为 linux 下 lvm 扩容

linux 是运行在 vmware 上的，目前需要给根目录加 10G 的空间，在 vmware 上划出了 10G 空间后，需要手动加到 linux 上

1. 查看磁盘状况，根目录是挂载到 /dev/mapper/ubuntu--vg-ubuntu--lv

root@RADIUS-214:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               463M     0  463M   0% /dev
tmpfs                               99M  1.2M   98M   2% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   19G  4.4G   14G  25% /
tmpfs                              493M     0  493M   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
tmpfs                              493M     0  493M   0% /sys/fs/cgroup
/dev/loop0                          89M   89M     0 100% /snap/core/7270
/dev/sda2                          976M   77M  833M   9% /boot
tmpfs                               99M     0   99M   0% /run/user/0

1. 查看系统 pv，可以看到 vmware 中新加了 10G的 volumn，/dev/sda4

root@RADIUS-214:~# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               ubuntu-vg
  PV Size               <9.00 GiB / not usable 0   

  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              2303
  Free PE               0
  Allocated PE          2303
  PV UUID               1Bdm0U-NdiH-3ZCo-cWq1-Vuke-qRjn-xK0knF

  --- Physical volume ---
  PV Name               /dev/sda4
  VG Name               ubuntu-vg
  PV Size               10.00 GiB / not usable 4.98 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              2559
  Free PE               3
  Allocated PE          2556
  PV UUID               5MM1Ue-JdRm-hXm9-1koa-oIyg-jNA6-9RSxu2

1. 查看分区信息

root@RADIUS-214:~# parted -ls
Model: ATA VMware Virtual I (scsi)
Disk /dev/sda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  2097kB  1049kB                     bios_grub
 2      2097kB  1076MB  1074MB  ext4
 3      1076MB  10.7GB  9661MB
 4      10.7GB  21.5GB  10.7GB  ext4


Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 9659MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags: 

Number  Start  End     Size    File system  Flags
 1      0.00B  9659MB  9659MB  ext4

1. 查看 vg 信息，留意 VG Name

root@RADIUS-214:~# vgdisplay
  --- Volume group ---
  VG Name               ubuntu-vg
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <9.00 GiB
  PE Size               4.00 MiB
  Total PE              2303
  Alloc PE / Size       2303 / <9.00 GiB
  Free  PE / Size       0 / 0   
  VG UUID               xNNYJx-o0yv-zK9I-A1lt-TwvG-BMs9-hWRtQa

1. 扩展卷组，将 /dev/sda4 物理卷添加到 VG 卷组中

root@RADIUS-214:~# vgextend ubuntu-vg /dev/sda4 
WARNING: ext4 signature detected on /dev/sda4 at offset 1080. Wipe it? [y/n]: y
  Wiping ext4 signature on /dev/sda4.
  Physical volume "/dev/sda4" successfully created.
  Volume group "ubuntu-vg" successfully extended

1. 将新的空间划入到分区中

lvextend -L +10G /dev/ubuntu-vg/ubuntu-lv

1. 重新计算空间

root@RADIUS-214:~# resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
resize2fs 1.44.1 (24-Mar-2018)
Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required
old_desc_blocks = 3, new_desc_blocks = 3
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 4977664 (4k) blocks long.

1. 查看磁盘信息
   可以看到，磁盘已经扩容了 10G 空间，而且无需重启系统。

root@RADIUS-214:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               463M     0  463M   0% /dev
tmpfs                               99M  1.2M   98M   2% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   19G  4.4G   14G  25% /
tmpfs                              493M     0  493M   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
tmpfs                              493M     0  493M   0% /sys/fs/cgroup
/dev/loop0                          89M   89M     0 100% /snap/core/7270
/dev/sda2                          976M   77M  833M   9% /boot
tmpfs                               99M     0   99M   0% /run/user/0