VirtualBox虚拟管理之virsh

- list [--all]：列出虚拟机
- nodeinfo:                                             查看真机信息
- 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

[root@desktop ~]# virsh list # 列出所有运行的虚拟机
Id    Name                           State
1     proxy                          running
4     web1                           running
5     web2                           running
13    cache                          running
[root@desktop ~]# virsh list --all  # 列出所有虚拟机
Id    Name                           State
1     proxy                          running
4     web1                           running
5     web2                           running
13    cache                          running
-     client                         shut off
-     db1                            shut off
-     db2                            shut off
-     dns                            shut off
[root@desktop vm]# virsh hostname  # 列出真机主机名
desktop
[root@desktop vm]# virsh sysinfo   # 列出真机的详细信息
<sysinfo type='smbios'>
    <bios>
        <entry name='vendor'>HP</entry>
        <entry name='version'>Q50 Ver. 01.06.04</entry>
        <entry name='date'>02/07/2020</entry>
        <entry name='release'>6.4</entry>
    </bios>
        ...
    </memory_device>
</sysinfo>
[root@desktop vm]# virsh nodecpustats  # 得到真机cpu状态
user:                565188290000000
system:              889250070000000
idle:              22823238820000000
iowait:               10113440000000
[root@desktop vm]# virsh nodememstats   # 得到真机内存状态
total  :              7778448 KiB
free   :               469008 KiB
buffers:                  136 KiB
cached :               357196 KiB
[root@desktop vm]# virsh node-memory-tune  # 允许你设置的node内存参数
Shared memory:
    shm_pages_to_scan 1250
    shm_sleep_millisecs 21
    shm_pages_shared 28710
    shm_pages_sharing 133337
    shm_pages_unshared 140701
    shm_pages_volatile 1451
    shm_full_scans  92316
    shm_merge_across_nodes 1
[root@desktop vm]# virsh capabilities  # 打印虚拟机的特点
<capabilities>
    <host>
        <uuid>39f13a7f-d328-0fb6-3508-5f1fea3d5774</uuid>
    <cpu>
        <arch>x86_64</arch>
        <model>Skylake-Client-IBRS</model>
        <vendor>Intel</vendor>
    ...
</capabilities>
[root@desktop vm]# virsh freecell  # 打印虚拟机中可用内存
Total: 192656 KiB

- start|shutdown|reboot <vm-name>:    虚拟机启动、停止、重启
- destroy <vm-name>:                           强制停止虚拟机
- define <vm-name>.xml:                      根据xml文件创建
- undefine <vm-name>:                         根据虚拟机名称删除虚拟机
- console <vm-name>:                           连接虚拟机的console
- edit <vm-name> :                                修改虚拟机配置
- autostart <vm-name>:                         设置虚拟机自启动
- domiflist <vm-name>:                          查看虚拟机网卡信息
- domblklist <vm-name>:                        查看虚拟机硬盘信息
- dominfo <vm-name>:                           列出指定虚拟机的信息
- suspend <vm-name>:                           挂起指定虚拟机
- resume <vm-name>：恢复挂起的虚拟机

