KVM虚拟化(二)

zhangleivod

25.Storage
        1.preallocated:
                faster write speeds than a virtual disk with a thin provisioning.
        2.Thin-Provisioned(space will be allocated for the volume as needed):
                To create a thin-provisioned disk, use the seek option with the dd command
                #dd if=/dev/zero of=/vms/vms_disk.img bs=1G count=0 seek=10
        3.qemu-img. This command allows you to read the metadata of a virtual image
                #qemu-img info /vms/vms_disk.img
                #qemu-img info /vms/vms_disk_seek.img
        4.attach a disk using virsh
                # virsh attach_disk node1 /vms/dbvm_disk.img vdb --live --config
                (vdb is the target disk name that would be visible inside the guest operating system.
                --live means performing the action while the virtual machine is running
                --config switch will keep the disk attached only till reboot)

        5.virsh domblklist node1 --details #查看虚拟机上有多少虚拟磁盘
        6.存储是由libvirt来监控，管理存储（存储池和存储卷）
        7.查看系统的虚拟池
                #virsh pool-list
                #virsh pool-info default
        8.The XML definition file of each storage pool is stored in /etc/libvirt/storage
        9.virsh 创建存储池
                #virsh pool-define-as dedicated_storagedir dir ---- "/vms"  #定义池(不要省略4个-)
                #virsh pool-build dedicated_storagedir       #创建池
                #virsh pool-start dedicated_storagedir                 #启动池
        10.virsh pool-list --all #查看所有存储池
        11.virsh pool-autostart dedicated_storage   #设置自动开启存储池
        12.直接输入virsh使用交互模式