add cpu,disk,net card to kvm guest

本文主要描述一下如何给虚拟机添加硬盘, CPU, 网卡.

1. 添加硬盘

创建硬盘文件

# qemu-img create -f qcow2 -o encryption=off,cluster_size=2M,preallocation=full /data03/kvmdisk/disk02.img 10G
Formatting '/data03/kvmdisk/disk02.img', fmt=qcow2 size=10737418240 encryption=off cluster_size=2097152 preallocation='full' 

[root@db-172-16-3-150 schemas]# virsh
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

编辑虚拟机配置

virsh # edit centos6_6_x64

在第一块硬盘配置下面添加, 注意文件名, 硬盘名称, 注意slot不要和其他所有项冲突

缓存自由配置. type可以选择raw或qcow2.  数据库建议使用raw格式.

    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='writethrough'/>
      <source file='/data03/kvmdisk/disk02.img'/>
      <target dev='vdb' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </disk>

xml全部如下 :

virsh # dumpxml centos6_6_x64
<domain type='kvm' id='6'>
  <name>centos6_6_x64</name>
  <uuid>4c613d4e-716b-f2cb-4df3-09bc7779f7df</uuid>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>
  <vcpu placement='static'>4</vcpu>
  <os>
    <type arch='x86_64' machine='rhel6.6.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
  </features>
  <cpu mode='host-model'>
    <model fallback='allow'/>
  </cpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='writethrough'/>
      <source file='/data03/kvmdisk/disk01.img'/>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='writethrough'/>
      <source file='/data03/kvmdisk/disk02.img'/>
      <target dev='vdb' bus='virtio'/>
      <alias name='virtio-disk1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </disk>
    <controller type='usb' index='0'>
      <alias name='usb0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:76:ac:2b'/>
      <source bridge='virbr0'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/3'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/3'>
      <source path='/dev/pts/3'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <memballoon model='virtio'>
      <alias name='balloon0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </memballoon>
  </devices>
</domain>

重启虚拟机 : 

virsh # shutdown centos6_6_x64
Domain centos6_6_x64 is being shutdown

virsh # start centos6_6_x64
Domain centos6_6_x64 started

连接到console进行验证是否已经添加硬盘 :

virsh # console centos6_6_x64

CentOS release 6.6 (Final)
Kernel 2.6.32-504.el6.x86_64 on an x86_64

digoal.sky-mobi.com login: root
Password:
Last login: Thu Apr  2 02:01:13 on ttyS0
[root@digoal ~]# fdisk -l

Disk /dev/vda: 34.4 GB, 34370224128 bytes
255 heads, 63 sectors/track, 4178 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0001bf14

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *           1        3698    29696000   83  Linux
/dev/vda2            3698        3959     2097152   82  Linux swap / Solaris

Disk /dev/vdb: 10.7 GB, 10747904000 bytes
16 heads, 63 sectors/track, 20825 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

2. # 修改CPU

直接修改xml并重启,

  <vcpu placement='static'>4</vcpu>

略.

3. # 添加网卡

直接修改xml并重启, 注意mac地址, slot不要冲突.

略 :

    <interface type='bridge'>
      <mac address='52:54:00:76:ac:2c'/>
      <source bridge='virbr0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </interface>

检验 : 

[root@digoal ~]# ethtool eth0
Settings for eth0:
        Link detected: yes
[root@digoal ~]# ethtool eth1
Settings for eth1:
        Link detected: no