天天实时：43-KVM虚拟化-利用libvirt服务进行KVM虚拟机管理

[root@ubuntu2204 ~]#virsh list --all Id Name State------------------------------------ 2 centos7-mooreyxia running - rocky8 shut off[root@ubuntu2204 ~]#systemctl status libvirtd● libvirtd.service - Virtualization daemon Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2022-12-31 17:53:28 CST; 17h agoTriggeredBy: ● libvirtd-ro.socket ● libvirtd.socket ● libvirtd-admin.socket Docs: man:libvirtd(8) https://libvirt.org Main PID: 871 (libvirtd) Tasks: 23 (limit: 32768) Memory: 72.6M CPU: 9.258s CGroup: /system.slice/libvirtd.service ├─871 /usr/sbin/libvirtd ├─987 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper └─988 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelperDec 31 17:53:30 ubuntu2204.wang.org dnsmasq[987]: using nameserver 127.0.0.53#53Dec 31 17:53:30 ubuntu2204.wang.org dnsmasq[987]: read /etc/hosts - 7 addressesDec 31 17:53:30 ubuntu2204.wang.org dnsmasq[987]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addressesDec 31 17:53:30 ubuntu2204.wang.org dnsmasq-dhcp[987]: read /var/lib/libvirt/dnsmasq/default.hostsfileJan 01 11:11:55 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPDISCOVER(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:11:55 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPOFFER(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:11:55 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPREQUEST(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:11:55 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPACK(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:18:35 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPREQUEST(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:18:35 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPACK(virbr0) 192.168.122.23 52:54:00:18:b7:d2#停止libvirtd服务，socket还在运行，systemctl会自动激活socket，所以libvirtd会自动重启[root@ubuntu2204 ~]#systemctl stop libvirtdWarning: Stopping libvirtd.service, but it can still be activated by: libvirtd-ro.socket libvirtd.socket libvirtd-admin.socket[root@ubuntu2204 ~]#systemctl status libvirtd-ro.socket● libvirtd-ro.socket - Libvirt local read-only socket Loaded: loaded (/lib/systemd/system/libvirtd-ro.socket; enabled; vendor preset: enabled) Active: active (listening) since Sat 2022-12-31 17:53:24 CST; 17h ago Triggers: ● libvirtd.service Listen: /run/libvirt/libvirt-sock-ro (Stream) CGroup: /system.slice/libvirtd-ro.socketDec 31 17:53:24 ubuntu2204.wang.org systemd[1]: Listening on Libvirt local read-only socket.[root@ubuntu2204 ~]#systemctl status libvirtd○ libvirtd.service - Virtualization daemon Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled) Active: inactive (dead) since Sun 2023-01-01 11:27:32 CST; 1min 32s agoTriggeredBy: ● libvirtd-ro.socket ● libvirtd.socket ● libvirtd-admin.socket Docs: man:libvirtd(8) https://libvirt.org Process: 871 ExecStart=/usr/sbin/libvirtd $LIBVIRTD_ARGS (code=exited, status=0/SUCCESS) Main PID: 871 (code=exited, status=0/SUCCESS) Tasks: 2 (limit: 32768) Memory: 57.1M CPU: 9.370s CGroup: /system.slice/libvirtd.service ├─987 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper └─988 /usr/sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelperJan 01 11:11:55 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPREQUEST(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:11:55 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPACK(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:18:35 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPREQUEST(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:18:35 ubuntu2204.wang.org dnsmasq-dhcp[987]: DHCPACK(virbr0) 192.168.122.23 52:54:00:18:b7:d2Jan 01 11:27:32 ubuntu2204.wang.org systemd[1]: Stopping Virtualization daemon...Jan 01 11:27:32 ubuntu2204.wang.org systemd[1]: libvirtd.service: Deactivated successfully.Jan 01 11:27:32 ubuntu2204.wang.org systemd[1]: libvirtd.service: Unit process 987 (dnsmasq) remains running after unit stopped.Jan 01 11:27:32 ubuntu2204.wang.org systemd[1]: libvirtd.service: Unit process 988 (dnsmasq) remains running after unit stopped.Jan 01 11:27:32 ubuntu2204.wang.org systemd[1]: Stopped Virtualization daemon.Jan 01 11:27:32 ubuntu2204.wang.org systemd[1]: libvirtd.service: Consumed 9.370s CPU time.