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  • <div><p>This ensures that nixops deployments/VMs ...https://wiki.libvirt.org/page/VM_lifecycle#Transient_guest_domains_vs_Persistent_guest_domains</p><p>该提问来源于开源项目:NixOS/nixops</p></div>
  • <p>I found me manually clearing the transient _transient_as_comment_count helped clear the issue straight away <p><strong>Expected behavior correct counts show <p><strong>Actual behavior Showing ...
  • libvirtsAPI

    2014-06-19 16:18:00
    mongodb远程服务器连接 mongo -uroot -p321 master.puppet.org:27017/admin 基于libvcirt的虚拟化guest ...A guest domain may be transient, or persistent. A transient guest domain can only be managed w...

    mongodb远程服务器连接

    mongo -uroot -p321 master.puppet.org:27017/admin

    基于libvcirt的虚拟化guest domain overview:

    A guest domain may be transient, or persistent. A transient guest domain can only be managed while
    it is running on the host and, when powered off, all trace of it will disappear. A persistent guest domain
    has its configuration maintained in a data store on the host by the hypervisor, in an implementation
    defined format. Thus when a persistent guest is powered off, it is still possible to manage its inactive
    config. A transient guest can be turned into a persistent guest on the fly by defining a configuration for
    it.

     

    virDomainLookupByID,virDomainLookupByName,virDomainLokkupByUUID

    Example:Fetching a domain object from ID

    int domainID = 6;

    virDomainPtr dom;

    dom = virDomainLookupByID(conn,domainID);

    example:fetching a domain object from Name

    int domainName = "byRuiy";

    virDomainPtr dom;

    dom = virDomainLookupByName(conn,domainName);

    example:fetching a domain object from an UUID

    char *domainUUID = "byrui-1990-04-03-15055198367-5160-59158"

    virDomainPtr dom

    dom = virDomainLookupByUUIDString(conn,domainUUID);

     

    virConnectListDomains

    virConnectNumOfDomains

    int i;

    int numDomains;

    int *activeDomains;

    numDomains = virConnectNumOfDomains(conn);

    activeDomains = virConnectListDomains(conn,activeDomains,numDomains);

    printf("Active domain IDs:\n");

    for(i = 0;i < numDomains;i++)

    {

    printf("%d \n",activeDomains[i]);

    }

    free(activeDomains);

     

    Exampe:Listing active domais

    there may be some persistent inactive domain configurations stored on the host.

    virConnectListDefinedDomains

    virConnectNumOfDefinedDomains

    int i;

    int numDomains;

    char **inactiveDomains;

    numDomains = virConnectNumOfDefinedDomains(conn);

    inactiveDomains = malloc(sizeof(char *) * numDomains);

    numDomains = virConnectListDomains(conn,inactiveDomains,numDomains);

    printf("Inactive domain names:\n");

    for (i = 0;i < numDomains;i++)

    {

    printf("%s \n",inactiveDomains[i]);

    free(inactiveDomains[i]);

    }

    free(inactiveDomains);

    the APIs for listing domains do not directly return the full virDomainPtr objects,since this may incur

    virDomainPtr *allDomains;

    int numDomains;

    int numActiveDomains,numInactiveDomains;

    char *inactiveDomains;

    int *activeDomains;

    numActiveDomains = virConnectNumOfDomains(conn);

    numInactiveDomains = virConnectNumOfDefinedDomains(conn);

    allDomains = malloc(sizeof(virDomainPtr) * numActiveDomains + numInactiveDomains);

    inactiveDomains = malloc(sizeof(char *) * numDomains);

    activeDomains = malloc(sizeof(int) * numDomains);

    numActiveDomains = virConnectListDomains(conn,activeDomains,numActiveDomains);

    numInactiveDomains = virConnectListDomains(conn,activeDomains,numActiveDomains);

    numInactiveDomains = virConnectListDomains(conn,inactiveDomains,NumInactiveDomains);

    for (i = 0;i < numActiveDomains;i++)

