By default in a CentOS7 install we get a couple of partitions created for the root user and one for home usually something like this:
# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT fd0 2:0 1 4K 0 disk sda 8:0 0 70G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 69.5G 0 part ├─centos-swap 253:0 0 2G 0 lvm [SWAP] ├─centos-root 253:1 0 45.3G 0 lvm / └─centos-home 253:2 0 22.1G 0 lvm /home sr0 11:0 1 1024M 0 rom
Note that the root partition is 45.3Gb and the home partition is 22.1Gb
Often I find myself wanting or needing to remove the centos-home partition and expand the centos-root partition.
It is a pretty straight forward exercise, but one that I often forget the steps involved.
So here they are:
• First backup any data that might exist in /home so you can restore it later.
There are many ways to do this and depending upon how much data you have and where you need to store your backup. So I will leave this up to you to decide how to go about this
• Unmount the centos-home partition.
# umount /home/
• Next show the logical volumes.
# lvdisplay --- Logical volume --- LV Path /dev/centos/root LV Name root VG Name centos LV UUID H8tAWA-f5nF-iBXR-Ew3L-djcI-4Vpg-zcjsPK LV Write Access read/write LV Creation host, time localhost, 2015-07-20 05:28:54 -0400 LV Status available # open 1 LV Size 45.34 GiB Current LE 11607 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 VvIe9h-ZdOF-KvhU-PDLZ-zpXD-rrMV-MTAwSA LV Write Access read/write LV Creation host, time localhost, 2015-07-20 05:28:54 -0400 LV Status available # open 0 LV Size 22.14 GiB Current LE 5667 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 --- Logical volume --- LV Path /dev/centos/swap LV Name swap VG Name centos LV UUID 1C22cf-Mq0r-5cDY-YX5T-d7sh-tMLu-zbAxAh LV Write Access read/write LV Creation host, time localhost, 2015-07-20 05:28:55 -0400 LV Status available # open 2 LV Size 2.03 GiB Current LE 520 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0
•Now remove the logical volume for centos-home.
# lvremove /dev/centos/home Do you really want to remove active logical volume home? [y/n]: y Logical volume "home" successfully removed
•You should now have the free space available in VFree when you have a look using vgs.
# vgs VG #PV #LV #SN Attr VSize VFree centos 1 2 0 wz--n- 69.51g 22.14g
• Now resize the centos-root partition.
# lvextend --size +22.13GB -r /dev/mapper/centos-root Rounding size to boundary between physical extents: 22.13 GiB Extending logical volume root to 67.47 GiB Logical volume root successfully resized meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=2971392 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 data = bsize=4096 blocks=11885568, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=5803, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 11885568 to 17687552
Note that I expanded the partition by slightly less than the available space, 22.13Gb instead of 22.14Gb, this is just to make sure you avoid hitting an insufficient free space error.
• Confirm your new partition size.
# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT fd0 2:0 1 4K 0 disk sda 8:0 0 70G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 69.5G 0 part ├─centos-swap 253:0 0 2G 0 lvm [SWAP] └─centos-root 253:1 0 67.5G 0 lvm / sr0 11:0 1 1024M 0 rom
• Remove the centos-home mount from fstab so that the system does not try to mount it at startup
# sed -i '/centos-home/d' /etc/fstab