#彻底停掉libvirt服务，发现虚拟机还在运行，只是连接虚拟机的窗口失效[root@ubuntu2204 ~]#systemctl stop libvirtd libvirtd.socket libvirtdadmin.socket libvirtd-ro.socketFailed to stop libvirtdadmin.socket: Unit libvirtdadmin.socket not loaded.[root@ubuntu2204 ~]#virsh list --allerror: failed to connect to the hypervisorerror: Failed to connect socket to "/var/run/libvirt/libvirt-sock": Connection refused[root@ubuntu2204 ~]#ps aux |grep kvmroot 1247 0.0 0.0 0 0 ? I 10:52 0:02 [kworker/5:0-kvm-irqfd-cleanup]libvirt+ 1575 5.8 3.2 3853876 532360 ? Sl 11:17 0:55 /usr/bin/qemu-system-x86_64 -name guest=centos7-mooreyxia,debug-threads=on -S -object {"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-2-centos7-mooreyxia/master-key.aes"} -machine pc-q35-6.2,usb=off,vmport=off,dump-guest-core=off,memory-backend=pc.ram -accel kvm -cpu host,migratable=on -m 2048 -object {"qom-type":"memory-backend-ram","id":"pc.ram","size":2147483648} -overcommit mem-lock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 3492dccc-468d-4fe9-8ec8-b4a251dccf00 -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=33,server=on,wait=off -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device pcie-root-port,port=16,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 -device pcie-root-port,port=17,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 -device pcie-root-port,port=18,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 -device pcie-root-port,port=19,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 -device pcie-root-port,port=20,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 -device pcie-root-port,port=21,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 -device pcie-root-port,port=22,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 -device pcie-root-port,port=23,chassis=8,id=pci.8,bus=pcie.0,addr=0x2.0x7 -device pcie-root-port,port=24,chassis=9,id=pci.9,bus=pcie.0,multifunction=on,addr=0x3 -device pcie-root-port,port=25,chassis=10,id=pci.10,bus=pcie.0,addr=0x3.0x1 -device pcie-root-port,port=26,chassis=11,id=pci.11,bus=pcie.0,addr=0x3.0x2 -device pcie-root-port,port=27,chassis=12,id=pci.12,bus=pcie.0,addr=0x3.0x3 -device pcie-root-port,port=28,chassis=13,id=pci.13,bus=pcie.0,addr=0x3.0x4 -device pcie-root-port,port=29,chassis=14,id=pci.14,bus=pcie.0,addr=0x3.0x5 -device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 -device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 -blockdev {"driver":"file","filename":"/var/lib/libvirt/images/centos7-mooreyxia.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-2-format","read-only":false,"discard":"unmap","driver":"qcow2","file":"libvirt-2-storage","backing":null} -device virtio-blk-pci,bus=pci.4,addr=0x0,drive=libvirt-2-format,id=virtio-disk0,bootindex=1 -device ide-cd,bus=ide.0,id=sata0-0-0 -netdev tap,fd=34,id=hostnet0,vhost=on,vhostfd=36 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:18:b7:d2,bus=pci.1,addr=0x0 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,fd=32,server=on,wait=off -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -chardev spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -audiodev {"id":"audio1","driver":"spice"} -spice port=5900,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1 -device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0,audiodev=audio1 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 -device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 -object {"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"} -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.6,addr=0x0 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=onroot 1581 0.0 0.0 0 0 ? S 11:17 0:00 [kvm-nx-lpage-re]root 1586 0.0 0.0 0 0 ? S 11:17 0:00 [kvm-pit/1575]root 1781 0.0 0.0 9696 2404 pts/1 S+ 11:33 0:00 grep --color=auto kvm#重启libvirtd服务，就可以继续连接kvm进行管理[root@ubuntu2204 ~]#systemctl start libvirtd [root@ubuntu2204 ~]#virsh list --all Id Name State------------------------------------ 2 centos7-mooreyxia running - rocky8 shut off

