네오블로그

### controller 노드 ###

[root@localhost ~]# ssh 10.0.0.11
Last login: *** *** ** **:**:** 2016

[root@localhost ~]# hostnamectl set-hostname controller

[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1

TYPE=Ethernet
ONBOOT=yes
BOOTPROTO=none

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

[root@localhost ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

[root@localhost ~]# exit

logout
Connection to 10.0.0.11 closed.

### compute 노드 ###

[root@localhost ~]# ssh 10.0.0.31
Last login: *** *** ** **:**:** 2016
[root@localhost ~]# hostnamectl set-hostname compute

[root@localhost ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

[root@localhost ~]# exit

logout
Connection to 10.0.0.31 closed.

### block1 노드 ###

[root@localhost ~]# ssh 10.0.0.41
Last login: *** *** ** **:**:** 2016
[root@localhost ~]# hostnamectl set-hostname block1

[root@localhost ~]# exit

logout
Connection to 10.0.0.41 closed.

### object1 노드 ###

[root@localhost ~]# ssh 10.0.0.51
Last login: *** *** ** **:**:** 2016
[root@localhost ~]# hostnamectl set-hostname object1

[root@localhost ~]# exit

logout
Connection to 10.0.0.51 closed.

### object2 노드 ###

[root@localhost ~]# ssh 10.0.0.52
Last login: *** *** ** **:**:** 2016
[root@localhost ~]# hostnamectl set-hostname object2

[root@localhost ~]# sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

[root@localhost ~]# exit

logout
Connection to 10.0.0.51 closed.

[root@localhost ~]# vi /etc/hosts

### 아래의 내용 추가 후 저장###

10.0.0.11       controller
10.0.0.31       compute
10.0.0.41       block1
10.0.0.51       object1
10.0.0.52       object2

[root@localhost ~]# scp /etc/hosts controller:/etc/hosts
The authenticity of host 'controller (10.0.0.11)' can't be established.
ECDSA key fingerprint is **:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:.

Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'controller' (ECDSA) to the list of known hosts.
hosts                                         100%  252     0.3KB/s   00:00
[root@localhost ~]# scp /etc/hosts compute:/etc/hosts
The authenticity of host 'compute (10.0.0.31)' can't be established.
ECDSA key fingerprint is **:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:.

Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'compute,10.0.0.31' (ECDSA) to the list of known hosts.
hosts                                         100%  252     0.3KB/s   00:00
[root@localhost ~]# scp /etc/hosts block1:/etc/hosts
The authenticity of host 'block1 (10.0.0.41)' can't be established.
ECDSA key fingerprint is **:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'block1,10.0.0.41' (ECDSA) to the list of known hosts.
hosts                                         100%  252     0.3KB/s   00:00
[root@localhost ~]# scp /etc/hosts object1:/etc/hosts
The authenticity of host 'object1 (10.0.0.51)' can't be established.
ECDSA key fingerprint is **:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:.

Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'object1,10.0.0.51' (ECDSA) to the list of known hosts.
hosts                                         100%  252     0.3KB/s   00:00
[root@localhost ~]# scp /etc/hosts object2:/etc/hosts
The authenticity of host 'object2 (10.0.0.52)' can't be established.
ECDSA key fingerprint is **:**:**:**:**:**:**:**:**:**:**:**:**:**:**:**:.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'object2,10.0.0.52' (ECDSA) to the list of known hosts.
hosts                                         100%  252     0.3KB/s   00:00

...(중략)...

Installed:
  chrony.x86_64 0:2.1.1-1.el7.centos

Complete!
[root@controller ~]# vi /etc/chrony.conf

### 아래의 내용처럼 추가 ###

server 10.0.0.1 iburst              # 외부 NTP 서버의 IP를 설정, 기존의 "server 1.centos.pool.ntp.org iburst"등은 주석 처리 또는 삭제

allow 10.0.0.0/24                   # 다른 노드들이 접근을 허용할수 있게 해당 내용 추가

### 서비스 등록 및 활성화 ###

[root@controller ~]# systemctl enable chronyd.service
[root@controller ~]# systemctl start chronyd.service

### sync가 잘되었는지 확인 ###

[root@controller ~]# chronyc sources                 
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^? 10.0.0.1                      0   8     0   10y     +0ns[   +0ns] +/-    0ns

...(중략)...

