8:12 a.m.
Hey Jim,
I'm on libvirt.git's trunk and I see the following:
[xen@ghoul3 libvirt.git]$ sudo ./tools/virsh list
Id Name State
----------------------------------------------------
3 debian_32 running
4 fedora20_64 running
[xen@ghoul3 libvirt.git]$ sudo ./tools/virsh console debian_32
Connected to domain debian_32
Escape character is ^]
error: internal error: cannot find character device (null)
[xen@ghoul3 libvirt.git]$ sudo ./tools/virsh console fedora20_64
Connected to domain fedora20_64
Escape character is ^]
error: internal error: cannot find character device (null)
And this:
[xen@ghoul3 libvirt.git]$ sudo ./daemon/libvirtd -v
[sudo] password for xen:
2013-12-17 13:19:35.366+0000: 22124: info : libvirt version: 1.2.1
2013-12-17 14:00:06.587+0000: 22122: error : libxlDomainOpenConsole:3885 : internal error:
cannot find character device (null)
2013-12-17 14:00:15.705+0000: 22125: error : libxlDomainOpenConsole:3885 : internal error:
cannot find character device (null)
What I have in /var/log/libvirt/libxl does not look useful, while below
it comes my xenstore-ls.
What is it that is going wrong?
[xen@ghoul3 libvirt.git]$ sudo xenstore-ls
tool = ""
xenstored = ""
local = ""
domain = ""
0 = ""
name = "Domain-0"
domid = "0"
device-model = ""
0 = ""
state = "running"
memory = ""
target = "13118716"
static-max = "4294967292"
freemem-slack = "317576"
libxl = ""
disable_udev = "1"
backend = ""
vbd = ""
3 = ""
51712 = ""
frontend = "/local/domain/3/device/vbd/51712"
params = "/dev/fedora_ghoul3/debian_32"
script = "/etc/xen/scripts/block"
physical-device = "fd:2"
frontend-id = "3"
online = "1"
removable = "1"
bootable = "1"
state = "4"
dev = "xvda"
type = "phy"
mode = "w"
device-type = "disk"
feature-flush-cache = "1"
feature-discard = "0"
feature-barrier = "1"
feature-persistent = "1"
feature-max-indirect-segments = "256"
sectors = "10485760"
info = "0"
sector-size = "512"
physical-sector-size = "512"
4 = ""
51712 = ""
frontend = "/local/domain/4/device/vbd/51712"
params = "/dev/fedora_ghoul3/fedora20_64"
script = "/etc/xen/scripts/block"
physical-device = "fd:3"
frontend-id = "4"
online = "1"
removable = "1"
bootable = "1"
state = "4"
dev = "xvda"
type = "phy"
mode = "w"
device-type = "disk"
feature-flush-cache = "1"
feature-discard = "0"
feature-barrier = "1"
feature-persistent = "1"
feature-max-indirect-segments = "256"
sectors = "10485760"
info = "0"
sector-size = "512"
physical-sector-size = "512"
console = ""
3 = ""
0 = ""
frontend = "/local/domain/3/console"
frontend-id = "3"
online = "1"
state = "1"
domain = "debian_32"
protocol = "vt100"
4 = ""
0 = ""
frontend = "/local/domain/4/console"
frontend-id = "4"
online = "1"
state = "1"
domain = "fedora20_64"
protocol = "vt100"
vif = ""
3 = ""
0 = ""
frontend = "/local/domain/3/device/vif/0"
frontend-id = "3"
online = "1"
state = "4"
script = "/etc/xen/scripts/vif-bridge"
mac = "00:16:3e:9f:ea:e6"
bridge = "virbr0"
handle = "0"
type = "vif"
feature-sg = "1"
feature-gso-tcpv4 = "1"
feature-rx-copy = "1"
feature-rx-flip = "0"
feature-split-event-channels = "1"
hotplug-status = "connected"
4 = ""
0 = ""
frontend = "/local/domain/4/device/vif/0"
frontend-id = "4"
online = "1"
state = "4"
script = "/etc/xen/scripts/vif-bridge"
mac = "00:16:3e:a8:fd:05"
bridge = "virbr0"
handle = "0"
type = "vif"
feature-sg = "1"
feature-gso-tcpv4 = "1"
feature-rx-copy = "1"
feature-rx-flip = "0"
feature-split-event-channels = "1"
hotplug-status = "connected"
3 = ""
vm = "/vm/d3c586b2-f26d-4671-a6b3-6782fa01f49f"
name = "debian_32"
cpu = ""
0 = ""
availability = "online"
1 = ""
availability = "online"
memory = ""
static-max = "1048576"
target = "1048577"
videoram = "-1"
device = ""
suspend = ""
event-channel = ""
vbd = ""
51712 = ""
