l vm管理CentOS 7调整 home分区扩大root分区

[root@test1 ~]# df -h

文件系统 容量 已用 可用 已用% 挂载点

/dev/mapper/centos-root   20G  1.5G   19G    8% /

devtmpfs                 983M     0  983M    0% /dev

tmpfs                    993M     0  993M    0% /dev/shm

tmpfs                    993M  8.6M  985M    1% /run

tmpfs                    993M     0  993M    0% /sys/fs/cgroup

/dev/sda1                497M  108M  390M   22% /boot

/dev/mapper/centos-home   28G   33M   28G    1% /home

tmpfs                    199M     0  199M    0% /run/user/0

[root@test1 ~]# tar cvf /tmp/home.tar /home/

[root@test1 ~]# fuser -km /home/

[root@test1 ~]# umount /home/

[root@test1 ~]# df -h

文件系统 容量 已用 可用 已用% 挂载点

/dev/mapper/centos-root   20G  1.6G   19G    8% /

devtmpfs                 983M     0  983M    0% /dev

tmpfs                    993M     0  993M    0% /dev/shm

tmpfs                    993M   17M  977M    2% /run

tmpfs                    993M     0  993M    0% /sys/fs/cgroup

/dev/sda1                497M  108M  390M   22% /boot

tmpfs                    199M     0  199M    0% /run/user/0

[root@test1 ~]# lvremove /dev/mapper/centos-home

Do you really want to remove active logical volume home? [y/n]: y

Logical volume "home" successfully removed

[root@test1 ~]# lvextend -L +10G /dev/mapper/centos-root

Size of logical volume centos/root changed from 20.00 GiB (5120 extents) to 30.00 GiB (7680 extents).

Logical volume root successfully resized.

[root@test1 ~]# xfs_growfs /dev/mapper/centos-root

meta-data=/dev/mapper/centos-root isize=256    agcount=4, agsize=1310720 blks

=                       sectsz=512   attr=2, projid32bit=1

=                       crc=0        finobt=0

data     =                       bsize=4096   blocks=5242880, imaxpct=25

=                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=0

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 5242880 to 7864320

[root@test1 ~]# df -h

文件系统 容量 已用 可用 已用% 挂载点

/dev/mapper/centos-root   30G  1.6G   29G    6% /

devtmpfs                 983M     0  983M    0% /dev

tmpfs                    993M     0  993M    0% /dev/shm

tmpfs                    993M   17M  977M    2% /run

tmpfs                    993M     0  993M    0% /sys/fs/cgroup

/dev/sda1                497M  108M  390M   22% /boot

tmpfs                    199M     0  199M    0% /run/user/0

[root@test1 ~]# lvcreate -L 18G -n /dev/mapper/centos-home

Volume group "centos" has insufficient free space (4482 extents): 4608 required.

##若与到以上问题，磁盘空间不足导致，减小创建的lv即可

[root@test1 ~]# lvcreate -L 17G -n /dev/mapper/centos-home

Logical volume "home" created.

[root@test1 ~]# mkfs.xfs  /dev/mapper/centos-home

meta-data=/dev/mapper/centos-home isize=256    agcount=4, agsize=1114112 blks

=                       sectsz=512   attr=2, projid32bit=1

=                       crc=0        finobt=0

data     =                       bsize=4096   blocks=4456448, imaxpct=25

=                       sunit=0      swidth=0 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=0

log      =internal log           bsize=4096   blocks=2560, version=2

=                       sectsz=512   sunit=0 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

[root@test1 ~]# mount /dev/mapper/centos-home

##查看home

[root@test1 ~]# df -h

文件系统 容量 已用 可用 已用% 挂载点

/dev/mapper/centos-root   30G  1.6G   29G    6% /

devtmpfs                 983M     0  983M    0% /dev

tmpfs                    993M     0  993M    0% /dev/shm

tmpfs                    993M   17M  977M    2% /run

tmpfs                    993M     0  993M    0% /sys/fs/cgroup

/dev/sda1                497M  108M  390M   22% /boot

tmpfs                    199M     0  199M    0% /run/user/0

/dev/mapper/centos-home   17G   33M   17G    1% /home

tar xvf /tmp/home.tar -C /home/

cd /home/home/

mv * ../