CentOS7 by default partitions your storage by putting a large amount of space in the /home directory partition. For most use-cases, this is perfectly fine. However, if you’re working with limited space, and have already installed a default install of CentOS, you may find you need to reclaim some of the space in your /home parition for use with other partitions.
Before continuing, you will want to MAKE A BACKUP OF YOUR /HOME DIRECTORY if there’s anything in it you want to keep. Once you’ve got your files backed up, you can merge your /home partition with your /root partition using the following commands. I’ll show you the output as well so you can know what to expect.
[root@localhost ~]# umount /home [root@localhost ~]# lvremove /dev/centos/home Do you really want to remove active logical volume centos/home? [y/n]: y Logical volume "home" successfully removed [root@localhost ~]# lvextend -l +100%FREE /dev/centos/root Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to <444.81 GiB (113871 extents). Logical volume centos/root successfully resized. [root@localhost ~]# xfs_growfs /dev/centos/root meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=3276800 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 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=0 log =internal bsize=4096 blocks=6400, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 13107200 to 116603904 [root@localhost ~]#
Next you’ll need to edit your /etc/fstab file so that CentOS doesn’t try to mount a /home partition that no longer exists. Just edit /etc/fstab in your preferred editor and remove or comment out the following line:
/dev/mapper/centos-home /home xfs defaults 1 2
That’s it! Your root directory should now have all the space that used to be allocated to your /home directory and you should be good on your next reboot as well.
Hope this helps.