CentOS下kvm虚拟机磁盘扩展 - CentOS入门

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CentOS下kvm虚拟机磁盘扩展

浏览次数:2025 关键词（磁盘虚拟机 CentOS kvm ）

两种方式:

1.添加一块新的虚拟磁盘

2.扩充原有磁盘的容量大小

注意:

只有磁盘格式为qcow2的磁盘才支持磁盘快照和磁盘动态扩展.

测试的虚拟机磁盘大小和格式.

方法一:添加新磁盘

1.查看已存在盘的大小

[root@kvm-node154 vm]# qemu-img info api1-qcow2.img image: api1-qcow2.img file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 1.5G cluster_size: 65536

<disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/vm/api1-qcow2.img'/> <target dev='vda' bus='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </disk>

2.添加一块qcow2的盘,大小为10G

cd /vm && qemu-img create -f qcow2 api1-qcow2_add1.img 8G [root@kvm-node154 vm]# qemu-img info api1-qcow2_add1.img image: api1-qcow2_add1.img file format: qcow2 virtual size: 10G (10737418240 bytes) disk size: 140K cluster_size: 65536 [root@kvm-node154 vm]# ll /vm 总用量 3161404 -rwxr-xr-x 1 qemu qemu 1580662784 1月 11 14:55 api2-qcow2.img -rw-r--r-- 1 root root 197120 1月 11 14:53 api1-qcow2_add1.img -rw-r--r-- 1 qemu qemu 1653407744 1月 11 14:55 api1-qcow2.img

3.添加api1-qcow2_add1.img到配置文件中

[root@kvm-node154 vm]# virsh shutdown api1 域 api4 被关闭

[root@kvm-node154 vm]# virsh list --all Id 名称状态 ---------------------------------------------------- 2 api2 running - api1 关闭

virsh edit api1,添加新磁盘

<disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/vm/api1-qcow2_add1.img'/> <target dev='vdb' bus='virtio'/> </disk>

4.登录到api1终端,然后查看,并分区/dev/vdb

[root@vm-api1 ~]# fdisk -l Disk /dev/vdb: 8589 MB, 8589934592 bytes 16 heads, 63 sectors/track, 16644 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

5.格式化分区/dev/vdb,并且转换为lvm格式.

fdisk /dev/vdb >> lvm [root@vm-api1 ~]# fdisk -l Disk /dev/vdb: 8589 MB, 8589934592 bytes 16 heads, 63 sectors/track, 16644 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: 0xa91642d5 Device Boot Start End Blocks Id System /dev/vdb1 1 16644 8388544+ 8e Linux LVM

[root@vm-api1 ~]# pvcreate /dev/vdb1 Physical volume "/dev/vdb1" successfully created [root@vm-api1 ~]# vgs VG #PV #LV #SN Attr VSize VFree VolGroup 1 2 0 wz--n- 7.51g 0 [root@vm-api1 ~]# vgextend VolGroup /dev/vdb1 Volume group "VolGroup" successfully extended [root@vm-api1 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert

lv_root VolGroup -wi-ao----   6.71g

lv_swap VolGroup -wi-ao---- 816.00m [root@vm-api1 ~]# lvextend -l +100%FREE /dev/VolGroup/lv_root Size of logical volume VolGroup/lv_root changed from 6.71 GiB (1718 extents) to 14.71 GiB (3765 extents). Logical volume lv_root successfully resized [root@vm-api1 ~]# resize2fs /dev/VolGroup/lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/VolGroup/lv_root to 3855360 (4k) blocks. The filesystem on /dev/VolGroup/lv_root is now 3855360 blocks long.

6.再次查看vm的磁盘大小

[root@vm-api1 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 15G 652M 13G 5% / tmpfs 246M 0 246M 0% /dev/shm /dev/vda1 477M 25M 427M 6% /boot

方法二:扩充原有磁盘的大小

1.查看原磁盘的大小

[root@kvm-node154 vm]# qemu-img info /vm/api2-qcow2.img image: /vm/api2-qcow2.img file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 2.4G cluster_size: 65536 Snapshot list:

ID        TAG                 VM SIZE                DATE       VM CLOCK

2 api2_ftp 320M 2016-01-08 16:59:52 01:17:18.639 3 api2_httpd 385M 2016-01-08 17:27:16 00:53:48.096

2.关闭vm,然后直接扩充api2-qcow2.img

[root@kvm-node154 vm]# virsh shutdown api2

域 api2 被关闭

[root@kvm-node154 vm]# virsh list --all Id 名称状态 ---------------------------------------------------- 3 api1 running - api2 关闭 [root@kvm-node154 vm]# qemu-img resize api2-qcow2.img +8G This image format does not support resize //提示不能这种格式不支持扩充 [root@kvm-node154 vm]# virsh 欢迎使用 virsh，虚拟化的交互式终端。 输入：'help' 来获得命令的帮助信息 'quit' 退出 virsh # snapshot-list api2 名称 Creation Time 状态 ------------------------------------------------------------ api2_ftp 2016-01-08 16:59:52 +0800 running api2_httpd 2016-01-08 17:27:16 +0800 running virsh # snapshot-delete api api1-qcow2_add1.img api1-qcow2.img api2-qcow2.img virsh # snapshot-delete api2 api2_ftp Domain snapshot api2_ftp deleted virsh # snapshot-delete api2 api2_httpd Domain snapshot api2_httpd deleted [root@kvm-node154 vm]# qemu-img resize api2-qcow2.img +8G Image resized.

3.查看已经扩充的磁盘

[root@kvm-node154 vm]# qemu-img info api2-qcow2.img image: api2-qcow2.img file format: qcow2 virtual size: 16G (17179869184 bytes) disk size: 2.4G cluster_size: 65536

4.启动vm,然后分区,并格式化

[root@kvm-node154 vm]# virsh start api2 域 api2 已开始 [root@vm-api2 ~]# pvcreate /dev/vda3 Physical volume "/dev/vda3" successfully created [root@vm-api2 ~]# vgs VG #PV #LV #SN Attr VSize VFree VolGroup 1 2 0 wz--n- 7.51g 0 [root@vm-api2 ~]# vgextend VolGroup /dev/vda3 Volume group "VolGroup" successfully extended [root@vm-api2 ~]# lvextend -l +100%FREE /dev/VolGroup/lv_root Size of logical volume VolGroup/lv_root changed from 6.71 GiB (1718 extents) to 14.71 GiB (3765 extents). Logical volume lv_root successfully resized [root@vm-api2 ~]# resize2fs /dev/VolGroup/lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/VolGroup/lv_root to 3855360 (4k) blocks. The filesystem on /dev/VolGroup/lv_root is now 3855360 blocks long. [root@vm-api2 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 15G 655M 13G 5% / tmpfs 246M 0 246M 0% /dev/shm /dev/vda1 477M 25M 427M 6% /boot

成功添加了磁盘.

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