Hi,
I am trying out Xen for the first time and I am having a few problems
with getting it working. The computer is a quad core Intel Xeon with VT
enabled, 8gb of RAM and 2 x 15,000rpm SAS drives in RAID1.
I have installed CentOS 5 64bit and installed Xen 3.3.0 via yum. I have
successfully booted in to dom0. Here is my grub.conf on dom0:
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this
file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/sda2
# initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-92.1.22.el5xen)
root (hd0,0)
kernel /xen.gz-3.3.0
module /vmlinuz-2.6.18-92.1.22.el5xen ro root=LABEL=/
module /initrd-2.6.18-92.1.22.el5xen.img
title CentOS (2.6.18-92.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-92.el5 ro root=LABEL=/
initrd /initrd-2.6.18-92.el5.img
However, I can't for the life of me install a guest domain. I have been
Googling for the last 3 days and I am extremely confused - it seems like
there are multiple ways to do it but none are working for me.
I am wanting to use file-based HDD's for the guests, and I want to
install off an iso of CentOS5 on my HDD for now.
First I tried using the "virt-install" script. Firstly, should I be able
to install a fully virtualized guest or will only para-virtualized work?
I will show what happens when I try both.
Firstly, if I try to install it as a paravirtualized guest I am running
this command:
virt-install -n test1 -r 512 -f /vm/test1.img -s 5
--location=/vm/CentOS-5.2-x86_64-bin-DVD.iso
This creates the domain fine and starts what I assume is the CentOS
installation - it asks me to first select a language, once I have done
that it says "What type of media contains the packages to be installed?"
and gives me a list of Local CDROM, Hard drive, NFS, FTP and HTTP. What
is this asking me for? If it has already started the installation then
surely it knows where to get the packages from? Anyway, if I select
Local CDROM it says "Unable to find any devices of the type needed for
this installation type. Would you like to manually select your driver or
use a driver disk?" I have got no idea what to do from here.
If I try to install a fully virtualized guest using virt-install, here
is the command I am running:
virt-install -n test1 -r 512 -f /vm/test1.img -s 5
--location=/vm/CentOS-5.2-x86_64-bin-DVD.iso --hvm
This comes up and it just hangs here:
Starting install...
Creating storage file... 100% |=========================| 5.0 GB 00:00
Creating domain... 0 B 00:00
▒
My xend-debug.log file says this:
XendInvalidDomain: <Fault 3: 'b5e19b10-7540-902c-b585-f8783447521f'>
Traceback (most recent call last):
File "/usr/lib64/python2.4/site-packages/xen/web/httpserver.py", line
140, in process
resource = self.getResource()
File "/usr/lib64/python2.4/site-packages/xen/web/httpserver.py", line
172, in getResource
return self.getServer().getResource(self)
File "/usr/lib64/python2.4/site-packages/xen/web/httpserver.py", line
351, in getResource
return self.root.getRequestResource(req)
File "/usr/lib64/python2.4/site-packages/xen/web/resource.py", line 39,
in getRequestResource
return findResource(self, req)
File "/usr/lib64/python2.4/site-packages/xen/web/resource.py", line 26,
in findResource
next = resource.getPathResource(pathElement, request)
File "/usr/lib64/python2.4/site-packages/xen/web/resource.py", line 49,
in getPathResource
val = self.getChild(path, request)
File "/usr/lib64/python2.4/site-packages/xen/web/SrvDir.py", line 71, in
getChild
val = self.get(x)
File
"/usr/lib64/python2.4/site-packages/xen/xend/server/SrvDomainDir.py",
line 52, in get
return self.domain(x)
File
"/usr/lib64/python2.4/site-packages/xen/xend/server/SrvDomainDir.py",
line 44, in domain
dom = self.xd.domain_lookup(x)
File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomain.py", line
529, in domain_lookup
raise XendInvalidDomain(str(domid))
XendInvalidDomain: <Fault 3: 'test1'>
So, now I try doing what looks like the manual way - creating a config
file in /etc/xen and using xm create.
