Linux 虚拟机之--KVM的安装和配置（一）

Linux 虚拟机之--KVM的安装和配置（一）

系统环境：

     操作系统： RedHat EL6.4(x86_64)

一、前言

     KVM，即Kernel-based Virtual Machine的简称，是一个开源的系统虚拟化模块，自Linux 2.6.20之后集成在Linux的各个主要发行版本中。它使用Linux自身的调度器进行管理，所以相对于Xen，其核心源码很少。KVM目前已成为学术界的主流VMM之一。KVM的虚拟化需要硬件支持（如Intel VT技术或者AMD V技术)。是基于硬件的完全虚拟化。而Xen早期则是基于软件模拟的Para-Virtualization，

       新版本则是基于硬件支持的完全虚拟化。但Xen本身有自己的进程调度器，存储管理模块等，所以代码较为庞大。广为流传的商业系统虚拟化软件VMware ESX系列也是基于软件模拟的Para-Virtualization。

二、配置环境

软件包组：

virtualization            提供虚拟机的环境，主要包含qemu-kvm

virtualization-client      管理和安装虚拟机实例的客户端，主要有python-virtinst,virt-manager,virt-viewer

virtualization-platform    提供访问和控制虚拟客户端的接口，主要有libvirt，libvirt-client

virtualization-tools      管理离线虚拟机镜像的工具，主要有libguestfs

根据需求选择软件包，一般都安装前三个，也可以只安装个别主要的包。

为了减少不必要的麻烦，请关闭防火墙和SELinux

# cat /proc/cpuinfo |grep flags    需要全虚拟化支持为vmx(Inter)或svm（AMD）

三、安装KVM软件包

1、查看主机CPU信息

[root@rh64 ~]# cat /proc/cpuinfo|grep flag
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc up rep_good xtopology nonstop_tsc unfair_spinlock pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 popcnt aes xsave avx hypervisor lahf_lm

2、查看系统内核版本

[root@rh64 ~]# uname -a
Linux rh64 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64 GNU/Linux

3、通过系统安装盘安装kvm软件包
[root@rh64 ~]# mount /dev/sr0 /media
mount: block device /dev/sr0 is write-protected, mounting read-only
[root@rh64 ~]# yum groupinstall "Virtualization" "Virtualization Client" "Virtualzation Platform"