[root@desktop ~]# virsh list --all
Id    Name                           State
1     proxy                          running
4     web1                           running
5     web2                           running
16    cache                          running
18    dns                            running
-     client                         shut off
-     db1                            shut off
-     db2                            shut off
[root@desktop ~]# virsh shutdown dns # 关闭虚拟机dns
Domain dns is being shutdown
[root@desktop ~]# virsh start dns    # 启动虚拟机dns
Domain dns started
[root@desktop vm]# virsh dumpxml dns > dns.xml   # 导出dns虚拟机的配置文件
[root@desktop vm]# ls
dns.xml
[root@desktop vm]# virsh undefine dns            # 删除dns虚拟机
Domain dns has been undefined
[root@desktop vm]# virsh list --all
Id    Name                           State
1     proxy                          running
4     web1                           running
5     web2                           running
16    cache                          running
-     client                         shut off
-     db1                            shut off
-     db2                            shut off
[root@desktop vm]# virsh define dns.xml           # 从xml配置文件生成一个虚拟机
Domain dns defined from dns.xml
[root@desktop vm]# virsh list --all
Id    Name                           State
1     proxy                          running
4     web1                           running
5     web2                           running
16    cache                          running
-     client                         shut off
-     db1                            shut off
-     db2                            shut off
-     dns                            shut off
[root@desktop vm]# virsh start dns
Domain dns started
[root@desktop vm]# virsh reboot dns               # 重启虚拟机dns
Domain dns is being rebooted
[root@desktop vm]# virsh autostart dns            # 设置虚拟机dns开机自启
Domain dns marked as autostarted
[root@desktop vm]# virsh autostart --disable dns  # 取消虚拟机dns开机自启
Domain dns unmarked as autostarted
[root@desktop vm]# virsh domiflist dns            # 显示虚拟机网卡接口
Interface  Type       Source     Model       MAC
[root@desktop vm]# virsh domblklist dns            # 显示虚拟机磁盘文件
Target     Source
vda        opt/vm/dns.qcow2
[root@desktop vm]# virsh dominfo dns               # 显示虚拟机的信息
Id:             20
Name:           dns
UUID:           b8024ffe-9c00-4570-a802-72a94e6576ca
OS Type:        hvm
State:          running
CPU(s):         1
CPU time:       22.1s
Max memory:     2097152 KiB
Used memory:    2097152 KiB
Persistent:     yes
Autostart:      disable
Managed save:   no
Security model: selinux
Security DOI:   0
Security label: system_u:system_r:svirt_t:s0:c502,c596 (enforcing)
[root@desktop vm]# virsh suspend dns               # 挂起虚拟机
Domain dns suspended
[root@desktop vm]# virsh list
Id    Name                           State
1     proxy                          running
4     web1                           running
5     web2                           running
16    cache                          running
20    dns                            paused
[root@desktop vm]# virsh resume dns                # 继续运行挂起的虚拟机
Domain dns resumed
[root@desktop vm]# virsh desc dns                  # 显示虚拟机的描述信息
No description for domain: dns

- domjobabort <vm-name>:            获取虚拟机的当前任务
- dojobinfo <vm-name>:                显示虚拟机的任务
- domstat <vm-name> :                   显示虚拟机的状态
- domcontrol<vm-name>:              返回虚拟机的状态ok or error
- dumpxml<vm-name>:                  直接显示demo的xml文件配置
- edit <vm-name>:                            编辑主机的配置文件
- cpu-stats <vm-name>:                   虚拟机的cpu状态

[root@desktop vm]# virsh domjobabort dns
error: Requested operation is not valid: no job is active on the domain
[root@desktop vm]# virsh domjobinfo dns
Job type:         None
[root@desktop vm]# virsh domstats dns
Domain: 'dns'
state.state=1
state.reason=5
cpu.time=33212300555
cpu.user=900000000
cpu.system=4380000000
balloon.current=2097152
balloon.maximum=2097152
balloon.swap_in=0
balloon.swap_out=0
balloon.major_fault=189
balloon.minor_fault=161771
balloon.unused=1879292
balloon.available=2046976
balloon.last-update=1647332025
balloon.rss=492880
vcpu.current=1
vcpu.maximum=1
vcpu.0.state=1
vcpu.0.time=23010000000
vcpu.0.wait=0
net.count=0
block.count=1
block.0.name=vda
block.0.path=/opt/vm/dns.qcow2
block.0.rd.reqs=10188
block.0.rd.bytes=281963008
block.0.rd.times=1698863549
block.0.wr.reqs=237
block.0.wr.bytes=10442240
block.0.wr.times=574631962
block.0.fl.reqs=68
block.0.fl.times=195155558
block.0.allocation=31348801024
block.0.capacity=42949672960
block.0.physical=3388030976
[root@desktop vm]# virsh domcontrol dns
ok
[root@desktop vm]# virsh cpu-stats dns
CPU0:
cpu_time             1.840709161 seconds
vcpu_time            0.571028679 seconds
CPU1:
cpu_time             2.275045726 seconds
vcpu_time            0.665116430 seconds
CPU2:
cpu_time             6.915661248 seconds
vcpu_time            5.527787781 seconds
CPU3:
cpu_time             3.793130275 seconds
vcpu_time            2.515854323 seconds
CPU4:
cpu_time             2.442409053 seconds
vcpu_time            1.154978564 seconds
CPU5:
cpu_time             4.330489085 seconds
vcpu_time            3.044157700 seconds
CPU6:
cpu_time             1.997121055 seconds
vcpu_time            0.439759919 seconds
CPU7:
cpu_time            10.725541636 seconds
vcpu_time            9.225345458 seconds
Total:
cpu_time            34.320107239 seconds
user_time            0.900000000 seconds
system_time          4.400000000 seconds

