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edited Jun 17, 2018 at 5:14

101
1

fdisk /dev/xvda ...(n > p = 2 > t = 8e)

reboot

pvcreate /dev/xvda2

vgcreate centos /dev/xvda2

lvcreate -n home -L 200G centos

lvcreate -n root -L 100G centos

lvcreate -n swap -L 4G cent

mkfs.ext4 /dev/centos/root

mkfs.ext4 /dev/centos/home

mkswap /dev/centos/swap

mount /dev/xvda1 /boot

...This is what i want to do but was not permitted.

So instead, i updated /etc/fstab and changed mount point for /dev/xvda1 from / to /boot. But this also does not work.

In the results provided below, df -h shows the correct mount points for both /dev/xvda1 i.e. /boot and /dev/mapper/centos-root i.e. / but the disk space shown for /dev/mapper/centos-root = 7.8G is incorrect. I was expecting ~100G.

Also, the results for lsblk shows empty mount point for centos-root (dm-1). For centos-root, i expected mount point / and for /dev/xvda1 expected mount point /boot.

mount /dev/centos/root /

mount /dev/centos/home /home

make corresponding entries into /etc/fstab (refer cat /etc/fstab below)

shutdown -r now

mkhomedir_helper centos

On reboot, home dir for centos became inaccessible and so i got error "Could not chdir to home directory /home/centos: No such file or directory". To resolve, I had to run the above command to recreate home directory for user centos

fdisk /dev/xvda ...(n > p = 2 > t = 8e)

reboot

pvcreate /dev/xvda2

vgcreate centos /dev/xvda2

lvcreate -n home -L 200G centos

lvcreate -n root -L 100G centos

lvcreate -n swap -L 4G cent

mkfs.ext4 /dev/centos/root

mkfs.ext4 /dev/centos/home

mkswap /dev/centos/swap

mount /dev/xvda1 /boot

...This is what i want to do but was not permitted.

So instead, i updated /etc/fstab and changed mount point for /dev/xvda1 from / to /boot. But this also does not work.

In the results provided below, df -h shows the correct mount points for both /dev/xvda1 i.e. /boot and /dev/mapper/centos-root i.e. / but the disk space shown for /dev/mapper/centos-root = 7.8G is incorrect. I was expecting ~100G.

Also, the results for lsblk shows empty mount point for centos-root (dm-1). For centos-root, i expected mount point / and for /dev/xvda1 expected mount point /boot.

mount /dev/centos/root /

mount /dev/centos/home /home

make corresponding entries into /etc/fstab (refer cat /etc/fstab below)

shutdown -r now

fdisk /dev/xvda ...(n > p = 2 > t = 8e)

reboot

pvcreate /dev/xvda2

vgcreate centos /dev/xvda2

lvcreate -n home -L 200G centos

lvcreate -n root -L 100G centos

lvcreate -n swap -L 4G cent

mkfs.ext4 /dev/centos/root

mkfs.ext4 /dev/centos/home

mkswap /dev/centos/swap

mount /dev/xvda1 /boot

...This is what i want to do but was not permitted.

So instead, i updated /etc/fstab and changed mount point for /dev/xvda1 from / to /boot. But this also does not work.

In the results provided below, df -h shows the correct mount points for both /dev/xvda1 i.e. /boot and /dev/mapper/centos-root i.e. / but the disk space shown for /dev/mapper/centos-root = 7.8G is incorrect. I was expecting ~100G.

Also, the results for lsblk shows empty mount point for centos-root (dm-1). For centos-root, i expected mount point / and for /dev/xvda1 expected mount point /boot.

mount /dev/centos/root /

mount /dev/centos/home /home

make corresponding entries into /etc/fstab (refer cat /etc/fstab below)

shutdown -r now

mkhomedir_helper centos

On reboot, home dir for centos became inaccessible and so i got error "Could not chdir to home directory /home/centos: No such file or directory". To resolve, I had to run the above command to recreate home directory for user centos

for better clarity, included sections `initial state` and `steps i performed`

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edited Jun 17, 2018 at 5:03

Bipo K

101
1

Initial State of System:

# fdisk -l
Disk /dev/xvda: 536.9 GB, 536870912000 bytes 255 heads, 63 sectors/track, 65270 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000611ee
    Device      Boot    Start   End      Blocks   Id  System
    /dev/xvda1   *      1       1045     8387584   83  Linux
Disk /dev/xvdb: 32.2 GB, 32204390400 bytes 255 heads, 63 sectors/track, 3915 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000

# lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
xvda    202:0    0  500G  0 disk
└─xvda1 202:1    0    8G  0 part /
xvdb    202:16   0   30G  0 disk /mnt

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      7.8G  897M  6.5G  12% /
tmpfs           3.6G     0  3.6G   0% /dev/shm
/dev/xvdb        30G  173M   28G   1% /mnt

# cat /etc/fstab
UUID=2d0f2d55-672b-4c05-8eba-9421dd808ad7 / ext4    defaults 1 1
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/xvdb       /mnt    auto    defaults,nofail,comment=cloudconfig     0 2

Steps i performed:

fdisk /dev/xvda ...(n > p = 2 > t = 8e)

reboot

pvcreate /dev/xvda2

vgcreate centos /dev/xvda2

lvcreate -n home -L 200G centos

lvcreate -n root -L 100G centos

lvcreate -n swap -L 4G cent

mkfs.ext4 /dev/centos/root

mkfs.ext4 /dev/centos/home

mkswap /dev/centos/swap

mount /dev/xvda1 /boot

...This is what i want to do but was not permitted.

So instead, i updated /etc/fstab and changed mount point for /dev/xvda1 from / to /boot. But this also does not work.

In the results provided below, df -h shows the correct mount points for both /dev/xvda1 i.e. /boot and /dev/mapper/centos-root i.e. / but the disk space shown for /dev/mapper/centos-root = 7.8G is incorrect. I was expecting ~100G.

Also, the results for lsblk shows empty mount point for centos-root (dm-1). For centos-root, i expected mount point / and for /dev/xvda1 expected mount point /boot.

mount /dev/centos/root /

mount /dev/centos/home /home

make corresponding entries into /etc/fstab (refer cat /etc/fstab below)

shutdown -r now

Initial State of System:

# fdisk -l
Disk /dev/xvda: 536.9 GB, 536870912000 bytes 255 heads, 63 sectors/track, 65270 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000611ee
    Device      Boot    Start   End      Blocks   Id  System
    /dev/xvda1   *      1       1045     8387584   83  Linux
Disk /dev/xvdb: 32.2 GB, 32204390400 bytes 255 heads, 63 sectors/track, 3915 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000

# lsblk
NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
xvda    202:0    0  500G  0 disk
└─xvda1 202:1    0    8G  0 part /
xvdb    202:16   0   30G  0 disk /mnt

# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      7.8G  897M  6.5G  12% /
tmpfs           3.6G     0  3.6G   0% /dev/shm
/dev/xvdb        30G  173M   28G   1% /mnt

# cat /etc/fstab
UUID=2d0f2d55-672b-4c05-8eba-9421dd808ad7 / ext4    defaults 1 1
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/xvdb       /mnt    auto    defaults,nofail,comment=cloudconfig     0 2

Steps i performed:

fdisk /dev/xvda ...(n > p = 2 > t = 8e)

reboot

pvcreate /dev/xvda2

vgcreate centos /dev/xvda2

lvcreate -n home -L 200G centos

lvcreate -n root -L 100G centos

lvcreate -n swap -L 4G cent

mkfs.ext4 /dev/centos/root

mkfs.ext4 /dev/centos/home

mkswap /dev/centos/swap

mount /dev/xvda1 /boot

...This is what i want to do but was not permitted.

So instead, i updated /etc/fstab and changed mount point for /dev/xvda1 from / to /boot. But this also does not work.

In the results provided below, df -h shows the correct mount points for both /dev/xvda1 i.e. /boot and /dev/mapper/centos-root i.e. / but the disk space shown for /dev/mapper/centos-root = 7.8G is incorrect. I was expecting ~100G.

Also, the results for lsblk shows empty mount point for centos-root (dm-1). For centos-root, i expected mount point / and for /dev/xvda1 expected mount point /boot.

mount /dev/centos/root /

mount /dev/centos/home /home

make corresponding entries into /etc/fstab (refer cat /etc/fstab below)

shutdown -r now

Source Link

asked Jun 16, 2018 at 14:46

Bipo K

101
1

Problem resizing ext4 root partition on Centos6x64

My Centos6x64 VM came has a ~500G disk xvda. Initially, 8G was allocated to xvda1 and mounted on /. The remainder of the 500G disk space in xvda was not yet allocated. So i decided to make this remainder disk space usable and created a partition xvda2 with logical volumes using fdisk, pvcreate, vgcreate, lvcreate, formatting and finally updating fstab to mounted them automatically.