Loaded plugins: product-id, refresh-packagekit, security, subscription-managerThis system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.base                                                                                       | 3.9 kB     00:00 ... Setting up Group Processbase/group_gz                                                                              | 204 kB     00:00 ... Warning: Group Virtualzation Platform does not exist.Resolving Dependencies--> Running transaction check---> Package hypervkvpd.x86_64 0:0-0.9.el6 will be installed---> Package python-virtinst.noarch 0:0.600.0-15.el6 will be installed--> Processing Dependency: libvirt-python >= 0.2.0 for package: python-virtinst-0.600.0-15.el6.noarch---> Package qemu-kvm.x86_64 2:0.12.1.2-2.355.el6 will be installedbase/filelists_db                                                                          | 3.7 MB     00:00 ... --> Processing Dependency: qemu-img = 2:0.12.1.2-2.355.el6 for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: seabios >= 0.6.1.2-20.el6 for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: vgabios-vmware for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: vgabios-stdvga for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: vgabios-qxl for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: vgabios for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.8.3)(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.8.2)(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.8.1)(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.6.0)(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.11.2)(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.10.4)(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: /usr/share/sgabios/sgabios.bin for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: /usr/share/gpxe/virtio-net.rom for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: /usr/share/gpxe/rtl8139.rom for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: /usr/share/gpxe/rtl8029.rom for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: /usr/share/gpxe/pcnet32.rom for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: /usr/share/gpxe/e1000-0x100e.rom for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libusbredirparser.so.1()(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64--> Processing Dependency: libspice-server.so.1()(64bit) for package: 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64---> Package virt-manager.x86_64 0:0.9.0-18.el6 will be installed--> Processing Dependency: gtk-vnc-python >= 0.3.8 for package: virt-manager-0.9.0-18.el6.x86_64--> Processing Dependency: gnome-python2-gnomekeyring >= 2.15.4 for package: virt-manager-0.9.0-18.el6.x86_64--> Processing Dependency: spice-gtk-python for package: virt-manager-0.9.0-18.el6.x86_64---> Package virt-top.x86_64 0:1.0.4-3.15.el6 will be installed---> Package virt-viewer.x86_64 0:0.5.2-18.el6 will be installed--> Processing Dependency: libspice-client-gtk-2.0.so.4(SPICEGTK_1)(64bit) for package: virt-viewer-0.5.2-18.el6.x86_64--> Processing Dependency: libspice-client-glib-2.0.so.8(SPICEGTK_1)(64bit) for package: virt-viewer-0.5.2-18.el6.x86_64--> Processing Dependency: libspice-controller.so.0()(64bit) for package: virt-viewer-0.5.2-18.el6.x86_64--> Processing Dependency: libspice-client-gtk-2.0.so.4()(64bit) for package: virt-viewer-0.5.2-18.el6.x86_64--> Processing Dependency: libspice-client-glib-2.0.so.8()(64bit) for package: virt-viewer-0.5.2-18.el6.x86_64--> Processing Dependency: libgtk-vnc-1.0.so.0()(64bit) for package: virt-viewer-0.5.2-18.el6.x86_64--> Running transaction check---> Package gnome-python2-gnomekeyring.x86_64 0:2.28.0-4.el6 will be installed---> Package gpxe-roms-qemu.noarch 0:0.9.7-6.9.el6 will be installed---> Package gtk-vnc.x86_64 0:0.3.10-3.el6 will be installed---> Package gtk-vnc-python.x86_64 0:0.3.10-3.el6 will be installed---> Package libvirt-python.x86_64 0:0.10.2-18.el6 will be installed---> Package qemu-img.x86_64 2:0.12.1.2-2.355.el6 will be installed---> Package seabios.x86_64 0:0.6.1.2-26.el6 will be installed---> Package sgabios-bin.noarch 0:0-0.3.20110621svn.el6 will be installed---> Package spice-glib.x86_64 0:0.14-7.el6 will be installed--> Processing Dependency: libcelt051.so.0()(64bit) for package: spice-glib-0.14-7.el6.x86_64--> Processing Dependency: libcacard.so.0()(64bit) for package: spice-glib-0.14-7.el6.x86_64---> Package spice-gtk.x86_64 0:0.14-7.el6 will be installed---> Package spice-gtk-python.x86_64 0:0.14-7.el6 will be installed---> Package spice-server.x86_64 0:0.12.0-12.el6 will be installed---> Package usbredir.x86_64 0:0.5.1-1.el6 will be installed---> Package vgabios.noarch 0:0.6b-3.7.el6 will be installed--> Running transaction check---> Package celt051.x86_64 0:0.5.1.3-0.el6 will be installed---> Package libcacard.x86_64 0:0.15.0-2.el6 will be installed--> Finished Dependency ResolutionDependencies Resolved=================================================================================================== Package                               Arch              Version                            Repository       Size===================================================================================================Installing: hypervkvpd                            x86_64            0-0.9.el6                          base             17 k python-virtinst                       noarch            0.600.0-15.el6                     base            490 k qemu-kvm                              x86_64            2:0.12.1.2-2.355.el6               base            1.3 M virt-manager                          x86_64            0.9.0-18.el6                       base            1.0 M virt-top                              x86_64            1.0.4-3.15.el6                     base            368 k virt-viewer                           x86_64            0.5.2-18.el6                       base            200 kInstalling for dependencies: celt051                               x86_64            0.5.1.3-0.el6                      base             50 k gnome-python2-gnomekeyring            x86_64            2.28.0-4.el6                       base             24 k gpxe-roms-qemu                        noarch            0.9.7-6.9.el6                      base            219 k gtk-vnc                               x86_64            0.3.10-3.el6                       base             95 k gtk-vnc-python                        x86_64            0.3.10-3.el6                       base             17 k libcacard                             x86_64            0.15.0-2.el6                       base             41 k libvirt-python                        x86_64            0.10.2-18.el6                      base            457 k qemu-img                              x86_64            2:0.12.1.2-2.355.el6               base            469 k seabios                               x86_64            0.6.1.2-26.el6                     base             91 k sgabios-bin                           noarch            0-0.3.20110621svn.el6              base            6.6 k spice-glib                            x86_64            0.14-7.el6                         base            291 k spice-gtk                             x86_64            0.14-7.el6                         base             54 k spice-gtk-python                      x86_64            0.14-7.el6                         base             22 k spice-server                          x86_64            0.12.0-12.el6                      base            326 k usbredir                              x86_64            0.5.1-1.el6                        base             40 k vgabios                               noarch            0.6b-3.7.el6                       base             42 kTransaction Summary===================================================================================================Install      22 Package(s)Total download size: 5.6 MInstalled size: 19 MIs this ok [y/N]: Downloading Packages:------------------------------------------------------------------------------------------------------------------Total                                                                              10 MB/s | 5.6 MB     00:00     Running rpm_check_debugRunning Transaction TestTransaction Test SucceededRunning TransactionWarning: RPMDB altered outside of yum.