11:26 a.m.
Thank you for your help!
1, i used vda as install disk and vdb as target disk, because i boot from the first. After
setup boot order flag i was able change install disk to vdb and target disk to vda. With
this configuration when i boot from vdb i can install OS with grub and after it redefine
XML without vdb without problem. Thanks a lot.
2, maybe i have something wrong, but still not working:
Now in libvirt log i got error: device not found: no target device vdb
but:
from VPS:
root@debian:~# ls /dev/vd*
/dev/vda /dev/vda1 /dev/vdb /dev/vdb1
from XML (virsh dumpxml):
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/users/debian-test2.img'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x01'
slot='0x00' function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/users/debian-test2-install.img'/>
<backingStore/>
<target dev='vdb' bus='virtio'/>
<boot order='1'/>
<alias name='virtio-disk1'/>
<address type='pci' domain='0x0000' bus='0x04'
slot='0x00' function='0x0'/>
</disk>
and from libvirt_domain_get_disk_devices($domain):
Array ( [0] => vda [1] => vdb [num] => 2 )
As you see, there is vdb device in all cases.
PHP code is very simple:
$server = libvirt_connect("qemu+tls://".$ip.“:“.$port."/system",
false);
$domain = libvirt_domain_lookup_by_name($server, "debian-test2");
libvirt_domain_disk_remove($domain,"vdb");
print_r(libvirt_get_last_error());
res: Unable to detach disk
2. 8. 2019 v 14:15, Michal Privoznik <mprivozn(a)redhat.com>:
On 8/1/19 10:12 AM, Jan Horak wrote:
> Hi all,
> i created a script in PHP for create a virtual server with two QCOW2 discs … one is
our system for installation and second is target system.
> After successfully instalation (create a blank Debian system, prepare all files and
grub partitions) i need a restart virtual without a installation disk.
> If i use Virsh:
> detach-disk --domain debian-test2 --persistent --target vda
> reset debian-test2
> everything works well.
> If i use a PHP, there is „complicated“ way and „simple“ way:
> 1, complicated:
> libvirt_domain_destroy($domain);
> libvirt_domain_undefine($domain);
> $xml = domain_create_xml($name,$uuid,$memory,$cpu,$vnc,$mac);
> $domain = libvirt_domain_define_xml($server->conn, $xml);
> libvirt_domain_disk_add($domain, "/users/".$name.".img",
"vdb", "virtio", "qcow2", NULL);
> libvirt_domain_create($domain);
> (or instead libvirt_domain_disk_add i can define disk directly in XML)
> But in this case, the server will not boot (GRUB error)
Question is, how GRUB refers to the disk where kernel is to be found. Also, I suspect it
is not GRUB that is complaining, but SeaBIOS which hasn't found any bootable device.
It's only an assumption becasue I don't know how domain_create_xml() works -
it's not a libvirt-php function. There are two possibilities here:
1) make sure domain_create_xml() sets boot devices
2) construct disk XML yourself, and put "<boot order='N'/>" into
it
> 2, simple:
> libvirt_domain_disk_remove($domain,“vda“);
> libvirt_domain_reboot($domain);
> The problem of this solution is thats not working. The remove disk is failing with
error „Unable attach disk“ - i looks to source code, and yes, there is a mystake with
„attach“/„detach“, but main problem i see in log from libvirt:
Oh, that's only typo in the error message. In fact the detach API is called. And it
fails.
> Aug 1 02:57:05 ry libvirtd[19051]: missing source information for device vda
> I try to put source detail to xml in source of PHP module
> libvirt-domain.c:
> 822 if (asprintf(&newXml,
> 823 " <disk type='file'
device='disk'>\n"
> 824 " <target dev='%s'/>\n"
> 825 " </disk>", dev) < 0) {
> 826 set_error("Out of memory" TSRMLS_CC);
> 827 goto error;
> 828 }
> but my attempts was unsuccesfull (i’m not C programmer).
Yes, this minimalistic XML is not good as detach API requires full device XML. I'll
fix this soon.
> Questions:
> A, why complicated way is not working and system dont want boot (GRUB error) if virsh
works fine
> B, why libvirt_domain_disk_remove is not work ? I use libvirt and libvirt-php latest
from git.
I've pushed fixes here:
Please give it a try.
Michal