UBuntu系统安装KVM创建虚拟机遭遇故障的解决方法
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>本次在UBuntu12.04.2系统安装KVM，随后创建虚拟机，又出现了新的问题。</p>
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<strong>现象：</strong></p>
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ping不通虚拟机，ssh登录不上，console方式登录不上, 虚拟机无法shutdown，貌似电源管理也没有安装成功。</p>
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<strong>先来解决网络问题：</strong></p>
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还好可以通过virt-cat来检查虚拟机内部的文件。</p>
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<strong>先关闭虚拟机</strong></p>
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virsh destroy vm1然后检查网卡设置文件：</p>
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</p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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<br>
root@dbkvm:~# virt-cat -d vm1 /etc/network/interfaces<br>
# This file describes the network interfaces available on your system<br>
# and how to activate them. For more information, see interfaces(5).<br>
# The loopback network interface<br>
auto lo<br>
iface lo inet loopback<br>
# The primary network interface<br>
auto eth0<br>
iface eth0 inet static<br>
address 192.168.1.51<br>
netmask 255.255.255.0<br>
network 192.168.1.0<br>
broadcast 192.168.1.255<br>
gateway 192.168.1.1<br>
# dns-* options are implemented by the resolvconf package, if installed<br>
dns-nameservers 8.8.8.8<br>
dns-search localdomain</div>
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这个dns-search localdomain看上去很奇怪。一般是defaultdomain。<br>
localdomain是因为host机器的/etc/hosts中配置成了：</p>
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</p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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127.0.0.1 localhost.localdomain dbkvm</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>将其换成这种配置：</span></p>
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</p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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127.0.0.1 localhost<br>
127.0.1.1 dbkvm</div>
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再创建虚拟机，网络正常了。可以ping通，可以ssh登录。 console问题还有。</p>
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虚拟机里面的网络设置dns-search 被设置成了defaultdomain。</p>
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因此推测是hosts文件的配置错误，导致虚拟机中网卡设置的dns-search错误，导致无法连接网络，因此不能在创建过程中从网络下载安装openssh-server.</p>
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来看一下电源管理</p>
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如果不安装电源管理，就不能在host主机通过shutdown关闭虚拟机。</p>
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在创建vm的选项中需要补上：<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
--addpkg=acpid</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>事后弥补就要登录到虚拟机中，然后运行命令：</span></p>
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<span><u>复制代码</u></span>
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代码如下:</p>
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apt-get install acpid</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>再来处理console不能登录的问题。</span></p>
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</p>
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先停止虚拟机。<br>
</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
virsh stop vm1</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>准备一个文件ttyS0.conf, 内容如下：</span></p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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# ttyS0.conf - getty<br>
# This service maintains a getty on ttyS0 from the point the system is<br>
# started until it is shut down again.<br>
start on stopped rc RUNLEVEL=<br>
stop on runlevel [!2345]<br>
respawn</div>
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安装guestfish程序：</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
apt-get install guestfish</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>现在用virt-copy-in将文件复制到vm的/etc/init目录中：</span></p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
virt-copy-in -d vm1 ttyS0.conf /etc/init</div>
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然后调用virsh edit vm1 来编辑vm1的配置文件，添加下面的内容：</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
<devices><br>
...<br>
<serial type='pty'><br>
<source path='/dev/pts/2'/><br>
<target port='0'/><br>
</serial><br>
<console type='pty' tty='/dev/pts/2'><br>
<source path='/dev/pts/2'/><br>
<target port='0'/><br>
</console><br>
</devices></div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>最后试用一下：</span></p>
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</p>
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<span><u>复制代码</u></span>
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<p>
代码如下:</p>
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<br>
virsh start vm1<br>
Domain vm1 started<br>
root@dbkvm:~/kvm_scripts# virsh console vm1<br>
Connected to domain vm1<br>
Escape character is ^]<br>
Ubuntu 12.04.2 LTS vm1 ttyS0<br>
vm1 login: root<br>
Password:<br>
Last login: Thu May 2 09:21:03 UTC 2013 from 192.168.1.4 on pts/1<br>
Welcome to Ubuntu 12.04.2 LTS (GNU/Linux 3.2.0-41-virtual x86_64)</div>
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可以了。所有问题的根源都出在那个不正确的host机器上的/etc/hosts配置。</p>
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