Libvirt错误总结

此文放在evernote快发霉了，整理一下放出来。

?启动虚拟机错误：lzjun@lzjun-ubuntu:/opt/vm$ sudo virsh start vm0

error: Failed to start domain vm0
error: internal error process exited while connecting to monitor: Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
No accelerator found!

?

上面的提示信息就是因为QEMU在初始化阶段因为无法找到kvm内核模块。

sudo modprobe kvm ? #载入指定的模块

重启电脑，进入bios界面，设置advance选项里面的virtualization标签为Enabled

通过命令 lsmod | grep kvm ? ?#显示已载入的模块

?虚拟机迁移：# virsh migrate --live 1 qemu+tcp://192.168.0.121 --p2p --tunnelled --unsafe?

error: operation failed: Failed to connect to remote libvirt URI qemu+tcp://192.168.0.121（在URI后面加上/system，‘system’相当于root用户的访问权限)

#virsh migrate --live 2 qemu+tcp://192.168.0.121/system --p2p --tunnelled

?error: Unsafe migration: Migration may lead to data corruption if disks use cache != none（加上--unsafe参数）

#virsh migrate --live 2 qemu+tcp://192.168.0.121/system --p2p --tunnelled --unsafe?

error: Timed out during operation: cannot acquire state change lock (启动虚拟机有时也会遇此错误）,需要重启libvirtd进程

?#virsh

error: Failed to connect socket to '/var/run/libvirt/libvirt-sock':?Connection refused(libvirtd 进程没有启动，libvirtd是一个监听客户端请求的进程）

$ virsh -c qemu:///system list
error: Failed to connect socket to '/var/run/libvirt/libvirt-sock':?Permission denied
error: failed to connect to the hypervisor

（当前用户没有权限，修改/etc/libvirt/libvirtd.conf,unix_sock_rw_perms = 0777,使所有用户都有权限读写）

?

启动libvirtd进程出错：?/usr/local/sbin/libvirtd -d -l --config /usr/local/etc/libvirt/libvirtd.conf?（编译安装的启动方式）

error：/usr/local/sbin/libvirtd: initialization failed

try to install libpcap-devel RPM and rebuild libvirt ?http://comments.gmane.org/gmane.comp.emulators.libvirt/58218

apt-get?install?libpcap-dev

上面的方法好像都没有效果，但是尝试了http://wiki.libvirt.org/page/The_daemon_cannot_be_started说的，把配置文件里的

listen_tls = 0注释取消（更奇怪的问题，在我的客户端链接不对）

?

启动虚拟机：Connection reset by peer

virsh start vm1355991767186
error: Failed to start domain vm1355991767186
error: Unable to read from monitor: Connection reset by peer

?还有可能是这样提示：

error: internal error process exited while connecting to monitor: Failed to allocate 16332619776 B: Cannot allocate memory

这个问题可能是因为为VM分配的内存过大（甚至超过的物理主机的内存大小）

?

Unable to load library 'virt': libvirt.so: cannot open shared object file: No such file or directorylinux 环境：?????ln -s /usr/lib/libvirt.so.0 ? /usr/lib/libvirt.sowindows 环境?????将libvirt-0.dll改名为virt.dll??

# virsh undefine vm1354695894990
error: Refusing to undefine while domain managed save image exists

http://www.redhat.com/archives/libvir-list/2011-July/msg01219.html

?managedsave

解决办法：virsh undefine $domain??--managed-save?更多参考：http://wiki.libvirt.org/page/Failed_to_connect_to_the_hypervisorhttps://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.3_Technical_Notes/libvirt.htmlhttps://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/App_TCP_Ports.html???