KVM虚拟机添加虚拟磁盘

2eew

step1：创建一个qcow2格式的磁盘镜像

[iyunv@kvm ~]# qemu-img create -f qcow2 /kvm/centos1_1.qcow2 5G
Formatting '/kvm/centos1_1.qcow2', fmt=qcow2 size=5368709120 encryption=off cluster_size=65536

[iyunv@kvm ~]# virsh destroy centos1
Domain centos1 destroyed


step2：编辑/etc/libvirt/qemu/centos1.xml 增加磁盘模块

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[iyunv@kvm ~]# vim /etc/libvirt/qemu/centos1.xml 或者 [iyunv@kvm ~]# virsh edit centos1     <disk type='file' device='disk'>       <driver name='qemu' type='qcow2' cache='none'/>       <source file='/kvm/centos1_1.qcow2'/>       <target dev='vdb' bus='virtio'/>     </disk>

开启虚拟机

1 2	[iyunv@kvm ~]# virsh start centos1 [iyunv@kvm ~]# virsh console centos1

step3：分区

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[iyunv@localhost ~]# fdisk -l Disk /dev/vda: 16.1 GB, 16106127360 bytes 16 heads, 63 sectors/track, 31207 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000e5856    Device Boot      Start         End      Blocks   Id  System /dev/vda1   *           3        1018      512000   83  Linux Partition 1 does not end on cylinder boundary. /dev/vda2            1018       20806     9972736   8e  Linux LVM Partition 2 does not end on cylinder boundary. /dev/vda3           20807       31207     5242104   83  Linux Disk /dev/vdb: 5368 MB, 5368709120 bytes 16 heads, 63 sectors/track, 10402 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/VolGroup-lv_root: 14.5 GB, 14533263360 bytes 255 heads, 63 sectors/track, 1766 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/VolGroup-lv_swap: 1040 MB, 1040187392 bytes 255 heads, 63 sectors/track, 126 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000

分区

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[iyunv@localhost ~]# fdisk /dev/vdb Command (m for help): p Command (m for help): n Command action    e   extended    p   primary partition (1-4) p Partition number (1-4): Value out of range. Partition number (1-4): 1 First cylinder (1-10402, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-10402, default 10402): Using default value 10402 Command (m for help): p Disk /dev/vdb: 5368 MB, 5368709120 bytes 16 heads, 63 sectors/track, 10402 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x3d00f46a    Device Boot      Start         End      Blocks   Id  System /dev/vdb1               1       10402     5242576+  83  Linux Command (m for help): w The partition table has been altered!

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[iyunv@localhost ~]# partx /dev/vdb # 1:        63- 10485215 ( 10485153 sectors,   5368 MB) # 2:         0-       -1 (        0 sectors,      0 MB) # 3:         0-       -1 (        0 sectors,      0 MB) # 4:         0-       -1 (        0 sectors,      0 MB) [iyunv@localhost ~]# ll /dev/vdb* brw-rw----. 1 root disk 252, 16 Jan 17 01:22 /dev/vdb brw-rw----. 1 root disk 252, 17 Jan 17 01:22 /dev/vdb1

格式化

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[iyunv@localhost ~]# mkfs.ext4 /dev/vdb1 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 327680 inodes, 1310644 blocks 65532 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1342177280 40 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736 Writing inode tables: done                            Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 27 mounts or 180 days, whichever comes first.  Use tune2fs -c or -i to override.

挂载/自动挂载

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[iyunv@localhost ~]# mkdir /data [iyunv@localhost ~]# mount /dev/vdb1 /data/ EXT4-fs (vdb1): mounted filesystem with ordered data mode. Opts:

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[iyunv@localhost ~]# df -Th Filesystem           Type   Size  Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root                      ext4    14G  685M   12G   6% / tmpfs                tmpfs  246M     0  246M   0% /dev/shm /dev/vda1            ext4   477M   33M  419M   8% /boot /dev/vdb1            ext4   4.8G   10M  4.6G   1% /data

1 2	[iyunv@localhost ~]# vi /etc/fstab /dev/vdb1               /data                   ext4    defaults        0 0