** Found 1 pre-existing rpmdb problem(s), 'yum check' output follows:openssl-1.0.1e-42.el6.x86_64 is a duplicate with openssl-1.0.0-27.el6.x86_64  Installing : usbredir-0.5.1-1.el6.x86_64                                                                   1/22   Installing : celt051-0.5.1.3-0.el6.x86_64                                                                  2/22   Installing : libcacard-0.15.0-2.el6.x86_64                                                                 3/22   Installing : spice-glib-0.14-7.el6.x86_64                                                                  4/22   Installing : spice-gtk-0.14-7.el6.x86_64                                                                   5/22   Installing : gtk-vnc-0.3.10-3.el6.x86_64                                                                   6/22   Installing : libvirt-python-0.10.2-18.el6.x86_64                                                           7/22   Installing : python-virtinst-0.600.0-15.el6.noarch                                                         8/22   Installing : gtk-vnc-python-0.3.10-3.el6.x86_64                                                            9/22   Installing : spice-gtk-python-0.14-7.el6.x86_64                                                           10/22   Installing : spice-server-0.12.0-12.el6.x86_64                                                            11/22   Installing : 2:qemu-img-0.12.1.2-2.355.el6.x86_64                                                         12/22   Installing : seabios-0.6.1.2-26.el6.x86_64                                                                13/22   Installing : gpxe-roms-qemu-0.9.7-6.9.el6.noarch                                                          14/22   Installing : sgabios-bin-0-0.3.20110621svn.el6.noarch                                                     15/22   Installing : vgabios-0.6b-3.7.el6.noarch                                                                  16/22   Installing : gnome-python2-gnomekeyring-2.28.0-4.el6.x86_64                                               17/22   Installing : virt-manager-0.9.0-18.el6.x86_64                                                             18/22   Installing : 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64                                                         19/22   Installing : virt-viewer-0.5.2-18.el6.x86_64                                                              20/22   Installing : hypervkvpd-0-0.9.el6.x86_64                                                                  21/22   Installing : virt-top-1.0.4-3.15.el6.x86_64                                                               22/22   Verifying  : gnome-python2-gnomekeyring-2.28.0-4.el6.x86_64                                                1/22   Verifying  : spice-glib-0.14-7.el6.x86_64                                                                  2/22   Verifying  : virt-top-1.0.4-3.15.el6.x86_64                                                                3/22   Verifying  : vgabios-0.6b-3.7.el6.noarch                                                                   4/22   Verifying  : 2:qemu-img-0.12.1.2-2.355.el6.x86_64                                                          5/22   Verifying  : sgabios-bin-0-0.3.20110621svn.el6.noarch                                                      6/22   Verifying  : spice-gtk-0.14-7.el6.x86_64                                                                   7/22   Verifying  : celt051-0.5.1.3-0.el6.x86_64                                                                  8/22   Verifying  : usbredir-0.5.1-1.el6.x86_64                                                                   9/22   Verifying  : hypervkvpd-0-0.9.el6.x86_64                                                                  10/22   Verifying  : gpxe-roms-qemu-0.9.7-6.9.el6.noarch                                                          11/22   Verifying  : libvirt-python-0.10.2-18.el6.x86_64                                                          12/22   Verifying  : spice-server-0.12.0-12.el6.x86_64                                                            13/22   Verifying  : virt-viewer-0.5.2-18.el6.x86_64                                                              14/22   Verifying  : virt-manager-0.9.0-18.el6.x86_64                                                             15/22   Verifying  : libcacard-0.15.0-2.el6.x86_64                                                                16/22   Verifying  : python-virtinst-0.600.0-15.el6.noarch                                                        17/22   Verifying  : seabios-0.6.1.2-26.el6.x86_64                                                                18/22   Verifying  : gtk-vnc-python-0.3.10-3.el6.x86_64                                                           19/22   Verifying  : gtk-vnc-0.3.10-3.el6.x86_64                                                                  20/22   Verifying  : 2:qemu-kvm-0.12.1.2-2.355.el6.x86_64                                                         21/22   Verifying  : spice-gtk-python-0.14-7.el6.x86_64                                                           22/22 Installed:  hypervkvpd.x86_64 0:0-0.9.el6      python-virtinst.noarch 0:0.600.0-15.el6 qemu-kvm.x86_64 2:0.12.1.2-2.355.el6  virt-manager.x86_64 0:0.9.0-18.el6 virt-top.x86_64 0:1.0.4-3.15.el6        virt-viewer.x86_64 0:0.5.2-18.el6   Dependency Installed:  celt051.x86_64 0:0.5.1.3-0.el6                     gnome-python2-gnomekeyring.x86_64 0:2.28.0-4.el6               gpxe-roms-qemu.noarch 0:0.9.7-6.9.el6              gtk-vnc.x86_64 0:0.3.10-3.el6                                  gtk-vnc-python.x86_64 0:0.3.10-3.el6               libcacard.x86_64 0:0.15.0-2.el6                                libvirt-python.x86_64 0:0.10.2-18.el6              qemu-img.x86_64 2:0.12.1.2-2.355.el6                           seabios.x86_64 0:0.6.1.2-26.el6                    sgabios-bin.noarch 0:0-0.3.20110621svn.el6                     spice-glib.x86_64 0:0.14-7.el6                     spice-gtk.x86_64 0:0.14-7.el6                                  spice-gtk-python.x86_64 0:0.14-7.el6               spice-server.x86_64 0:0.12.0-12.el6                            usbredir.x86_64 0:0.5.1-1.el6                      vgabios.noarch 0:0.6b-3.7.el6   

