Red Hat LINUX VIRTUAL SERVER 5.1 - ADMINISTRATION Guida di Installazione Scaricare il pdf (Pagina 137)

Nearly all new BIOSes allow enabling or disabling of the No eXecute bit. However, if

disabled, some CPUs do not report this flag and thus lib virt detects a different CPU.

Enabling this functionality instructs lib virt to report the correct CPU. Refer to your

hardware documentation for further instructions on this subject.

B.4 . Guest st art ing fails wit h error: mo ni to r so cket d i d no t sho w up

Symp t o m

The guest virtual machine (or domain) starting fails with this error (or similar):

# virsh -c qemu:///system create name_of_guest.xml error: Failed

to create domain from name_of_guest.xml error: monitor socket did

not show up.: Connection refused

In vest ig at io n

This error message shows:

1. lib virt is working;

2. The Q EMU process failed to start up; and

3. lib virt quits when trying to connect Q EMU or the QEMU agent monitor socket.

To understand the error details, examine the guest log:

# cat /var/log/libvirt/qemu/name_of_guest.log

LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none

/usr/bin/qemu-kvm -S -M pc -enable-kvm -m 768 -smp

1,sockets=1,cores=1,threads=1 -name name_of_guest -uuid ebfaadbe-

e908-ba92-fdb8-3fa2db557a42 -nodefaults -chardev

socket,id=monitor,path=/var/lib/libvirt/qemu/name_of_guest.monito

r,server,nowait -mon chardev=monitor,mode=readline -no-reboot -

boot c -kernel /var/lib/libvirt/boot/vmlinuz -initrd

/var/lib/libvirt/boot/initrd.img -append

method=http://www.example.com/pub/product/release/version/x86_64/

os/ -drive

file=/var/lib/libvirt/images/name_of_guest.img,if=none,id=drive-

ide0-0-0,boot=on -device ide-drive,bus=ide.0,unit=0,drive=drive-

ide0-0-0,id=ide0-0-0 -device virtio-net-

pci,vlan=0,id=net0,mac=52:40:00:f4:f1:0a,bus=pci.0,addr=0x4 -net

tap,fd=42,vlan=0,name=hostnet0 -chardev pty,id=serial0 -device

isa-serial,chardev=serial0 -usb -vnc 127.0.0.1:0 -k en-gb -vga

cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,

addr=0x3

char device redirected to /dev/pts/1

qemu: could not load kernel '/var/lib/libvirt/boot/vmlinuz':

Permission denied

So lu t io n

The guest log contains the details needed to fix the error.

If a host is shut down while the guest is still running a lib virt version prior to 0.9.5, the

libvirt-guest's init script attempts to perform a managed save of the guest. If the managed

Common libvirt errors and t roublesh oot ing

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