菜鸟玩云计算之十三：虚拟机迁移故障排除若干

 菜鸟玩云计算之十三：虚拟机迁移故障排除若干

今天把系统重装为Ubuntu 12.04.3LTS，然后把虚拟机迁移回来。出现若干错误。现把解决方法记录如下：

1）运行下面语句定义虚拟机：

$ sudo virsh define /etc/libvirt/qemu/vm1.xml

出现错误：

error: Failed to create domain from ubuntu.xml

error: unknown OS type hvm

解决方法：

把 root 添加到libvirtd和kvm组中。

sudo su
adduser `id -un` kvm
adduser `id -un` libvirtd

2）启动虚拟机出现错误：

$ sudo virsh start vm1

error: Failed to start domain vm1
error: Network not found: no network with matching name 'default'

解决方法:

$ virsh net-list --all

Name                 State      Autostart
-----------------------------------------

$ sudo virsh net-define /var/lib/libvirt/network/default.xml

Network default defined from /var/lib/libvirt/network/default.xml

$ sudo virsh net-autostart default

Network default marked as autostarted

$ sudo virsh net-start default

Network default started

$ brctl show

bridge name    bridge id        STP enabled    interfaces
br0        8000.f0def16d9385    no        eth0
virbr0        8000.5254009a780b    yes        virbr0-nic

$ virsh net-list --all

Name                 State      Autostart
-----------------------------------------
default              active     yes       

3）启动虚拟机报错:

$ sudo virsh start vm1

error: Failed to start domain vm1
error: internal error Process exited while reading console log output: Supported machines are:
pc         Standard PC (alias of pc-1.0)
pc-1.0     Standard PC (default)
pc-0.14    Standard PC
pc-0.13    Standard PC
pc-0.12    Standard PC
pc-0.11    Standard PC, qemu 0.11
pc-0.10    Standard PC, qemu 0.10
isapc      ISA-only PC

解决方法：

修改vm1.xml:

<domain type='kvm'>
  <name>vm-gitlab6</name>
  <uuid>6deea115-1bdf-03f3-974e-182c140411b5</uuid>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-1.0'>hvm</type>
    <!-- for ubuntu 13.04 and later
    <type arch='x86_64' machine='pc-i440fx-1.4'>hvm</type>
    -->
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <!-- for ubuntu 12.04.1 and before
    <emulator>/usr/bin/kvm</emulator>
    -->
    <emulator>/usr/bin/qemu-system-x86_64</emulator>
...... 

4）启动虚拟机报错:

$ sudo virsh start vm-ubuntu1204

error: Failed to start domain vm-ubuntu1204
error: Unable to read from monitor: Connection reset by peer

网上说：

$ sudo virsh managedsave-remove vm-ubuntu1204

仍然报错：

Domain vm-ubuntu1204 has no manage save image; removal skipped

机器CPU/内存不足，你需要更新硬件了。