I''m running RHEL 4 with a Xen package compiled from source. Everything
boots into the xen kernel properly.
I followed the Xen User Guide for configuration options and installed
Xen into a flat file.
Now, when booting the system, I regularly get this error:
[root@ims-devhost-1 ~]# xm create -c ims-mp7i vmid=2
Using config file "/etc/xen/ims-mp7i".
Started domain VM2
Unexpected error: exceptions.OSError
Please report to xen-devel@lists.xensource.com
Traceback (most recent call last):
File "/usr/sbin/xm", line 10, in ?
main.main(sys.argv)
File "//usr/lib64/python/xen/xm/main.py", line 2453, in main
_, rc = _run_cmd(cmd, cmd_name, args)
File "//usr/lib64/python/xen/xm/main.py", line 2477, in _run_cmd
return True, cmd(args)
File "<string>", line 1, in <lambda>
File "//usr/lib64/python/xen/xm/main.py", line 1266, in
xm_importcommand
cmd.main([command] + args)
File "//usr/lib64/python/xen/xm/create.py", line 1292, in main
do_console(sxp.child_value(config, ''name'', -1))
File "//usr/lib64/python/xen/xm/create.py", line 1317, in do_console
(p, rv) = os.waitpid(cpid, os.WNOHANG)
OSError: [Errno 10] No child processes
[root@ims-devhost-1 ~]#
In addition, when this error doesn''t occur, the system won''t
boot anyway.
Here is my configuration file:
[root@ims-devhost-1 ~]# !cat
cat /etc/xen/ims-mp7i
# -*- mode: python; -*-
#===========================================================================#
Example Python setup script for ''xm create''.
# This script sets the parameters used when a domain is created using
''xm create''.
#
# This is a relatively advanced script that uses a parameter, vmid, to
control
# the settings. So this script can be used to start a set of domains by
# setting the vmid parameter on the ''xm create'' command line.
For example:
#
# xm create vmid=1
# xm create vmid=2
# xm create vmid=3
#
# The vmid is purely a script variable, and has no effect on the the domain
# id assigned to the new domain.
#===========================================================================
# Define script variables here.
# xm_vars is defined automatically, use xm_vars.var() to define a variable.
# This function checks that ''vmid'' has been given a valid
value.
# It is called automatically by ''xm create''.
def vmid_check(var, val):
val = int(val)
if val <= 0:
raise ValueError
return val
# Define the ''vmid'' variable so that ''xm
create'' knows about it.
xm_vars.var(''vmid'',
use="Virtual machine id. Integer greater than 0.",
check=vmid_check)
# Check the defined variables have valid values..
xm_vars.check()
#----------------------------------------------------------------------------
# Kernel image file.
kernel = "/boot/vmlinuz-2.6.9-55.ELxenU"
# Optional ramdisk.
#ramdisk = "/boot/initrd.gz"
# 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 = 1024
# A name for the new domain. All domains have to have different names,
# so we use the vmid to create a name.
name = "VM%d" % vmid
# 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" # run on cpus 0,2,3,5
#cpus = "%s" % vmid # set based on vmid (mod number of CPUs)
# Number of Virtual CPUS to use, default is 1
#vcpus = 1
vcpus = 4 # make your domain a 4-way
#----------------------------------------------------------------------------
# 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'' ]
#vif = [ ''mac=00:16:3e:00:00:11, bridge=bond0'' ]
#
# 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.
# This makes the disk device depend on the vmid - assuming
# that devices sda7, sda8 etc. exist. The device is exported
# to all domains as sda1.
# All domains get sda6 read-only (to use for /usr, see below).
#disk = [''tap:aio:/home/Virts/ims-mp7i,sda1,w'']
disk = [''tap:aio:/home/Virts/ims-mp7i,xvda1,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=%d'' % vmid
]
#
# Or you can bind the first unused port above 5900:
#
# vfb = [ ''type=vnc,vnclisten=0.0.0.0,vnunused=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=%d,backend=0'' % (vmid) ]
#----------------------------------------------------------------------------
# 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 = "/dev/xvda1 ro"
# Root device for nfs.
#root = "/dev/nfs"
# The nfs server.
#nfs_server = ''169.254.1.0''
# Root directory on the nfs server.
#nfs_root = ''/full/path/to/root/directory''
# Sets runlevel 4 and the device for /usr.
#extra = "4 VMID=%d usr=/dev/sda6" % vmid
extra = "4 VMID=%d " % vmid
#----------------------------------------------------------------------------
# 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.
#
# 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''
#===========================================================================[root@ims-devhost-1
~]#
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