<span style="color: rgb(51, 51, 51); font-family: tahoma, 宋体; line-height: 22.4px; text-align: justify; background-color: rgb(250, 250, 252);">Complete!</span><span style="font-family: tahoma, 宋体; line-height: 22.4px; background-color: rgb(250, 250, 252);">  </span><span style="font-family: tahoma, 宋体; line-height: 22.4px; background-color: rgb(250, 250, 252);">                      </span>

四、配置KVM建立虚拟机

[root@rh64 u02]# mkdir /u02/data               //建立虚拟机存储空间

通过VNC连接主机，进行配置：

1、vnc连接

2、配置KVM

2、KVM安装包

4、提示启动“libvirt service”

[root@rh64 ~]# service libvirtd restart
Stopping libvirtd daemon: [FAILED]
Starting libvirtd daemon: [  OK  ]

5、KVM虚拟机summary

6、建立虚拟机

7、选择虚拟机的操作系统和安装ISO

8、配置虚拟机Memory和CPU

9、设置虚拟机的Storage

10、虚拟机配置信息汇总

[root@rh64 ~]# service libvirtd status
libvirtd (pid  3163) is running...
查看建立的虚拟机的存储信息：
[root@rh64 ~]# cd /u02/data
[root@rh64 data]# ls
rh6.img
[root@rh64 data]# pwd
/u02/data
[root@rh64 data]# ls -l
total 8396812
-rwxr-xr-x 1 qemu qemu 8589934592 Nov 24 13:08 rh6.img
五、KVM基本的管理命令
[root@rh64 ~]# virsh
Welcome to virsh, the virtualization interactive terminal.
Type:  'help' for help with commands
       'quit' to quit
virsh # help

