Difference between revisions of "Lustre install for Unit.tv"

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* for every pair of JBOD, connect network cable directly to each other
 
* for every pair of JBOD, connect network cable directly to each other
  
−
== Installation Steps ==
+
Install Cobbler
−
1. install cobbler
+
<syntaxhighlight>
−
 
+
  17  yum install httpd dhcp bind
−
1.1 follow the steps on wiki
+
  18  yum install syslinux
−
 
+
  19  vim /etc/sysconfig/dhcpd
−
1.2 check all services are running, httpd, dhcpd, xinetd, cobblerd
+
  20  history
−
 
+
[root@iml-utv ieel-2.2.0.0]# cat /etc/sysconfig/dhcpd
−
1.3 open the ports for cobbler and disable SELINUX
+
# Command line options here
 +
DHCPDARGS=eth1
 +
install epel repo
 +
## RHEL/CentOS 6 64-Bit ##
 +
# wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
 +
# rpm -ivh epel-release-6-8.noarch.rpm
 +
</syntaxhighlight>
 +
install cobbler
 +
<syntaxhighlight>
 +
yum install cobbler cobbler-web
 +
for debian system deployment support
 +
  36  yum install debmirror
 +
  37  yum install pykickstart
 +
</syntaxhighlight>
 +
set iptables and selinux for cobbler refer to here
 +
when using virt-manager, interfaces should be br0, br1
 +
<syntaxhighlight>
 +
[root@iml-utv ieel-2.2.0.0]# setenforce 0
 +
</syntaxhighlight>
 +
setenforce: SELinux is disabled
 
<syntaxhighlight>
 
<syntaxhighlight>
−
[root@localhost ~]# cat /etc/sysconfig/iptables
+
[root@iml-utv conf.d]# cat /etc/sysconfig/iptables
−
# Generated by iptables-save v1.4.7 on Wed Jul  8 16:37:31 2015
 
 
*nat
 
*nat
 
:PREROUTING ACCEPT [0:0]
 
:PREROUTING ACCEPT [0:0]
 
:POSTROUTING ACCEPT [44:2156]
 
:POSTROUTING ACCEPT [44:2156]
 
:OUTPUT ACCEPT [48:2352]
 
:OUTPUT ACCEPT [48:2352]
−
-A POSTROUTING -o eth1 -j MASQUERADE  
+
-A POSTROUTING -o eth0 -j MASQUERADE  
 
COMMIT
 
COMMIT
−
# Completed on Wed Jul  8 16:37:31 2015
 
−
# Generated by iptables-save v1.4.7 on Wed Jul  8 16:37:31 2015
 
 
*filter
 
*filter
 
:INPUT ACCEPT [0:0]
 
:INPUT ACCEPT [0:0]
Line 124: Line 140:
 
-A FORWARD -i eth0 -o eth1 -j ACCEPT  
 
-A FORWARD -i eth0 -o eth1 -j ACCEPT  
 
COMMIT
 
COMMIT
−
# Completed on Wed Jul  8 16:37:31 2015
 
−
 
 
</syntaxhighlight>
 
</syntaxhighlight>
−
1.4 enable traffic forwarding
+
for tftp:
 +
<syntaxhighlight>
 +
[root@iml-utv conf.d]# cat /etc/sysconfig/iptables-config
 +
# Load additional iptables modules (nat helpers)
 +
#  Default: -none-
 +
# Space separated list of nat helpers (e.g. 'ip_nat_ftp ip_nat_irc'), which
 +
# are loaded after the firewall rules are applied. Options for the helpers are
 +
# stored in /etc/modprobe.conf.
 +
IPTABLES_MODULES="ip_conntrack ip_conntrack_tftp"
 +
</syntaxhighlight>
 +
xinetd:
 
