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Re: [Xen-users] NFS Boot

Hi Tom,
Sorry about the missing vif line in my previous post. I do have a vif line in my config file like "vif = [ 'mac=00:16:3e:20:5d:c9, bridge=xenbr0', ]". I think its going down even before bringing up eth0 (the complete boot log is attached to this mail). I am suspecting of the missing /dev/nfs in dom0, which is required for the 'root' parameter, as pointed out in xen user guide. 

Any suggestions ?

-Abhishek

Tom Brown wrote:

On Sun, 25 Feb 2007, Abhishek Gaurav wrote:
Hi, I am new to xen and am trying to boot a VM from an NFS server. I am using the default FC6-xen kernel and I do not have a /dev/nfs in dom0. My config file is : 

kernel = "/boot/vmlinuz-2.6.18-1.2798.fc6xen"
name = "test8"
memory = "512"
uuid = "2cc550ec-550a-6ad2-8121-7b089fc7d051"
vcpus=1
root = '/dev/nfs'
nfs_server = 'xx.xx.xx.xx'
nfs_root = '/home/xen-images/fc4'
if you're running a current version of xen you're going to need to specify a vif line to get a virtual network interface... 

vif = [ '' ]

should suffice.




I run into the following problem during boot:

TCP bic registered
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
XENBUS: Device with no driver: device/vif/0
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
VFS: Cannot open root device "nfs" or unknown-block(0,255)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255) 


Please let me know what is that I am doing wrong.
if there is no reference to eth0 in your boot messages, you're not going to have a network, without a network you're not going to have a network file system... 

-Tom



Bootdata ok (command line is  root=/dev/nfs 
nfsroot=136.159.8.14:/home/xen-images/fc4 )

Linux version 2.6.18-1.2798.fc6xen (brewbuilder@xxxxxxxxxxxxxxxxxxxxxxxxxxx) 
(gcc version 4.1.1 20061011 (Red Hat 4.1.1-30)) #1 SMP Mon Oct 16 14:59:01 EDT 
2006

BIOS-provided physical RAM map:

 Xen: 0000000000000000 - 0000000040800000 (usable)

No mptable found.

Built 1 zonelists.  Total pages: 264192

Kernel command line:  root=/dev/nfs nfsroot=136.159.8.14:/home/xen-images/fc4 

Initializing CPU#0

PID hash table entries: 4096 (order: 12, 32768 bytes)

Xen reported: 2400.084 MHz processor.

Console: colour dummy device 80x25

Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)

Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)

Software IO TLB disabled

Memory: 1021176k/1056768k available (2323k kernel code, 26756k reserved, 1328k 
data, 172k init)

Calibrating delay using timer specific routine.. 6002.15 BogoMIPS (lpj=12004302)

Security Framework v1.0.0 initialized

SELinux:  Initializing.

SELinux:  Starting in permissive mode

selinux_register_security:  Registering secondary module capability

Capability LSM initialized as secondary

Mount-cache hash table entries: 256

CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)

CPU: L2 Cache: 1024K (64 bytes/line)

CPU: Physical Processor ID: 1

CPU: Processor Core ID: 1

(SMP-)alternatives turned off

Brought up 1 CPUs

Grant table initialized

NET: Registered protocol family 16

Brought up 1 CPUs

PCI: setting up Xen PCI frontend stub

ACPI: Interpreter disabled.

Linux Plug and Play Support v0.97 (c) Adam Belay

pnp: PnP ACPI: disabled

xen_mem: Initialising balloon driver.

usbcore: registered new driver usbfs

usbcore: registered new driver hub

PCI: System does not support PCI

PCI: System does not support PCI

NetLabel: Initializing

NetLabel:  domain hash size = 128

NetLabel:  protocols = UNLABELED CIPSOv4

NetLabel:  unlabeled traffic allowed by default

NET: Registered protocol family 2

IP route cache hash table entries: 65536 (order: 7, 524288 bytes)

TCP established hash table entries: 131072 (order: 10, 4194304 bytes)

TCP bind hash table entries: 65536 (order: 9, 2097152 bytes)

TCP: Hash tables configured (established 131072 bind 65536)

TCP reno registered

IA-32 Microcode Update Driver: v1.14-xen <tigran@xxxxxxxxxxx>

audit: initializing netlink socket (disabled)

audit(1172464126.972:1): initialized

VFS: Disk quotas dquot_6.5.1

Dquot-cache hash table entries: 512 (order 0, 4096 bytes)

SELinux:  Registering netfilter hooks

Initializing Cryptographic API

ksign: Installing public key data

Loading keyring

- Added public key 4D36EEF71C3A3150

- User ID: Red Hat, Inc. (Kernel Module GPG key)

io scheduler noop registered

io scheduler anticipatory registered

io scheduler deadline registered

io scheduler cfq registered (default)

pci_hotplug: PCI Hot Plug PCI Core version: 0.5

rtc: IRQ 8 is not free.