    {

    allDomains[numDomains] = virDomainLoopupByID(aciveDomains[i]);

    numDomains++

    }

    基于libvirt虚拟化 Guest domains lifecycle c ontrol API overview;

    libvirt can control the entire lifecycle of guest domains,guest domains can transition through several states throughout their

    virDomainCreateXML create and immediately boot a new transient guest domain,when this guest domain shuts down,all trace of it will disappear

    virDomainDefineXML store the configuration for a persisent guest domain

    virDomainCreate boot a previously defined guest domain from its persistent configuration,

    virDomainDefineXML command can be used to turn a previously booted transient guest domain into a persistent domain

    booting a transient guest domain

    to boot a transient guest domain,simply requires a connection to libvirt and a string containing the XML document describing the required

    configuration,the following example assumes that conn is

    virDomainPtr dom;

    const char *xmlconfig = "<domain>...</domain>";

    dom = virConnectCreateXML(conn,xmlconfig,0);

    if (!dom) {

    fprintf(stderr,"Domain creation failed");

    return;

    }

    fprintf(stderr,"Guest %s has booted",virDomainName(dom));

    virDomainFree(dom);

    Defining and booting a persistent guest domain

    virDomainPtr dom;

    const char *xmlconfig  = "<domain>..</domain>";

    dom = virConnectDefineXML(conn,xmlconfig,0);

    if (!dom)

    {

    fprintf(stderr,"Domain definition failed");

    return;

    }

    if (virDomainCreate(dom) < 0)

    {

    virDomainFree(dom);

    fprintf(stderr,"Cannot boot guest");

    New guest provisioning techniques

    <domain type='kvm'>

    <name>demo</name>

    <graphics type='vnc' port='-1' listen='localhost'>

     

    }

    CMROM/ISO image provisioning

    <os>

    <type arch='x86_64' machine='pc'>hvm</type>

    <boot dev='hd'/>

    <boot dev='cdrom'/>

    </os>

    <disk type='file' device='cdrom'>

    <source file='/var/lib/libvirt/images/rhel5-x86_64-dvd.iso'/>

    <target dev='hdc' bus='ide'>

    </disk>

    const char *xml = "<domain>...</domain>";

    virDomainPtr dom;

    dom = virDomainDefineXML(conn,xml);

    if (!dom)

    {

    fprintf(stderr,"Unable to define persistent guest configuration");

    return;

    }

    if (virDomainCreate(dom) < 0)

    {

    fprintf(stderr,"Unable to boot guest configuration");

    }

    Paravirtualized (full virtualization)准虚拟化 technologies

    Paravirtualization ()半虚拟化

    <os>

    <type arch='x86_64' machine='pc'>hvm</type>

    <kernel>/var/lib/libvirt/boot/f11-x86_64-vmlinuz</kernel>

    <initrd>/var/lib/libvirt/boot/f11-x86_64-initrd.img</initrd>

    <cmdline>method=http://download.fedoraproject.org/pub/fedora/linux/releases/11/x86_64/osconsole=ttySo console=tty<cmdline>

    </os>

    host side bootloader xen paravirtualized

    <bootloader>/usr/bin/pygrub</bootloader>

    <os>

    <type arch='x86_64' machine='pc'>xen</type>

    </os>

    BIOS boot setup fully virtualized guest

    const char *xml = "<domain>...</domain>"
    virDomainPtr dom;
    dom = virDomainCreateXML(conn,xml);
    if (!dom)
    {
    fprintf(stderr,"Unable to define persistent guest configuration \n");
    return;
    }
    if (virDomainCreate(dom) < 0) {
    fprintf("stderr,"Unable to boot persistent guest \n"");
    return;
    }
    fprintf(stderr,"Guest provisoning complete,OS is running \n");

    stopping

    a guest can be stopped by two methods

    shutdown and destroy

    virDomainPtr dom;
    virDomainInfoPtr info;
    const char *filename = "/var/lib/libvirt/save/demo-guest.img";
    dom = virDomainLookupByName(conn,"demo-guest");
    //id,uuid,name/第二个参数;
    //virDomainPtr,virDomainLokkupByID,virDomainByName,virDomainByUUID
    if (!dom)
    {
    fprintf(stderr,"Cannot find guest to be saved");
    return;
    }
    if (virDomainGetInfo(dom,&info) < 0)
    {
    fprintf(stderr,"Cannot check guest state");
    return;
    }
    if (info.state == VIR_DOMAIN_SHUTOFF)
    {
    fprintf(stderr,"Not saving guest that isn't  running");
    }
    if (virDomainSave(dom,filename) < 0)
    {
    fprintf(stderr,"Unable to save guest to %s ",filename);
    }
    fprintf(stderr,"Guest state saved to %s",filename);

    virDomainPtr dom;

    int id;

    const char *filename = "/var/lib/libvirt/save/demo-guest.img";

    if ((id = virDomainRestore(conn,filename)) < 0)