- screenshot <vm-name>:                    虚拟机截屏
- setmen <vm-name> size:                    设置虚拟机的内存
- setmaxmen <vm-name>                     设置虚拟机的最大内存
- memtune     <vm-name>                      得到虚拟机分区的信息
- blkiotune      <vm-name>                       得到虚拟机的磁盘信息
- setvcpus（<vm-name> count）          设置虚拟机的虚拟cpu个数
- dompmwakeup(<vm-name>)                唤醒挂起的vm-name
- ttyconsole <vm-name>                          输出设备用的终端
- vcpucount <vm-name>                          得到cpu个数
- vcpuinfo<vm-name>                           得到cpu的信息
- vncdisplay<vm-name>                           显示虚拟机vnc连接信息

[root@desktop ~]# virsh memtune dns   # 得到虚拟机分区的信息
hard_limit     : unlimited
soft_limit     : unlimited
swap_hard_limit: unlimited
[root@desktop ~]# virsh blkiotune dns  # 得到虚拟机的磁盘信息
weight         : 500
device_weight  :
device_read_iops_sec:
device_write_iops_sec:
device_read_bytes_sec:
device_write_bytes_sec:
[root@desktop ~]# virsh ttyconsole dns   # 输出设备用的终端
/dev/pts/13
[root@desktop ~]# virsh vcpucount dns    # 获取虚拟机cpu数目
maximum      config         1
maximum      live           1
current      config         1
current      live           1
[root@desktop ~]# virsh vcpuinfo dns     # Huoqu虚拟机CPU信息
VCPU:           0
CPU:            1
State:          running
CPU time:       27.0s
CPU Affinity:   yyyyyyyy
[root@desktop ~]# virsh vncdisplay dns   #  显示虚拟机vnc连接信息
:4
[root@desktop ~]# virsh dumpxml proxy | grep mac  # 宿主机上获取虚拟机proxy的IP地址
<partition>/machine</partition>
<type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
<mac address='52:54:00:47:14:ea'/>
<mac address='52:54:00:85:73:e9'/>
[root@desktop ~]#
[root@desktop ~]#
[root@desktop ~]# arp -a | grep '52:54:00:47:14:ea'
? (192.168.3.3) at 52:54:00:47:14:ea [ether] on br5

- net-autostart <networkname>           自动启动网卡（default）
- net-define <file>                                    把配置加载到文件
- net-destory <networkname>                 关闭网卡
- net-dumpxml <networkname>               把网卡配置加载到文件
- net-edit <networkname>                       编辑网卡信息
- net-info  <networkname>                      网卡信息
- net-list                                                   显示网卡
- net-uuid <networkname>                      得到网卡的id
- net-name  <id>                                     得到网卡的名字
- net-start <networkname>                      开启网卡

[root@desktop vm]# virsh net-list --all     # 显示所有虚拟网络
Name                 State      Autostart     Persistent
default              active     yes           yes
lab                  active     yes           yes
office               active     yes           yes
[root@desktop vm]# virsh net-define lab2.xml  # 从配置文件生成一个虚拟网络
Network lab2 defined from lab2.xml
[root@desktop vm]# virsh net-list --all
Name                 State      Autostart     Persistent
default              active     yes           yes
lab                  active     yes           yes
lab2                 inactive   no            yes
office               active     yes           yes
[root@desktop vm]# virsh net-dumpxml lab > lab.xml   # 把虚拟网络配置保存到文件
[root@desktop vm]# virsh net-info lab
Name:           lab
UUID:           ed7ac3a2-da2b-4511-bdcc-e385d029dbd9
Active:         yes
Persistent:     yes
Autostart:      yes
Bridge:         virbr2
[root@desktop vm]# virsh net-uuid lab    #  得到虚拟的uuid
ed7ac3a2-da2b-4511-bdcc-e385d029dbd9
[root@desktop vm]# virsh net-start lab2  # 启动虚拟网络
Network lab2 started
[root@desktop vm]# virsh net-list --all
Name                 State      Autostart     Persistent
default              active     yes           yes
lab                  active     yes           yes
lab2                 active     no            yes
office               active     yes           yes
[root@desktop vm]# virsh net-destroy lab2   ￥ 停止指定的虚拟网络
Network lab2 destroyed
[root@desktop vm]# virsh net-list --all
Name                 State      Autostart     Persistent
default              active     yes           yes
lab                  active     yes           yes
lab2                 inactive   no            yes
office               active     yes           yes
[root@desktop vm]# virsh net-undefine lab2  # 删除指定的虚拟网络
Network lab2 has been undefined
[root@desktop vm]# virsh net-list --all
Name                 State      Autostart     Persistent
default              active     yes           yes
lab                  active     yes           yes
office               active     yes           yes