#virsh 主要功能[root@ubuntu2204 ~]#virsh --helpvirsh [options]... []virsh [options]... [args...]options:-c | --connect=URI hypervisor connection URI-d | --debug=NUM debug level [0-4]-e | --escape set escape sequence for console-h | --help this help-k | --keepalive-interval=NUMkeepalive interval in seconds, 0 for disable-K | --keepalive-count=NUMnumber of possible missed keepalive messages-l | --log=FILE output logging to file-q | --quiet quiet mode-r | --readonly connect readonly-t | --timing print timing information-v short version-V long version--version[=TYPE] version, TYPE is short or long (default short)....Domain Management (help keyword "domain"):Domain Monitoring (help keyword "monitor"):Host and Hypervisor (help keyword "host"):Interface (help keyword "interface"):Network Filter (help keyword "filter"):Networking (help keyword "network"):Node Device (help keyword "nodedev"):Secret (help keyword "secret"):Snapshot (help keyword "snapshot"):Storage Pool (help keyword "pool"):Storage Volume (help keyword "volume"):Virsh itself (help keyword "virsh"):#virsh 子命令说明help #打印基本帮助信息attach-device #使用XML文件中的设备定义在虚拟机中添加设备attach-disk #在虚拟机中附加新磁盘设备attach-interface #在虚拟机中附加新网络接口create #从 XML 配置文件生成虚拟机并启动新虚拟机define #为虚拟机输出XML配置文件destroy #强制虚拟机停止detach-device #从虚拟机中分离设备，使用同样的XML 描述作为命令attach-devicedetach-disk #从虚拟机中分离磁盘设备detach-interface #从虚拟机中分离网络接口domblkstat #显示正在运行的虚拟机的块设备统计domid #显示虚拟机IDdomifstat #显示正在运行的虚拟机的网络接口统计dominfo #显示虚拟机信息domname #显示虚拟机名称domstate #显示虚以机状态domuuid #显示虚拟机UUIDdumpxml #输出虚拟机 XML配置文件list #列出所有虚拟机migrate #将虚拟机迁移到另一台主机中nodeinfo #有关管理程序的输出信息quit #退出这个互动终端reboot #重新启动虚拟机restore #恢复以前保存在文件中的虚拟机resume #恢复暂停的虚拟机save #将虚拟机当前状态保存到某个文件中setmaxmem #为管理程序设定内存上限setmem #为虚拟机设定分配的内存setvcpus #修改为虚拟机分配的虚拟CPU数目shutdown #关闭某个虚拟机start #启动未激活的虚拟机suspend #暂停虚拟机undefine #删除与虚拟机关联的所有文件vepuinfo #显示虚以机的虚拟CPU信息vcpupin #控制虚拟机的虚拟CPU亲和性version #显示virsh版本#查看子命令 list 命令用法[root@ubuntu2204 ~]#virsh help list NAME list - list domains SYNOPSIS list [--inactive] [--all] [--transient] [--persistent] [--with-snapshot] [--without-snapshot] [--with-checkpoint] [--without-checkpoint] [--state-running] [--state-paused] [--state-shutoff] [--state-other] [--autostart] [--no-autostart] [--with-managed-save] [--without-managed-save] [--uuid] [--name] [--id] [--table] [--managed-save] [--title] DESCRIPTION Returns list of domains. OPTIONS --inactive list inactive domains --all list inactive & active domains --transient list transient domains --persistent list persistent domains --with-snapshot list domains with existing snapshot --without-snapshot list domains without a snapshot --with-checkpoint list domains with existing checkpoint --without-checkpoint list domains without a checkpoint --state-running list domains in running state --state-paused list domains in paused state --state-shutoff list domains in shutoff state --state-other list domains in other states --autostart list domains with autostart enabled --no-autostart list domains with autostart disabled --with-managed-save list domains with managed save state --without-managed-save list domains without managed save --uuid list uuid"s only --name list domain names only --id list domain IDs only --table list table (default) --managed-save mark inactive domains with managed save state --title show domain title例：[root@ubuntu2204 ~]#virsh list --all Id Name State------------------------------------ 2 centos7-mooreyxia running - rocky8 shut off[root@ubuntu2204 ~]#virsh start rocky8Domain "rocky8" started[root@ubuntu2204 ~]#virsh list --all Id Name State----------------------------------- 2 centos7-mooreyxia running 3 rocky8 running[root@ubuntu2204 ~]#virsh shutdown 3Domain "3" is being shutdown#列出开机状态虚拟机的UUID和名称[root@ubuntu2204 ~]#virsh list --uuid --name3492dccc-468d-4fe9-8ec8-b4a251dccf00 centos7-mooreyxia3a984e57-70f4-428d-8f30-3127dd4e9be2 rocky8

