安装kvm虚拟机报错，解决办法

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创建虚拟磁盘文件
[iyunv@vmware2 ~]# qemu-img create -f qcow2 -o preallocation=metadata dev_beyond.img 8G
Formatting 'dev_beyond.img', fmt=qcow2 size=8589934592 encryption=off cluster_size=65536 preallocation='metadata'
参数说明： -o preallocation=metadata 预分配磁盘，磁盘空间不会立即占用
注意：ext3不支持此参数，ext4支持。
安装虚拟机命令参数
[iyunv@vmware2 ~]# virt-install --name=dev_beyond --ram 512 --vcpus=1 -f /root/dev_beyond.img --cdrom=/iso/Centos6.iso --graphics vnc,listen=0.0.0.0,port=7777, --force --autostart

Starting install...
ERROR    internal error Process exited while reading console log output: char device redirected to /dev/pts/1
qemu-kvm: -drive file=/root/dev_beyond.img,if=none,id=drive-ide0-0-0,format=raw,cache=none: could not open disk image /root/dev_beyond.img: Permission denied

Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///system start dev_beyond
otherwise, please restart your installation.

解决办法：把-o preallocation=metadata去掉即可。
[iyunv@vmware2 ~]# qemu-img create -f qcow2 /data/vmdisk/beyond.qcow2 8G      
Formatting '/data/vmdisk/beyond.qcow2', fmt=qcow2 size=8589934592 encryption=off cluster_size=65536
[iyunv@vmware2 ~]# virt-install --name=dev_beyond --ram 512 --vcpus=1 -f /data/vmdisk/beyond.qcow2 --cdrom=/iso/Centos6.iso --graphics vnc,listen=0.0.0.0,port=7777, --force --autostart                  

Starting install...
Creating domain...                                                                |    0 B     00:03     
Cannot open display:
Run 'virt-viewer --help' to see a full list of available command line options
Domain installation still in progress. You can reconnect to
the console to complete the installation process.