kvm qemu创建虚拟机

1. 安装虚拟化服务

yum -y install qemu-kvm qemu-system libvirt virt-manager

2. 配置网络桥接

2.1 修改配置文件：/etc/sysconfig/network-scripts/ifcfg-br0

DEVICE=br0
ONBOOT=yes
TYPE=Bridge
IPADDR=10.18.254.234
NETMASK=255.255.254.0
GATEWAY=10.18.254.254
BOOTPROTO=static
NAME=br0

2.2 修改配置文件：/etc/sysconfig/network-scripts/ifcfg-eno1

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=eno1
UUID=5dbb88d7-9d31-4696-821c-ab227991d7f1
DEVICE=eno1
ONBOOT=yes
BRIDGE=br0

3. 编写xml配置文件创建虚拟机

domain type='kvm'>
<name>centos2</name>
<memory>1048576</memory>
<currentMemory>1048576</currentMemory>
<vcpu>2</vcpu>

<os>
    <type arch='x86_64' machine='pc'>hvm</type>
    <boot dev='cdrom'/>
</os>

<features>
    <acpi/>
    <apic/>
    <pae/>
</features>

<clock offset='localtime'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>

<devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>

      <disk type='file' device='cdrom'>
      <source file='/root/shiyawei/CentOS-7-x86_64-Minimal-1810.iso'/>
      <target dev='hdb' bus='ide'/>
      </disk>　

     <disk type='file' device='disk'>
     <driver name='qemu' type='qcow2'/>
     <source file='/root/shiyawei/test2.qcow2'/>
     <target dev='sda' bus='scsi'/>
     </disk>

    <interface type='bridge'>
        <source bridge='br0'/>
        <mac address="6c:92:bf:4d:e2:aa"/>
    </interface>

    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0' keymap='en-us'/>
</devices>
</domain>

4. 运行虚拟机文件并启动

virsh define centos_config2.xml
virsh start centos

5. 查看虚拟机是否创建成功

virsh list --all
ps -ef|grep centos

 6. 安装好操作系统后，更改xml文件中的 <boot dev='hd'> 将系统另外一块盘开启，这样避免反复重装系统