[Xen-users] DHCP server on Dom-0: guests fail to connect

[Siddharth Wagh <siddharth.wagh@xxxxxxxxx>]

Hello all,

I am working on a Centos 5.2 installation using Xen 3.0, and trying to set up a DHCP server on Domain-0 so as to assign a range of IP addresses to new guests. I installed dhcp package on Dom-0 and here are contents of dhcpd.conf file 

(Dom-0 has eth0 - 128.6.237.10 and eth1 - 192.168.2.21 over crossover cable):

===================================================
ddns-update-style interim;
ignore client-updates;
authoritative;

subnet 128.6.237.0 netmask 255.255.255.0 {

host eth0     {
        hardware ethernet  00:21:9B:FC:D9:E9;
        fixed-address      128.6.237.10;
}
}
subnet 192.168.2.0 netmask 255.255.255.0 {
host eth1   {
        hardware ethernet  00:21:9B:FC:D9:EA;

        fixed-address      192.168.2.21;
}
}

# range of addresses to be assigned to new guests

subnet 192.168.1.0 netmask 255.255.255.0 {
# --- default gateway
        option routers                  192.168.1.1;

        option subnet-mask              255.255.255.0;
        option domain-name              "dw.vnet";
        option domain-name-servers      128.6.236.5, 128.6.224.114;

        option time-offset              -18000; # Eastern Standard Time

        range 192.168.1.128 192.168.1.254;
}
        default-lease-time 21600;
        max-lease-time 43200;
                               
===============================================

/etc/init.d/dhcpd start

Starting DHCP  [OK]

Then I am trying to create a guest with config file:
================================================
name = "sw_cp_fed8"
maxmem = 512
memory = 512
vcpus = 4
bootloader = "/usr/bin/pygrub"

>>>#vfb = [ "type=vnc,vncunused=1,keymap=en-us" ]
disk = [ "tap:aio:/var/lib/xen/images/sw_cp_fed8.img,xvda,w" ]

vif = ['']
dhcp="dhcp"
================================================

But the guest fails to start
Error:
TCP/IP error: VNC connection to hypervisor host got refused

/var/log/messages says:

=================================================
Jun  3 11:42:13 darkwing kernel: tap tap-62-51712: 2 getting info
Jun  3 11:42:14 darkwing kernel: device vif62.0 entered promiscuous mode
Jun  3 11:42:14 darkwing kernel: ADDRCONF(NETDEV_UP): vif62.0: link is not ready

Jun  3 11:42:14 darkwing kernel: blktap: ring-ref 8, event-channel 17, protocol 1 (x86_64-abi)
Jun  3 11:42:25 darkwing kernel: virbr0: port 1(vif62.0) entering disabled state
Jun  3 11:42:25 darkwing kernel: device vif62.0 left promiscuous mode

Jun  3 11:42:25 darkwing kernel: virbr0: port 1(vif62.0) entering disabled state
================================================

I need to run about 10 Virtual machines allotted dynamic IPs from DHCP server on Dom-0. Then I am seeking to stress test them on the machine, to study performance isolation among guests.

Can anyone help and guide me? Am I on the right path?


Thanks & Regards,
Siddharth Wagh
MS, Electrical & Computer Engineering
Rutgers University, NJ
Web: http://www.eden.rutgers.edu/~swagh/


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