    {

    fprintf(stderr,"Unable to restore guest from %s",filename);

    }

    dom = virDomainLookupByID(conn,id);

    if (!dom) {

    fprintf(stderr,"Cannot find guest that was restored");

    return;

    }

    virDomainMigrate established hypervisor connection

    domains are defined in libvirt using XML  Everything related only to the domain

    monitoring performance

    statistical metrics are available for monitoring the utilization rates of domains,

    vCPUS,Vmemory,block devices ,netWork interfaces;

    virNodeDevicePtr de= get virNodeDevicePtr for the PCI device
    if (virNodeDeviceDettach(dev) < 0)
    {
    fprintf(stderr,"Device cannot be dettached from the host OS drivers \n");
    return;
    }
    if (virNodeDeviceReset(dev) < 0)
    {
    fprintf(stderr,"Device cannot be safely reset without affecting other devices \n");
    }

    virInterfaceDefineXML virInterfaceGetXMLDesc

    xml definition of an ethernet interface using DHCP

    <interface type='ethernet' name='eth0'>

    <start mode='onboot'/>

    <mac address=''/>

    <protocol family='ipv4'>

     

    xml definition of an ethernet interface with static ip

    <interface type='ethernet' name='eth0'>

    <start mode='onboot'/>

    <mac address=''>

    <protocol family=''>

    <ip address="" prefix="24"/>

    <route gateway="">

    </protocol>

    </interface>

    xml definition of a bridge device with eth0 and eth1 attached

    <interface type="bridge" name="br0">

    <start mode="onboot"/>

    <mtu size="1500"/>

    <protocol family="ipv4">

    <dhcp/>

    </protocol>

    <bridge stp="off" delay="0.01">

    <interface type="ethernet" name="eth0">

    <mac address=""/>

    </interface>

    <interface type="ethernet" name="eth1"/>

    </bridge>

    </interface>

    xml definition of a vlan interface associated with eth0

    <interface type="value" name="eth0.042">

    <start mode="onboot"/>

    <protocol family="ipv4">

    <dhcp peerdns="no"/>

    </protocol>

    <vlan tag="42">

    <interface name="eth0"/>

    </vlan>

    </interface>

    retrieving information about interfaces

    enumerating interfaces

    have a connection to a host,respresented by a virConnectPtr,determine the number of interface on the host with virConnectNumOfInterfaces

    and virConnectNumOfDefinedInterfaces

    a list of those interfaces names can be obtained with virConnectListInterfaces and virConnectListDefinedInterfaces

    ("defined"  interfaces are those that have been defined,but are currently inactive)

    getting a list of active("up" interfaces on a host)

    int numIfaces,i
    char *ifaceNames;
    numIfaces = virConnectNumOfInterfaces(conn);
    ifaceNames = malloc(numIfaces * sizeof(char *));
    numIfaces = virConnectListInterfaces(conn,names,ct);
    printf("Active host interfaces:\n");
    for(i = 0;i < numIfaces;i++)
    {
    printf("%s \n",ifaceNames[i]);
    free(ifaceNames[i]);
    }
    free(ifaceNames);

    getting a list of inactive ("down") interfaces on a host

    int numIfaces,i;
    char *ifaceNames;
    numIfaces = virConnectNumOfDefinedInterfaces(conn);
    ifaceNames = malloc(numIfaces * sizeofchar *));//分配内存空间
     numIfaces = virConnectListDefinedInterfaces(conn,names,ct);
    printf("Inactive host interfaces:\n");
    for (i = 0;i < numIfaces;i++)
    {
    prientf("%s \n",ifaceNames[i]);
    free(ifaceNames[i]);
    }
    free(faceNames);

    altrnative method of enumerating interfaces

    virNodeDevice

    virNodeListDevices virNodeDeviceLookupByName virNodeDeviceGetXMLDesc 

    obtaining a virInterfacePtr for an interface

    many operations require that you have a virInterfacePtr,but you may only have the name or MAC address of the interface

    use virInterfaceLookupByName and virInterfaceLookupByMACString to get the virInterfacePtr

    virInterfacePtr iface;

    const char *name = "eth0";

    iface = virInterfaceLookupByName(name);

    if (iface)

