Centos7扩容

1. 保证虚拟机关机且没有快照的情况下按照下图进行操作：

   

2. 设置好后开机，查看分区情况：

   [root@localhost ~]# df -h
   Filesystem               Size  Used Avail Use% Mounted on
   /dev/mapper/centos-root   17G   12G  5.4G  69% /
   devtmpfs                 901M     0  901M   0% /dev
   tmpfs                    912M     0  912M   0% /dev/shm
   tmpfs                    912M  8.7M  903M   1% /run
   tmpfs                    912M     0  912M   0% /sys/fs/cgroup
   /dev/sda1               1014M  143M  872M  15% /boot
   tmpfs                    183M     0  183M   0% /run/user/1000
   tmpfs                    183M     0  183M   0% /run/user/0
   [root@localhost ~]# lsblk
   NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
   sda               8:0    0   50G  0 disk
   ├─sda1            8:1    0    1G  0 part /boot
   └─sda2            8:2    0   19G  0 part├─centos-root 253:0    0   17G  0 lvm  /└─centos-swap 253:1    0    2G  0 lvm  [SWAP]
   sr0              11:0    1  792M  0 rom
   [root@localhost ~]#
   

3. 新建分区，并将id改为8e

[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): 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 (41943040-104857599, default 41943040):
Using default value 41943040
Last sector, +sectors or +size{K,M,G} (41943040-104857599, default 104857599):
Using default value 104857599
Partition 3 of type Linux and of size 30 GiB is setCommand (m for help): pDisk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 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: 0x0009b29bDevice Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    41943039    19921920   8e  Linux LVM
/dev/sda3        41943040   104857599    31457280   83  LinuxCommand (m for help): t
Partition number (1-3, default 3): l
Partition number (1-3, default 3):
Hex code (type L to list all codes): l0  Empty           24  NEC DOS         81  Minix / old Lin bf  Solaris1  FAT12           27  Hidden NTFS Win 82  Linux swap / So c1  DRDOS/sec (FAT-2  XENIX root      39  Plan 9          83  Linux           c4  DRDOS/sec (FAT-3  XENIX usr       3c  PartitionMagic  84  OS/2 hidden C:  c6  DRDOS/sec (FAT-4  FAT16 <32M      40  Venix 80286     85  Linux extended  c7  Syrinx5  Extended        41  PPC PReP Boot   86  NTFS volume set da  Non-FS data6  FAT16           42  SFS             87  NTFS volume set db  CP/M / CTOS / .7  HPFS/NTFS/exFAT 4d  QNX4.x          88  Linux plaintext de  Dell Utility8  AIX             4e  QNX4.x 2nd part 8e  Linux LVM       df  BootIt9  AIX bootable    4f  QNX4.x 3rd part 93  Amoeba          e1  DOS accessa  OS/2 Boot Manag 50  OnTrack DM      94  Amoeba BBT      e3  DOS R/Ob  W95 FAT32       51  OnTrack DM6 Aux 9f  BSD/OS          e4  SpeedStorc  W95 FAT32 (LBA) 52  CP/M            a0  IBM Thinkpad hi eb  BeOS fse  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a5  FreeBSD         ee  GPTf  W95 Ext'd (LBA) 54  OnTrackDM6      a6  OpenBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a7  NeXTSTEP        f0  Linux/PA-RISC b
11  Hidden FAT12    56  Golden Bow      a8  Darwin UFS      f1  SpeedStor
12  Compaq diagnost 5c  Priam Edisk     a9  NetBSD          f4  SpeedStor
14  Hidden FAT16 <3 61  SpeedStor       ab  Darwin boot     f2  DOS secondary
16  Hidden FAT16    63  GNU HURD or Sys af  HFS / HFS+      fb  VMware VMFS
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep
1c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT
1e  Hidden W95 FAT1 80  Old Minix
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'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. 查看sda3是否存在

[root@localhost ~]# lsblk
NAME            MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda               8:0    0   50G  0 disk
├─sda1            8:1    0    1G  0 part /boot
├─sda2            8:2    0   19G  0 part
│ ├─centos-root 253:0    0   17G  0 lvm  /
│ └─centos-swap 253:1    0    2G  0 lvm  [SWAP]
└─sda3            8:3    0   30G  0 part
sr0              11:0    1  792M  0 rom
[root@localhost ~]#

5. 使用lvm命令新建卷/dev/sda3,并将其加载到卷组centos中

[root@localhost ~]# lvm
lvm> pvcreate /dev/sda3Physical volume "/dev/sda3" successfully created.
lvm> pvdisplay--- Physical volume ---PV Name               /dev/sda2VG Name               centosPV Size               <19.00 GiB / not usable 3.00 MiBAllocatable           yes (but full)PE Size               4.00 MiBTotal PE              4863Free PE               0Allocated PE          4863PV UUID               b38Zdi-fdFl-E12C-ZLHj-G3SN-BBqv-MKybr0"/dev/sda3" is a new physical volume of "30.00 GiB"--- NEW Physical volume ---PV Name               /dev/sda3VG NamePV Size               30.00 GiBAllocatable           NOPE Size               0Total PE              0Free PE               0Allocated PE          0PV UUID               sF8pQr-b8yy-kBL0-afqe-Jj4z-UYCa-JLqxvylvm> vgdisplay--- Volume group ---VG Name               centosSystem IDFormat                lvm2Metadata Areas        1Metadata Sequence No  3VG Access             read/writeVG Status             resizableMAX LV                0Cur LV                2Open LV               2Max PV                0Cur PV                1Act PV                1VG Size               <19.00 GiBPE Size               4.00 MiBTotal PE              4863Alloc PE / Size       4863 / <19.00 GiBFree  PE / Size       0 / 0VG UUID               SLf1Z5-hZG3-Z6y8-Mc25-Ofxi-uLVe-0irckqlvm> vgextend centos /dev/sda3Volume group "centos" successfully extended
lvm> vgdisplay--- Volume group ---VG Name               centosSystem IDFormat                lvm2Metadata Areas        2Metadata Sequence No  4VG Access             read/writeVG Status             resizableMAX LV                0Cur LV                2Open LV               2Max PV                0Cur PV                2Act PV                2VG Size               48.99 GiBPE Size               4.00 MiBTotal PE              12542Alloc PE / Size       4863 / <19.00 GiBFree  PE / Size       7679 / <30.00 GiBVG UUID               SLf1Z5-hZG3-Z6y8-Mc25-Ofxi-uLVe-0irckqlvm> lvextend -l +100%FREE /dev/centos/rootSize of logical volume centos/root changed from <17.00 GiB (4351 extents) to 46.99 GiB (12030 extents).Logical volume centos/root successfully resized.
lvm> exitExiting.
[root@localhost ~]#

6. 同步到文件系统，对根目录的扩容

[root@localhost ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=1113856 blks=                       sectsz=512   attr=2, projid32bit=1=                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4455424, 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 4455424 to 12318720

7. 查看扩容是否成功

[root@localhost ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   47G   12G   36G  25% /
devtmpfs                 901M     0  901M   0% /dev
tmpfs                    912M     0  912M   0% /dev/shm
tmpfs                    912M  8.7M  903M   1% /run
tmpfs                    912M     0  912M   0% /sys/fs/cgroup
/dev/sda1               1014M  143M  872M  15% /boot
tmpfs                    183M     0  183M   0% /run/user/1000
tmpfs                    183M     0  183M   0% /run/user/0
[root@localhost ~]#