[root@ubuntu2204 ~]#virsh list --all Id Name State----------------------------------- 2 centos7-mooreyxia running 3 rocky8 running[root@ubuntu2204 ~]#virsh domuuid 33a984e57-70f4-428d-8f30-3127dd4e9be2[root@ubuntu2204 ~]#virsh destroy 3a984e57-70f4-428d-8f30-3127dd4e9be2Domain "3a984e57-70f4-428d-8f30-3127dd4e9be2" destroyed[root@ubuntu2204 ~]#virsh list --all Id Name State------------------------------------ 2 centos7-mooreyxia running - rocky8 shut off

[root@ubuntu2204 ~]#virsh list Id Name State----------------------------------- 2 centos7-mooreyxia running[root@ubuntu2204 ~]#virsh suspend centos7-mooreyxiaDomain "centos7-mooreyxia" suspended[root@ubuntu2204 ~]#virsh list Id Name State---------------------------------- 2 centos7-mooreyxia paused[root@ubuntu2204 ~]#ps aux|grep kvmroot 1247 0.0 0.0 0 0 ? I 10:52 0:02 [kworker/5:0-kvm-irqfd-cleanup]libvirt+ 1575 2.3 3.3 3862072 550556 ? Sl 11:17 1:13 /usr/bin/qemu-system-x86_64 -name guest=centos7-mooreyxia,debug-threads=on -S -object {"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-2-centos7-mooreyxia/master-key.aes"} -machine pc-q35-6.2,usb=off,vmport=off,dump-guest-core=off,memory-backend=pc.ram -accel kvm -cpu host,migratable=on -m 2048 -object {"qom-type":"memory-backend-ram","id":"pc.ram","size":2147483648} -overcommit mem-lock=off -smp 2,sockets=2,cores=1,threads=1 -uuid 3492dccc-468d-4fe9-8ec8-b4a251dccf00 -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=33,server=on,wait=off -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device pcie-root-port,port=16,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 -device pcie-root-port,port=17,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 -device pcie-root-port,port=18,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 -device pcie-root-port,port=19,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 -device pcie-root-port,port=20,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 -device pcie-root-port,port=21,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 -device pcie-root-port,port=22,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6 -device pcie-root-port,port=23,chassis=8,id=pci.8,bus=pcie.0,addr=0x2.0x7 -device pcie-root-port,port=24,chassis=9,id=pci.9,bus=pcie.0,multifunction=on,addr=0x3 -device pcie-root-port,port=25,chassis=10,id=pci.10,bus=pcie.0,addr=0x3.0x1 -device pcie-root-port,port=26,chassis=11,id=pci.11,bus=pcie.0,addr=0x3.0x2 -device pcie-root-port,port=27,chassis=12,id=pci.12,bus=pcie.0,addr=0x3.0x3 -device pcie-root-port,port=28,chassis=13,id=pci.13,bus=pcie.0,addr=0x3.0x4 -device pcie-root-port,port=29,chassis=14,id=pci.14,bus=pcie.0,addr=0x3.0x5 -device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 -device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 -blockdev {"driver":"file","filename":"/var/lib/libvirt/images/centos7-mooreyxia.qcow2","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"} -blockdev {"node-name":"libvirt-2-format","read-only":false,"discard":"unmap","driver":"qcow2","file":"libvirt-2-storage","backing":null} -device virtio-blk-pci,bus=pci.4,addr=0x0,drive=libvirt-2-format,id=virtio-disk0,bootindex=1 -device ide-cd,bus=ide.0,id=sata0-0-0 -netdev tap,fd=34,id=hostnet0,vhost=on,vhostfd=36 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:18:b7:d2,bus=pci.1,addr=0x0 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,fd=32,server=on,wait=off -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -chardev spicevmc,id=charchannel1,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -audiodev {"id":"audio1","driver":"spice"} -spice port=5900,addr=127.0.0.1,disable-ticketing=on,image-compression=off,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1 -device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0,audiodev=audio1 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3 -device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 -object {"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"} -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.6,addr=0x0 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=onroot 1581 0.0 0.0 0 0 ? S 11:17 0:00 [kvm-nx-lpage-re]root 1586 0.0 0.0 0 0 ? S 11:17 0:00 [kvm-pit/1575]root 2244 0.0 0.0 9696 2268 pts/1 S+ 12:09 0:00 grep --color=auto kvm[root@ubuntu2204 ~]#virsh resume centos7-mooreyxiaDomain "centos7-mooreyxia" resumed[root@ubuntu2204 ~]#virsh list Id Name State----------------------------------- 2 centos7-mooreyxia running

#未勾选开机启动时[root@ubuntu2204 ~]#virsh list --all Id Name State------------------------------------ 2 centos7-mooreyxia running - rocky8 shut off#每个虚拟机配置都存放在/etc/libvirt/qemu目录下的xml文件中[root@ubuntu2204 ~]#ll /etc/libvirt/qemu/total 28drwxr-xr-x 3 root root 4096 Dec 31 00:18 ./drwxr-xr-x 7 root root 4096 Dec 29 20:24 ../-rw------- 1 root root 7673 Dec 29 21:36 centos7-mooreyxia.xmldrwxr-xr-x 3 root root 4096 Dec 29 19:10 networks/-rw------- 1 root root 7078 Dec 30 22:44 rocky8.xml#查看XML配置文件[root@ubuntu2204 ~]#cat /etc/libvirt/qemu/centos7-mooreyxia.xml centos7-mooreyxia 3492dccc-468d-4fe9-8ec8-b4a251dccf00 2097152 2097152 2 hvm destroy restart destroy

/usr/bin/qemu-system-x86_64

...

