课程第9次：2020-02-28星期五

botang

1. KVM虚拟机的配置文件路径/etc/libvirt/qemu/*.xml:

1. etworks  rhel7.6.xml  win10.xml

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1. <devices>
   
2.     <emulator>/usr/libexec/qemu-kvm</emulator>
   
3.     <disk type='block' device='disk'>
   
4.       <driver name='qemu' type='raw' cache='none' io='native'/>
   
5.       <source dev='/dev/sdc1'/>
   
6.       <target dev='vda' bus='virtio'/>
   
7.       <boot order='1'/>
   
8.       <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
   
9.     </disk>
   
10.     <controller type='usb' index='0' model='qemu-xhci' ports='15'>
    

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备份虚拟机的配置（元数据meta），只要上面的xml文件，恢复时拷贝到此处（systemctl restart libvirtd）
备份虚拟机的盘数据（data），考贝dd if=/dev/sdc of=...file  bs=4M   , 恢复dd of=/dev/sdc if=...file

2. KVM虚拟机所在的主机如果重启，它们的运行内存会被保存
/var/lib/libvirt/qemu/save

3. 解释/etc/auto.master:

1. /net    -hosts
   
2. #
   
3. # Include /etc/auto.master.d/*.autofs
   
4. # The included files must conform to the format of this file.
   
5. #
   
6. +dir:/etc/auto.master.d
   

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4. systemctl reload nfs-server == exportfs -r