error: internal error: cannot find character device <null> virsh console报

admin

virsh console 报错
& W$ V3 k2 ?& N/ @% qerror: internal error: cannot find character device <null>
Error "internal error cannot find character device" when trying to connect a domain's consoleSymptom% virsh console test2 Connected to domain test2 Escape character is ^] error: internal error cannot find character device (null)
7 p: U; r# Q' X1 o5 k4 u, C4 L( ~* mInvestigationThe error tells there is no serial console configured for the domain.SolutionSetup serial console in the domain's XML.1) Add the following XML in domain's XML (using "virsh edit") NOTE: It's necessary to write this in the <devices>-Section. <serial type='pty'>   <target port='0'/> </serial> <console type='pty'>   <target type='serial' port='0'/> </console>2) Setup console in guest kernel command line, you can login into the guest to edit /boot/grub/grub.conf directly, or using tool "virt-edit". Append following to the guest kernel command line: console=ttyS0,1152003) % virsh start vm --console

admin

解决办法：
通过virsh edit 修改xml文件，添加如下信息，即可：
0 K: f# m- F' ]4 ^+ p2 Z    <interface type='bridge'>
& B2 H* `% m4 K  U. T2 k      <mac address='52:54:00:af:49:04'/>
8 }5 K4 C6 L6 f. j, |      <source bridge='vpc-connection'/>
6 |' Y5 D' z& h; }; B( Y( w      <target dev='peer-175.73'/>
      <model type='virtio'/>
' a9 S" N: d8 p( ^      <driver name='qemu'/>
( h- r% [; o8 N$ A      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
/ |1 J! D6 m7 L$ e    </interface>
( w4 a, F, X; m( w6 Q: Q    <serial type='pty'>
      <target port='0'/>
+ z8 w5 |8 }9 M$ ^    </serial>
    <console type='pty'>
4 B3 f- F: W: Y, @2 W      <target type='serial' port='0'/>
3 Y& G0 L! }6 i! c  s    </console>
4 q) s1 [6 s& P. ]4 x" v' j    <channel type='spicevmc'>
      <target type='virtio' name='com.redhat.spice.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
修改完成后保存：
vi /etc/libvirt/qemu/xxx.xml文件的配置信息是否正确

9 i" A% Z9 A, [- x" C# K; _$ R3 ]
" z& y4 a; e  C6 y3 u, D: Y重启kvm虚机：
virsh destroy xxx
virsh start xxx

admin

解决办法：
- F9 z; }: {+ _3 C& I  Q通过virsh edit 修改xml文件，添加如下信息，即可：
: ?% k  l# p5 ]) E6 K" `8 c    <interface type='bridge'>
      <mac address='52:54:00:af:49:04'/>
      <source bridge='vpc-connection'/>
      <target dev='peer-175.73'/>
      <model type='virtio'/>
      <driver name='qemu'/>
( Y0 ?+ F  H  }3 B) W) m1 f      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
) V8 Q6 ^  A2 u- R1 e4 p    </interface>
& V- m/ ~2 [! i& k4 g6 a    <serial type='pty'>
      <target port='0'/>
6 ]. a4 K8 P" ~    </serial>
    <console type='pty'>
& Y+ ~# {2 e3 f: u' v: |4 z! f0 q, u3 e      <target type='serial' port='0'/>
, p) u) [# }7 w9 L& w) f    </console>
    <channel type='spicevmc'>
3 k% K$ \9 i: G! p# _: ^      <target type='virtio' name='com.redhat.spice.0'/>
. f# V6 a: W7 H" X      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
7 \, R. w# X+ t" V修改完成后保存：
( J, o3 k7 _) Z+ v# |( Vvi /etc/libvirt/qemu/xxx.xml文件的配置信息是否正确
3 E, Q/ u+ A6 z8 H5 }5 R" ]( A9 s3 M

重启kvm虚机：
virsh destroy xxx
9 a1 I- }* T+ Q& ^4 F7 D) p( v) H) Tvirsh start xxx

admin

解决办法：
通过virsh edit 修改xml文件，添加如下信息，即可：
    <interface type='bridge'>
      <mac address='52:54:00:af:49:04'/>
6 l/ S! H  `3 f' ]4 k6 ^! V( Q2 Y3 g      <source bridge='vpc-connection'/>
      <target dev='peer-175.73'/>
$ N" ^  Q% `: K; n; F      <model type='virtio'/>
! i' ]6 t: `( l      <driver name='qemu'/>
$ b# D' W) i9 B1 w+ Y      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
; [& m& d5 P% g; a    </interface>
* B! l) D2 }. N5 j" a8 X7 }# b! n    <serial type='pty'>
) C8 @% D$ ]( j. A3 d      <target port='0'/>
    </serial>
) C6 f- N$ O8 }    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
  c  h8 p7 @% m2 Q, z) j3 s    <channel type='spicevmc'>
7 o& c+ y$ \. i- g5 G      <target type='virtio' name='com.redhat.spice.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
3 I' e. c( v8 F& Y$ z修改完成后保存：
5 K/ h( l7 y/ S" Y2 R6 Dvi /etc/libvirt/qemu/xxx.xml文件的配置信息是否正确


& O+ u8 @: @% }# r7 q2 k4 W重启kvm虚机：
& N& E0 m, S9 Qvirsh destroy xxx
, z- E: G1 F* a0 ^, qvirsh start xxx
. G. _: |$ C/ G4 f