<syntaxhighlight>
 
<syntaxhighlight>
−
[root@localhost ~]# cat /etc/rc.local
+
cat /etc/xinetd.d/rsync
−
#!/bin/sh
+
# default: off
−
#
+
# description: The rsync server is a good addition to an ftp server, as it \
−
# This script will be executed *after* all the other init scripts.
+
# allows crc checksumming etc.
−
# You can put your own initialization stuff in here if you don't
+
service rsync
−
# want to do the full Sys V style init stuff.
+
{
−
 
+
disable = no
−
touch /var/lock/subsys/local
+
flags = IPv6
−
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
+
socket_type    = stream
−
iptables -A FORWARD -i eth0 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT
+
wait            = no
−
iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
+
user            = root
 +
server          = /usr/bin/rsync
 +
server_args    = --daemon
 +
log_on_failure  += USERID
 +
}
 
</syntaxhighlight>
 
</syntaxhighlight>
−
 
+
Edit /etc/debmirror.conf and comment dists and arches lines
−
reference content for kickstart file to do the partition:
+
Edit /etc/cobbler/settings to be:
 
<syntaxhighlight>
 
<syntaxhighlight>
−
# Allow anaconda to partition the system as needed
+
# set to 1 to enable Cobbler's DHCP management features.
−
clearpart --all
+
# the choice of DHCP management engine is in /etc/cobbler/modules.conf
 +
manage_dhcp: 1
  
−
part raid.sda1  --asprimary    --fstype="raid" --ondisk=sda    --size=512
+
# set to 1 to enable Cobbler's DNS management features.
−
part raid.sda2  --asprimary    --fstype="raid" --ondisk=sda    --size=20000
+
# the choice of DNS mangement engine is in /etc/cobbler/modules.conf
−
part raid.sda3                  --fstype="raid" --ondisk=sda    --size=5000
+
manage_dns: 1
−
part raid.sda4                  --fstype="raid" --ondisk=sda    --size=10000
 
−
part raid.sda5                  --fstype="raid" --ondisk=sda    --size=5000
 
−
part raid.sda6                  --fstype="raid" --ondisk=sda    --size=64000
 
−
part raid.sda7                  --fstype="raid" --ondisk=sda    --size=1       --grow
 
  
−
part raid.sdb1 --asprimary      --fstype="raid" --ondisk=sdb    --size=512
+
next_server: 172.105.0.1
−
part raid.sdb2 --asprimary      --fstype="raid" --ondisk=sdb    --size=20000
+
server: 172.105.0.1
−
part raid.sdb3                  --fstype="raid" --ondisk=sdb    --size=5000
 
−
part raid.sdb4                  --fstype="raid" --ondisk=sdb    --size=10000
 
−
part raid.sdb5                  --fstype="raid" --ondisk=sdb    --size=5000
 
−
part raid.sdb6                  --fstype="raid" --ondisk=sdb    --size=64000
 
−
part raid.sdb7                  --fstype="raid" --ondisk=sdb    --size=1       --grow
 
  
−
raid /boot              --device=md0 --fstype="ext4" --level=RAID1 raid.sda1 raid.sdb1
+
pxe_just_once: 1  # to avoid reinstall looping
−
raid /                  --device=md1 --fstype="ext4" --level=RAID1 raid.sda2 raid.sdb2
+
edit /etc/cobbler/dhcp.template:
−
raid /tmp              --device=md2 --fstype="ext4" --level=RAID1 raid.sda3 raid.sdb3
+
cat /etc/cobbler/dhcp.template
−
raid /var              --device=md3 --fstype="ext4" --level=RAID1 raid.sda4 raid.sdb4
+
subnet 172.105.0.0 netmask 255.255.0.0 {
−
raid /usr/vice/cache    --device=md4 --fstype="ext4" --level=RAID1 raid.sda5 raid.sdb5
+
    option routers            172.105.0.1;
−
raid /swap              --device=md5 --fstype="swap" --level=RAID1 raid.sda6 raid.sdb6
+
    option domain-name-servers 172.105.0.1;
−
raid /pool              --device=md6 --fstype="ext4" --level=RAID0 raid.sda7 raid.sdb7
+
    option subnet-mask        255.255.0.0;
 +
    range dynamic-bootp        172.105.0.100 172.105.0.200;
 +
    default-lease-time        21600;
 +
    max-lease-time            43200;
 +
    next-server                $next_server;
 +
    class "pxeclients" {
 +
          match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
 +
          if option pxe-system-type = 00:02 {
 +
                  filename "ia64/elilo.efi";
 +
          } else if option pxe-system-type = 00:06 {
 +
                  filename "grub/grub-x86.efi";
 +
          } else if option pxe-system-type = 00:07 {
 +
                  filename "grub/grub-x86_64.efi";
 +
          } else {
 +
                  filename "pxelinux.0";
 +
          }
 +
    }
  
