virsh 命令：
virsh list # 列出所有运行的虚拟机
virsh list --all # 列出所有虚拟机
virsh hostname # 列出真机主机名
virsh sysinfo # 列出真机的详细信息
virsh nodecpustats # 得到真机cpu状态
virsh nodememstats # 得到真机内存状态
virsh node-memory-tune # 允许你设置的node内存参数
virsh capabilities # 打印虚拟机的特点
virsh freecell # 打印虚拟机中可用内存
virsh shutdown dns # 关闭虚拟机dns
virsh start dns # 启动虚拟机dns
virsh dumpxml dns > # 导出dns虚拟机的配置文件
nodeinfo: 得到电脑详细配置名字
nodecpustats: 真机cpu 的状态
nodemenstats: 真机内存的详细信息
node-memory-tune: 允许你设置node的内存参数
capablilities: 打印虚拟机的特点
freecell: 打印出虚拟I机中可用的内存
virsh --help #查看命令帮忙
virsh list #显示正在运行的虚拟机
virsh list --all #显示所有的虚拟机
virsh start vm-node1 #启动vm-node1虚拟机
virsh shutdown vm-node1 #关闭vm-node1虚拟机
virsh destroy vm-node1 #虚拟机vm-node1强制断电
virsh suspend vm-node1 #挂起vm-node1虚拟机
virsh resume vm-node1 #恢复挂起的虚拟机
virsh undefine vm-node1 #删除虚拟机，慎用
virsh dominfo vm-node1 #查看虚拟机的配置信息
virsh domiflist #查看网卡配置信息
virsh domblklist vm-node1 #查看该虚拟机的磁盘位置
virsh edit vm-node1 #修改vm-node1的xml配置文件
virsh dumpxml vm-node1 #查看KVM虚拟机当前配置
virsh dumpxml vm-node1 > #备份vm-node1虚拟机的xml文件，原文件默认路径/etc/libvirt/qemu/
virsh autostart vm-node1 #KVM物理机开机自启动虚拟机，配置后会在此目录生成配置文件/etc/libvirt/qemu/autostart/
virsh autostart --disable vm-node1 #取消开机自启动
virsh console vm-node1 #进入虚拟机
<domain type='kvm' id='13'>
<name>demo-guest1</name>
<uuid>409fc837-ef54-48c9-9a47-c62fe383d33d</uuid>
<!-- guset可以使用的最大内存，以KB为单位 -->
<memory unit='KiB'>2097152</memory>
<!-- guest启动时内存，可以通过virsh setmem来调整内存，但不能大于最大可使用内存 -->
<currentMemory unit='KiB'>2097152</currentMemory>
<!-- 分配的虚拟cpu -->
<vcpu placement='static'>2</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
<boot dev='hd'/>
</os>
<features>
<acpi/>
<apic/>
<!-- 处理器特性 -->
</features>
<cpu mode='custom' match='exact' check='full'>
<model fallback='forbid'>Skylake-Server-IBRS</model>
<feature policy='require' name='md-clear'/>
<feature policy='require' name='spec-ctrl'/>
<feature policy='require' name='ssbd'/>
<feature policy='require' name='hypervisor'/>
<feature policy='disable' name='arat'/>
</cpu>
<!-- 时钟, 使用本地时间: utc -->
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<!-- 定义了在kvm环境中crash时的默认的动作分别为destroy和restart。
destroy：停止该虚拟机。相当于关闭电源。
restart: 重启虚拟机 -->
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<!-- 设备定义开始 -->
<devices>
<!-- 模拟器，此处路径为qemu-kvm绝对路径 -->
<emulator>/usr/libexec/qemu-kvm</emulator>
<!-- 用于kvm启动或者存储的文件,启动设备为：/image/UCarApp1/UCarApp1_clone -->
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/image/UCarApp1/UCarApp1_clone'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<!-- 可通过--disk 修改磁盘总线类型为ide --disk UCarApp1_clone,bus=ide -->
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<alias name='usb'/>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<alias name='usb'/>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<alias name='usb'/>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='virtio-serial' index='0'>
<alias name='virtio-serial0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</controller>
<!-- 采用普通的驱动，即硬盘和网卡都采用默认配置情况下，网卡工作在 模拟的rtl 8139 网卡下，速度为100M 全双工。采用 virtio 驱动后，网卡工作在 1000M 的模式下 -->
<interface type='bridge'>
<mac address='52:54:00:bc:1b:74'/>
<source bridge='br0'/>
<target dev='vnet6'/>
<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/11'/>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/11'>
<source path='/dev/pts/11'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-13-demo-guest1/.guest_agent.0'/>
<target type='virtio' name='.guest_agent.0' state='disconnected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<!-- 输入设备 -->
<input type='tablet' bus='usb'>
<alias name='input0'/>
<address type='usb' bus='0' port='1'/>
</input>
<!-- 输入设备 -->
<input type='mouse' bus='ps2'>
<alias name='input1'/>
</input>
<input type='keyboard' bus='ps2'>
<alias name='input2'/>
</input>
<!-- 定义与guset交互的图形设备。在这个例子中，使用vnc协议。listen的地址为0.0.0.0的地址。prot为5903,通过以下的命令查找端口号: virsh vncdisplay guestName -->
<graphics type='vnc' port='5903' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</memballoon>
<rng model='virtio'>
<backend model='random'>/dev/urandom</backend>
<alias name='rng0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</rng>
<!-- 设备定义结束 -->
</devices>
<seclabel type='dynamic' model='selinux' relabel='yes'>
<label>system_u:system_r:svirt_t:s0:c47,c808</label>
<imagelabel>system_u:object_r:svirt_image_t:s0:c47,c808</imagelabel>
</seclabel>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+107:+107</label>
<imagelabel>+107:+107</imagelabel>
</seclabel>
</domain>
