qemu guest machine management through virsh_domain type qemu-优快云博客

本文详细介绍了使用Libvirt服务和QEMU指令进行虚拟机管理的过程，包括Libvirt服务的状态检查、QEMU命令行参数到XML配置的转换方法。通过具体的实例，展示了如何在Linux环境下设置和运行虚拟机，为读者提供了深入理解虚拟化技术的实践指导。

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1. libvirtd service

lake@lake-Latitude-5491:~/qemu$ ps -ef |grep -i libvir
root 958 1 0 Mar12 ? 00:00:00 /usr/sbin/libvirtd
libvirt+ 1411 1 0 Mar12 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
root 1412 1411 0 Mar12 ? 00:00:00 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
lake 10950 5717 0 21:11 pts/1 00:00:00 grep --color=auto -i libvir
lake@lake-Latitude-5491:~/qemu$ netstat -an -p |grep libvir
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
unix 2 [ ACC ] STREAM LISTENING 28968 - /var/run/libvirt/virtlockd-sock
unix 2 [ ACC ] STREAM LISTENING 32538 - /var/run/libvirt/libvirt-sock
unix 2 [ ACC ] STREAM LISTENING 32539 - /var/run/libvirt/libvirt-sock-ro
unix 2 [ ACC ] STREAM LISTENING 32540 - /var/run/libvirt/libvirt-admin-sock
unix 2 [ ACC ] STREAM LISTENING 28957 - /var/run/libvirt/virtlogd-sock
..................

lake@lake-Latitude-5491:~$ service libvirt-bin status
● libvirtd.service - Virtualization daemon
Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled; vendor preset:
Active: active (running) since Fri 2019-03-15 14:51:26 CST; 2min 5s ago
Docs: man:libvirtd(8)
https://libvirt.org
Main PID: 933 (libvirtd)
Tasks: 19 (limit: 32768)
CGroup: /system.slice/libvirtd.service
├─ 933 /usr/sbin/libvirtd
├─1302 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default
└─1303 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default

2. qemu command line to XML

lake@lake-Latitude-5491:~/qemu$ cat qemu.args
LC_ALL=C PATH=/usr/bin:/bin HOME=/home/lake USER=lake LOGNAME=lake /usr/bin/qemu-system-i386 -S -M pc -smp 1 -m 4096M -nographic -monitor pty -no-acpi -hda /home/lake/qemu/disk.img -netdev tap,id=tapnet,ifname=tap1,script=no -device rtl8139,netdev=tapnet -no-acpi
lake@lake-Latitude-5491:~/qemu$
lake@lake-Latitude-5491:~/qemu$
lake@lake-Latitude-5491:~/qemu$ virsh domxml-from-native qemu-argv qemu.args
<domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>unnamed</name>
<uuid>aa8cc963-5d08-4416-bc62-f0698bd450fe</uuid>
<memory unit='KiB'>4194304</memory>
<currentMemory unit='KiB'>4194304</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type machine='pc-i440fx-2.11'>hvm</type>
</os>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-i386</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/home/lake/qemu/disk.img'/>
<target dev='hda' bus='ide'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='piix3-uhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<memballoon model='none'/>
</devices>
<qemu:commandline>
<qemu:arg value='-netdev'/>
<qemu:arg value='tap,id=tapnet,ifname=tap1,script=no'/>
<qemu:arg value='-device'/>
<qemu:arg value='rtl8139,netdev=tapnet'/>
</qemu:commandline>
</domain>