- attach-device (<vm-name> file)               使用XML文件中设备定义在虚拟机中添加设备
- attach-disk (<vm-name>  )                       添加磁盘文件
- attach-interface (<vm-name> type source )      添加一个接口
- update-device (<vm-name> file)                    更新设备根据file

[root@desktop vm]# qemu-img create -f qcow2 test1.qcow2 1g # 创建一个1G磁盘的磁盘文件
Formatting 'test1.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 lazy_refcounts=off
[root@desktop vm]# qemu-img create -f qcow2 test2.qcow2 1g #  # 创建一个1G磁盘的磁盘文件
Formatting 'test2.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 lazy_refcounts=off
[root@desktop vm]# ls
dns.xml  installdisk.xml  lab2.xml  lab.xml  test1.qcow2  test2.qcow2
[root@desktop vm]# cat installdisk.xml  # 编辑一个xml文件
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/root/vm/test1.qcow2'/>
<target dev='vdb'/>
</disk>
[root@desktop ~]# virsh domblklist dns  # 查看虚拟机的磁盘文件
Target     Source
vda        opt/vm/dns.qcow2
[root@desktop vm]# virsh attach-device --domain dns installdisk.xml  # 使用XML文件中的设备定义在虚拟机中添加设备
Device attached successfully
[root@desktop vm]# virsh domblklist dns
Target     Source
vda        opt/vm/dns.qcow2
vdb        root/vm/test1.qcow2
[root@desktop vm]# virsh attach-disk --domain dns --source root/vm/test2.qcow2 --target vdc  --subdriver qcow2 --config --live  # 虚拟机添加磁盘文件
Disk attached successfully
[root@desktop vm]# virsh domblklist dns
Target     Source
vda        opt/vm/dns.qcow2
vdb        root/vm/test1.qcow2
vdc        /root/vm/test2.qcow2
[root@desktop vm]# virsh detach-disk dns vdc  # 从虚拟机删除磁盘
Disk detached successfully
[root@desktop vm]# virsh detach-disk dns vdb
Disk detached successfully
[root@desktop vm]# virsh domblklist dns
Target     Source
vda        /opt/vm/dns.qcow2
[root@desktop vm]# virsh domiflist dns
Interface  Type       Source     Model       MAC
[root@desktop vm]# virsh attach-interface dns --type network --source default --model virtio  # 添加网卡，连接虚拟网络
Interface attached successfully
[root@desktop vm]# virsh domiflist dns
Interface  Type       Source     Model       MAC
vnet5      network    default    virtio      52:54:00:4d:69:d7

- iface-define（file）            从文件里面定义一个接口
- iface-dumpxml （lo）       显示接口的信息
- iface-edit（lo）                  编辑接口
- iface-list                           列出所有的接口
- iface-name （mac）        根据mac得到名字
- iface-mac     (lo)           根据名字得到mac
- iface-start  （lo）         开启接口
- iface-unbriged                 解绑定网桥
- iface-undefine（lo）     不定义配置文件
- iface-begin（lo）          创建一个现有的接口设置
- iface-commit                   提交所有的改变有效，并且让接口工作
- iface-rollbak                    接口回滚

[root@desktop vm]# virsh iface-list --all      # 列出所有网卡
Name                 State      MAC Address
br5                  active     00:0e:c6:82:4c:a0
eno1                 active     84:a9:3e:82:23:37
enp1s0f0             inactive   6c:b3:11:40:f1:46
enp1s0f1             inactive   6c:b3:11:40:f1:47
lo                   active     00:00:00:00:00:00
[root@desktop vm]# virsh iface-dumpxml eno1   # 输出指定网卡信息
<interface type='ethernet' name='eno1'>
<protocol family='ipv4'>
<ip address='192.168.50.228' prefix='24'/>
</protocol>
<protocol family='ipv6'>
<ip address='fe80::5669:5b18:2f36:2137' prefix='64'/>
</protocol>
<link speed='1000' state='up'/>
<mac address='84:a9:3e:82:23:37'/>
</interface>
[root@desktop vm]# virsh iface-mac eno1       # 根据网卡名获取MAC地址
84:a9:3e:82:23:37
[root@desktop vm]# virsh iface-name 84:a9:3e:82:23:37  # 根据MAC地址获取网卡名
eno1

