如图可以看到该设备的home目录无法正常打开
重启也没用。
这种情况怎么办呢？
首先，修改 /etc/fstab启动项
[root@localhost etc]# cat fstab
#
# /etc/fstab
# Created by anaconda on Tue May 15 09:50:29 2018
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root / xfs defaults 0 0
UUID=05676057-b13e-4d73-ba1a-2d1f2d277e5e /boot xfs defaults 0 0
/dev/mapper/centos-home /home xfs defaults 0 0
/dev/mapper/centos-swap swap swap defaults 0 0将挂载home目录的命令注释掉
然后开始格式化home目录
#df -h //查看磁盘使用情况，逻辑卷的挂载格式为/dev/mapper/VolumeGroupName-LogicalVolumeName
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 4.8G 46G 10% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 140K 3.9G 1% /dev/shm
tmpfs 3.9G 8.9M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/mapper/centos-home 873G 12G 862G 2% /home
/dev/sda1 494M 133M 362M 27% /boot#cat /etc/fstab
/dev/mapper/centos-root / xfs defaults 0 0
UUID=6abe266a-12fe-4361-9417-8d317bc25c8d /boot xfs defaults 0 0
/dev/mapper/centos-home /home xfs defaults 0 0
/dev/mapper/centos-swap swap swap defaults 0 0#vgdisplay //查看逻辑卷组情况
--- Volume group ---
VG Name centos
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 931.02 GiB
PE Size 4.00 MiB
Total PE 238341
Alloc PE / Size 238325 / 930.96 GiB
Free PE / Size 16 / 64.00 MiB
VG UUID IFQnYm-fCLh-38mD-Duid-nYXQ-qktX-3F1atk#lvdisplay //查看逻辑卷情况，默认三个，root、home和交换空间swap
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID FGrPuO-2T02-1OfG-0dcz-oVTy-qcsh-IxEmd4
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:00 +0800
LV Status available
# open 2
LV Size 7.75 GiB
Current LE 1984
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID x7Oh0t-6R1x-ey7G-G5OX-PnBO-VI0C-kcRuvO
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:01 +0800
LV Status available
# open 1
LV Size 873.21 GiB
Current LE 223541
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID PgscNL-rvyY-21Z1-tVe3-80vC-ONCw-VlvmYs
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:04 +0800
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0备份/home中的用户数据
[root@localhost /]# mkdir /backup && mv /home/* /backup
[root@localhost /]# ls /home/
卸载这个/home并删除逻辑卷home
#umount /home
df -h //查看磁盘情况
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 17G 34G 33% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 84K 3.9G 1% /dev/shm
tmpfs 3.9G 9.0M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 494M 133M 362M 27% /boot#lvremove /dev/centos/home //删除逻辑卷home
Do you really want to remove active logical volume home? [y/n]: y
Logical volume "home" successfully removed#vgdisplay //查看卷组可用空间
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 7
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 931.02 GiB
PE Size 4.00 MiB
Total PE 238341
Alloc PE / Size 14784 / 57.75 GiB
Free PE / Size 223557 / 873.27 GiB
VG UUID IFQnYm-fCLh-38mD-Duid-nYXQ-qktX-3F1atk这里注意，Free PE / Size 中显示的空间为卷组的空闲空间873G，之前为64M，也就是刚才删除的逻辑卷home所占用的空间，我们就从这个当中拿出一部分比如50G作为home
新建一个卷home，fdisk格式化为8e格式，文件系统还是搞为xfs（同样挂载到/home）
#lvcreate -L 50G -n home centos //L表示大小，默认单位为M；n表示卷名；这里的centos是CentOS7安装系统的时候就默认建立好的卷组名
WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/centos/home.
Logical volume "home" created.#lvdisplay //查看逻辑卷home
--- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID b5lLlv-FQPY-dT43-SmzV-sSLA-4QqP-gdQqAP
LV Write Access read/write
LV Creation host, time localhost, 2015-11-13 14:05:06 +0800
LV Status available
# open 0
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2#vgdisplay //再次查看卷组空间大小
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 931.02 GiB
PE Size 4.00 MiB
Total PE 238341
Alloc PE / Size 27584 / 107.75 GiB
Free PE / Size 210757 / 823.27 GiB
VG UUID IFQnYm-fCLh-38mD-Duid-nYXQ-qktX-3F1atk[# vgchange -ay centos //可选步骤：激活卷组centos，使得这个新建的home逻辑卷生效（用vgchange而不用lvchange）]
3 logical volume(s) in volume group “centos” now active
#mkfs -t xfs /dev/centos/home //在新建的逻辑卷home上建立xfs文件系统
meta-data=/dev/centos/home isize=256 agcount=4, agsize=3276800 blks
= sectsz=4096 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=6400, version=2
= sectsz=4096 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0#mount /dev/centos/home /home/ //把这个新逻辑卷home挂到之前的文件夹/home中去，直接重启用fstab来挂载也行
#df -h //现在来查看磁盘使用情况
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 17G 34G 33% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 84K 3.9G 1% /dev/shm
tmpfs 3.9G 9.0M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 494M 133M 362M 27% /boot
/dev/mapper/centos-home 50G 33M 50G 1% /home#mv /backup/* /home/ //再把之前拷出来的东西拷回新建的/home中，拷贝完成就可以直接用这个普通用户来桌面登录系统了，不用重启
最后再把释放出来多余的空间分配给root卷并xfs_growfs扩展文件系统
#lvextend -L +823G /dev/centos/root //把剩下的823G现在分配给root卷，剩下那点渣渣空间让它闲着；+号表示在原来的基础上额外增加，不要加好则设定为具体额度
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 873.00 GiB (223488 extents).
Logical volume root successfully resized#lvdisplay //查看逻辑卷和卷组情况，这下root的空间就多达到873G，之前的是50G
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID PgscNL-rvyY-21Z1-tVe3-80vC-ONCw-VlvmYs
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:04 +0800
LV Status available
# open 1
LV Size 873.00 GiB
Current LE 223488
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0[# vgchange -ay centos //可选步骤：再次激活下卷组centos]
#df -h //不使用xfs_growfs扩展文件系统，磁盘是不认得多的空间的
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 50G 4.8G 46G 10% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 140K 3.9G 1% /dev/shm
tmpfs 3.9G 9.0M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 494M 133M 362M 27% /boot
/dev/mapper/centos-home 50G 12G 39G 23% /home#xfs_growfs /dev/centos/root //扩展root卷
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=3276800 blks
= sectsz=4096 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=6400, version=2
= sectsz=4096 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 228851712#df -h //再看root大小已经生效，800多G了
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 873G 4.8G 869G 1% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 140K 3.9G 1% /dev/shm
tmpfs 3.9G 9.0M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 494M 133M 362M 27% /boot
/dev/mapper/centos-home 50G 12G 39G 23% /home
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