First I create a file for the HDD:
dd if=/dev/zero of=test1.img bs=1M count=1 seek=1023
Then I created this config file and placed it at /etc/xen/test:
# -*- mode: python; -*-
#============================================================================
# Python configuration setup for 'xm create'.
# This script sets the parameters used when a domain is created using
'xm create'.
# You use a separate script for each domain you want to create, or
# you can set the parameters for the domain on the xm command line.
#============================================================================
#----------------------------------------------------------------------------
# Kernel image file.
kernel = "/boot/vmlinuz-2.6.18-92.1.22.el5xen"
# Optional ramdisk.
#ramdisk = "/boot/initrd.gz"
ramdisk = "/boot/initrd-2.6.18-92.1.22.el5xen.img"
#ramdisk = "/boot/initrd-centos5-xen.img"
# The domain build function. Default is 'linux'.
#builder='linux'
# Initial memory allocation (in megabytes) for the new domain.
#
# WARNING: Creating a domain with insufficient memory may cause out of
# memory errors. The domain needs enough memory to boot kernel
# and modules. Allocating less than 32MBs is not recommended.
memory = 512
# A name for your domain. All domains must have different names.
name = "Test1"
# 128-bit UUID for the domain. The default behavior is to generate a
new UUID
# on each call to 'xm create'.
#uuid = "06ed00fe-1162-4fc4-b5d8-11993ee4a8b9"
# List of which CPUS this domain is allowed to use, default Xen picks
#cpus = "" # leave to Xen to pick
#cpus = "0" # all vcpus run on CPU0
#cpus = "0-3,5,^1" # all vcpus run on cpus 0,2,3,5
#cpus = ["2", "3"] # VCPU0 runs on CPU2, VCPU1 runs on CPU3
# Number of Virtual CPUS to use, default is 1
#vcpus = 1
#----------------------------------------------------------------------------
# Define network interfaces.
# By default, no network interfaces are configured. You may have one
created
# with sensible defaults using an empty vif clause:
#
# vif = [ '' ]
#
# or optionally override backend, bridge, ip, mac, script, type, or
vifname:
#
# vif = [ 'mac=00:16:3e:00:00:11, bridge=xenbr0' ]
#
# or more than one interface may be configured:
#
# vif = [ '', 'bridge=xenbr1' ]
vif = [ '' ]
#----------------------------------------------------------------------------
# Define the disk devices you want the domain to have access to, and
# what you want them accessible as.
# Each disk entry is of the form phy:UNAME,DEV,MODE
# where UNAME is the device, DEV is the device name the domain will see,
# and MODE is r for read-only, w for read-write.
#disk = [ 'phy:hda1,hda1,w' ]
#disk = [ 'file:/vm/test1.img,ioemu:sda1,w',
'phy:/dev/cdrom,hdc:cdrom,r' ]
disk = [ 'file:/vm/test1.img,ioemu:sda1,w' ]