Grouped commands: Domain Management (help keyword 'domain'):    attach-device                  attach device from an XML file    attach-disk                    attach disk device    attach-interface               attach network interface    autostart                      autostart a domain    blkdeviotune                   Set or query a block device I/O tuning parameters.    blkiotune                      Get or set blkio parameters    blockcommit                    Start a block commit operation.    blockcopy                      Start a block copy operation.    blockjob                       Manage active block operations    blockpull                      Populate a disk from its backing image.    blockresize                    Resize block device of domain.    change-media                   Change media of CD or floppy drive    console                        connect to the guest console    cpu-baseline                   compute baseline CPU    cpu-compare                    compare host CPU with a CPU described by an XML file    cpu-stats                      show domain cpu statistics    create                         create a domain from an XML file    define                         define (but don't start) a domain from an XML file    desc                           show or set domain's description or title    destroy                        destroy (stop) a domain    detach-device                  detach device from an XML file    detach-disk                    detach disk device    detach-interface               detach network interface    domdisplay                     domain display connection URI    domhostname                    print the domain's hostname    domid                          convert a domain name or UUID to domain id    domif-setlink                  set link state of a virtual interface    domiftune                      get/set parameters of a virtual interface    domjobabort                    abort active domain job    domjobinfo                     domain job information    domname                        convert a domain id or UUID to domain name    dompmsuspend                   suspend a domain gracefully using power management functions    dompmwakeup                    wakeup a domain from pmsuspended state    domuuid                        convert a domain name or id to domain UUID    domxml-from-native             Convert native config to domain XML    domxml-to-native               Convert domain XML to native config    dump                           dump the core of a domain to a file for analysis    dumpxml                        domain information in XML    edit                           edit XML configuration for a domain    inject-nmi                     Inject NMI to the guest    send-key                       Send keycodes to the guest    managedsave                    managed save of a domain state    managedsave-remove             Remove managed save of a domain    maxvcpus                       connection vcpu maximum    memtune                        Get or set memory parameters    migrate                        migrate domain to another host    migrate-setmaxdowntime         set maximum tolerable downtime    migrate-setspeed               Set the maximum migration bandwidth    migrate-getspeed               Get the maximum migration bandwidth    numatune                       Get or set numa parameters    reboot                         reboot a domain    reset                          reset a domain    restore                        restore a domain from a saved state in a file    resume                         resume a domain    save                           save a domain state to a file    save-image-define              redefine the XML for a domain's saved state file    save-image-dumpxml             saved state domain information in XML    save-image-edit                edit XML for a domain's saved state file    schedinfo                      show/set scheduler parameters    screenshot                     take a screenshot of a current domain console and store it into a file    setmaxmem                      change maximum memory limit    setmem                         change memory allocation    setvcpus                       change number of virtual CPUs    shutdown                       gracefully shutdown a domain    start                          start a (previously defined) inactive domain    suspend                        suspend a domain    ttyconsole                     tty console    undefine                       undefine a domain    update-device                  update device from an XML file    vcpucount                      domain vcpu counts    vcpuinfo                       detailed domain vcpu information    vcpupin                        control or query domain vcpu affinity    emulatorpin                    control or query domain emulator affinity    vncdisplay                     vnc display Domain Monitoring (help keyword 'monitor'):    domblkerror                    Show errors on block devices    domblkinfo                     domain block device size information    domblklist                     list all domain blocks    domblkstat                     get device block stats for a domain    domcontrol                     domain control interface state    domif-getlink                  get link state of a virtual interface    domiflist                      list all domain virtual interfaces    domifstat                      get network interface stats for a domain    dominfo                        domain information    dommemstat                     get memory statistics for a domain    domstate                       domain state    list                           list domains Host and Hypervisor (help keyword 'host'):    capabilities                   capabilities    connect                        (re)connect to hypervisor    freecell                       NUMA free memory    hostname                       print the hypervisor hostname    node-memory-tune               Get or set node memory parameters    nodecpustats                   Prints cpu stats of the node.    nodeinfo                       node information    nodememstats                   Prints memory stats of the node.    nodesuspend                    suspend the host node for a given time duration    qemu-attach                    QEMU Attach    qemu-monitor-command           QEMU Monitor Command    qemu-agent-command             QEMU Guest Agent Command    sysinfo                        print the hypervisor sysinfo    uri                            print the hypervisor canonical URI    version                        show version Interface (help keyword 'interface'):    iface-begin                    create a snapshot of current interfaces settings, which can be later committed (iface-commit) or restored (iface-rollback)    iface-bridge                   create a bridge device and attach an