 +
}
 +
</syntaxhighlight>
 +
dhcpd.conf
 +
<syntaxhighlight>
 +
[root@iml-utv ieel-2.2.0.0]# cat /etc/dhcp/dhcpd.conf
 +
#
 +
# DHCP Server Configuration file.
 +
#  see /usr/share/doc/dhcp*/dhcpd.conf.sample
 +
#  see 'man 5 dhcpd.conf'
 +
#
 +
#
 +
subnet 172.105.0.0 netmask 255.255.0.0 {
 +
    option routers            172.105.0.1;
 +
    option domain-name-servers 172.105.0.1;
 +
    option subnet-mask        255.255.0.0;
 +
    range dynamic-bootp        172.105.0.100 172.105.0.200;
 +
    default-lease-time        21600;
 +
    max-lease-time            43200;
 +
    next-server                172.105.0.1;
 +
    filename "pxelinux.0";
  
 +
}
 
</syntaxhighlight>
 
</syntaxhighlight>
 +
disable dhcpd for virt-manager
 +
In this example i wanted to run a virtual DHCP server on the KVM system. The KVM server was getting in the way as it run a DHCP service also. To disable, remove the <dhcp> tags from the file /var/lib/libvirt/network/default.xml
 +
Change from:
 +
<syntaxhighlight>
 +
<network>
 +
  <name>default</name>
 +
  <uuid>319d4ae5-4b6e-433c-832f-ad20269ed495</uuid>
 +
  <forward mode='nat'/>
 +
  <bridge name='virbr0' stp='on' delay='0' />
 +
  <mac address='52:54:00:09:89:76'/>
 +
  <ip address='192.168.122.1' netmask='255.255.255.0'>
 +
    <dhcp>
 +
      <range start='192.168.122.2' end='192.168.122.254' />
 +
    </dhcp>
 +
  </ip>
 +
</network>
 +
</syntaxhighlight>
 +
Change to:
 +
<syntaxhighlight>
 +
<network>
 +
  <name>default</name>
 +
  <uuid>319d4ae5-4b6e-433c-832f-ad20269ed495</uuid>
 +
  <forward mode='nat'/>
 +
  <bridge name='virbr0' stp='on' delay='0' />
 +
  <mac address='52:54:00:09:89:76'/>
 +
  <ip address='192.168.122.1' netmask='255.255.255.0'>
 +
  </ip>
 +
</network>
 +
</syntaxhighlight>
  
−
2 Set up IML
+
And then restart libvirtd and dnsmasq:
−
 
+
<syntaxhighlight>
−
2.0.1 set up virtual env on CentOS
+
  service libvirtd restart
−
 
+
  service dnsmasq restart
−
follow this page:http://wiki.bostonlabs.co.uk/w/index.php?title=KVM:_Installation_and_operation
+
</syntaxhighlight>
−
 
+
restart the dhcpd
−
and disable dhcp on virt-manager on this page:http://wiki.bostonlabs.co.uk/w/index.php?title=KVM:_Tips_and_Tricks#Disable_DHCP_on_KVM_Server
+
<syntaxhighlight>
−
 