The relationships to the corresponding folders (mount point) is:

/dev/centos/home ..../home [200G]
/dev/centos/root ..../ [100G]

Problem is:

The /home seem to have mounted correctly as size shown upon df -h is 197G.
But the mounting on root is not correct. In the results for df -h below, the size of /dev/xvda1 mounted on /boot is 7.8G which is correct. But, the size of /dev/mapper/centos-root mounted on / incorrectly shows 7.8G. It should show approximately 100G. It is incorrectly showing the same disk space as that of /dev/xvda1.

Questions:

I have tried to collate some results below for your reference. Kindly help resolve this problem. What can i do to correct the problem?
Also, if i just wanted to increase the disk space allocated to xvda1 from 8G to say 200G, is there a simpler more direct way? on googling, i found this post that very much matched the objective. But i could not get it to reboot successfully as it lay stuck on the grub screen. I don't have much info on this failure details. Could i have missed out some setup pre-requisites when using fdisk to allocate additional disk space eg: formatting?

I pretty much new on this and stuck. Please Kindly help.

cat /etc/fstab

UUID=3a75c67b-5053-4863-963e-c6a572f13972       /       ext4    defaults        1 1
UUID=2d0f2d55-672b-4c05-8eba-9421dd808ad7       /boot   ext4    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/xvdb       /mnt    auto    defaults,nofail,comment=cloudconfig     0 2
/dev/mapper/centos-home         /home              ext4    defaults     0 0

fdisk -l

    Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1        1045     8387584   83  Linux
/dev/xvda2            1045       65270   515892667   8e  Linux LVM

df -h

Filesystem              Size  Used Avail Use%  Mounted on
/dev/mapper/centos-root 7.8G  898M  6.5G  12%  /
tmpfs                   3.6G     0  3.6G   0%  /dev/shm
/dev/xvda1              7.8G  898M  6.5G  12%  /boot
/dev/xvdb               30G   173M   28G   1%  /mnt
/dev/mapper/centos-home 197G   60M  187G   1%  /home

lsblk

NAME                   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
xvda                   202:0    0  500G  0 disk
├─xvda1                202:1    0    8G  0 part /
└─xvda2                202:2    0  492G  0 part
  ├─centos-home (dm-0) 253:0    0  200G  0 lvm  /home
  ├─centos-root (dm-1) 253:1    0  100G  0 lvm
  └─centos-swap (dm-2) 253:2    0    4G  0 lvm
xvdb                   202:16   0   30G  0 disk /mnt

blkid

/dev/xvda1: UUID="2d0f2d55-672b-4c05-8eba-9421dd808ad7" TYPE="ext4"
/dev/xvdb: UUID="3656cb72-7e94-4e63-81ea-66397ad45d13" SEC_TYPE="ext2" TYPE="ext3"
/dev/xvda2: UUID="ASXeKh-x8xL-nDVF-afzq-zU8a-sCbd-qGM6pS" TYPE="LVM2_member"
/dev/mapper/centos-home: UUID="4510891a-354d-4486-bd47-95d474f197bb" TYPE="ext4"
/dev/mapper/centos-root: UUID="3a75c67b-5053-4863-963e-c6a572f13972" TYPE="ext4"
/dev/mapper/centos-swap: UUID="5dff9552-3d36-4cfa-936c-28e02c1ae108" TYPE="swap"

lvdisplay

  --- Logical volume ---
  LV Path                /dev/centos/home
  LV Name                home
  VG Name                centos
  LV UUID                lFWQxa-mqgc-Ur8t-npDc-O2NU-r6J4-UhC2j2
  LV Write Access        read/write
  LV Creation host, time ip-xx-xx-xx-xx.ec2.internal, 2018-06-16 07:18:22 +0000
  LV Status              available
  # open                 1
  LV Size                200.00 GiB
  Current LE             51200
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                UQ6oAD-JyRa-cb8l-VmgW-aZh9-qbof-Z1Z9af
  LV Write Access        read/write
  LV Creation host, time ip-xx-xx-xx-xx.ec2.internal, 2018-06-16 07:18:22 +0000
  LV Status              available
  # open                 0
  LV Size                100.00 GiB
  Current LE             25600
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                QyY2z9-5EpX-D8dY-DORZ-9BbY-TqgA-07fc3X
  LV Write Access        read/write
  LV Creation host, time ip-xx-xx-xx-xx.ec2.internal, 2018-06-16 07:18:24 +0000
  LV Status              available
  # open                 0
  LV Size                4.00 GiB
  Current LE             1024
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

linux centos ext4

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Initial State of System:

Steps i performed:

Initial State of System:

Steps i performed:

Problem resizing ext4 root partition on Centos6x64

cat /etc/fstab

fdisk -l

df -h

lsblk

blkid

lvdisplay