- pool-auto （pool）                 标记池自动启动
- pool-build（pool）                  建造一个池
- pool-create（file）                 根据文件创建池
- pool-define（file）                 定义但是不开启
- pool-destory（pool）             销毁池，以后能恢复
- pool-delete（pool）               删除池，以后不能恢复
- pool-dumpxml（pool）          查看池的定义文件
- pool-edit（pool）                  编辑池的定义文件
- pool-info                               池的信息
- pool-list                                 显示池列表
- pool-name（id）                   根据id得到name
- pool-start（poop）                开启池
- pool-uuid （pool）                返回一个池的uuid

[root@desktop vm]# virsh pool-list --all  # 列出所有池
Name                 State      Autostart
bl02u2_test          active     yes
default              active     yes
Downloads            active     yes
images               active     yes
images-1             active     yes
opt                  active     yes
root                 active     yes
vm                   active     yes
[root@desktop vm]# virsh pool-info vm   # 列出池vm的信息
Name:           vm
UUID:           6820e7d5-3210-496e-8573-5a19907b034e
State:          running
Persistent:     yes
Autostart:      yes
Capacity:       325.81 GiB
Allocation:     90.34 GiB
Available:      235.46 GiB
[root@desktop vm]# virsh pool-uuid vm  # 获取池vm的uuid
6820e7d5-3210-496e-8573-5a19907b034e
[root@desktop vm]# virsh pool-dumpxml vm  # 查看池的定义文件
<pool type='dir'>
<name>vm</name>
<uuid>6820e7d5-3210-496e-8573-5a19907b034e</uuid>
<capacity unit='bytes'>349831188480</capacity>
<allocation unit='bytes'>97005137920</allocation>
<available unit='bytes'>252826050560</available>
<source>
</source>
<target>
<path>/opt/vm</path>
<permissions>
<mode>0755</mode>
<owner>0</owner>
<group>0</group>
<label>unconfined_u:object_r:usr_t:s0</label>
</permissions>
</target>
</pool>
[root@desktop vm]# virsh pool-dumpxml images-1 > images-1.xml # 将池信息保存到xml文件中
[root@desktop vm]# virsh pool-destroy images-1                # 停止一个池
Pool images-1 destroyed
[root@desktop vm]# virsh pool-list --all
Name                 State      Autostart
bl02u2_test          active     yes
default              active     yes
Downloads            active     yes
images               active     yes
images-1             inactive   yes
opt                  active     yes
root                 active     yes
vm                   active     yes
[root@desktop vm]# virsh pool-delete images-1  # 删除一个池
Pool images-1 deleted
[root@desktop vm]# virsh pool-define images-1.xml  # 从定义文件生成一个池
Pool images-1 defined from images-1.xml
[root@desktop vm]# virsh pool-start images-1   # 启动一个池
Pool images-1 started
[root@desktop vm]# virsh pool-list
Name                 State      Autostart
bl02u2_test          active     yes
default              active     yes
Downloads            active     yes
images               active     yes
images-1             active     no
opt                  active     yes
root                 active     yes
vm                   active     yes
[root@desktop vm]# virsh pool-autostart  images-1   # 标记指定池自动启动
Pool images-1 marked as autostarted
[root@desktop vm]# virsh pool-list
Name                 State      Autostart
bl02u2_test          active     yes
default              active     yes
Downloads            active     yes
images               active     yes
images-1             active     yes
opt                  active     yes
root                 active     yes
vm                   active     yes

- vol-delete（pool）               卷的删除
- vol-upload（pool）              卷的加载
- vol-list（pool）                    列出卷
- vol-info（default）              卷的信息
- vol-name（path）               得到卷的名字

