kvm虚拟机磁盘扩容
kvm虚拟机磁盘扩容 链接 (opens new window)
# 1. 虚拟机先关机
[root@kvm_33 ~]# virsh destroy jumpserver-33.240
域 jumpserver-33.240 被删除
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# 2. 查看磁盘格式
[root@kvm_33 ~]# virsh edit jumpserver-33.240
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/vm/jumpserver-33.240/jumpserver-33.240.img'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</disk>
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# 3.查看磁盘大小
[root@kvm_33 ~]# qemu-img info /vm/jumpserver-33.240/jumpserver-33.240.img
image: /vm/jumpserver-33.240/jumpserver-33.240.img
file format: qcow2
virtual size: 400G (429496729600 bytes)
disk size: 8.4G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
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# 4.扩容磁盘
[root@kvm_33 ~]# qemu-img resize /vm/jumpserver-33.240/jumpserver-33.240.img +10G
Image resized.
[root@kvm_33 ~]# qemu-img info /vm/jumpserver-33.240/jumpserver-33.240.img
image: /vm/jumpserver-33.240/jumpserver-33.240.img
file format: qcow2
virtual size: 410G (440234147840 bytes)
disk size: 8.4G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
----------------------------------------------
经过前后对比，磁盘大小已由400G扩展到410G
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# 5.启动虚拟机
[root@kvm_33 ~]# virsh start jumpserver-33.240
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# 6.登录 jumpserver-33.240
[root@jumpserver-33 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 9.2M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 350G 9.6G 341G 3% /
/dev/vda1 1014M 143M 872M 15% /boot
/dev/mapper/centos-home 46G 41M 46G 1% /home
------------------------------------------------------
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# 7.查看分区
[root@jumpserver-33 ~]# fdisk -l
Disk /dev/vda: 440.2 GB, 440234147840 bytes, 859832320 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a8f64
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 209715199 103808000 8e Linux LVM
/dev/vda3 209715200 838860799 314572800 8e Linux LVM
Disk /dev/mapper/centos-root: 375.8 GB, 375809638400 bytes, 734003200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 4160 MB, 4160749568 bytes, 8126464 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-home: 48.4 GB, 48444211200 bytes, 94617600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
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# 8.开始分区
fdisk /dev/vda （因为我们是扩容的vda，所以在vda新增一个分区）
p查询分区
n创建分区，其他默认
p查询分区
t设置新创建的分区格式8e
p查询分区格式是否设置成功
w保存退出
执行partprobe
------------
[root@jumpserver-33 ~]# fdisk /dev/vda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/vda: 440.2 GB, 440234147840 bytes, 859832320 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a8f64
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 209715199 103808000 8e Linux LVM
/dev/vda3 209715200 838860799 314572800 8e Linux LVM
Command (m for help): n
Partition type:
p primary (3 primary, 0 extended, 1 free)
e extended
Select (default e): p
Selected partition 4
First sector (838860800-859832319, default 838860800):
Using default value 838860800
Last sector, +sectors or +size{K,M,G} (838860800-859832319, default 859832319):
Using default value 859832319
Partition 4 of type Linux and of size 10 GiB is set
Command (m for help): p
Disk /dev/vda: 440.2 GB, 440234147840 bytes, 859832320 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a8f64
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 209715199 103808000 8e Linux LVM
/dev/vda3 209715200 838860799 314572800 8e Linux LVM
/dev/vda4 838860800 859832319 10485760 83 Linux
Command (m for help): t
Partition number (1-4, default 4):
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
Disk /dev/vda: 440.2 GB, 440234147840 bytes, 859832320 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000a8f64
Device Boot Start End Blocks Id System
/dev/vda1 * 2048 2099199 1048576 83 Linux
/dev/vda2 2099200 209715199 103808000 8e Linux LVM
/dev/vda3 209715200 838860799 314572800 8e Linux LVM
/dev/vda4 838860800 859832319 10485760 8e Linux LVM
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
-------------
[root@jumpserver-33 ~]# partprobe # 更新所有硬盘的分区表
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# 9.LVM磁盘扩展
[root@jumpserver-33 ~]# partprobe
--------------------------创建物理卷
[root@jumpserver-33 ~]# pvcreate /dev/vda4
WARNING: dos signature detected on /dev/vda4 at offset 510. Wipe it? [y/n]: y
Wiping dos signature on /dev/vda4.
Physical volume "/dev/vda4" successfully created.
--------------------------查询group
[root@jumpserver-33 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 3 0 wz--n- 398.99g 0
--------------------------扩容
[root@jumpserver-33 ~]# vgextend centos /dev/vda4
Volume group "centos" successfully extended
-------------------------扩容逻辑卷大小
[root@jumpserver-33 ~]# lvextend -l +100%FREE /dev/centos/root
Size of logical volume centos/root changed from 350.00 GiB (89600 extents) to <360.00 GiB (92159 extents).
Logical volume centos/root successfully resized.
-------------------------更新修改到文件系统
[root@jumpserver-33 ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=28, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=91750400, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 91750400 to 94370816
-------------------------查询
[root@jumpserver-33 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 9.2M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 360G 9.6G 351G 3% /
/dev/vda1 1014M 143M 872M 15% /boot
/dev/mapper/centos-home 46G 41M 46G 1% /home
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上次更新: 2026/05/31, 03:30:34