centos7 根目录扩容(xfs无lvm)

现状：
centos 7，/对应分区为xfs格式，且无lvm。
只有一个分区，大小40GB，而整个磁盘大小200GB。

目标：
将剩余磁盘空间都分配给当前分区。基本步骤为先调整分区大小，再调整mount的/的大小。

• 查看当前/分区文件系统为xfs，大小40GB

  [root@hgcndn ~]# df -Th
  Filesystem     Type      Size  Used Avail Use% Mounted on
  devtmpfs       devtmpfs  489M     0  489M   0% /dev
  tmpfs          tmpfs     496M  8.0K  496M   1% /dev/shm
  tmpfs          tmpfs     496M   38M  458M   8% /run
  tmpfs          tmpfs     496M     0  496M   0% /sys/fs/cgroup
  /dev/sda1      xfs        40G   40G  585M  99% /
  tmpfs          tmpfs     100M     0  100M   0% /run/user/1001
  vagrant        vboxsf    376G  157G  220G  42% /vagrant
  vagrant_data   vboxsf    376G  157G  220G  42% /vagrant_data
  tmpfs          tmpfs     100M     0  100M   0% /run/user/1000

• 查看当前分区信息

  [root@hgcndn ~]# lsblk
  NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
  sda      8:0    0  200G  0 disk
  └─sda1   8:1    0   40G  0 part /
  
  [root@hgcndn ~]# fdisk -l /dev/sda
  
  Disk /dev/sda: 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: 0x0009ef1a
  
   Device Boot      Start         End      Blocks   Id  System
  /dev/sda1   *        2048    83886079    41942016   83  Linux
  

• 安装需要的工具

  yum install cloud-utils-growpart gdisk -y

• growpart重写分区表，调整分区大小，1为分区号，如果扩容sd2，则为2

  [root@hgcndn ~]# growpart /dev/sda 1
  CHANGED: partition=1 start=2048 old: size=83884032 end=83886080 new: size=419428319 end=419430367

• 确认分区大小已经调整为200GB

  [root@hgcndn ~]# lsblk
  NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
  sda      8:0    0  200G  0 disk
  └─sda1   8:1    0  200G  0 part /

• xfs_growfs 扩容 /

  [root@hgcndn ~]# xfs_growfs /
  meta-data=/dev/sda1              isize=512    agcount=4, agsize=2621376 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
  data     =                       bsize=4096   blocks=10485504, imaxpct=25
         =                       sunit=0      swidth=0 blks
  naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
  log      =internal               bsize=4096   blocks=5119, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
  realtime =none                   extsz=4096   blocks=0, rtextents=0
  data blocks changed from 10485504 to 52428539

• 确认/扩容为200GB

  [root@hgcndn ~]# df -Th
  Filesystem     Type      Size  Used Avail Use% Mounted on
  devtmpfs       devtmpfs  489M     0  489M   0% /dev
  tmpfs          tmpfs     496M  8.0K  496M   1% /dev/shm
  tmpfs          tmpfs     496M   38M  458M   8% /run
  tmpfs          tmpfs     496M     0  496M   0% /sys/fs/cgroup
  /dev/sda1      xfs       200G   40G  161G  20% /
  tmpfs          tmpfs     100M     0  100M   0% /run/user/1001
  vagrant        vboxsf    376G  157G  219G  42% /vagrant
  vagrant_data   vboxsf    376G  157G  219G  42% /vagrant_data
  tmpfs          tmpfs     100M     0  100M   0% /run/user/1000