+
[root@iml-utv ieel-2.2.0.0]# service dhcpd restart
−
2.1 install and configure IML with the latest RPMs
+
start serverces:
 +
[root@iml-utv conf.d]# service named restart
 +
[root@iml-utv ieel-2.2.0.0]# service xinetd restart
 +
Starting xinetd:                                          [  OK  ]
 +
[root@iml-utv ieel-2.2.0.0]# service dhcpd restart
 +
[root@iml-utv ieel-2.2.0.0]# service httpd restart
 +
Starting httpd:  
 +
[root@iml-utv ieel-2.2.0.0]# service cobblerd restart
 +
Starting cobbler daemon:                                   [  OK  ]
 +
</syntaxhighlight>
 +
cobbler check
 +
<syntaxhighlight>
 +
[root@iml-utv ieel-2.2.0.0]# cobbler check
 +
[root@iml-utv conf.d]# cobbler sync
 +
</syntaxhighlight>
 +
Find ISOs:
 +
<syntaxhighlight>
 +
[root@iml-utv ~]# mount -o loop ./CentOS-6.6-x86_64-bin-DVD1.iso /mnt/
 +
[root@iml-utv ~]# cobbler import --name=CentOS_6.6_x86_64 --path=/mnt --breed=redhat --arch=x86_64
 +
[root@iml-utv ~]# cobbler sync
 +
</syntaxhighlight>
 +
add systems
 +
<syntaxhighlight>
 +
cobbler system add --name=mds1 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:52:10:EE --ip-address=172.105.0.11 --hostname=mds1.utv.boston.co.uk --netboot-enabled=Y --dns-name=mds1.utv.boston.co.uk --interface eth0
 +
cobbler system add --name=mds2 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:52:0E:6E --ip-address=172.105.0.12 --hostname=mds2.utv.boston.co.uk --netboot-enabled=Y --dns-name=mds2.utv.boston.co.uk --interface eth0
 +
cobbler system add --name=oss1 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:30:A8 --ip-address=172.105.0.21 --hostname=oss1.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss1.utv.boston.co.uk --interface eth0
 +
cobbler system add --name=oss2 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:4D:1A --ip-address=172.105.0.22 --hostname=oss2.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss2.utv.boston.co.uk --interface eth0
 +
cobbler system add --name=oss3 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:30:A4 --ip-address=172.105.0.23 --hostname=oss3.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss3.utv.boston.co.uk --interface eth0
 +
cobbler system add --name=oss4 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:4D:E4 --ip-address=172.105.0.24 --hostname=oss4.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss4.utv.boston.co.uk --interface eth0
 +
cobbler system add --name=mds1-ipmi --ip-address=172.105.1.11 --mac-address=0C:C4:7A:5A:8A:4A --hostname=mds1-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
 +
cobbler system add --name=mds2-ipmi --ip-address=172.105.1.12 --mac-address=0C:C4:7A:5A:8B:24 --hostname=mds2-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
 +
cobbler system add --name=oss1-ipmi --ip-address=172.105.1.21 --mac-address=0C:C4:7A:37:69:0C --hostname=oss1-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
 +
cobbler system add --name=oss2-ipmi --ip-address=172.105.1.22 --mac-address=0C:C4:7A:37:6F:AC --hostname=oss2-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
 +
cobbler system add --name=oss3-ipmi --ip-address=172.105.1.23 --mac-address=0C:C4:7A:37:69:0A --hostname=oss3-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
 +
cobbler system add --name=oss4-ipmi --ip-address=172.105.1.24 --mac-address=0C:C4:7A:37:6F:7C --hostname=oss4-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
 +
</syntaxhighlight>
 +
stop netboot
 +
<syntaxhighlight>
 +
cobbler system edit --name=mds2 --netboot-enabled=N
 +
</syntaxhighlight>
 