Installed:
  chrony.x86_64 0:2.1.1-1.el7.centos

Complete!
 [root@compute ~]# vi /etc/chrony.conf

### 아래의 내용처럼 추가 ###

server controller iburst           # controller 노드의 시간과 sync 시킨다. 기존의 "server 1.centos.pool.ntp.org iburst"등은 주석 처리 또는 삭제

### 서비스 등록 및 활성화 ###

[root@compute ~]# systemctl enable chronyd.service
[root@compute ~]# systemctl start chronyd.service

### sync가 잘되었는지 확인 ###

[root@compute ~]# chronyc sources
210 Number of sources = 1
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^? controller                    0   8     0   10y     +0ns[   +0ns] +/-    0ns 

[root@python ~]# vi /etc/inittab
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
#   0 - halt (Do NOT set initdefault to this)
#   1 - Single user mode
#   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
#   3 - Full multiuser mode
#   4 - unused
#   5 - X11
#   6 - reboot (Do NOT set initdefault to this)
#
id:5:initdefault:
~
~

[root@localhost etc]# cat inittab
# inittab is no longer used when using systemd.
#
# ADDING CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# Ctrl-Alt-Delete is handled by /usr/lib/systemd/system/ctrl-alt-del.target
#
# systemd uses 'targets' instead of runlevels. By default, there are two main targets:
#
# multi-user.target: analogous to runlevel 3
# graphical.target: analogous to runlevel 5
#
# To view current default target, run:
# systemctl get-default
#
# To set a default target, run:
# systemctl set-default TARGET.target
#

[root@localhost home]# wget http://ftp.daumkakao.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1511.iso
--2016-01-29 23:47:34--  http://ftp.daumkakao.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1511.iso
Resolving ftp.daumkakao.com (ftp.daumkakao.com)... 103.246.57.108
Connecting to ftp.daumkakao.com (ftp.daumkakao.com)|103.246.57.108|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 4329570304 (4.0G) [application/x-iso9660-image]
Saving to: ‘CentOS-7-x86_64-DVD-1511.iso’

94% [====================================================================================================================>        ] 4,073,544,588 9.65MB/s   in 15m 0s

2016-01-30 00:02:39 (4.32 MB/s) - Connection closed at byte 4073544588. Retrying.

--2016-01-30 00:02:40--  (try: 2)  http://ftp.daumkakao.com/centos/7/isos/x86_64/CentOS-7-x86_64-DVD-1511.iso
Connecting to ftp.daumkakao.com (ftp.daumkakao.com)|103.246.57.108|:80... connected.
HTTP request sent, awaiting response... 206 Partial Content
Length: 4329570304 (4.0G), 256025716 (244M) remaining [application/x-iso9660-image]
Saving to: ‘CentOS-7-x86_64-DVD-1511.iso’

100%[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=======>] 4,329,570,304 5.29MB/s   in 33s

2016-01-30 00:03:13 (7.31 MB/s) - ‘CentOS-7-x86_64-DVD-1511.iso’ saved [4329570304/4329570304]
[root@localhost home]#

[root@localhost networks]# vi managenetwork.xml

<network>
  <name>managenetwork</name>
  <forward dev='br0' mode='nat'>         
    <interface dev='br0'/>                        // 인터넷에 연결된 brige 인터페이스를 입력                         
  </forward>
  <bridge name='virbr1' stp='on' delay='0'/>      // virbr0이 없으면 0으로 생성해도 무방
  <domain name='managenetwork'/>
  <ip address='10.0.0.1' netmask='255.255.255.0'>

  </ip>
</network>

[root@localhost networks]# virsh net-define /etc/libvirt/qemu/networks/managenetwork.xml
Network managenetwork defined from /etc/libvirt/qemu/networks/managenetwork.xml

[root@localhost networks]#

[root@localhost networks]# virsh net-list --all
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 managenetwork        inactive   no            yes
 storagenetwork       active     yes           yes

[root@localhost networks]# virsh net-start managenetwork
Network managenetwork started

[root@localhost networks]# virsh net-autostart managenetwork
Network managenetwork marked as autostarted

[root@localhost networks]# virsh net-list --all
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 managenetwork        active     yes           yes
 storagenetwork       active     yes           yes

[root@localhost networks]#

[root@localhost~]# virsh dumpxml centos7.0 | grep 'mac address'
      <mac address='52:54:00:4a:8d:f2'/>   // managenetwork NAT 네트워크에 연결된 eth0
      <mac address='52:54:00:67:ff:88'/>    // host의 br0에 연결된 eth1

[root@localhost ~]# virsh net-edit managenetwork

...

