KVM

# Enabling mounting.

sudo modprobe nbd max_part=8

sudo qemu-nbd --connect=/dev/nbd0 /mnt/kvm/wordpress-sites.qcow2

sudo fdisk /dev/nbd0 -l

sudo mount /dev/nbd0p1 /mnt/somepoint/

sudo umount /mnt/somepoint/

sudo qemu-nbd --disconnect /dev/nbd0

# Enabling mounting.

sudo modprobe nbd max_part=8

sudo qemu-nbd --connect=/dev/nbd0 /mnt/kvm/wordpress-sites.qcow2

sudo fdisk /dev/nbd0 -l

sudo mount /dev/nbd0p1 /mnt/somepoint/

sudo umount /mnt/somepoint/

sudo qemu-nbd --disconnect /dev/nbd0

Example 2:

losetup /dev/loop0 raw-image-file.raw

##
# kpartx: 
#  Recognise and activate partitions in the image:
kpartx -a /dev/loop0

##
# Check partitions available to this image under /dev/mapper/loop0*
# ls /dev/mapper/loop0*
/dev/mapper/loop0p1 /dev/mapper/loop0p2 /dev/mapper/loop0p3 /dev/mapper/loop0p4 /dev/mapper/loop0p5 /dev/mapper/loop0p6

##
# mount each partition to a mount point: 

mount /dev/mapper/loop0p1 /mnt

##
# umount and delete created  objects. 

umount /mnt
kpartx -d /dev/loop0
losetup -d /dev/loop0

losetup /dev/loop0 raw-image-file.raw

# kpartx:

# Recognise and activate partitions in the image:

kpartx -a /dev/loop0

# Check partitions available to this image under /dev/mapper/loop0*

# ls /dev/mapper/loop0*

/dev/mapper/loop0p1 /dev/mapper/loop0p2 /dev/mapper/loop0p3 /dev/mapper/loop0p4 /dev/mapper/loop0p5 /dev/mapper/loop0p6

# mount each partition to a mount point:

mount /dev/mapper/loop0p1 /mnt

# umount and delete created objects.

umount /mnt

kpartx -d /dev/loop0

losetup -d /dev/loop0

KVM

root@server3.kutayzorlu.com:~#  qemu-img resize vmdisk.img +100G

# GPARTED and  extend  disk 

root@server3.kutayzorlu.com:~# lvdisplay
--- Logical volume ---
LV Path /dev/telekom_kutayzorlu_com-vg/root
LV Name root
VG Name telekom_kutayzorlu_com-vg
LV UUID s4szbj-zgxD-jniW-j904-wEhe-CQSf-3D2CXW
LV Write Access read/write
LV Creation host, time telekom_kutayzorlu_com, 2015-05-26 16:44:59 -0500
LV Status available
# open 1
LV Size 9.26 GiB
Current LE 2370
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0

--- Logical volume ---
LV Path /dev/telekom_kutayzorlu_com-vg/swap_1
LV Name swap_1
VG Name telekom_kutayzorlu_com-vg
LV UUID wcVWPh-kcec-0892-0hpj-wa34-l6eJ-VGnCp3
LV Write Access read/write
LV Creation host, time telekom_kutayzorlu_com, 2015-05-26 16:44:59 -0500
LV Status available
# open 2
LV Size 512.00 MiB
Current LE 128
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256

root@server3.kutayzorlu.com:~# qemu-img resize vmdisk.img +100G

# GPARTED and extend disk

root@server3.kutayzorlu.com:~# lvdisplay

--- Logical volume ---

LV Path /dev/telekom_kutayzorlu_com-vg/root

LV Name root

VG Name telekom_kutayzorlu_com-vg

LV UUID s4szbj-zgxD-jniW-j904-wEhe-CQSf-3D2CXW

LV Write Access read/write

LV Creation host, time telekom_kutayzorlu_com, 2015-05-26 16:44:59 -0500

LV Status available

# open 1

LV Size 9.26 GiB

Current LE 2370

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 252:0

--- Logical volume ---

LV Path /dev/telekom_kutayzorlu_com-vg/swap_1

LV Name swap_1

VG Name telekom_kutayzorlu_com-vg

LV UUID wcVWPh-kcec-0892-0hpj-wa34-l6eJ-VGnCp3

LV Write Access read/write

LV Creation host, time telekom_kutayzorlu_com, 2015-05-26 16:44:59 -0500

LV Status available

# open 2

LV Size 512.00 MiB

Current LE 128

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Important for us

LV Path /dev/telekom_kutayzorlu_com-vg/root
LV Name root

1 2	LV Path /dev/telekom_kutayzorlu_com-vg/root LV Name root

root@server3.kutayzorlu.com:~#
root@server3.kutayzorlu.com:~# vgdisplay
  --- Volume group ---
  VG Name               telekom_kutayzorlu_com-vg
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               29.76 GiB
  PE Size               4.00 MiB
  Total PE              7618
  Alloc PE / Size       2498 / 9.76 GiB
  Free  PE / Size       5120 / 20.00 GiB
  VG UUID               6OvM2c-4jFf-5Mqt-IbrF-8f5O-2hsh-EjVIGd

root@server3.kutayzorlu.com:~#

root@server3.kutayzorlu.com:~# vgdisplay

--- Volume group ---

VG Name telekom_kutayzorlu_com-vg

System ID

Format lvm2

Metadata Areas 1

Metadata Sequence No 4

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 2

Open LV 2

Max PV 0

Cur PV 1

Act PV 1

VG Size 29.76 GiB

PE Size 4.00 MiB

Total PE 7618

Alloc PE / Size 2498 / 9.76 GiB

Free PE / Size 5120 / 20.00 GiB

VG UUID 6OvM2c-4jFf-5Mqt-IbrF-8f5O-2hsh-EjVIGd

**>> Free PE / Size 5120 / 20.00 GiB

So Firstly we are extending volume group
# lvextend -l +5120 /dev/telekom_kutayzorlu_com-vg/root

After Resize to see Action in Disk Size Now
# resize2fs /dev/telekom_kutayzorlu_com-vg/root

If you are using XFS file format it will give error so use that
# xfs_growfs /dev/telekom_kutayzorlu_com-vg/root

root@server3.kutayzorlu.com:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 990M 0 990M 0% /dev
tmpfs 201M 4.7M 196M 3% /run
/dev/mapper/telekom_kutayzorlu_com--vg-root 29G 2.8G 25G 10% /
tmpfs 1001M 0 1001M 0% /dev/shm
tmpfs 5.0M 4.0K 5.0M 1% /run/lock
tmpfs 1001M 0 1001M 0% /sys/fs/cgroup
/dev/sda1 236M 42M 182M 19% /boot
tmpfs 201M 0 201M 0% /run/user/1000

root@server3.kutayzorlu.com:~# df -h

Filesystem Size Used Avail Use% Mounted on

udev 990M 0 990M 0% /dev

tmpfs 201M 4.7M 196M 3% /run

/dev/mapper/telekom_kutayzorlu_com--vg-root 29G 2.8G 25G 10% /

tmpfs 1001M 0 1001M 0% /dev/shm

tmpfs 5.0M 4.0K 5.0M 1% /run/lock

tmpfs 1001M 0 1001M 0% /sys/fs/cgroup

/dev/sda1 236M 42M 182M 19% /boot

tmpfs 201M 0 201M 0% /run/user/1000

mount kvm disk qcow on linux

Virtual machine resize Disk Volume Group