0  87740   804 pts/0    S+   13:16   0:00             
\_ grep -i qemu

I will retry with less memory. since it complained about 2047 being max.    

[e-mail] 2009-03-10 08:18:51 EDT

sh-4.0# service qemu status
qemu binary format handlers are not registered.    

[e-mail] 2009-03-10 08:22:11 EDT

ok works now, sorry for false alarm

started qemu (seems it didnt start on boot unlike chkconfig says)
also used less memory (2047)
put selinux into permissive mode.    

[e-mail] 2009-03-10 08:32:26 EDT

After this it hangs here:

...trying to set up timer (IRQ0) through 8259A ...
..... (found apic 0 pin 2) ...
....... failed.
...trying to set up timer as Virtual Wire IRQ...    

Daniel Berrange 2009-03-10 08:38:38 EDT

RE , you are hitting this QEMU bug:



See the attachment on that bug, showing exactly same log as you have


I'm going to leave this bug open for a while, until I figure out whether we can
get better error reporting for the initial problem you reported (too much RAM)    

Mark McLoughlin 2009-03-25 13:39:50 EDT

Okay, so the goal here is to see if we can replace:

  libvirtError: internal error Domain mybooksdb2 didn't show up

with e.g.

  libvirtError: qemu: at most 2047 MB RAM can be simulated    

Bug Zapper 2009-06-09 08:04:47 EDT

This bug appears to have been reported against 'rawhide' during the Fedora 11
development cycle.
Changing version to '11'.

More information and reason for this action is here:
    

Ricky Burgin 2009-07-03 21:50:32 EDT

I'd like to confirm that when I received this error, I did not have QEMU
installed and running and I had SELinux completely enabled on its default
settings post-FC11 install.

By installing and starting QEMU and changing SELinux to permissive, the error
went away and the virtual machine kicked in. Though, it may have just been one
or the other, not both QEMU and SELinux.

I did not try using over 2047MB of RAM.    

Mark McLoughlin 2009-07-31 06:36:48 EDT

Fixed upstream in 0.6.4 by:

  

which depends on a fairly large previous patch. Since this only makes
diagnosing errors easy, I'm not going to backport to F11 and mark it as fixed
in rawhide.    

桥接网卡的方法

1、创建文件/etc/sysconfig/network-scripts/ifcfg-br0 
ifcfg-br0内容如下： 

DEVICE=br0 
TYPE=Bridge 
BOOTPROTO=static 
BROADCAST=1xx.1xx.xx.xxx 
IPADDR=1xx.1xx.xx.xx 
NETMASK=255.255.255.0 
NETWORK=1xx.1xx.xx.0 
GATEWAY=1xx.1xx.xx.xxx 
ONBOOT=yes 




2、修改/etc/sysconfig/network-scripts/ifcfg-eth0 : 
DEVICE=eth0 
TYPE=Ethernet 
ONBOOT=yes 
BRIDGE=br0 

3、重启网络服务 
# /etc/rc.d/init.d/network restart 



为了确认网桥是否存在，运行： 

＃/usr/sbin/brctl show