<syntaxhighlight>
 
<syntaxhighlight>
−
  32  cd /var/lib/chroma/repo/lustre
+
/etc/hosts:
−
  33  ls
+
172.105.0.1 head-utv
−
  34  rm -fr *
+
172.105.0.10 iml
−
  35  ls
+
172.105.0.11 mds1.utv.boston.co.uk mds1
−
  36  cp -r ~/artifacts/* .
+
172.105.0.12 mds2.utv.boston.co.uk mds2
−
  37  ls
+
172.105.0.21 oss1.utv.boston.co.uk oss1
−
  38  cd ..
+
172.105.0.22 oss2.utv.boston.co.uk oss2
−
  39  yum install createrepo
+
172.105.0.23 oss3.utv.boston.co.uk oss3
−
  40  ls
+
172.105.0.24 oss4.utv.boston.co.uk oss4
−
  41  create /var/lib/chroma/repo/lustre
 
−
  42  createrepo /var/lib/chroma/repo/lustre #create repo for luster servers
 
−
 
 
 
</syntaxhighlight>
 
</syntaxhighlight>
−
 
−
2.1.1 change the eht0 ip to 172.28.11.1
 
−
 
−
3 deploy all other nodes using cobbler
 
−
 
−
4 deploy IEEL on all other nodes
 

Revision as of 10:40, 15 July 2015

Preparation

Nodes

IML:

  1. CentOS 6.6
  2. Cobbler
    1. let kickstart file to only install system on first partition
  3. IML

MDS

  1. CentOS 6.6
  2. RAID:
    1. small partition for MGS
    2. large partition for MDT

OSS:

  1. CentOS 6.6
  2. RAID:
    1. 2 RAID arays: r6

Network

node ip mac formated mac
head 172.28.0.144
iml 172.105.0.10
mds1 172.105.0.11 0CC47A5210EE 0C:C4:7A:52:10:EE
mds2 172.105.0.12 0CC47A520E6E 0C:C4:7A:52:0E:6E
oss1 172.105.0.21 0CC47A6930A8 0C:C4:7A:69:30:A8
oss2 172.105.0.22 0CC47A694D1A 0C:C4:7A:69:4D:1A
oss3 172.105.0.23 0CC47A6930A4 0C:C4:7A:69:30:A4
oss4 172.105.0.24 0CC47A694DE4 0C:C4:7A:69:4D:E4
  1. Switch
    1. enable ETH license
  2. Cards
    1. first port IB, second port eth
  • IML
    • IP: 172.28.0.114

Hardware

  • Network
    • all IB card should be set to port1 -> IB, port2 -> ETH
    • some port on IB switch should be ETH
  • for every pair of JBOD, connect network cable directly to each other

Install Cobbler 

   17  yum install httpd dhcp bind
   18  yum install syslinux
   19  vim /etc/sysconfig/dhcpd
   20  history
[root@iml-utv ieel-2.2.0.0]# cat /etc/sysconfig/dhcpd
# Command line options here
DHCPDARGS=eth1
 install epel repo
## RHEL/CentOS 6 64-Bit ##
# wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -ivh epel-release-6-8.noarch.rpm

install cobbler 

yum install cobbler cobbler-web
for debian system deployment support 
   36  yum install debmirror 
   37  yum install pykickstart

set iptables and selinux for cobbler refer to here when using virt-manager, interfaces should be br0, br1 

[root@iml-utv ieel-2.2.0.0]# setenforce 0

setenforce: SELinux is disabled 

[root@iml-utv conf.d]# cat /etc/sysconfig/iptables
*nat
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [44:2156]
:OUTPUT ACCEPT [48:2352]
-A POSTROUTING -o eth0 -j MASQUERADE 
COMMIT
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [31985:2140861]
-A INPUT -s 172.105.0.0/16 -p udp -m udp --dport 69 -j ACCEPT 
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
-A INPUT -p icmp -j ACCEPT 
-A INPUT -i lo -j ACCEPT 
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 69 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT 
-A INPUT -p tcp -m tcp --dport 25151 -j ACCEPT 
-A INPUT -p udp -m state --state NEW -m udp --dport 69 -j ACCEPT 
-A FORWARD -i eth1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT 
-A FORWARD -i eth0 -o eth1 -j ACCEPT 
COMMIT

for tftp: 

