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
# }( X( f5 \: `* Kvirsh domblklist Windows2019_x86
Target   Source
% U$ z/ Y' s  q, ?----------------------------------------------------------------
vda      /usr/src/Windows2019-x86.qcow2
( k# I( v- _8 E6 M7 Z- L* z sda      /usr/src/cn_windows_server_2019_x64_dvd_2d80e042.iso
$ B3 B& `8 b; F9 R% T7 t  Q
- P0 g( \6 y* g. N5 N
1 q8 K  v5 P; U3 t7 q0 l4 L( ~0 r
. z9 A% ^6 x! p; ~/ Svirsh attach-disk  Windows2019_x86 --target sdb   --type cdrom  /usr/src/virtio-win-0.1.225.iso  --mode readonly  
error: Failed to attach disk
error: Operation not supported: cdrom/floppy device hotplug isn't supported



( d) S* i' w4 P! p. N% J8 H, }2 Vroot@compute01:/usr/src# virsh attach-disk  Windows2019_x86 /usr/src/virtio-win-0.1.225.iso sdb --cache none --subdriver cdrom --config --persistent
error: 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
2 B+ O' w/ Z4 O, L2 x
root@compute01:/usr/src# virsh attach-disk  Windows2019_x86 /usr/src/virtio-win-0.1.225.iso vdc --cache none --subdriver qcow2 --config --persistent
error: Failed to attach disk
error: internal error: unable to execute QEMU command 'blockdev-add': Image is not in qcow2 format

8 Z: M% e+ J* w- j0 K3 zroot@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
$ a. |! G- A& G3 o  S& x7 i; C+ I
2 D1 F$ K  t* L! T* E
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4 H6 n) [) t& A2 Oroot@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

8 Q; m( a" n3 \+ t1 KStarting 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
otherwise, please restart your installation.
* u1 O) v; y0 d, J# Zroot@compute01:/usr/src#
root@compute01:/usr/src#
root@compute01:/usr/src# netplan apply

+ F+ j& J  d+ H4 d% T0 Q0 @& D** (generate:8799): WARNING **: 13:35:59.651: `gateway4` has been deprecated, use default routes instead.
See the 'Default routes' section of the documentation for more details.

** (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.
, o4 W; d; J6 V' V0 ^# n
** (process:8797): WARNING **: 13:36:01.052: `gateway4` has been deprecated, use default routes instead.
See 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.
4 M- x% Z& m; v" x3 bSee 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.
See the 'Default routes' section of the documentation for more details.
# c/ i& S) I$ d1 ^& Kroot@compute01:/usr/src#
root@compute01:/usr/src#
9 h# x. {* f( _: {1 Hroot@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

/ d. A% r* }/ b$ jStarting install...
8 p9 m- v) [4 f/ o- ~+ P% SCreating domain...                                          |    0 B  00:00:00     
8 k3 r/ k3 s) {# p" {$ p
$ |4 X  k2 M0 i2 ~5 GDomain is still running. Installation may be in progress.
You can reconnect to the console to complete the installation process.
root@compute01:/usr/src#
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7 J: W. H8 ?  t8 ~* k0 h在线添加光盘
virsh attach-disk Windows2019_x86 /usr/src/virtio-win-0.1.225.iso/ vdd
# m, O$ s& G9 U- h
; J( y. B* e7 w& ]" l: K其他方法：
! @8 C- i! T8 e: {9 C

再次使用 virsh dumpxml sles12-sp3 可以看到iso文件加载:

+ V9 g! e# z; I4 R0 c* N7 \<disk type='file' device='cdrom'>
2 U9 o; m6 V2 u/ u, F  <driver name='qemu' type='raw'/>
  <source file='/var/lib/libvirt/images/SLE-12-SP3-Server-DVD-x86_64-GM-DVD1.iso' index='3'/>
! V% l! b& g. ^- u# m# Z/ l# w  <backingStore/>
. a2 Y$ `. J% T, c  <target dev='sda' bus='sata'/>
1 c& G- Q" @# f8 m4 b  <readonly/>
7 n6 x. w: d0 Y  }  <alias name='sata0-0-0'/>
  <address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
' m' \: J. \; x( Y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:

<disk type='file' device='cdrom'>
  <driver name='qemu' type='raw'/>
  <backingStore/>
  <target dev='sda' bus='sata'/>
  <readonly/>
  Q9 r0 ^$ t& w7 y  <alias name='sata0-0-0'/>
  <address type='drive' controller='0' bus='0' target='0' unit='0'/>
$ S7 o. y* K) }  d& s6 L7 Z, W: o</disk>
然后执行设备更新:

. y# B4 Z+ x. a0 S5 S' fvirsh update-device sles12-sp3 detach_iso.xml
$ H& D" t- L1 y. c此时提示:
$ z' F& _7 h, D! p$ n
Device updated successfully
再检查虚拟机配置，就看到iso文件已经卸载了。

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。

# y/ e; S# C6 p/ a6 {. bvirsh domblklist Windows2019_x86
Target   Source
) F/ G5 r' l) h9 B1 E+ @/ D1 k; s! K----------------------------------------------------------------
vda      /usr/src/Windows2019-x86.qcow2
/ T7 G% }8 z& V- Z 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
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#调整为2G
/ U: A5 W4 `* U  i% U7 y- ^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


3.在线调整虚拟机CPU(只能增大，不能减小)
virsh setvcpus cos_v1 4
9 M+ ?' k# h3 q" h) Cvirsh setvcpus cos_v1 8
#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


* ~6 u0 |3 |, _4.在线添加硬盘
#添加qcow2格式硬盘

#创建qcow2格式的新磁盘,大小为40G
/ M+ }3 x6 m. I& H, gqemu-img create -f qcow2 /data/vhosts/test/cos_v1-add1.disk 40G
* R& T0 i# w$ L* P: gvirsh attach-disk cos_v1 /data/vhosts/test/cos_v1-add1.disk vdb --cache none --subdriver qcow2 --config --persistent
#虚拟机根磁盘为vda，因此这里使用vdb表示新添加磁盘
% u/ |# z& L& b2 l  k$ k#--config 参数同时更新虚拟机xml文件，确保重启后依然生效
#添加raw格式硬盘
7 d7 n4 I5 O, O( t- A  b5 S2 p#创建raw格式的新磁盘,大小为40G
qemu-img create -f raw /data/vhosts/test/cos_v1-add2.disk 40G
virsh attach-disk lnmptest-107 /data/vhosts/test/cos_v1-add2.disk vdc --cache none --subdriver raw --config --persistent

5.在线移除硬盘
) f! e; F4 E* _; f#可以查看虚拟机所有磁盘
virsh domblklist cos_v1
virsh detach-disk cos_v1 vdb

6.在线添加网卡
; P1 m0 l+ G$ cvirsh attach-interface --domain cos_v1 --type network --source default --model virtio --config
% h2 I' E( w' C* z1 v! x#可以查看新添加的网卡
& I% a+ ]3 o2 d' d0 O( yvirsh domiflist cos_v1

  F) C7 N, Y1 l! `0 S$ c1 W7.在线添加光盘
) P' ^$ y9 j& e6 Y, g5 _virsh attach-disk centosbase /data_lij/iso/CentOS-6.4-x86_64-bin-DVD1.iso vdd