#----------------------------------------------------------------------------
# Define frame buffer device.
#
# By default, no frame buffer device is configured.
#
# To create one using the SDL backend and sensible defaults:
#
# vfb = [ 'type=sdl' ]
#
# This uses environment variables XAUTHORITY and DISPLAY. You
# can override that:
#
# vfb = [ 'type=sdl,xauthority=/home/bozo/.Xauthority,display=:1' ]
#
# To create one using the VNC backend and sensible defaults:
#
# vfb = [ 'type=vnc' ]
#
# The backend listens on 127.0.0.1 port 5900+N by default, where N is
# the domain ID. You can override both address and N:
#
# vfb = [ 'type=vnc,vnclisten=127.0.0.1,vncdisplay=1' ]
#
# Or you can bind the first unused port above 5900:
#
# vfb = [ 'type=vnc,vnclisten=0.0.0.0,vncunused=1' ]
#
# You can override the password:
#
# vfb = [ 'type=vnc,vncpasswd=MYPASSWD' ]
#
# Empty password disables authentication. Defaults to the vncpasswd
# configured in xend-config.sxp.
#----------------------------------------------------------------------------
# Define to which TPM instance the user domain should communicate.
# The vtpm entry is of the form 'instance=INSTANCE,backend=DOM'
# where INSTANCE indicates the instance number of the TPM the VM
# should be talking to and DOM provides the domain where the backend
# is located.
# Note that no two virtual machines should try to connect to the same
# TPM instance. The handling of all TPM instances does require
# some management effort in so far that VM configration files (and thus
# a VM) should be associated with a TPM instance throughout the lifetime
# of the VM / VM configuration file. The instance number must be
# greater or equal to 1.
#vtpm = [ 'instance=1,backend=0' ]
#----------------------------------------------------------------------------
# Set the kernel command line for the new domain.
# You only need to define the IP parameters and hostname if the domain's
# IP config doesn't, e.g. in ifcfg-eth0 or via DHCP.
# You can use 'extra' to set the runlevel and custom environment
# variables used by custom rc scripts (e.g. VMID=, usr= ).
# Set if you want dhcp to allocate the IP address.
#dhcp="dhcp"
# Set netmask.
#netmask=
# Set default gateway.
#gateway=
# Set the hostname.
#hostname= "vm%d" % vmid
# Set root device.
root = "/dev/sda1 ro"
# Root device for nfs.
#root = "/dev/nfs"
# The nfs server.
#nfs_server = '192.0.2.1'
# Root directory on the nfs server.
#nfs_root = '/full/path/to/root/directory'
# Sets runlevel 4.
extra = "4"
#----------------------------------------------------------------------------
# Configure the behaviour when a domain exits. There are three 'reasons'
# for a domain to stop: poweroff, reboot, and crash. For each of these you
# may specify:
#
# "destroy", meaning that the domain is cleaned up as normal;
# "restart", meaning that a new domain is started in place of the old
# one;
# "preserve", meaning that no clean-up is done until the domain is
# manually destroyed (using xm destroy, for example); or
# "rename-restart", meaning that the old domain is not cleaned up, but is
# renamed and a new domain started in its place.
#
# In the event a domain stops due to a crash, you have the additional
options:
#
# "coredump-destroy", meaning dump the crashed domain's core and then
destroy;
# "coredump-restart', meaning dump the crashed domain's core and the
restart.
#
# The default is
#
# on_poweroff = 'destroy'
# on_reboot = 'restart'
# on_crash = 'restart'
#
# For backwards compatibility we also support the deprecated option
restart
#
# restart = 'onreboot' means on_poweroff = 'destroy'
# on_reboot = 'restart'
# on_crash = 'destroy'
#
# restart = 'always' means on_poweroff = 'restart'
# on_reboot = 'restart'
# on_crash = 'restart'
#
# restart = 'never' means on_poweroff = 'destroy'
# on_reboot = 'destroy'
# on_crash = 'destroy'
#on_poweroff = 'destroy'
#on_reboot = 'restart'
#on_crash = 'restart'
#-----------------------------------------------------------------------------
# Configure PVSCSI devices:
#
#vscsi=[ 'PDEV, VDEV' ]
#
# PDEV gives physical SCSI device to be attached to specified guest
# domain by one of the following identifier format.
# - XX:XX:XX:XX (4-tuples with decimal notation which shows
# "host:channel:target:lun")
# - /dev/sdxx or sdx
# - /dev/stxx or stx
# - /dev/sgxx or sgx
# - result of 'scsi_id -gu -s'.
# ex. # scsi_id -gu -s /block/sdb
# 36000b5d0006a0000006a0257004c0000
#
# VDEV gives virtual SCSI device by 4-tuples (XX:XX:XX:XX) as
# which the specified guest domain recognize.
#
#vscsi = [ '/dev/sdx, 0:0:0:0' ]
#============================================================================
I then ran this command:
xm create -c test1
And this is the last few lines of the output before it stops:
Scanning and configuring dmraid supported devices
Creating root device.
Mounting root filesystem.
mount: could not find filesystem '/dev/root'
Setting up other filesystems.
Setting up new root fs
setuproot: moving /dev failed: No such file or directory
no fstab.sys, mounting internal defaults
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init!
So I am utterly stumped and extremely frustrated by now that I cannot
get something that is seemingly simple to work!
Any advise and help would be very greatly appreciated!
Thanks in advance :)
Andrew
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