    {

    /*  use the virInterfacePtr*/

    virInterfaceFree(iface);

    }

    else

    {

    printf("Interface '%s' not found. \n",name);

    }

    virInterfacePtr iface;

    const char *mac ="";

    iface = virInterfaceLookupByMACString(mac);

    if (iface) {

    //use the virInterfacePtr;

    virInterfaceFree(iface);

    }

    else

    {

    printf("No interface found with MAC address '%s'.\n",mac);

    }

    virInterfaceGetName virInterfaceMACString virInterfaxceGetXMLDesc

    const char *name;

    const char *mac;

    name = virInterfaceGetName(iface);

    mac = virInterfaceGetMACString(iface);

    printf("Interface %s has MAC address %s",name,mac);

    virInterfaceGetXMLDesc

    const char *xml;

    name = virInterfaceGetXMLDesc(iface,0);

    printf("Interface configuration:\n%s \n",xml);

    free(xml);

    //xml is a char * containing the description

    virInterfacePtr iface;

    iface = virInterfaceDefineXML(xml,0);

    if (!iface)

    {

    fprintf(stderr,"Failed to define interface. \n");

    //other error handling

    goto cleanup;

    virInterfaceFree(iface);

    cleanup;

    }

    virInterfacePtr iface;

    char *xml = NULL;

    iface = virInterfaceLookupByName("br0");

    if (!iface)

    {

    printf("Interface br0 not found. \n");

    }

    else

    {

    xml = virInterfaceGetXMLDesc(iface,0);

    virInterfaceUndefine(iface);

    virInterfaceFree(iface);

    }

    //you must also free the buffer at xml when you're finished with it

    activating/deactivating an interface

    temporarily bring down eth2,then bring it back up

    virInterfaqcePtr iface;
    iface = virInterfaceLookupByName("eth2");
    if (!iface){
    printf("Interface eth2 not found. \n");
    }
    else{
    if (virInterfaceDestroy(iface) != 0)
    {
    fprintf(stderr,"failed to destroy (deactive) interface eth2. \n");
    }
    else{
    //
    if (virInterfaceCreate(iface) != 0){
    fprintf(stderr,"failed to create (active) interface eth2. \n");
    }
    }
    free(iface);
    }

     

    展开全文
  • transient guest" (whatever that means): <pre><code> libvirt-guests.sh[5692]: Not suspending transient guests on URI: default: nixops-854089ab-66e8-11e7-8deb-02421296f7a0-example </code></pre> <p>...
  • SpringBoot+Rabbit

    2018-12-26 16:57:41
    1.安装Rabbit,参考... 2.进入http://localhost:15672,账户密码都是 guest 3.新建一个消息队列  Durability:选择Transient。 4.新建一个交换机exchange    解释① 这个是消息队列的名字 queu...

    1.安装Rabbit,参考(https://www.cnblogs.com/ericli-ericli/p/5902270.html

    2.进入http://localhost:15672,账户密码都是   guest

    3.新建一个消息队列

     Durability:选择Transient。

    4.新建一个交换机exchange

     

     解释①    这个是消息队列的名字  queue1  。

            ②    Routing key  正则表达式去匹配对应的key,从头开始匹配

    5.java代码实现

    (1)在pom文件引入jar包

    <!-- 添加springboot对amqp的支持 -->
    <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-amqp</artifactId>
    </dependency>

    (2)新建2个SpeingBoot项目   receive、sender

             在启动项加注解  @EnableRabbit;

              在配置文件加配置:

    spring:
      application:
        name: sender
      rabbitmq:
        host: 127.0.0.1
        port: 5672
        username: guest
        password: guest

           

             新建发送类

    import org.springframework.amqp.core.AmqpTemplate;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    @Component
    public class HelloSender {
    
       @Autowired
       private AmqpTemplate amqpTemplate;
    
       public void send(String va){
          amqpTemplate.convertAndSend("queue","queue",va);
          System.out.print("OK");
       }
    }
    

