Centos 根目录扩容

增加物理存储

将新扩容的100GB空间进行fdisk分区，或者直接使用pvcreate 建立物理卷

建立物理卷(可选，建议用fdisk分区)

pvcreate /dev/sdb

fdisk分区

lsblk可以看到硬盘变成300GB，但是分区还是sda1和sda2共200GB，利用fdisk对sda进行分区，将扩容空间创建为新的sda3分区

(base) [root@localhost ~]# lsblk
NAME                                                                                    MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                                                                                       8:0    0   300G  0 disk 
├─sda1                                                                                    8:1    0   500M  0 part /boot
└─sda2                                                                                    8:2    0 199.5G  0 part 
  ├─centos-root                                                                         253:0    0    50G  0 lvm  /
  ├─centos-swap                                                                         253:1    0   7.9G  0 lvm  [SWAP]
  └─centos-home                                                                         253:2    0 141.6G  0 lvm  /home
sr0                                                                                      11:0    1  1024M  0 rom  
loop0                                                                                     7:0    0   100G  0 loop 
└─docker-253:0-76908-pool                                                               253:3    0   100G  0 dm   
  ├─docker-253:0-76908-6487ee88cff7f7df32b6de854dce4a5bbf8d9be5b75d6c934b25458503954463 253:4    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/6487ee88cff7f7df32b6de854dce4a5bbf8d9be5b75d6c934b25458503954463
  ├─docker-253:0-76908-b1b6f8238658349512a27061fc1ccaa59fdbcf9244c7319f7d98b8dd39231c68 253:5    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/b1b6f8238658349512a27061fc1ccaa59fdbcf9244c7319f7d98b8dd39231c68
  └─docker-253:0-76908-9b2576df31fd36f7c031fbf7a11ff02f508d8e51cf8c8e1f18f2a86fe0fdf42c 253:6    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/9b2576df31fd36f7c031fbf7a11ff02f508d8e51cf8c8e1f18f2a86fe0fdf42c
loop1                                                                                     7:1    0     2G  0 loop 
└─docker-253:0-76908-pool                                                               253:3    0   100G  0 dm   
  ├─docker-253:0-76908-6487ee88cff7f7df32b6de854dce4a5bbf8d9be5b75d6c934b25458503954463 253:4    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/6487ee88cff7f7df32b6de854dce4a5bbf8d9be5b75d6c934b25458503954463
  ├─docker-253:0-76908-b1b6f8238658349512a27061fc1ccaa59fdbcf9244c7319f7d98b8dd39231c68 253:5    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/b1b6f8238658349512a27061fc1ccaa59fdbcf9244c7319f7d98b8dd39231c68
  └─docker-253:0-76908-9b2576df31fd36f7c031fbf7a11ff02f508d8e51cf8c8e1f18f2a86fe0fdf42c 253:6    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/9b2576df31fd36f7c031fbf7a11ff02f508d8e51cf8c8e1f18f2a86fe0fdf42c

(base) [root@localhost ~]# fdisk /dev/sda
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/sda: 322.1 GB, 322122547200 bytes, 629145600 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: 0x000696e6

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048   419430399   209202176   8e  Linux LVM

Command (m for help): n
Partition t