Hi,
My nova-compute nodes was running libvirt 0.9.13 and QEMU 1.0, after libvirt was upgraded to 1.2.2, the VMs launched by libvirt 0.9.13 can't attach volume any more, i.e. "nova volume-attach <vm-uuid> <volume-uuid>" doesn't work. But before the libvirt upgrade, the same VM can attach volume disk.
I did some debuging and find that, it failed in QEMU when try to open the volume device, and the return errno is EPERM. QEMU instances is running as user libvirt-qemu always, so is that possible some problem in Linux capabilites or libvirt apparmor?
-------------------------------------
int qemu_open(const char *name, int flags, ...)
{
int ret;
int mode = 0;
long euid, egid;
if (flags & O_CREAT) {
va_list ap;
va_start(ap, flags);
mode = va_arg(ap, int);
va_end(ap);
}
euid = (long)geteuid();
egid = (long)getegid();
#ifdef O_CLOEXEC
ret = open(name, flags | O_CLOEXEC, mode);
#else
ret = open(name, flags, mode);
if (ret >= 0) {
qemu_set_cloexec(ret);
}
#endif
return ret;
}
Regards,
CY.
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