    备注:convertAndSend中3个参数的含义,第一个是交换机的名字,第二个是对应Routing key 的值(有可能第二个参数是queue123,Routing key 的值也可以是queue,因为是正则表达式从头匹配的,不同的策略不同的计算方法),第三个是消息内容

    (3)新建测试类

            

    @SpringBootTest(classes = SenderApplication.class)
    @RunWith(SpringJUnit4ClassRunner.class)
    public class TestRabbitMQ {
    
       @Autowired
       private HelloSender helloSender;
    
       @Test
       public void testRabbit() {
          helloSender.send("wdwdwd12312s");
       }
    }

    至此发送端简单发送成功

    (4)在receive项目中引入jar包,启动项加注解,和发送端相同;

             新建监听消息队列接口

            

    import org.springframework.amqp.rabbit.annotation.RabbitListener;
    import org.springframework.stereotype.Component;
    
    @Component
    public class HelloReceive {
       @RabbitListener(queues = "queue1")
       public void processC(String str) {
          System.out.println("Receive:"+str);
       }
    }
    

    至此整个简单的发送和接收都能起作用。

    至于Rebbit的基本知识可以百度

    6.RabbitMQ是通过Binding将Exchange和Queue链接在一起,这样Exchange就知道如何将消息准确的推送到Queue中去

    7.在绑定(Binding)Exchange和Queue的同时,一般会指定一个Binding Key,生产者将消息发送给Exchange的时候,一般会产生一个Routing Key,当Routing Key和Binding Key对应上的时候,消息就会发送到对应的Queue中去。那么Exchange有四种类型,不同的类型有着不同的策略。也就是表明不同的类型将决定绑定的Queue不同,换言之就是说生产者发送了一个消息,Routing Key的规则是A,那么生产者会将Routing Key=A的消息推送到Exchange中,这时候Exchange中会有自己的规则,对应的规则去筛选生产者发来的消息,如果能够对应上Exchange的内部规则就将消息推送到对应的Queue中去。那么接下来就来详细讲解下Exchange里面类型。

         Exchange Type

        我来用表格来描述下类型以及类型之间的区别。

    • fanout

            fanout类型的Exchange路由规则非常简单,它会把所有发送到该Exchange的消息路由到所有与它绑定的Queue中。

        上图所示,生产者(P)生产消息1将消息1推送到Exchange,由于Exchange Type=fanout这时候会遵循fanout的规则将消息推送到所有与它绑定Queue,也就是图上的两个Queue最后两个消费者消费。

    • direct

            direct类型的Exchange路由规则也很简单,它会把消息路由到那些binding key与routing key完全匹配的Queue中

         当生产者(P)发送消息时Rotuing key=booking时,这时候将消息传送给Exchange,Exchange获取到生产者发送过来消息后,会根据自身的规则进行与匹配相应的Queue,这时发现Queue1和Queue2都符合,就会将消息传送给这两个队列,如果我们以Rotuing key=create和Rotuing key=confirm发送消息时,这时消息只会被推送到Queue2队列中,其他Routing Key的消息将会被丢弃。

    • topic

          前面提到的direct规则是严格意义上的匹配,换言之Routing Key必须与Binding Key相匹配的时候才将消息传送给Queue,那么topic这个规则就是模糊匹配,可以通过通配符满足一部分规则就可以传送。它的约定是:

    1. routing key为一个句点号“. ”分隔的字符串(我们将被句点号“. ”分隔开的每一段独立的字符串称为一个单词),如“stock.usd.nyse”、“nyse.vmw”、“quick.orange.rabbit”
    2. binding key与routing key一样也是句点号“. ”分隔的字符串
    3. binding key中可以存在两种特殊字符“*”与“#”,用于做模糊匹配,其中“*”用于匹配一个单词,“#”用于匹配多个单词(可以是零个)

      当生产者发送消息Routing Key=F.C.E的时候,这时候只满足Queue1,所以会被路由到Queue中,如果Routing Key=A.C.E这时候会被同是路由到Queue1和Queue2中,如果Routing Key=A.F.B时,这里只会发送一条消息到Queue2中。