backend = "/local/domain/0/backend/vbd/3/51712"
backend-id = "0"
state = "4"
virtual-device = "51712"
device-type = "disk"
protocol = "x86_32-abi"
ring-ref = "8"
event-channel = "15"
feature-persistent = "1"
vif = ""
0 = ""
backend = "/local/domain/0/backend/vif/3/0"
backend-id = "0"
state = "4"
handle = "0"
mac = "00:16:3e:9f:ea:e6"
tx-ring-ref = "9"
rx-ring-ref = "10"
event-channel-tx = "16"
event-channel-rx = "17"
request-rx-copy = "1"
feature-rx-notify = "1"
feature-sg = "1"
feature-gso-tcpv4 = "1"
control = ""
shutdown = ""
platform-feature-multiprocessor-suspend = "1"
platform-feature-xs_reset_watches = "1"
data = ""
domid = "3"
store = ""
port = "1"
ring-ref = "1353957"
console = ""
backend = "/local/domain/0/backend/console/3/0"
backend-id = "0"
limit = "1048576"
type = "xenconsoled"
output = "pty"
tty = "/dev/pts/2"
port = "2"
ring-ref = "2366273"
4 = ""
vm = "/vm/d02acb9a-e99e-42ca-b2a4-9e32a65b9a0f"
name = "fedora20_64"
cpu = ""
0 = ""
availability = "online"
1 = ""
availability = "online"
memory = ""
static-max = "2097152"
target = "2097153"
videoram = "-1"
device = ""
suspend = ""
event-channel = ""
vbd = ""
51712 = ""
backend = "/local/domain/0/backend/vbd/4/51712"
backend-id = "0"
state = "4"
virtual-device = "51712"
device-type = "disk"
protocol = "x86_64-abi"
ring-ref = "8"
event-channel = "15"
feature-persistent = "1"
vif = ""
0 = ""
backend = "/local/domain/0/backend/vif/4/0"
backend-id = "0"
state = "4"
handle = "0"
mac = "00:16:3e:a8:fd:05"
tx-ring-ref = "135"
rx-ring-ref = "136"
event-channel-tx = "16"
event-channel-rx = "17"
request-rx-copy = "1"
feature-rx-notify = "1"
feature-sg = "1"
feature-gso-tcpv4 = "1"
control = ""
shutdown = ""
platform-feature-multiprocessor-suspend = "1"
platform-feature-xs_reset_watches = "1"
data = ""
domid = "4"
store = ""
port = "1"
ring-ref = "2486615"
console = ""
backend = "/local/domain/0/backend/console/4/0"
backend-id = "0"
limit = "1048576"
type = "xenconsoled"
output = "pty"
tty = "/dev/pts/4"
port = "2"
ring-ref = "1364170"
vm = ""
00000000-0000-0000-0000-000000000000 = ""
memory = "12811"
d3c586b2-f26d-4671-a6b3-6782fa01f49f = ""
uuid = "d3c586b2-f26d-4671-a6b3-6782fa01f49f"
name = "debian_32"
image = ""
ostype = "linux"
kernel = "/var/run/xen/bootloader.3.d/boot_kernel.eYl1YW"
ramdisk = "/var/run/xen/bootloader.3.d/boot_ramdisk.BxZLo9"
cmdline = "root=UUID=9df3cd14-ed12-4cee-a252-d0cd29f75b55 ro quiet"
start_time = "1387288160.47"
d02acb9a-e99e-42ca-b2a4-9e32a65b9a0f = ""
uuid = "d02acb9a-e99e-42ca-b2a4-9e32a65b9a0f"
name = "fedora20_64"
image = ""
ostype = "linux"
kernel = "/var/run/xen/bootloader.4.d/boot_kernel.w1Ntxo"
ramdisk = "/var/run/xen/bootloader.4.d/boot_ramdisk.XU7an0"
cmdline = "root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/swap
rd.lvm.lv=fedora/root vconsole.font=latarcyrheb-sun16 LANG=en_US.UTF-8"
start_time = "1387288245.20"
libxl = ""
3 = ""
dm-version = "qemu_xen"
4 = ""
dm-version = "qemu_xen"
Regards,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
12:12 p.m.
Dario Faggioli wrote:
Hey Jim,
I'm on libvirt.git's trunk and I see the following:
[xen@ghoul3 libvirt.git]$ sudo ./tools/virsh list
Id Name State
----------------------------------------------------
3 debian_32 running
4 fedora20_64 running
[xen@ghoul3 libvirt.git]$ sudo ./tools/virsh console debian_32
Connected to domain debian_32
Escape character is ^]
error: internal error: cannot find character device (null)
[xen@ghoul3 libvirt.git]$ sudo ./tools/virsh console fedora20_64
Connected to domain fedora20_64
Escape character is ^]
error: internal error: cannot find character device (null)
Looking at libxlDomainOpenConsole() in src/libxl/libxl_driver.c, it
currently only supports a serial console. Do you have one defined in
these domains? E.g.
