linux下分区调整过程以及遇到的问题

今天本地的一台服务器根目录占用显示为100%，查了一下，还是暂时先把home目录下的一部分划给/目录

一、目录占用查看

可以看到红色部分的/目录占用为100%，而绿色部分的/home下还有865G，虽然不建议划给/目录，但还是想快速处理一下

二、备份

# mkdir /tmp/home
# cp -r /home/* /tmp/home

三、卸载

[root@aaa ]# umount /home
umount: /home: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

卸载过程中出现了target is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
那我们先解除占用

[root@aaa ]# fuser  -mv -k  /home
                     USER        PID ACCESS COMMAND
/home:               root     kernel mount /home
                     git        1447 F.ce. gogs

再次卸载，查询,就会发现已经卸载

[root@aaa ]# umount /home
[root@aaa ]# df -h

三、调整分区

按照以前的resize2fs方式来卸载分区,报了个错

[root@aaa ]# resize2fs -p /dev/mapper/centos-home
e2fsck 1.42.9 (28-Dec-2013)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/mapper/centos-home

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
    e2fsck -b 8193 <device>

查了一下，文件系统是xfs，不支持resize2fs，所以换一种方式

[root@aaa ]# cat /etc/fstab | grep centos-home
/dev/mapper/centos-home /home                   xfs     defaults        0 0

删除home的逻辑卷

[root@aaa ]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
  Couldn't create temporary archive name.

还是有一些问题，是因为/为100%，满了，所以需要删一些东西才能释放

删除逻辑卷，重新调整/的大小,刷新xfs，把剩下的划分到/home中

[root@aaa ]# lvremove /dev/mapper/centos-home
  Logical volume "home" successfully removed
[root@aaa ]# lvextend -L 365G /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 365.00 GiB (93440 extents).
  Logical volume centos/root successfully resized.
[root@aaa ]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
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 95682560

格式化分区，mount装载,查看

[root@aaa ]# lvcreate -l +100%free -n home centos
  Logical volume "home" created.
[root@ayc local]# mkfs.xfs /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=512    agcount=4, agsize=36033024 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=144132096, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=70377, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
mount /dev/mapper/centos-home /home
[root@aaa ]# mount /dev/mapper/centos-home /home
[root@aaa ]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                  16G     0   16G   0% /dev
tmpfs                     16G   20K   16G   1% /dev/shm
tmpfs                     16G  795M   15G   5% /run
tmpfs                     16G     0   16G   0% /sys/fs/cgroup
/dev/mapper/centos-root  365G   50G  316G  14% /
/dev/sda1               1014M  205M  810M  21% /boot
tmpfs                    3.2G   12K  3.2G   1% /run/user/42
tmpfs                    3.2G     0  3.2G   0% /run/user/0
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/81f0e164187b58b5a6f86e14f573fd1b8971a7b013cd9a9b2f00b34ca4427c62/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/199e2290380e1820ff43ec0603010930cb45998392719fdc10ff4bfb7d2205a6/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/ca1b3a953378767f0fe4510617b3162abe2165f72aa3de20595ae860ea0d9466/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/3408eb97e4b4aac2956f6e67cec14334e11dfc5d677025a20d607a1f4ea883a3/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/4740e11acbe59cae037c4da113e0382e95b465b02cda081b0086102c9a28911a/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/7b331ea8c4ea05f2d7a55c59e8da35c23b3d8ed6adff3ec742a93f5cff388d33/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/cb138904b6c6b96a8112a0b41278dea5cae4b8e4e736052a961362248297f0d8/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/ba061d20b9d880a341fd2bfff961979ffbdec01ef0f081a13c15273c7f80efd4/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/25c4efcfe602b6e3e6c161cefec067bd5fbf456258fa5379eece87de21db606e/merged
overlay                  365G   50G  316G  14% /var/lib/docker/overlay2/f01ef666ef64b484e40b518a663a3e5ad9c51b6a175680135ba6e0e27d2e599e/merged
/dev/mapper/centos-home  550G   33M  550G   1% /home

恢复备份就ok啦

# cp -r /tmp/home* /home/