How to merge home and root partitions on Centos 7


Sometimes while provisioning server from an image causes home partition gets assigned with  some partition which you don't want & yoiu want to merge root & home altogether.


Here is how you can do it:

[root@navicosoft-854 ~]# lsblk
NAME                                             MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                                                8:0    0 465.8G  0 disk
├─sda1                                             8:1    0     1G  0 part /boot
└─sda2                                             8:2    0 464.8G  0 part
  ├─centos_navicosoft--user-root                        253:0    0    50G  0 lvm  /
  ├─centos_navicosoft--user-swap                        253:1    0  31.4G  0 lvm  [SWAP]
  └─centos_navicosoft--user-home                        253:2    0 383.3G  0 lvm  /home
sdb                                                8:16   0 931.5G  0 disk
sdc                                                8:32   0 465.8G  0 disk
├─vg2-vsv1003--d7ukx3rejw5mmq8i--q6ltarafzvxfk8nh
                                                 253:3    0    12G  0 lvm
└─vg2-vsv1004--dgxoydbojwnmbwro--wimqwmuu3ne3t9qw
                                                 253:4    0   100G  0 lvm
sdd                                                8:48   0 931.5G  0 disk

Firstly umount your home partition.

# umount /dev/mapper/centos_navicosoft--user-home

Then you need to remove this volume using lvremove

# lvremove /dev/mapper/centos_navicosoft--user-home
Do you really want to remove active logical volume centos_navicosoft-user/home? [y/n]: y
  Logical volume "home" successfully removed

Now you should extend volume using lvextend

# lvextend -l +100%FREE -r /dev/mapper/centos_navicosoft--user-root
  Size of logical volume centos_navicosoft-user/root changed from 50.00 GiB (12800 extents) to 433.32 GiB (110930 extents).
  Logical volume centos_navicosoft-user/root successfully resized.
meta-data=/dev/mapper/centos_navicosoft--user-root isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   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=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 113592320
[root@navicosoft-user ~]# df -h
Filesystem                         Size  Used Avail Use% Mounted on
/dev/mapper/centos_navicosoft--user-root  434G   16G  419G   4% /
devtmpfs                            32G     0   32G   0% /dev
tmpfs                               32G     0   32G   0% /dev/shm
tmpfs                               32G   50M   32G   1% /run
tmpfs                               32G     0   32G   0% /sys/fs/cgroup
/dev/sda1                         1014M  173M  842M  18% /boot
tmpfs                              6.3G     0  6.3G   0% /run/user/0


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