중략

...

    <dhcp>
      <range start='10.0.0.2' end='10.0.0.254'/>
      <host mac='52:54:00:4a:8d:f2' ip='10.0.0.5'/>

      <host mac='52:54:00:4a:8d:11' ip='10.0.0.11'/>     // 가상머신 생성시 정해진 mac IP로 변경하여 DHCP로 IP 할당
      <host mac='52:54:00:4a:8d:31' ip='10.0.0.31'/>
      <host mac='52:54:00:4a:8d:41' ip='10.0.0.41'/>
      <host mac='52:54:00:4a:8d:51' ip='10.0.0.51'/>
      <host mac='52:54:00:4a:8d:52' ip='10.0.0.52'/>

    </dhcp>

[root@localhost ~]# virsh shutdown centos7.0
Domain centos7.0 is being shutdown

[root@localhost ~]# virsh net-destroy managenetwork
Network managenetwork destroyed

[root@localhost ~]# virsh net-start managenetwork
Network managenetwork started

[root@localhost ~]# virsh start centos7.0
Domain centos7.0 started

[root@localhost ~]# virsh domifaddr centos7.0
 Name       MAC address          Protocol     Address
-------------------------------------------------------------------------------
 vnet0      52:54:00:4a:8d:f2    ipv4         10.0.0.5/24

[root@localhost ~]#

[root@localhost ~]# yum -y update

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: ftp.kaist.ac.kr
 * extras: ftp.kaist.ac.kr
 * updates: ftp.kaist.ac.kr
...

중략

...

[root@localhost ~]#

[root@localhost ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx root@localhost.managenetwork
The key's randomart image is:
+--[ RSA 2048]----+
|        .. .  .o.|
|         .o   +o+|
|          ..  .Bo|
|         ..  .+oo|
|        S  ..  .+|
|            .. oE|
|           .  +  |
|          . .. . |
|           . .o..|
+-----------------+
[root@localhost ~]# cd .ssh

[root@localhost ~]# cp id_rsa.pub authorized_keys

[root@localhost ~]# shutdown -h now

[root@localhost ~]# virsh domblklist centos7.0
Target     Source
------------------------------------------------
vda        /mnt/osvg/vol/ospool/linux.qcow2

[root@localhost ~]# cd /mnt/osvg/vol/ospool

[root@localhost ospool]# qemu-img create -b ./linux.qcow2 -f qcow2 ./controller.qcow2
Formatting './controller.qcow2', fmt=qcow2 size=107374182400 backing_file='./linuxbase.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
[root@localhost ospool]# qemu-img create -b ./linux.qcow2 -f qcow2 ./compute.qcow2
Formatting './compute.qcow2', fmt=qcow2 size=107374182400 backing_file='./linuxbase.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
[root@localhost ospool]# qemu-img create -b ./linux.qcow2 -f qcow2 ./block1.qcow2
Formatting './block1.qcow2', fmt=qcow2 size=107374182400 backing_file='./linuxbase.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
[root@localhost ospool]# qemu-img create -b ./linux.qcow2 -f qcow2 ./object1.qcow2
Formatting './object1.qcow2', fmt=qcow2 size=107374182400 backing_file='./linuxbase.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
[root@localhost ospool]# qemu-img create -b ./linux.qcow2 -f qcow2 ./object2.qcow2
Formatting './object2.qcow2', fmt=qcow2 size=107374182400 backing_file='./linuxbase.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16

[root@localhost ospool]# chown qemu:qemu *.qcow2
[root@localhost ospool]# ls -alrt
total xxxxxxx