[root@iml-utv conf.d]# cat /etc/sysconfig/iptables-config 
# Load additional iptables modules (nat helpers)
#   Default: -none-
# Space separated list of nat helpers (e.g. 'ip_nat_ftp ip_nat_irc'), which
# are loaded after the firewall rules are applied. Options for the helpers are
# stored in /etc/modprobe.conf.
IPTABLES_MODULES="ip_conntrack ip_conntrack_tftp"

xinetd: 

cat /etc/xinetd.d/rsync
# default: off
# description: The rsync server is a good addition to an ftp server, as it \
#	allows crc checksumming etc.
service rsync
{
	disable	= no
	flags		= IPv6
	socket_type     = stream
	wait            = no
	user            = root
	server          = /usr/bin/rsync
	server_args     = --daemon
	log_on_failure  += USERID
}

Edit /etc/debmirror.conf and comment dists and arches lines Edit /etc/cobbler/settings to be: 

# set to 1 to enable Cobbler's DHCP management features.
# the choice of DHCP management engine is in /etc/cobbler/modules.conf
manage_dhcp: 1

# set to 1 to enable Cobbler's DNS management features.
# the choice of DNS mangement engine is in /etc/cobbler/modules.conf
manage_dns: 1

next_server: 172.105.0.1
server: 172.105.0.1

pxe_just_once: 1  # to avoid reinstall looping
edit /etc/cobbler/dhcp.template:
cat /etc/cobbler/dhcp.template
subnet 172.105.0.0 netmask 255.255.0.0 {
     option routers             172.105.0.1;
     option domain-name-servers 172.105.0.1;
     option subnet-mask         255.255.0.0;
     range dynamic-bootp        172.105.0.100 172.105.0.200;
     default-lease-time         21600;
     max-lease-time             43200;
     next-server                $next_server;
     class "pxeclients" {
          match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
          if option pxe-system-type = 00:02 {
                  filename "ia64/elilo.efi";
          } else if option pxe-system-type = 00:06 {
                  filename "grub/grub-x86.efi";
          } else if option pxe-system-type = 00:07 {
                  filename "grub/grub-x86_64.efi";
          } else {
                  filename "pxelinux.0";
          }
     }

}

dhcpd.conf 

[root@iml-utv ieel-2.2.0.0]# cat /etc/dhcp/dhcpd.conf 
#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.sample
#   see 'man 5 dhcpd.conf'
#
#
subnet 172.105.0.0 netmask 255.255.0.0 {
     option routers             172.105.0.1;
     option domain-name-servers 172.105.0.1;
     option subnet-mask         255.255.0.0;
     range dynamic-bootp        172.105.0.100 172.105.0.200;
     default-lease-time         21600;
     max-lease-time             43200;
     next-server                172.105.0.1;
     filename 			"pxelinux.0";

}

disable dhcpd for virt-manager In this example i wanted to run a virtual DHCP server on the KVM system. The KVM server was getting in the way as it run a DHCP service also. To disable, remove the <dhcp> tags from the file /var/lib/libvirt/network/default.xml Change from: 

<network>
  <name>default</name>
  <uuid>319d4ae5-4b6e-433c-832f-ad20269ed495</uuid>
  <forward mode='nat'/>
  <bridge name='virbr0' stp='on' delay='0' />
  <mac address='52:54:00:09:89:76'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254' />
    </dhcp>
  </ip>
</network>

Change to: 

<network>
  <name>default</name>
  <uuid>319d4ae5-4b6e-433c-832f-ad20269ed495</uuid>
  <forward mode='nat'/>
  <bridge name='virbr0' stp='on' delay='0' />
  <mac address='52:54:00:09:89:76'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
  </ip>
</network>