#设置虚拟机随宿主机启动而自动启动,本质就是在下面目录生成软链接-------------------------------------#图形界面操作可以用命令代替virsh autostart centos7-mooreyxia----------------------------------------#生成了autostart/centos7-mooreyxia.xml 软链接指向虚拟机配置文件[root@ubuntu2204 ~]#ll /etc/libvirt/qemu/total 32drwxr-xr-x 4 root root 4096 Jan 1 12:24 ./drwxr-xr-x 7 root root 4096 Dec 29 20:24 ../drwxr-xr-x 2 root root 4096 Jan 1 12:24 autostart/-rw------- 1 root root 7673 Jan 1 12:24 centos7-mooreyxia.xmldrwxr-xr-x 3 root root 4096 Dec 29 19:10 networks/-rw------- 1 root root 7078 Dec 30 22:44 rocky8.xml[root@ubuntu2204 ~]#ll /etc/libvirt/qemu/autostart/total 8drwxr-xr-x 2 root root 4096 Jan 1 12:24 ./drwxr-xr-x 4 root root 4096 Jan 1 12:24 ../lrwxrwxrwx 1 root root 39 Jan 1 12:24 centos7-mooreyxia.xml -> /etc/libvirt/qemu/centos7-mooreyxia.xml

[root@centos8 ~]#virsh list --allId Name State----------------------------------------------------2 centos8 running- centos7 shut off- centos8-vm2 shut off- centos8-vm3 shut off- centos8-vm4 shut off- Win_2008_r2-x86_64 shut off#删除虚拟机配置,但不删除磁盘文件[root@centos8 ~]#virsh undefine centos8-vm4Domain centos8-vm4 has been undefined[root@centos8 ~]#virsh list --allId Name State----------------------------------------------------2 centos8 running- centos7 shut off- centos8-vm2 shut off- centos8-vm3 shut off- Win_2008_r2-x86_64 shut off#对应虚拟机xml的配置文件被删除[root@centos8 ~]#ll /etc/libvirt/qemu/total 28drwxr-xr-x 2 root root 25 Sep 17 18:54 autostart-rw------- 1 root root 3618 Sep 17 15:14 centos7.xml-rw------- 1 root root 3673 Sep 13 22:43 centos8-vm2.xml-rw------- 1 root root 3601 Sep 13 22:42 centos8-vm3.xml-rw------- 1 root root 6024 Sep 17 15:47 centos8.xmldrwx------ 3 root root 42 Sep 13 19:03 networks-rw------- 1 root root 5369 Sep 17 11:31 Win_2008_r2-x86_64.xml#对应的磁盘文件并没有删除[root@centos8 ~]#ls /var/lib/libvirt/images/centos7.qcow2 centos8.qcow2 centos8-vm2.qcow2 centos8-vm3.qcow2 centos8-vm4.qcow2 Windows-2008_r2-x86_64.qcow2--------------------------------------------------------#删除虚拟机包括磁盘文件[root@ubuntu2004 ~]#virsh undefine k8s-node-05 --remove-all-storageDomain k8s-node-05 has been undefinedVolume "vda"(/var/lib/libvirt/images/k8s-node-05.qcow2) removed.

#在一台目标宿主机安装相关虚拟化软件[root@ubuntu2004 ~]#apt update[root@ubuntu2004 ~]#apt -y install qemu-kvm virt-manager libvirt-daemon-system#在源宿主机查看虚拟机的相关文件[root@ubuntu2004 ~]#virsh dumpxml --domain rocky8-template...........#或者#查看块设备[root@ubuntu2004 ~]#virsh domblklist rocky8-templateTarget Source------------------------------------------------vda /var/lib/libvirt/images/rocky8-template.qcow2vdb -#复制源宿主机上的虚拟机的两个文件到目标宿主机[root@ubuntu2004 ~]#scp /etc/libvirt/qemu/rocky8-template.xml10.0.0.101:/etc/libvirt/qemu/[root@ubuntu2004 ~]#scp /var/lib/libvirt/images/rocky8-template.qcow210.0.0.101:/var/lib/libvirt/images#在目标宿主机不重启服务无法看到新的虚拟机[root@ubuntu2004 ~]#virsh list --all[root@ubuntu2004 ~]#systemctl restart libvirtd#在目标宿主机重启服务后看到新的虚拟机[root@ubuntu2004 ~]#virsh list --allId Name State----------------------------------rocky8-template shut off

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