centos7.5在proxmox5.3上磁盘扩容

该方式同样适用于其它类型的磁盘扩容，前提是你的磁盘格式是LVM

1. 首先在 Proxmox 5.3 Web页面“调整磁盘大小”，

2. 登陆到虚拟机

[root@c720176 ~]# fdisk -l

Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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: 0x000bbf54

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    20971519     9436160   8e  Linux LVM

Disk /dev/mapper/centos-root: 8585 MB, 8585740288 bytes, 16769024 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: 1073 MB, 1073741824 bytes, 2097152 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@c720176 ~]# fdisk /dev/sda
p               // 打印分区表
n               // 新建分区
p               // 新建主分区
回车            // 分区号码，保持默认即可
回车            // 开启扇区位置
回车            // 结束扇区位置
p              // 打印分区表
t              // 修改分区类型
回车           // 默认选择最后一个分区
8e             // lvm类型
p              // 打印分区表
w              // 写入

// 创建 pv
[root@c720177 ~]# reboot         // 重启
[root@c720177 ~]# pvcreate /dev/sda3
[root@c720177 ~]# vgdisplay 
  --- 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               <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               tg47CY-frFO-kSKe-AGk5-ygQ9-4yqp-1isPvj

// 扩展vg
[root@c720177 ~]# vgextend centos /dev/sda3
  Volume group "centos" successfully extended
[root@c720177 ~]# 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               78.99 GiB
  PE Size               4.00 MiB
  Total PE              20222
  Alloc PE / Size       2303 / <9.00 GiB
  Free  PE / Size       17919 / <70.00 GiB
  VG UUID               tg47CY-frFO-kSKe-AGk5-ygQ9-4yqp-1isPvj

// 扩展 LV
[root@c720177 ~]# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                p56QTa-M2Wm-bTgH-oOwk-0AiZ-lBly-NmQST8
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-01-02 21:48:14 +0800
  LV Status              available
  # open                 2
  LV Size                1.00 GiB
  Current LE             256
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                NdxCMw-ZiFz-C1fz-ECLz-0jXc-z59f-9UpBG0
  LV Write Access        read/write
  LV Creation host, time localhost, 2019-01-02 21:48:15 +0800
  LV Status              available
  # open                 1
  LV Size                <8.00 GiB
  Current LE             2047
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0

[root@c720177 ~]# lvextend -l +99%FREE /dev/centos/root
  Size of logical volume centos/root changed from <8.00 GiB (2047 extents) to 77.29 GiB (19787 extents).
  Logical volume centos/root successfully resized.

// 重新读取磁盘分区
[root@c720177 ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  8.0G  1.1G  7.0G  14% /
devtmpfs                 1.9G     0  1.9G   0% /dev
tmpfs                    1.9G     0  1.9G   0% /dev/shm
tmpfs                    1.9G  8.5M  1.9G   1% /run
tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda1               1014M  142M  873M  14% /boot
tmpfs                    379M     0  379M   0% /run/user/56361

[root@c720177 ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=524032 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=2096128, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 2096128 to 20261888

[root@c720177 ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   78G  1.1G   77G   2% /
devtmpfs                 1.9G     0  1.9G   0% /dev
tmpfs                    1.9G     0  1.9G   0% /dev/shm
tmpfs                    1.9G  8.5M  1.9G   1% /run
tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
/dev/sda1               1014M  142M  873M  14% /boot
tmpfs                    379M     0  379M   0% /run/user/56361