首页 / 操作系统 / Linux / 应用Libvirt连接KVM虚拟化平台

发布一段Ｃ代码，用于连接指定的KVM宿主机器，获得该宿主机器的配置信息，以及该主机上所有的虚拟主机列表、状态及配置信息：#include <stdio.h>
#include <stdlib.h>
#include <libvirt/libvirt.h>void ListDom（virConnectPtr conn）
{
    char **inactiveDom;
    virDomainPtr *allDom;
    int nInActiveDoms = virConnectNumOfDefinedDomains（conn）; 
    allDom = malloc（sizeof（virDomainPtr）* nInActiveDoms）;
    int i = 0;
    char str[200];
   virDomainInfo t;
    if（nInActiveDoms ！= 0）
    {
        printf（"inactive num: %d ",nInActiveDoms）;
        inactiveDom = malloc（sizeof（char*） * （nInActiveDoms））;
        nInActiveDoms  = virConnectListDefinedDomains（conn , inactiveDom , nInActiveDoms）; 
        printf（"numOfInactiveDom*************:%d ", nInActiveDoms）;
 
        for（i=0 ; i<nInActiveDoms; i++）
        {
            printf（"name:%s ",inactiveDom[i]）;
            allDom[i] = virDomainLookupByName（conn , inactiveDom[i]）;
            virDomainGetUUIDString（allDom[i],str）;
            printf（"uuid:%s | os:%s ",str,virDomainGetOSType（allDom[i]））;   
            virDomainGetInfo（allDom[i],&t）;
            printf（"HostName:%s ",virDomainGetName（allDom[i]））;
            printf（"state:%d|maxmem:%d|memused:%d|cpunum:%d|cputime:%ld ",t.state,t.maxMem,t.memory,t.nrVirtCpu,t.cpuTime）;
          }
    }
}
void ListActiveDom（virConnectPtr conn）
{
    int numOfActiveDom = virConnectNumOfDomains（conn）;
    int activeDom[numOfActiveDom];
    virDomainPtr *allDomains;     
   virDomainInfo t;
    int i ;
    char str[200];
    allDomains = malloc（sizeof（virDomainPtr）* numOfActiveDom）; 
    numOfActiveDom = virConnectListDomains（conn , activeDom , numOfActiveDom）; 
   
    printf（"Active Dom: "）; 
    for（i=0 ; i<numOfActiveDom ; i++）{
        printf（"id:%d ",activeDom[i]）; 
        allDomains[i] = virDomainLookupByID（conn ,activeDom[i]）;  //ͨ¹ýidÈ¡Domain 
        virDomainGetUUIDString（allDomains[i],str）;
        printf（"uuid:%s | os:%s ",str,virDomainGetOSType（allDomains[i]））;   
        printf（"HostName:%s ",virDomainGetName（allDomains[i]））;
        virDomainGetInfo（allDomains[i],&t）;
        printf（"state:%d|maxmem:%d|memused:%d|cpunum:%d|cputime:%ld ",t.state,t.maxMem,t.memory,t.nrVirtCpu,t.cpuTime）;
    }
}
int main（int argc, char *argv[]）
{
    virConnectPtr conn;
    char* caps;
    virNodeInfo nodeinfo;   
    char str[200];
    char *struuid[200];
    int max = 0;
    int i = 0;
    virNodeMemoryStats *pMem;
    int pN[100];
    while（1）
    {
     printf（"Input KVM Host:>"）;
     gets（str）;
     printf（" "）;
     if（strcmp（str,"quit"） == 0）
     {
          printf（"Bye-Bye "）;
          exit（0）;
     }
     conn = virConnectOpen（str）;
     if （conn == NULL） {
         fprintf（stderr, "Failed to open connection to qemu:///system "）;
         continue;
     }
     caps = virConnectGetCapabilities（conn）;
     fprintf（stdout, "Capabilities: %s ", caps）;
     free（caps）;     printf（"HostName: %s ",virConnectGetHostname（conn））;
     fprintf（stdout, "Virtualization type: %s ", virConnectGetType（conn））;     virNodeGetInfo（conn, &nodeinfo）;
     fprintf（stdout, "Model: %s ", nodeinfo.model）;
     fprintf（stdout, "Memory size: %lukb ", nodeinfo.memory）;
     fprintf（stdout, "Number of CPUs: %u ", nodeinfo.cpus）;
     fprintf（stdout, "MHz of CPUs: %u ", nodeinfo.mhz）;
     fprintf（stdout, "Number of NUMA nodes: %u ", nodeinfo.nodes）;
     fprintf（stdout, "Number of CPU sockets: %u ", nodeinfo.sockets）;
     fprintf（stdout, "Number of CPU cores per socket: %u ", nodeinfo.cores）;
     fprintf（stdout, "Number of CPU threads per core: %u ", nodeinfo.threads）;
    /* printf（"Sysinfor :[%s] ",virConnectGetSysinfo（conn,0））;     pMem = malloc（sizeof（virNodeMemoryStats）* 100）;
     virNodeGetMemoryStats（conn,VIR_NODE_MEMORY_STATS_ALL_CELLS,pMem,pN,0）;
        for（i = 0; i < 10; i++）
        {
            printf（"MEM STAT %s - %ld ",pMem[i].field,pMem[i].value）;
        }*/
     ListDom（conn）;
     ListActiveDom（conn）;
     virConnectClose（conn）;
    }
    return 0;
} 执行效果如下：[root@kvm T]# ./t
Input KVM Host:>qemu+ssh:///system