需求前提:
现有Linux机器,/ 分区大小不到50G或者刚好50G
现想减小其他分区的大小,然后对 / 分区进行扩容
命令执行:
首先查看机器分区情况
[root@localhost ~] # df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 50G 1.1G 49G 3% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 17M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 494M 126M 369M 26% /boot
/dev/mapper/centos-home 69G 33M 69G 1% /home
tmpfs 782M 0 782M 0% /run/user/0
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举例机器为centos系统,如果是RHEL, Filesystem对用的mapper大概为 rhel-home 样式
由分区情况可以看到/home的大小为69G,那就确定减小/home的大小,然后添加到 / 分区
有关备份的内容这里不再叙述,大家自己处理
取消挂载/home
[root@localhost ~] # umount /home
[root@localhost ~] # df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 50G 1.1G 49G 3% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 17M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 494M 126M 369M 26% /boot
tmpfs 782M 0 782M 0% /run/user/0
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删除/home所在的lv
[root@localhost ~] # lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume home? [y /n ]: y
Logical volume "home" successfully removed
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扩展 / 分区lv,增加30G
[root@localhost ~] # lvextend -L +30G /dev/mapper/centos-root
Size of logical volume centos /root changed from 50.00 GiB (12800 extents) to 80.00 GiB (20480 extents).
Logical volume root successfully resized.
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扩展 / 分区文件系统
[root@localhost ~] # xfs_growfs /dev/mapper/centos-root
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 20971520 |
重新创建 /home lv
[root@localhost ~] # lvcreate -L 39G -n /dev/mapper/centos-home
Volume group "centos" has insufficient free space (9890 extents): 9984 required.
[root@localhost ~] # lvcreate -L 38G -n /dev/mapper/centos-home
Logical volume "home" created.
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注意这里,我第一次创建39G时,提示空间不足,所以创建了38G,这里根据实际容量动态调整即可
创建/home文件系统
[root@localhost ~] # mkfs.xfs /dev/mapper/centos-home
meta-data= /dev/mapper/centos-home isize=256 agcount=4, agsize=2490368 blks
= sectsz=4096 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=9961472, imaxpct=25 = sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal log bsize=4096 blocks=4864, version=2 = sectsz=4096 sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0 |
挂载 /home
[root@localhost ~] # mount /dev/mapper/centos-home
[root@localhost ~] # df -h
Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 80G 1.1G 79G 2% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 17M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda1 494M 126M 369M 26% /boot
tmpfs 782M 0 782M 0% /run/user/0
/dev/mapper/centos-home 38G 33M 38G 1% /home
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到这里,大功告成
Hope helpful