And then restart libvirtd and dnsmasq: 

  service libvirtd restart
  service dnsmasq restart

restart the dhcpd 

[root@iml-utv ieel-2.2.0.0]# service dhcpd restart
start serverces:
[root@iml-utv conf.d]# service named restart
[root@iml-utv ieel-2.2.0.0]# service xinetd restart
Starting xinetd:                                           [  OK  ]
[root@iml-utv ieel-2.2.0.0]# service dhcpd restart
[root@iml-utv ieel-2.2.0.0]# service httpd restart
Starting httpd: 
[root@iml-utv ieel-2.2.0.0]# service cobblerd restart
Starting cobbler daemon:                                   [  OK  ]

cobbler check 

[root@iml-utv ieel-2.2.0.0]# cobbler check
[root@iml-utv conf.d]# cobbler sync

Find ISOs: 

[root@iml-utv ~]# mount -o loop ./CentOS-6.6-x86_64-bin-DVD1.iso /mnt/
[root@iml-utv ~]# cobbler import --name=CentOS_6.6_x86_64 --path=/mnt --breed=redhat --arch=x86_64
[root@iml-utv ~]# cobbler sync

add systems 

cobbler system add --name=mds1 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:52:10:EE --ip-address=172.105.0.11 --hostname=mds1.utv.boston.co.uk --netboot-enabled=Y --dns-name=mds1.utv.boston.co.uk --interface eth0
cobbler system add --name=mds2 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:52:0E:6E --ip-address=172.105.0.12 --hostname=mds2.utv.boston.co.uk --netboot-enabled=Y --dns-name=mds2.utv.boston.co.uk --interface eth0
cobbler system add --name=oss1 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:30:A8 --ip-address=172.105.0.21 --hostname=oss1.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss1.utv.boston.co.uk --interface eth0
cobbler system add --name=oss2 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:4D:1A --ip-address=172.105.0.22 --hostname=oss2.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss2.utv.boston.co.uk --interface eth0
cobbler system add --name=oss3 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:30:A4 --ip-address=172.105.0.23 --hostname=oss3.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss3.utv.boston.co.uk --interface eth0
cobbler system add --name=oss4 --profile=CentOS_6.6-x86_64 --mac=0C:C4:7A:69:4D:E4 --ip-address=172.105.0.24 --hostname=oss4.utv.boston.co.uk --netboot-enabled=Y --dns-name=oss4.utv.boston.co.uk --interface eth0
cobbler system add --name=mds1-ipmi --ip-address=172.105.1.11 --mac-address=0C:C4:7A:5A:8A:4A --hostname=mds1-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
cobbler system add --name=mds2-ipmi --ip-address=172.105.1.12 --mac-address=0C:C4:7A:5A:8B:24 --hostname=mds2-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
cobbler system add --name=oss1-ipmi --ip-address=172.105.1.21 --mac-address=0C:C4:7A:37:69:0C --hostname=oss1-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
cobbler system add --name=oss2-ipmi --ip-address=172.105.1.22 --mac-address=0C:C4:7A:37:6F:AC --hostname=oss2-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
cobbler system add --name=oss3-ipmi --ip-address=172.105.1.23 --mac-address=0C:C4:7A:37:69:0A --hostname=oss3-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64
cobbler system add --name=oss4-ipmi --ip-address=172.105.1.24 --mac-address=0C:C4:7A:37:6F:7C --hostname=oss4-ipmi --interface=eth0 --profile=CentOS_6.6-x86_64

stop netboot 

cobbler system edit --name=mds2 --netboot-enabled=N
/etc/hosts:
172.105.0.1	head-utv
172.105.0.10	iml
172.105.0.11	mds1.utv.boston.co.uk mds1
172.105.0.12	mds2.utv.boston.co.uk mds2
172.105.0.21	oss1.utv.boston.co.uk oss1
172.105.0.22	oss2.utv.boston.co.uk oss2
172.105.0.23	oss3.utv.boston.co.uk oss3
172.105.0.24	oss4.utv.boston.co.uk oss4
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