Non-volatile memory driver v1.2

Linux agpgart interface v0.101 (c) Dave Jones

RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize

Xen virtual console successfully installed as xvc0

Bootdata ok (command line is  root=/dev/nfs 
nfsroot=136.159.8.14:/home/xen-images/fc4 )

Linux version 2.6.18-1.2798.fc6xen (brewbuilder@xxxxxxxxxxxxxxxxxxxxxxxxxxx) 
(gcc version 4.1.1 20061011 (Red Hat 4.1.1-30)) #1 SMP Mon Oct 16 14:59:01 EDT 
2006

BIOS-provided physical RAM map:

 Xen: 0000000000000000 - 0000000040800000 (usable)

No mptable found.

Built 1 zonelists.  Total pages: 264192

Kernel command line:  root=/dev/nfs nfsroot=136.159.8.14:/home/xen-images/fc4 

Initializing CPU#0

PID hash table entries: 4096 (order: 12, 32768 bytes)

Xen reported: 2400.084 MHz processor.

Console: colour dummy device 80x25

Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)

Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)

Software IO TLB disabled

Memory: 1021176k/1056768k available (2323k kernel code, 26756k reserved, 1328k 
data, 172k init)

Calibrating delay using timer specific routine.. 6002.15 BogoMIPS (lpj=12004302)

Security Framework v1.0.0 initialized

SELinux:  Initializing.

SELinux:  Starting in permissive mode

selinux_register_security:  Registering secondary module capability

Capability LSM initialized as secondary

Mount-cache hash table entries: 256

CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)

CPU: L2 Cache: 1024K (64 bytes/line)

CPU: Physical Processor ID: 1

CPU: Processor Core ID: 1

(SMP-)alternatives turned off

Brought up 1 CPUs

Grant table initialized

NET: Registered protocol family 16

Brought up 1 CPUs

PCI: setting up Xen PCI frontend stub

ACPI: Interpreter disabled.

Linux Plug and Play Support v0.97 (c) Adam Belay

pnp: PnP ACPI: disabled

xen_mem: Initialising balloon driver.

usbcore: registered new driver usbfs

usbcore: registered new driver hub

PCI: System does not support PCI

PCI: System does not support PCI

NetLabel: Initializing

NetLabel:  domain hash size = 128

NetLabel:  protocols = UNLABELED CIPSOv4

NetLabel:  unlabeled traffic allowed by default

NET: Registered protocol family 2

IP route cache hash table entries: 65536 (order: 7, 524288 bytes)

TCP established hash table entries: 131072 (order: 10, 4194304 bytes)

TCP bind hash table entries: 65536 (order: 9, 2097152 bytes)

TCP: Hash tables configured (established 131072 bind 65536)

TCP reno registered

IA-32 Microcode Update Driver: v1.14-xen <tigran@xxxxxxxxxxx>

audit: initializing netlink socket (disabled)

audit(1172464126.972:1): initialized

VFS: Disk quotas dquot_6.5.1

Dquot-cache hash table entries: 512 (order 0, 4096 bytes)

SELinux:  Registering netfilter hooks

Initializing Cryptographic API

ksign: Installing public key data

Loading keyring

- Added public key 4D36EEF71C3A3150

- User ID: Red Hat, Inc. (Kernel Module GPG key)

io scheduler noop registered

io scheduler anticipatory registered

io scheduler deadline registered

io scheduler cfq registered (default)

pci_hotplug: PCI Hot Plug PCI Core version: 0.5

rtc: IRQ 8 is not free.

Non-volatile memory driver v1.2

Linux agpgart interface v0.101 (c) Dave Jones

RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize

Xen virtual console successfully installed as xvc0

Event-channel device installed.

Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2

ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx

ide-floppy driver 0.99.newide

usbcore: registered new driver libusual

usbcore: registered new driver hiddev

usbcore: registered new driver usbhid

drivers/usb/input/hid-core.c: v2.6:USB HID core driver

PNP: No PS/2 controller found. Probing ports directly.

i8042.c: No controller found.

mice: PS/2 mouse device common for all mice

md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27

md: bitmap version 4.39

TCP bic registered

Initializing IPsec netlink socket

NET: Registered protocol family 1

NET: Registered protocol family 17

XENBUS: Device with no driver: device/vif/0

md: Autodetecting RAID arrays.

md: autorun ...

md: ... autorun DONE.

VFS: Cannot open root device "nfs" or unknown-block(0,255)

Please append a correct "root=" boot option

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255)

 
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