drwxr-xr-x 4 nfsnobody root         4096 Jan 23 20:16 ..
-rw-r--r-- 1 qemu      qemu   3673030656 Jan 25 07:30 xxxxx.qcow2
-rw-r--r-- 1 qemu      qemu   4676124672 Jan 25 07:30 xxxxx.qcow2
-rw-r--r-- 1 qemu      qemu   3686268928 Jan 28 10:21 xxxxx.qcow2
-rw-r--r-- 1 qemu      qemu   1436483584 Jan 30 14:57 linux.qcow2
-rw-r--r-- 1 qemu      qemu 107390894592 Feb  1 05:19 xxxxx.qcow2
-rw-r--r-- 1 qemu      qemu   4346937344 Feb 10 05:44 xxxxx.qcow2
-rw-r--r-- 1 qemu      qemu   4289134592 Feb 16 09:27 xxxxx.qcow2
-rw-r--r-- 1 qemu      qemu       198656 Feb 17 05:37 controller.qcow2
-rw-r--r-- 1 qemu      qemu       198656 Feb 17 05:37 compute.qcow2
-rw-r--r-- 1 qemu      qemu       198656 Feb 17 05:37 block1.qcow2
-rw-r--r-- 1 qemu      qemu       198656 Feb 17 05:37 object1.qcow2
drwxr-xr-x 2 root      root         4096 Feb 17 05:38 .
-rw-r--r-- 1 qemu      qemu       198656 Feb 17 05:38 object2.qcow2

[root@localhost qemu]# virsh dumpxml generic >> /etc/libvirt/qemu/dump.xml

[root@localhost qemu]# cp /etc/libvirt/qemu/dump.xml /etc/libvirt/qemu/controller.xml
[root@localhost qemu]# cp /etc/libvirt/qemu/dump.xml /etc/libvirt/qemu/compute.xml
[root@localhost qemu]# cp /etc/libvirt/qemu/dump.xml /etc/libvirt/qemu/block1.xml
[root@localhost qemu]# cp /etc/libvirt/qemu/dump.xml /etc/libvirt/qemu/object1.xml
[root@localhost qemu]# cp /etc/libvirt/qemu/dump.xml /etc/libvirt/qemu/object2.xml

[root@localhost qemu]# vim /etc/libvirt/qemu/controller.xml

<domain type='kvm'>
  <name>controller</name>                            // 이름 수정

  <uuid>5e26e120-f046-4c8a-bf56-dbd4b9ba8f3f</uuid>  // 해당 내용은 실제 설정시는 uuid가 겹치면 안되기 때문에 삭제(define 할경우때 자동으로 생성)
  <memory unit='GiB'>4</memory>                      // 메모리도 알아서 수정, 단위를 GiB로 수정후 변경하는게 편함
  <currentMemory unit='GiB'>4</currentMemory>        // 현재 설정에서는 controller 4G, comupte 8G, block1 2G, object 각 4G 할당 예정
  <vcpu placement='static'>2</vcpu>                  // cpu는 각각 2, 6, 2, 2, 2 할당 예정
  ...(생략)...

  <cpu mode='host-passthrough'>                      // 중첩 가상화를 위해 cpu mode를 host-passthrough 또는 host-model로 변경
  ...(생략)...
   <disk type='file' device='disk'>
     <driver name='qemu' type='qcow2'/>
     <source file='/mnt/osvg/vol/ospool/controller.qcow2'/>   // 기존에 생성한 disk img
     <target dev='vda' bus='virtio'/>
     <boot order='1'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
   </disk>

...생략...

   <interface type='network'>                          // eth0에 해당 
     <mac address='52:54:00:4a:8d:11'/>                // 위의 management network에서 dhcp로 ip를 할당한 macaddress 설정
     <source network='managenetwork'/>
     <model type='virtio'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
   </interface>
   <interface type='bridge'>                           // eth1에 해당, block1, object1, object2 노드는 해당 디바이스 삭제
     <mac address='52:54:00:a6:f8:42'/>                // mac address가 겹치면 안되기 때문에 알아서 수정하거나 삭제해도 무방      
     <source bridge='br0'/>
     <model type='virtio'/>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>

   </interface>

[root@localhost qemu]# virsh define /etc/libvirt/qemu/controller.xml
Domain controller defined from /etc/libvirt/qemu/controller.xml

[root@localhost qemu]# virsh define /etc/libvirt/qemu/compute.xml
Domain compute defined from /etc/libvirt/qemu/compute.xml

[root@localhost qemu]# virsh define /etc/libvirt/qemu/block1.xml
Domain block1 defined from /etc/libvirt/qemu/block1.xml

[root@localhost qemu]# virsh define /etc/libvirt/qemu/object1.xml
Domain object1 defined from /etc/libvirt/qemu/object1.xml

[root@localhost qemu]# virsh define /etc/libvirt/qemu/object2.xml
Domain object2 defined from /etc/libvirt/qemu/object2.xml

