virsh 在线添加设备cdrom或者iso镜像

admin

virsh 在线添加设备cdrom或者iso镜像
$ {* B+ L+ Q  rvirsh domblklist Windows2019_x86
Target   Source
----------------------------------------------------------------
. @" w/ h% F  R, {( K3 Y# N vda      /usr/src/Windows2019-x86.qcow2
sda      /usr/src/cn_windows_server_2019_x64_dvd_2d80e042.iso

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virsh attach-disk  Windows2019_x86 --target sdb   --type cdrom  /usr/src/virtio-win-0.1.225.iso  --mode readonly  
6 ~; r  z( y' D/ p, Y' N3 _; Oerror: Failed to attach disk
% M3 f2 }8 Y- X* t2 G, s  \error: Operation not supported: cdrom/floppy device hotplug isn't supported
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+ |% i$ X7 h& q; `% m0 P7 |root@compute01:/usr/src# virsh attach-disk  Windows2019_x86 /usr/src/virtio-win-0.1.225.iso sdb --cache none --subdriver cdrom --config --persistent
5 }5 F1 ?& m2 x+ O7 eerror: Failed to attach disk
error: unsupported configuration: unknown driver format value 'cdrom'

root@compute01:/usr/src# virsh attach-disk  Windows2019_x86 /usr/src/virtio-win-0.1.225.iso sdb --cache none --subdriver qcow2 --config --persistent
error: Failed to attach disk
error: internal error: No more available PCI slots

# p- Q% r3 ~/ r5 H" p2 Qroot@compute01:/usr/src# virsh attach-disk  Windows2019_x86 /usr/src/virtio-win-0.1.225.iso vdc --cache none --subdriver qcow2 --config --persistent
7 ?% d! A4 X% M) P7 q) M' v  D2 werror: Failed to attach disk
1 J: A, o0 N3 C6 perror: internal error: unable to execute QEMU command 'blockdev-add': Image is not in qcow2 format

root@compute01:/usr/src# virsh attach-disk  Windows2019_x86 /usr/src/virtio-win-0.1.225.iso vdc --cache none --subdriver raw --config --persistent
Disk attached successfully

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root@compute01:/usr/src# virt-install --name=Windows2019_x86  --ram 8192 --vcpus=4 --disk path=/usr/src/Windows2019-x86.qcow2,format=qcow2,size=15,bus=virtio --accelerate --cdrom /usr/src/cn_windows_server_2019_x64_dvd_2d80e042.iso --vnc --vncport=5906 --vnclisten=0.0.0.0 --network bridge=br0,model=virtio --noautoconsole --disk path=/usr/src/virtio-win-0.1.225.iso,device=cdrom

Starting install...
ERROR    Cannot get interface MTU on 'br0': No such device
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///system start Windows2019_x86
3 U: P4 g( s4 q# kotherwise, please restart your installation.
4 Y7 T8 f$ }" rroot@compute01:/usr/src#
; r+ i' J8 U# y3 x5 c/ Aroot@compute01:/usr/src#
* \0 e* [+ P. S; \# Mroot@compute01:/usr/src# netplan apply
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7 O! v& f! y1 _: V! z7 f, t: X** (generate:8799): WARNING **: 13:35:59.651: `gateway4` has been deprecated, use default routes instead.
, `7 Q5 z9 U* ]2 \! w1 uSee the 'Default routes' section of the documentation for more details.
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** (process:8797): WARNING **: 13:36:01.040: `gateway4` has been deprecated, use default routes instead.
See the 'Default routes' section of the documentation for more details.
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** (process:8797): WARNING **: 13:36:01.052: `gateway4` has been deprecated, use default routes instead.
% Z, J2 y% y! {( Z4 {- CSee the 'Default routes' section of the documentation for more details.

** (process:8797): WARNING **: 13:36:01.589: `gateway4` has been deprecated, use default routes instead.
8 u* l, ~; W2 f' Z+ JSee the 'Default routes' section of the documentation for more details.
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5 k- }5 x+ n1 ?+ x** (process:8797): WARNING **: 13:36:01.589: `gateway4` has been deprecated, use default routes instead.
See the 'Default routes' section of the documentation for more details.
/ h% q# k$ w9 n2 H, A4 P7 Broot@compute01:/usr/src#
( s' l0 k5 {7 x  M& Troot@compute01:/usr/src#
root@compute01:/usr/src# virt-install --name=Windows2019_x86  --ram 8192 --vcpus=4 --disk path=/usr/src/Windows2019-x86.qcow2,format=qcow2,size=15,bus=virtio --accelerate --cdrom /usr/src/cn_windows_server_2019_x64_dvd_2d80e042.iso --vnc --vncport=5906 --vnclisten=0.0.0.0 --network bridge=br0,model=virtio --noautoconsole --disk path=/usr/src/virtio-win-0.1.225.iso,device=cdrom

Starting install...
Creating domain...                                          |    0 B  00:00:00     
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Domain is still running. Installation may be in progress.
You can reconnect to the console to complete the installation process.
+ r/ l$ }( Y. ~7 eroot@compute01:/usr/src#
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在线添加光盘
virsh attach-disk Windows2019_x86 /usr/src/virtio-win-0.1.225.iso/ vdd