    • headers

    headers类型的Exchange不依赖于routing key与binding key的匹配规则来路由消息,而是根据发送的消息内容中的headers属性进行匹配。
    在绑定Queue与Exchange时指定一组键值对;当消息发送到Exchange时,RabbitMQ会取到该消息的headers(也是一个键值对的形式),对比其中的键值对是否完全匹配Queue与Exchange绑定时指定的键值对;如果完全匹配则消息会路由到该Queue,否则不会路由到该Queue。
    该类型的Exchange没有用到过(不过也应该很有用武之地),所以不做介绍。

    这里在对其进行简要的表格整理:

    Exchange规则
    类型名称 类型描述
    fanout 把所有发送到该Exchange的消息路由到所有与它绑定的Queue中
    direct Routing Key==Binding Key
    topic 我这里自己总结的简称模糊匹配
    headers Exchange不依赖于routing key与binding key的匹配规则来路由消息,而是根据发送的消息内容中的headers属性进行匹配。

      补充说明:

      ConnectionFactory、Connection、Channel

      ConnectionFactory、Connection、Channel都是RabbitMQ对外提供的API中最基本的对象。Connection是RabbitMQ的socket链接,它封装了socket协议相关部分逻辑。ConnectionFactory为Connection的制造工厂。
      Channel是我们与RabbitMQ打交道的最重要的一个接口,我们大部分的业务操作是在Channel这个接口中完成的,包括定义Queue、定义Exchange、绑定Queue与Exchange、发布消息等。

      Connection就是建立一个TCP连接,生产者和消费者的都是通过TCP的连接到RabbitMQ Server中的,这个后续会再程序中体现出来。

      Channel虚拟连接,建立在上面TCP连接的基础上,数据流动都是通过Channel来进行的。为什么不是直接建立在TCP的基础上进行数据流动呢?如果建立在TCP的基础上进行数据流动,建立和关闭TCP连接有代价。频繁的建立关闭TCP连接对于系统的性能有很大的影响,而且TCP的连接数也有限制,这也限制了系统处理高并发的能力。但是,在TCP连接中建立Channel是没有上述代价的。

     

    展开全文
  • guest: 虚拟计算机 2、创建Share A) 选择虚拟机窗口菜单项"Devices -> Shared Folders"。 B) 在弹出的窗口"Shared Folders"中,选中列表中的"Transient Folders"。 C) 这时窗口右侧三个按钮中最上方的带有"+"的...

    一、安装依赖包

    #yum install kernel-headers
    #yum install kernel-devel
    #yum install gcc* 
    #yum install make

    二、安装增强功能包

      1、安装命令

    #mount /dev/cdrom /mnt/cdrom
    #cd /mnt/cdrom #./VBoxLinuxAdditions.run

     2、 共享设置

        (1) 设备->分配数据空间

        (2) 挂载/卸载命令

    #mkdir /mnt/share
    #mount -t vboxsf myshare /mnt/share/

    #umount -f /mnt/share

        (3)开机自动共享

    #vim /etc/fstab
     
     添加一项
     
     myshare /mnt/share vboxsf rw,gid=100,uid=1000,auto 0 0

    1、名词解释


    host:  物理计算机
    guest: 虚拟计算机


    2、创建Share

    A) 选择虚拟机窗口菜单项"Devices -> Shared Folders"。
    B) 在弹出的窗口"Shared Folders"中,选中列表中的"Transient Folders"。
    C) 这时窗口右侧三个按钮中最上方的带有"+"的按钮会变为可用状态,点击这个按钮。
    D) 在弹出的窗口"Add Share"中,在输入框"Folder Path"中输入host要共享的目录,在输入框"Folder Name"中输入在guest中要使用的share folder名字,点击按钮"OK"关闭当前窗口。
    E) 这时窗口"Shared Folders"列表中"Transient Folders"项目下会出现以刚刚添加的共享目录名字的子项目。


    3、使用Share

    例:已建立名字为"tool"的share folder

    A) guest OS为 linux

    # mkdir /mnt/share
    # mount -t vboxsf tool /mnt/share

    B) guest OS为 windows

    net use z: \vboxsvr\tool
    (注:vboxsvr前面是2个\,不知道为什么就是不能正常显示,YM啊)



    4、OK,Shared Folder已经可用了。





    关键词(Tag): 使用 centos virtualbox shared folder
    展开全文
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