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fedora 23 lvm2Format: Insufficient Disk Space in Root Directory, Expansion Method

Successfully moved the root directory from2扩容到0G47Record the steps below:

The format is lvm2

$ df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 5.7G     0  5.7G   0% /dev
tmpfs                    5.7G   26M  5.7G   1% /dev/shm
tmpfs                    5.7G  1.5M  5.7G   1% /run
tmpfs                    5.7G     0  5.7G   0% /sys/fs/cgroup
/dev/mapper/fedora-root   <span style="color:#ff0000;">47</span>G   15G   30G  34% /
tmpfs                    5.7G   68K  5.7G   1% /tmp
/dev/sda5                488M  236M  218M  52% /boot
tmpfs                    1.2G  4.0K  1.2G   1% /run/user/971
/dev/mapper/fedora-home  <span style="color:#ff0000;">197</span>G   47G  141G  25% /home
tmpfs                    1.2G   16K  1.2G   1% /run/user/1000

$ vgdisplay
  --- Volume group ---
  VG Name               fedora
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               318.77 GiB
  PE Size               4.00 MiB
  Total PE              81606
  Alloc PE / Size       81605 / 318.77 GiB
  Free  PE / Size       1 / 4.00 MiB
  VG UUID               XckxJ7-6CfX-zxJi-zoUq-xBOK-epVz-BQk1Ss

1.  Cut a piece of space from other directories, I am cutting from/home cut out27G

umount -v /home   #Unmount, must
e2fsck -ff  /dev/mapper/fedora-home  #Here is to check the disk5steps must all pass
resize2fs /dev/mapper/fedora-home  197G  #Here197G refers to the remaining space size
lvreduce -L -27G /dev/mapper/fedora-home  #Here27G refers to the size of the cut space
mount -v /home # Remount

2Add the space cut from elsewhere to the root directory

lvextend -L+27G /dev/mapper/fedora-root #27G added to the root directory
resize2fs /dev/mapper/fedora-root # Take effect

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