KVM Node setup Basic steps only

To use LVM-based guests, you need a volume group that has some free space that is not allocated to any logical volume.

In this example, I use the volume group /dev/vg_server1 with a size of approx. 465GB...

vgdisplay

[root@server1 ~]# vgdisplay
  --- Volume group ---
  VG Name               vg_server1
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               465.28 GiB
  PE Size               4.00 MiB
  Total PE              119112
  Alloc PE / Size       26500 / 103.52 GiB
  Free  PE / Size       92612 / 361.77 GiB
 
 
  that contains the logical volumes /dev/vg_server1/LogVol00 with a size of approx. 100GB and /dev/vg_server1/LogVol01 (about 6GB) - the rest is not allocated and can be used for KVM guests:

lvdisplay

[root@server1 ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_server1/LogVol01
  LV Name                LogVol01
  VG Name                vg_server1
  LV UUID                uUpXY3-yGfZ-X6bc-3D1u-gB4E-CfKE-vDcNfw
  LV Write Access        read/write
  LV Creation host, time server1.example.com, 2012-08-21 13:45:32 +0200
  LV Status              available
  # open                 1
  LV Size                5.86 GiB
  Current LE             1500
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/vg_server1/LogVol00
  LV Name                LogVol00
  VG Name                vg_server1
  LV UUID                FN1404-Aczo-9dfA-CnNI-IKn0-L2hW-Aix0rV
  LV Write Access        read/write
  LV Creation host, time server1.example.com, 2012-08-21 13:45:33 +0200
  LV Status              available
  # open                 1
  LV Size                97.66 GiB
  Current LE             25000
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
 
 
 
  Or you can reinstall the OS and create a lvm partition as below
  =======
 
  df
====
/dev/md125              ext4      476M  150M  298M  34% /boot
/dev/mapper/lvroot-home ext4       85G  5.8G   75G   8% /home
/dev/md126              ext4       40G  3.3G   35G   9% /



Install required KVM RPMs/packages


# yum groupinstall "Virtualisation Tools" "Virtualization Platform"
# yum install python-virtinst


# chkconfig libvirtd on


# service libvirtd status
libvirtd (pid  31128) is running...
# virsh list

Setup will be like below




                    +-------------+
                     | CentOS/RHEL |             |-----|
     -->ISP router---+ Box Host w/ +--- eth0 -->-+ br0 +  Private IP
                     | KVM         |             |     |
                     +-------------+--- eth1 -->-+ br1 | Public IP
                                                 |-----|
                                                    |
                                                vm1-+---vm2----vm3---vm4
*** NOTE: each VMs will have two interface i.e. Private and Public *****

===================

Install and configure a network bridge
=============================================

 
KVM network setup
============
[root@vz2 template]# cat /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
BROADCAST=IP
IPADDR= Main IP
GATEWAY=IP
NETMASK=255.255.255.X
NETWORK=IP
ONBOOT=yes

=========

>> /etc/sysconfig/network-scripts/ifcfg-eno1


DEVICE=eno1
TYPE=Ethernet
HWADDR=check with hw
IPV6INIT=yes
IPV6_AUTOCONF=yes
ONBOOT=yes
BRIDGE=br0
==========================================================================

Next steps >> solusvm master /slave installation steps


Sreejith Anchal >> ping me @ s9400578382@gmail.com , if need.