其他方法：
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再次使用 virsh dumpxml sles12-sp3 可以看到iso文件加载:
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<disk type='file' device='cdrom'>
  <driver name='qemu' type='raw'/>
  <source file='/var/lib/libvirt/images/SLE-12-SP3-Server-DVD-x86_64-GM-DVD1.iso' index='3'/>
, _  i( A# }2 `' n, ?  <backingStore/>
  <target dev='sda' bus='sata'/>
0 T$ k" i8 a3 @3 B6 e  <readonly/>
  <alias name='sata0-0-0'/>
  <address type='drive' controller='0' bus='0' target='0' unit='0'/>
( n; Y) ?4 h& h</disk>
( m! |' _: D3 D1 N9 {( F- |如果要卸载这个iso文件，则创建一个相同结构的xml文件 detach_iso.xml ，但是保持 <source/> 行删除:

: M* V& n; K6 h<disk type='file' device='cdrom'>
  <driver name='qemu' type='raw'/>
; o) q+ A/ j# v+ e3 j  <backingStore/>
8 Y, B9 X; T4 O  <target dev='sda' bus='sata'/>
  <readonly/>
' A( M7 u5 @/ u  <alias name='sata0-0-0'/>
+ \! N) E. B6 t  <address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
! _1 e+ b( o9 h' [) T3 q然后执行设备更新:

virsh update-device sles12-sp3 detach_iso.xml
此时提示:

  i6 a0 w: h# ?! y! {+ n4 m0 ]4 ^Device updated successfully
再检查虚拟机配置，就看到iso文件已经卸载了。
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admin

virt-install --name=Windows2019_x86  --ram 8192 --vcpus=4 --disk path=/usr/src/Windows2019-x86.qcow2,format=qcow2,size=15,bus=virtio --accelerate --cdrom /usr/src/cn_windows_server_2019_x64_dvd_2d80e042.iso --vnc --vncport=5906 --vnclisten=0.0.0.0 --network bridge=br0,model=virtio --noautoconsole --disk path=/usr/src/virtio-win-0.1.225.iso,device=cdrom  创建kvm时，添加对应的多个设备即可。

# |9 |1 ~3 P2 [" P4 F. v- Cvirsh domblklist Windows2019_x86
Target   Source
----------------------------------------------------------------
vda      /usr/src/Windows2019-x86.qcow2
sda      /usr/src/cn_windows_server_2019_x64_dvd_2d80e042.iso
sdb      /usr/src/virtio-win-0.1.225.iso

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admin

2.在线调整虚拟机内存(增大或减小)
#调整为4G
virsh setmem cos_v1 4G

( Y2 |! s; t  {$ ^6 N) n#调整为2G
virsh setmem cos_v1 2G
#能够在线调整的最大内存不能超过为虚拟机分配的最大内存（上面xml文件中设置的最大为4G），否则需要关闭虚拟机上调最大内存
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3.在线调整虚拟机CPU(只能增大，不能减小)
virsh setvcpus cos_v1 4
, u$ u! U' }( m  v1 l7 N) b5 A( svirsh setvcpus cos_v1 8
/ M/ o8 w4 V9 K. C! \#同样，能够动态调整的最大VCPU个数也不能超过为虚拟机设置的最大VCPU数量


4.在线添加硬盘
#添加qcow2格式硬盘
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! K! g/ o7 Y9 G#创建qcow2格式的新磁盘,大小为40G
" w# n2 V  t/ z5 mqemu-img create -f qcow2 /data/vhosts/test/cos_v1-add1.disk 40G
, |5 X% f' g; X/ d$ Nvirsh attach-disk cos_v1 /data/vhosts/test/cos_v1-add1.disk vdb --cache none --subdriver qcow2 --config --persistent
7 |& n. _% X) H7 N# n' R#虚拟机根磁盘为vda，因此这里使用vdb表示新添加磁盘
- ]! c' B9 X5 ?) d9 |. v#--config 参数同时更新虚拟机xml文件，确保重启后依然生效
/ Z6 Q/ \& ~5 k; |% w#添加raw格式硬盘
: K" d% J0 e) E! R3 X#创建raw格式的新磁盘,大小为40G
. U1 ?% B2 @6 C, I4 q* w$ a( L0 Xqemu-img create -f raw /data/vhosts/test/cos_v1-add2.disk 40G
8 E$ `1 u! L7 g0 y8 K, hvirsh attach-disk lnmptest-107 /data/vhosts/test/cos_v1-add2.disk vdc --cache none --subdriver raw --config --persistent
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5.在线移除硬盘
6 K7 t' e( p3 t& q4 o#可以查看虚拟机所有磁盘
' O6 D" r- V' }" B" p$ K0 nvirsh domblklist cos_v1
virsh detach-disk cos_v1 vdb
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) {# P2 t" a. W6 T3 V0 J6.在线添加网卡
virsh attach-interface --domain cos_v1 --type network --source default --model virtio --config
0 H  G/ r% E3 R  i. i#可以查看新添加的网卡
virsh domiflist cos_v1

% S& R4 K% M: j$ ?6 _9 {- X7.在线添加光盘
4 _8 `0 R2 C$ \; L  I3 L2 E2 nvirsh attach-disk centosbase /data_lij/iso/CentOS-6.4-x86_64-bin-DVD1.iso vdd