KVM虚拟机根目录扩容

# 1. 虚拟机查看磁盘

[root@k8s-node02 ~] lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0  200G  0 disk
├─sda2            8:2    0  199G  0 part
│ ├─centos-opt  253:1    0  130G  0 lvm  /opt
│ └─centos-root 253:0    0   69G  0 lvm  /
└─sda1            8:1    0    1G  0 part /boot

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# 2. 宿主机执行命令

# 2.1 创建磁盘

qemu-img create -f qcow2 /vm/expand-disk/k8s-node02-data.img 100G

# 2.2 将磁盘添加到虚拟机

virsh attach-disk k8s-node02-33.222 --source /vm/expand-disk/k8s-node02-data.img --target sdc --subdriver qcow2 --persistent

# 3. 虚拟机执行命令

# 3.1 查看磁盘

[root@k8s-node02 ~] lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdb               8:16   0  100G  0 disk
sda               8:0    0  200G  0 disk
├─sda2            8:2    0  199G  0 part
│ ├─centos-opt  253:1    0  130G  0 lvm  /opt
│ └─centos-root 253:0    0   69G  0 lvm  /
└─sda1            8:1    0    1G  0 part /boot

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# 3.2 磁盘进行分区

fdisk /dev/sdb

# 3.3 分区查看

[root@k8s-node02 ~] lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdb               8:16   0  100G  0 disk
└─sdb1            8:17   0  100G  0 part
sda               8:0    0  200G  0 disk
├─sda2            8:2    0  199G  0 part
│ ├─centos-opt  253:1    0  130G  0 lvm  /opt
│ └─centos-root 253:0    0   69G  0 lvm  /
└─sda1            8:1    0    1G  0 part /boot

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# 3.4 查看物理卷信息

[root@k8s-node02 ~] pvdisplay
  --- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <199.00 GiB
  PE Size               4.00 MiB
  Total PE              50943
  Alloc PE / Size       50943 / <199.00 GiB
  Free  PE / Size       0 / 0
  VG UUID               wqewxG-dg2m-fV5N-efXg-VlH5-hcoQ-M6yplI

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# 3.5 扩展卷组

vgextend centos /dev/sdb1

# 3.6 再次查看卷组信息

[root@k8s-node02 ~] vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               298.99 GiB
  PE Size               4.00 MiB
  Total PE              76542
  Alloc PE / Size       50943 / <199.00 GiB
  Free  PE / Size       25599 / <100.00 GiB
  VG UUID               wqewxG-dg2m-fV5N-efXg-VlH5-hcoQ-M6yplI

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# 3.7 查看逻辑卷属性

[root@k8s-node02 ~] lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/opt
  LV Name                opt
  VG Name                centos
  LV UUID                sVxfDn-pquv-A3Zq-9N6E-HnFa-7upm-0s0s2T
  LV Write Access        read/write
  LV Creation host, time localhost, 2021-03-12 13:10:11 +0800
  LV Status              available
  open                 1
  LV Size                130.00 GiB
  Current LE             33280
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                rm4gNM-1W5R-jXnc-QxMk-WB2t-fqMI-svFwlK
  LV Write Access        read/write
  LV Creation host, time localhost, 2021-03-12 13:10:13 +0800
  LV Status              available
  open                 1
  LV Size                <69.00 GiB
  Current LE             17663
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

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# 3.8 将目前磁盘未分配的空间全部扩展到 /dev/centos/root 分区下

lvextend -l +100%FREE /dev/centos/root

# 3.9 查看逻辑卷属性

[root@k8s-node02 ~] lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/opt
  LV Name                opt
  VG Name                centos
  LV UUID                sVxfDn-pquv-A3Zq-9N6E-HnFa-7upm-0s0s2T
  LV Write Access        read/write
  LV Creation host, time localhost, 2021-03-12 13:10:11 +0800
  LV Status              available
  open                 1
  LV Size                130.00 GiB
  Current LE             33280
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                rm4gNM-1W5R-jXnc-QxMk-WB2t-fqMI-svFwlK
  LV Write Access        read/write
  LV Creation host, time localhost, 2021-03-12 13:10:13 +0800
  LV Status              available
  open                 1
  LV Size                168.99 GiB
  Current LE             43262
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

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# 3.10 重新识别分区大小

xfs_growfs /dev/centos/root

#linux

上次更新: 2026/05/31, 03:30:34

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