libvirt錯誤總結

virsh start vm1368544020451:

 error: Failed to start domain vm1368544020451

error: internal error process exited while connecting to monitor: kvm: -drive file=/dev/sp1368155439693/v1368544020461,if=none,id=drive-virtio-disk0,format=qcow2: could not open disk image /dev/sp1368155439693/v1368544020461: Invalid argument

鏡像格式錯誤，用qemu-img info 檢查鏡像和xml配置文件中指定的type是否一致。

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爲QEMU在初始化階段因爲無法找到kvm內核模塊。

sudo modprobe kvm   #載入指定的模塊

重啓電腦，進入bios界面，設置advance選項裏面的virtualization標籤爲Enabled

通過命令 lsmod | grep kvm    #顯示已載入的模塊

 虛擬機遷移：

# 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後面加上/system，‘system’相當於root用戶的訪問權限)

#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參數）

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

error: Timed out during operation: cannot acquire state change lock (啓動虛擬機有時也會遇此錯誤）,需要重啓libvirtd進程

virsh：

error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Connection refused(libvirtd 進程沒有啓動，libvirtd是一個監聽客戶端請求的進程）

$ 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

（當前用戶沒有權限，修改/etc/libvirt/libvirtd.conf,unix_sock_rw_perms = 0777,使所有用戶都有權限讀寫）

啓動libvirtd進程出錯：

 /usr/local/sbin/libvirtd -d -l --config /usr/local/etc/libvirt/libvirtd.conf （編譯安裝的啓動方式）

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

上面的方法好像都沒有效果，但是嘗試了http://wiki.libvirt.org/page/The_daemon_cannot_be_started說的，把配置文件裏的

listen_tls = 0註釋取消（更奇怪的問題，在我的客戶端鏈接不對）

啓動虛擬機：Connection reset by peer

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

 還有可能是這樣提示：

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

這個問題可能是因爲爲VM分配的內存過大（甚至超過的物理主機的內存大小）

Unable to load library 'virt': libvirt.so: cannot open shared object file: No such file or directory

linux 環境：

     ln -s /usr/lib/libvirt.so.0   /usr/lib/libvirt.so

windows 環境

     將libvirt-0.dll改名爲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

解決辦法：virsh undefine $domain  --managed-save

 

在centos下面Define虛擬機時，確實沒有/usr/bin/kvm，加軟鏈接

error: Failed to define domain from xxx.xml

error: Cannot find QEMU binary /usr/bin/kvm: No such file or directory

解決辦法：ln -s /usr/libexec/qemu-kvm /usr/bin/kvm

更多參考：

http://wiki.libvirt.org/page/Failed_to_connect_to_the_hypervisor

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.3_Technical_Notes/libvirt.html

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/App_TCP_Ports.html