First time capturing CentOS Linux image - Drive won't shrink

kafluke

I have my image container set to “Single Disk - Resizable” but when I go to capture the image it is capturing the entire 500gb drive. Empty space and all. Is there some command that I need to run on the Linux box before shutting it down?

Tom Elliott

Going to guess CentOS is built on LVM?

kafluke

@tom-elliott I think so yes. How do I tell?

Wayne Workman

@kafluke These commands:

lvdisplay
vgdisplay
pvdisplay
lsblk
df -h

kafluke

@wayne-workman

oot@localhost ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/VolGroup/lv_root
  LV Name                lv_root
  VG Name                VolGroup
  LV UUID                8eSY96-2DZs-XcRb-P5Yk-6cLC-NgKo-khI0x7
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2018-01-31 13:10:22 -0500
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Path                /dev/VolGroup/lv_home
  LV Name                lv_home
  VG Name                VolGroup
  LV UUID                wCyqEP-KrM4-Qcfr-5JwM-2i6H-Z3Id-DFuQ9X
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2018-01-31 13:10:36 -0500
  LV Status              available
  # open                 1
  LV Size                411.41 GiB
  Current LE             105321
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Path                /dev/VolGroup/lv_swap
  LV Name                lv_swap
  VG Name                VolGroup
  LV UUID                rJ669N-nuiy-VzhY-qjpm-QzXc-ljpm-piiPrV
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2018-01-31 13:11:33 -0500
  LV Status              available
  # open                 1
  LV Size                3.86 GiB
  Current LE             988
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

[root@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               465.27 GiB
  PE Size               4.00 MiB
  Total PE              119109
  Alloc PE / Size       119109 / 465.27 GiB
  Free  PE / Size       0 / 0
  VG UUID               idHhLk-uM2L-x78s-UkET-3NnG-IaOs-ig2qae

[root@localhost ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               VolGroup
  PV Size               465.27 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              119109
  Free PE               0
  Allocated PE          119109
  PV UUID               N3L3CC-tvY8-ueht-ydt2-Kj8o-O6pD-zdmxTd

[root@localhost ~]# lsblk
NAME                        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                           8:0    0 465.8G  0 disk
├─sda1                        8:1    0  77.7M  0 part /boot
└─sda2                        8:2    0 465.3G  0 part
  ├─VolGroup-lv_root (dm-0) 253:0    0    50G  0 lvm  /
  ├─VolGroup-lv_swap (dm-1) 253:1    0   3.9G  0 lvm  [SWAP]
  └─VolGroup-lv_home (dm-2) 253:2    0 411.4G  0 lvm  /home
[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
                       50G  6.7G   40G  15% /
tmpfs                 1.9G     0  1.9G   0% /dev/shm
/dev/sda1              64M   31M   29M  52% /boot
/dev/mapper/VolGroup-lv_home
                      405G  144M  385G   1% /home

kafluke

What now? How do I get FOG to shrink when capturing?

Wayne Workman

@kafluke said in First time capturing CentOS Linux image - Drive won’t shrink:

How do I get FOG to shrink when capturing?

Looking at the output below, your image is using LVM. Normally this is a good thing and preferred in the Linux world. Unfortunately, fog currently cannot resize an image that uses LVM.

The way to go about making this work for you is to recreate the image but do not use LVM, and ensure all the partitions you create are of the type: Ext4 or swap.

Everyone who hangs around on these forums is generally really good at Linux partitioning - so if you need some guidance on how to lay it out, we can help you with that, just ask.

kafluke

Okay that was it. Thanks. I reset my image using ext4

First time capturing CentOS Linux image - Drive won't shrink

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