existing network device to it    iface-commit                   commit changes made since iface-begin and free restore point    iface-define                   define (but don't start) a physical host interface from an XML file    iface-destroy                  destroy a physical host interface (disable it / "if-down")    iface-dumpxml                  interface information in XML    iface-edit                     edit XML configuration for a physical host interface    iface-list                     list physical host interfaces    iface-mac                      convert an interface name to interface MAC address    iface-name                     convert an interface MAC address to interface name    iface-rollback                 rollback to previous saved configuration created via iface-begin    iface-start                    start a physical host interface (enable it / "if-up")    iface-unbridge                 undefine a bridge device after detaching its slave device    iface-undefine                 undefine a physical host interface (remove it from configuration) Network Filter (help keyword 'filter'):    nwfilter-define                define or update a network filter from an XML file    nwfilter-dumpxml               network filter information in XML    nwfilter-edit                  edit XML configuration for a network filter    nwfilter-list                  list network filters    nwfilter-undefine              undefine a network filter Networking (help keyword 'network'):    net-autostart                  autostart a network    net-create                     create a network from an XML file    net-define                     define (but don't start) a network from an XML file    net-destroy                    destroy (stop) a network    net-dumpxml                    network information in XML    net-edit                       edit XML configuration for a network    net-info                       network information    net-list                       list networks    net-name                       convert a network UUID to network name    net-start                      start a (previously defined) inactive network    net-undefine                   undefine an inactive network    net-update                     update parts of an existing network's configuration    net-uuid                       convert a network name to network UUID Node Device (help keyword 'nodedev'):    nodedev-create                 create a device defined by an XML file on the node    nodedev-destroy                destroy (stop) a device on the node    nodedev-detach                 detach node device from its device driver    nodedev-dumpxml                node device details in XML    nodedev-list                   enumerate devices on this host    nodedev-reattach               reattach node device to its device driver    nodedev-reset                  reset node device Secret (help keyword 'secret'):    secret-define                  define or modify a secret from an XML file    secret-dumpxml                 secret attributes in XML    secret-get-value               Output a secret value    secret-list                    list secrets    secret-set-value               set a secret value    secret-undefine                undefine a secret Snapshot (help keyword 'snapshot'):    snapshot-create                Create a snapshot from XML    snapshot-create-as             Create a snapshot from a set of args    snapshot-current               Get or set the current snapshot    snapshot-delete                Delete a domain snapshot    snapshot-dumpxml               Dump XML for a domain snapshot    snapshot-edit                  edit XML for a snapshot    snapshot-info                  snapshot information    snapshot-list                  List snapshots for a domain    snapshot-parent                Get the name of the parent of a snapshot    snapshot-revert                Revert a domain to a snapshot Storage Pool (help keyword 'pool'):    find-storage-pool-sources-as   find potential storage pool sources    find-storage-pool-sources      discover potential storage pool sources    pool-autostart                 autostart a pool    pool-build                     build a pool    pool-create-as                 create a pool from a set of args    pool-create                    create a pool from an XML file    pool-define-as                 define a pool from a set of args    pool-define                    define (but don't start) a pool from an XML file    pool-delete                    delete a pool    pool-destroy                   destroy (stop) a pool    pool-dumpxml                   pool information in XML    pool-edit                      edit XML configuration for a storage pool    pool-info                      storage pool information    pool-list                      list pools    pool-name                      convert a pool UUID to pool name    pool-refresh                   refresh a pool    pool-start                     start a (previously defined) inactive pool    pool-undefine                  undefine an inactive pool    pool-uuid                      convert a pool name to pool UUID Storage Volume (help keyword 'volume'):    vol-clone                      clone a volume.    vol-create-as                  create a volume from a set of args    vol-create                     create a vol from an XML file    vol-create-from                create a vol, using another volume as input    vol-delete                     delete a vol    vol-download                   Download a volume to a file    vol-dumpxml                    vol information in XML    vol-info                       storage vol information    vol-key                        returns the volume key for a given volume name or path    vol-list                       list vols    vol-name                       returns the volume name for a given volume key or path    vol-path                       returns the volume path for a given volume name or key    vol-pool                       returns the storage pool for a given volume key or path    vol-resize                     resize a vol    vol-upload                     upload a file into a volume    vol-wipe                       wipe a vol Virsh itself (help keyword 'virsh'):    cd                             change the current directory    echo                           echo arguments    exit                           quit this interactive terminal    help                           print help    pwd                            print the current directory    quit                           quit this interactive terminal

virsh # start rh6
Domain rh6 started
virsh # list
 Id    Name                           State
----------------------------------------------------
 1     rh6                            running
virsh # console
error: command 'console' requires <domain> option
virsh # console rh6
Connected to domain rh6
Escape character is ^]