KVM虚拟机根分区磁盘扩容

CentOS7.6, libvirt 4.5.0 , KVM虚拟机根分区扩容.

在宿主机执行0, 对LVM磁盘进行扩容

0. qemu-img resize 10.0.0.1_node1.qcow2 +50G

剩下步骤均在虚拟机上执行

1. [root@localhost ~]# fdisk /dev/vda

对vda重新分区, 选择主分区p, 分区号按默认, 柱面按默认, 最后w写入即可, 重启后生效.

2. [root@localhost ~]# reboot

3. [root@localhost ~]# pvcreate /dev/vda3

4. [root@localhost ~]# vgextend centos /dev/vda3

5. [root@localhost ~]# lvextend -l +100%FREE /dev/centos/root

6. [root@localhost ~]# xfs_growfs /dev/centos/root

[root@localhost ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0              11:0    1 1024M  0 rom
vda             252:0    0  100G  0 disk
├─vda1          252:1    0    1G  0 part /boot
└─vda2          252:2    0   49G  0 part
  ├─centos-root 253:0    0 45.1G  0 lvm  /
  └─centos-swap 253:1    0  3.9G  0 lvm  [SWAP]
[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 1.9G     0  1.9G   0% /dev
tmpfs                    1.9G     0  1.9G   0% /dev/shm
tmpfs                    1.9G  8.6M  1.9G   1% /run
tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root   46G   19G   27G  42% /
/dev/vda1               1014M  231M  783M  23% /boot
tmpfs                    379M     0  379M   0% /run/user/0
[root@localhost ~]# fdisk -l

Disk /dev/vda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000ae274

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     2099199     1048576   83  Linux
/dev/vda2         2099200   104857599    51379200   8e  Linux LVM

Disk /dev/mapper/centos-root: 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

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

[root@localhost ~]# 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: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000ae274

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     2099199     1048576   83  Linux
/dev/vda2         2099200   104857599    51379200   8e  Linux LVM

Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
Select (default p): p
Partition number (3,4, default 3):
First sector (104857600-209715199, default 104857600):
Using default value 104857600
Last sector, +sectors or +size{K,M,G} (104857600-209715199, default 209715199):
Using default value 209715199
Partition 3 of type Linux and of size 50 GiB is set

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@localhost ~]# fdisk -l

Disk /dev/vda: 107.4 GB, 107374182400 bytes, 209715200 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: 0x000ae274

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     2099199     1048576   83  Linux
/dev/vda2         2099200   104857599    51379200   8e  Linux LVM
/dev/vda3       104857600   209715199    52428800   83  Linux

Disk /dev/mapper/centos-root: 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

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

[root@localhost ~]# reboot
[root@localhost ~]# pvcreate /dev/vda3
  Physical volume "/dev/vda3" successfully created.
[root@localhost ~]# pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/vda2  centos lvm2 a--  <49.00g  4.00m
  /dev/vda3         lvm2 ---   50.00g 50.00g

[root@localhost ~]# vgextend centos /dev/vda3
  Volume group "centos" successfully extended
[root@localhost ~]# lvextend -h
  lvextend - Add space to a logical volume

  Extend an LV by a specified size.
  lvextend -L|--size [+]Size[m|UNIT] LV
        [ -l|--extents [+]Number[PERCENT] ]
        [ -r|--resizefs ]
        [ -i|--stripes Number ]
        [ -I|--stripesize Size[k|UNIT] ]
        [    --poolmetadatasize [+]Size[m|UNIT] ]
        [ COMMON_OPTIONS ]
        [ PV ... ]

  Extend an LV by specified PV extents.
  lvextend LV PV ...
        [ -r|--resizefs ]
        [ -i|--stripes Number ]
        [ -I|--stripesize Size[k|UNIT] ]
        [ COMMON_OPTIONS ]

  Extend a pool metadata SubLV by a specified size.
  lvextend --poolmetadatasize [+]Size[m|UNIT] LV_thinpool
        [ -i|--stripes Number ]
        [ -I|--stripesize Size[k|UNIT] ]
        [ COMMON_OPTIONS ]
        [ PV ... ]

  Extend an LV according to a predefined policy.
  lvextend --usepolicies LV_snapshot_thinpool
        [ -r|--resizefs ]
        [ COMMON_OPTIONS ]
        [ PV ... ]

  Common options for command:
        [ -A|--autobackup y|n ]
        [ -f|--force ]
        [ -m|--mirrors Number ]
        [ -n|--nofsck ]
        [    --alloc contiguous|cling|cling_by_tags|normal|anywhere|inherit ]
        [    --nosync ]
        [    --noudevsync ]
        [    --reportformat basic|json ]
        [    --type linear|striped|snapshot|mirror|raid|thin|cache|thin-pool|cache-pool ]

  Common options for lvm:
        [ -d|--debug ]
        [ -h|--help ]
        [ -q|--quiet ]
        [ -v|--verbose ]
        [ -y|--yes ]
        [ -t|--test ]
        [    --commandprofile String ]
        [    --config String ]
        [    --driverloaded y|n ]
        [    --lockopt String ]
        [    --longhelp ]
        [    --profile String ]
        [    --version ]

  Use --longhelp to show all options and advanced commands.

[root@localhost ~]# lvextend -l +100%FREE /dev/centos/root
  Size of logical volume centos/root changed from <45.12 GiB (11550 extents) to <95.12 GiB (24350 extents).
  Logical volume centos/root successfully resized.

[root@localhost ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=2956800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=11827200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=5775, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 11827200 to 24934400
[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 1.9G     0  1.9G   0% /dev
tmpfs                    1.9G     0  1.9G   0% /dev/shm
tmpfs                    1.9G  8.7M  1.9G   1% /run
tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/mapper/centos-root   96G   19G   77G  20% /
/dev/vda1               1014M  231M  783M  23% /boot
tmpfs                    379M     0  379M   0% /run/user/0