虚拟化下Centos7 扩容根分区

1. 查看分区大小和挂载情况 用到的命令df、lsblk

[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   99G   96G  3.9G  97% /
devtmpfs                 3.8G     0  3.8G   0% /dev
tmpfs                    3.9G   33M  3.8G   1% /dev/shm
tmpfs                    3.9G   27M  3.8G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/vda1               1014M  189M  826M  19% /boot
tmpfs                    6.4G     0  6.4G   0% /run/user/0
[root@localhost ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
fd0               2:0    1    4K  0 disk 
sr0              11:0    1 1024M  0 rom  
vda             252:0    0  200G  0 disk 
├─vda1          252:1    0    1G  0 part /boot
└─vda2          252:2    0   99G  0 part 
  └─centos-root 253:0    0   99G  0 lvm  /

2. 又原来的100G 调整虚拟机磁盘为200G 直接调整。

3. 创建分区

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: 214.7 GB, 214748364800 bytes, 419430400 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: 0x000a727a

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     2099199     1048576   83  Linux
/dev/vda2         2099200   209715199   103808000   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): 3
First sector (209715200-419430399, default 209715200): 
Using default value 209715200
Last sector, +sectors or +size{K,M,G} (209715200-419430399, default 419430399): 
Using default value 419430399
Partition 3 of type Linux and of size 100 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 ~]#

4. 刷新分区并创建物理卷

[root@localhost ~]# partprobe /dev/vda
[root@localhost ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
fd0               2:0    1    4K  0 disk 
sr0              11:0    1 1024M  0 rom  
vda             252:0    0  200G  0 disk 
├─vda1          252:1    0    1G  0 part /boot
├─vda2          252:2    0   99G  0 part 
│ └─centos-root 253:0    0   99G  0 lvm  /
└─vda3          252:3    0  100G  0 part 
[root@localhost ~]# partprobe /dev/vda3

5. 查看卷组名称，以及卷组使用情况

[root@localhost ~]# vgdisplay 
  --- Volume group ---
  VG Name               centos
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  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               <99.00 GiB
  PE Size               4.00 MiB
  Total PE              25343
  Alloc PE / Size       25343 / <99.00 GiB
  Free  PE / Size       0 / 0   
  VG UUID               wEdhD1-PJnZ-gSBB-ZE4X-pMKK-Obor-b7JnO2

6.扩展卷组

[root@localhost ~]# vgextend centos /dev/vda3
  Physical volume "/dev/vda3" successfully created.
  Volume group "centos" successfully extended

7.查看当前逻辑卷

[root@localhost ~]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                q9mens-Ujcs-Kgzq-Gbtd-gEdF-D6x7-Oa3GmP
  LV Write Access        read/write
  LV Creation host, time localhost, 2020-01-13 11:17:40 +0800
  LV Status              available
  # open                 1
  LV Size                <99.00 GiB
  Current LE             25343
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0

8.将“VG Name centos”卷组中的空闲空间扩展到根分区逻辑卷

[root@localhost ~]# lvextend -l +100%FREE /dev/centos/root
  Size of logical volume centos/root changed from <99.00 GiB (25343 extents) to 198.99 GiB (50942 extents).
  Logical volume centos/root successfully resized.

9.刷新根分区

[root@localhost ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=6487808 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=25951232, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=12671, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 25951232 to 52164608