[root@localhost qemu]# virsh list --all
 Id    Name                           State
----------------------------------------------------

 -     centos7.0                        shut off

 -     compute                        shut off
 -     controller                     shut off
 -     juho                           shut off
 -     object1                        shut off
 -     object2                        shut off

[root@localhost qemu]# virsh start controller
Domain controller started

[root@localhost qemu]# virsh start compute
Domain compute started

[root@localhost qemu]# virsh start block1
Domain block1 started

[root@localhost qemu]# virsh start object1
Domain object1 started

[root@localhost qemu]# virsh start object2
Domain object2 started

[root@localhost qemu]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 4     controller                     running
 5     compute                        running
 6     block1                         running
 7     object1                        running
 8     object2                        running

 -     centos7.0                        shut off

[root@localhost qemu]# ping 10.0.0.11
PING 10.0.0.11 (10.0.0.11) 56(84) bytes of data.
64 bytes from 10.0.0.11: icmp_seq=1 ttl=64 time=0.193 ms
64 bytes from 10.0.0.11: icmp_seq=2 ttl=64 time=0.168 ms
^C
--- 10.0.0.11 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.168/0.180/0.193/0.018 ms
[root@localhost ospool]# ping 10.0.0.31
PING 10.0.0.31 (10.0.0.31) 56(84) bytes of data.
64 bytes from 10.0.0.31: icmp_seq=1 ttl=64 time=0.185 ms
^C
--- 10.0.0.31 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.185/0.185/0.185/0.000 ms
[root@localhost ospool]# ping 10.0.0.41
PING 10.0.0.41 (10.0.0.41) 56(84) bytes of data.
64 bytes from 10.0.0.41: icmp_seq=1 ttl=64 time=0.164 ms
^C
--- 10.0.0.41 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.164/0.164/0.164/0.000 ms
[root@localhost ospool]# ping 10.0.0.51
PING 10.0.0.51 (10.0.0.51) 56(84) bytes of data.
64 bytes from 10.0.0.51: icmp_seq=1 ttl=64 time=0.176 ms
^C
--- 10.0.0.51 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.176/0.176/0.176/0.000 ms
[root@localhost ospool]# ping 10.0.0.52
PING 10.0.0.52 (10.0.0.52) 56(84) bytes of data.
64 bytes from 10.0.0.52: icmp_seq=1 ttl=64 time=0.177 ms
64 bytes from 10.0.0.52: icmp_seq=2 ttl=64 time=0.183 ms
^C
--- 10.0.0.52 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.177/0.180/0.183/0.003 ms

[root@localhost /]# ifconfig -a
eth2      Link encap:Ethernet  HWaddr 52:54:00:21:E9:C3
          inet addr:192.168.10.108  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::5054:ff:fe21:e9c3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:11724 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2465 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1016787 (992.9 KiB)  TX bytes:437308 (427.0 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

# PCI device 0x8086:0x100e (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:a6:f8:42", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x8086:0x100e (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:5b:a3:8c", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

# PCI device 0x8086:0x100e (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:21:e9:c3", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2" 

[root@localhost /]# rm /etc/udev/rules.d/70-persistent-net.rules
rm: remove regular file `/etc/udev/rules.d/70-persistent-net.rules'? y
[root@localhost /]# ls /etc/udev/rules.d/
60-fprint-autosuspend.rules  60-pcmcia.rules  60-raw.rules  70-persistent-cd.rules  90-alsa.rules  90-hal.rules  98-kexec.rules

[root@localhost /]# mv /etc/sysconfig/network-scripts/ifcfg-eth2 /etc/sysconfig/network-scripts/ifcfg-eth0

[root@localhost /]# vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth2    // eth0으로 변경
#HWADDR=52:54:00:A6:F8:42
TYPE=Ethernet
#UUID=803a97dd-c983-439e-8d0f-21f85f309062
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp

[root@localhost /]# reboot

[root@localhost /]# ls /etc/udev/rules.d/
60-fprint-autosuspend.rules  60-pcmcia.rules  60-raw.rules  70-persistent-cd.rules  70-persistent-net.rules  90-alsa.rules  90-hal.rules  98-kexec.rules 

// 재부팅 후 70-persistent-net.rules 생성

[root@localhost /]# cat /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# PCI device 0x8086:0x100e (e1000)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="52:54:00:21:e9:c3", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"