[root@desktop vm]# virsh vol-list vm   # 查看指定池中的卷
Name                 Path
@1@p                 /opt/vm/@1@p
cache.qcow2          /opt/vm/cache.qcow2
centos2.raw          /opt/vm/centos2.raw
client.qcow2         /opt/vm/client.qcow2
db1.qcow2            /opt/vm/db1.qcow2
db2.qcow2            /opt/vm/db2.qcow2
disk1.qcow2          /opt/vm/disk1.qcow2
disk2.qcow2          /opt/vm/disk2.qcow2
disk3.qcow2          /opt/vm/disk3.qcow2
disk4.qcow2          /opt/vm/disk4.qcow2
disk5.qcow2          /opt/vm/disk5.qcow2
disk6.qcow2          /opt/vm/disk6.qcow2
disk7.qcow2          /opt/vm/disk7.qcow2
disk8.qcow2          /opt/vm/disk8.qcow2
dns.qcow2            /opt/vm/dns.qcow2
dsik9.qcow2          /opt/vm/dsik9.qcow2
nfs.qcow2            /opt/vm/nfs.qcow2
proxy.qcow2          /opt/vm/proxy.qcow2
Server.qcow2         /opt/vm/Server.qcow2
test1.qcow2          /opt/vm/test1.qcow2
test2.qcow2          /opt/vm/test2.qcow2
upload.txt           /opt/vm/upload.txt
web01.qcow2          /opt/vm/web01.qcow2
web02.qcow2          /opt/vm/web02.qcow2
web03.qcow2          /opt/vm/web03.qcow2
web04.qcow2          /opt/vm/web04.qcow2
web1.qcow2           /opt/vm/web1.qcow2
web2.qcow2           /opt/vm/web2.qcow2
[root@desktop vm]# virsh vol-info test1.qcow2 vm  # 查看存储池vm中的卷test1.qcow的信息
Name:           test1.qcow2
Type:           file
Capacity:       1.00 GiB
Allocation:     196.00 KiB
[root@desktop vm]# virsh vol-clone test1.qcow2 test1back.qcow2 vm # 在存储池中克隆卷test1.qcow2为卷test1back.qcow2
Vol test1back.qcow2 cloned from test1.qcow2
[root@desktop vm]# virsh vol-delete test1back.qcow2 vm  # 删除存储池中卷test1back.qcow2
Vol test1back.qcow2 deleted
[root@desktop vm]# virsh vol-dumpxml test1.qcow2 vm > test1.xml # 保存存储池中存储卷test1.qcow2的配置到test1.xml
[root@desktop vm]# virsh vol-delete test1.qcow2 vm
Vol test1.qcow2 deleted
[root@desktop vm]# virsh vol-create vm test1.xml  # 用配置文件test1.xml在存储池中生成一个卷
Vol test1.qcow2 created from test1.xml

- snapshot-create                                 使用 XML 生成快照
- snapshot-create-as                            使用一组参数生成快照
- snapshot-current                                获取或者设定当前快照
- snapshot-delete                                  删除域快照
- snapshot-dumpxml                             为域快照转储 XML
- snapshot-edit                                      编辑快照 XML
- snapshot-info                                     快照信息
- snapshot-list                                      为域列出快照
- snapshot-parent                                 获取快照的上级快照名称
- snapshot-revert                                  从快照恢复

[root@desktop ~]# virsh snapshot-list dns   # 列出虚拟机dns的快照
Name                 Creation Time             State
[root@desktop ~]# virsh snapshot-create-as --name dns-v1 --domain dns  # 为虚拟机生成快照dns-v1
Domain snapshot dns-v1 created
[root@desktop ~]# virsh snapshot-list dns
Name                 Creation Time             State
dns-v1               2022-03-16 09:52:22 +0800 running
[root@desktop ~]# virsh snapshot-revert --domain dns --snapshotname dns-v1  # 从快照恢复
[root@desktop ~]# virsh snapshot-current --domain dns  # 获取当前快照
<domainsnapshot>
<name>dns-v1</name>
<state>running</state>
<creationTime>1647395542</creationTime>
<memory snapshot='internal'/>
<disks>
<disk name='vda' snapshot='internal'/>
</disks>
...
</domainsnapshot>
[root@desktop ~]# virsh snapshot-info --domain dns --snapshotname dns-v1  # 输出指定的快照信息
Name:           dns-v1
Domain:         dns
Current:        yes
State:          running
Location:       internal
Parent:         -
Children:       0
Descendants:    0
Metadata:       yes
[root@desktop ~]# virsh snapshot-delete --domain dns --snapshotname dns-v1 # 删除快照
Domain snapshot dns-v1 deleted
[root@desktop ~]# virsh snapshot-list dns
Name                 Creation Time             State
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