<devices>
...
<serial type='pty'>
<target port='0'/>
</serial>
...
</devices>
Regards,
Jim
12:22 p.m.
On mar, 2013-12-17 at 11:12 -0700, Jim Fehlig wrote:
Looking at libxlDomainOpenConsole() in src/libxl/libxl_driver.c, it
currently only supports a serial console. Do you have one defined in
these domains?
Well, I did not create anything like that explicitly for sure.. All I
did is using virt-install.
E.g.
<devices>
...
<serial type='pty'>
<target port='0'/>
</serial>
...
</devices>
Let me check.
[xen@ghoul3 libvirt.git]$ sudo ./run tools/virsh dumpxml debian_32
<domain type='xen'>
<name>debian_32</name>
<uuid>d3c586b2-f26d-4671-a6b3-6782fa01f49f</uuid>
<memory unit='KiB'>1048576</memory>
<currentMemory unit='KiB'>1048576</currentMemory>
<vcpu placement='static'>2</vcpu>
<bootloader>/usr/bin/pygrub</bootloader>
<os>
<type arch='x86_64' machine='xenpv'>linux</type>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<disk type='block' device='disk'>
<source dev='/dev/fedora_ghoul3/debian_32'/>
<target dev='xvda' bus='xen'/>
</disk>
<interface type='bridge'>
<mac address='00:16:3e:9f:ea:e6'/>
<source bridge='virbr0'/>
</interface>
</devices>
</domain>
No, I apparently don't have anything like that. So, whose bug is this?
libvirt or virt-install?
As an aside, I'm sure as hell I've seen this working at some point...
weird. :-/
Thanks and Regards,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
8:45 a.m.
Jim Fehlig writes ("Re: libxl: cannot connect to PV console"):
Dario Faggioli wrote:
> Hey Jim,
>
> I'm on libvirt.git's trunk and I see the following:
> [xen@ghoul3 libvirt.git]$ sudo ./tools/virsh list
> Id Name State
> ----------------------------------------------------
> 3 debian_32 running
> 4 fedora20_64 running
>
> [xen@ghoul3 libvirt.git]$ sudo ./tools/virsh console debian_32
> Connected to domain debian_32
> Escape character is ^]
> error: internal error: cannot find character device (null)
>
> [xen@ghoul3 libvirt.git]$ sudo ./tools/virsh console fedora20_64
> Connected to domain fedora20_64
> Escape character is ^]
> error: internal error: cannot find character device (null)
>
Looking at libxlDomainOpenConsole() in src/libxl/libxl_driver.c, it
currently only supports a serial console. Do you have one defined in
these domains? E.g.
If this is the root cause, it's a pretty bad error message. Should I
or Dario take a look at the libvirt code to see if we can improve it ?
Ian.
10:22 a.m.
On mer, 2013-12-18 at 14:45 +0000, Ian Jackson wrote:
Jim Fehlig writes ("Re: libxl: cannot connect to PV
console"):
> Dario Faggioli wrote:
> > [xen@ghoul3 libvirt.git]$ sudo ./tools/virsh console fedora20_64
> > Connected to domain fedora20_64
> > Escape character is ^]
> > error: internal error: cannot find character device (null)
> >
>
> Looking at libxlDomainOpenConsole() in src/libxl/libxl_driver.c, it
> currently only supports a serial console. Do you have one defined in
> these domains? E.g.
If this is the root cause, it's a pretty bad error message.
Indeed.
Should I
or Dario take a look at the libvirt code to see if we can improve it ?
Looks like it's this piece of code, in src/libxl/libxl_driver.c:
libxlDomainOpenConsole(..)
...
if (vm->def->nserials)
chr = vm->def->serials[0];
if (!chr) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot find character device %s"),
NULLSTR(dev_name));
goto cleanup;
}
...
}
I guess I can send a patch to turn that message into something like
"cannot find any serial console define for the domain", either always or
in the specific case where vm->def->serials[0] is NULL, as I feel like
the "character device (null)" part is the worst and most misleading.
At the same time, I'd be interested in figuring out why this does not
work / stopped working.
I'll investigate more.
Regards,
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
4214
days inactive
4215
days old
4 comments
3 participants
participants (3)
-
Dario Faggioli -
Ian Jackson -
Jim Fehlig