Resizing LVMs

I was deploying a VM and I needed more space for /.
So first I turned off the machine and modified the machine.ovf file to increase de size of the hard disk:
From

<Disk ovf:capacity="8589934592" ovf:diskId="vmdisk2" ovf:fileRef="file1"…

<Disk ovf:capacity="28589934592" ovf:diskId="vmdisk2" ovf:fileRef="file1"…

Then I started the VM to expand the fs
Initial situation (take a look at /)

root@machine:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/dm-0       7.2G  5.7G  1.2G  84% /
udev             10M     0   10M   0% /dev
tmpfs           403M  5.5M  397M   2% /run
tmpfs          1006M     0 1006M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs          1006M     0 1006M   0% /sys/fs/cgroup
/dev/sda1       236M   33M  191M  15% /boot

Physical Volumes

root@machine:~# pvs
  PV         VG               Fmt  Attr PSize  PFree
  /dev/sda5  debian-jessie-vg lvm2 a--  26.38g 18.62g

Virtual Groups

root@machine:~# vgs
  VG               #PV #LV #SN Attr   VSize  VFree
  debian-jessie-vg   1   2   0 wz--n- 26.38g 18.62g

Logical Volumes

root@machine:~# lvs
  LV     VG               Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root   debian-jessie-vg -wi-ao----   7.39g
  swap_1 debian-jessie-vg -wi-ao---- 376.00m

So I have one PV with 18 free GB (that’s thanks to the machine.ovf modification), one VG and two LVS. The one I want to increase is “root”.
Just a last check:

root@machine:~# pvscan
  PV /dev/sda5   VG debian-jessie-vg   lvm2 [26.38 GiB / 18.62 GiB free]
  Total: 1 [26.38 GiB] / in use: 1 [26.38 GiB] / in no VG: 0 [0   ]
root@machine:~# lvdisplay
  --- Logical volume ---
  LV Path                /dev/debian-jessie-vg/root
  LV Name                root
  VG Name                debian-jessie-vg
  LV UUID                OdIAov-a7qm-ThOR-58YP-D7FG-zq5n-r73dUq
  LV Write Access        read/write
  LV Creation host, time debian-jessie, 2015-04-27 10:42:28 +0200
  LV Status              available
  # open                 1
  LV Size                7.39 GiB
  Current LE             1892
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:0

  --- Logical volume ---
  LV Path                /dev/debian-jessie-vg/swap_1
  LV Name                swap_1
  VG Name                debian-jessie-vg
  LV UUID                dS5vEu-w8LQ-uoZd-IGk8-cmaK-8tBQ-ZtSyvO
  LV Write Access        read/write
  LV Creation host, time debian-jessie, 2015-04-27 10:42:28 +0200
  LV Status              available
  # open                 2
  LV Size                376.00 MiB
  Current LE             94
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:1

So the path for my LV is /dev/debian-jessie-vg/root

And…

root@machine:~# vgdisplay
  --- Volume group ---
  VG Name               debian-jessie-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               26.38 GiB
  PE Size               4.00 MiB
  Total PE              6754
  Alloc PE / Size       1986 / 7.76 GiB
  Free  PE / Size       4768 / 18.62 GiB
  VG UUID               V2oYD9-uoYy-sFLY-QSLG-FPyx-Ejce-QANYo4

…I have 4768 Free PE for it! :-)

So, let’s use them. I extend first the LV:

root@machine:~# lvextend -l +4768 /dev/debian-jessie-vg/root
  Size of logical volume debian-jessie-vg/root changed from 7.39 GiB (1892 extents) to 26.02 GiB (6660 extents).
  Logical volume root successfully resized

Then I resize the fs

root@machine:~# resize2fs /dev/debian-jessie-vg/root
resize2fs ... (it does it all automatically)

And that’s all!
Let’s check:

root@machine:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/dm-0        26G  5.7G   19G  24% /
udev             10M     0   10M   0% /dev
tmpfs           403M  5.5M  397M   2% /run
tmpfs          1006M     0 1006M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs          1006M     0 1006M   0% /sys/fs/cgroup
/dev/sda1       236M   33M  191M  15% /boot
root@machine:~# lvdisplay
  --- Logical volume ---
  LV Path                /dev/debian-jessie-vg/root
  LV Name                root
  VG Name                debian-jessie-vg
  LV UUID                OdIAov-a7qm-ThOR-58YP-D7FG-zq5n-r73dUq
  LV Write Access        read/write
  LV Creation host, time debian-jessie, 2015-04-27 10:42:28 +0200
  LV Status              available
  # open                 1
  LV Size                26.02 GiB
  Current LE             6660
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:0

  --- Logical volume ---
  LV Path                /dev/debian-jessie-vg/swap_1
  LV Name                swap_1
  VG Name                debian-jessie-vg
  LV UUID                dS5vEu-w8LQ-uoZd-IGk8-cmaK-8tBQ-ZtSyvO
  LV Write Access        read/write
  LV Creation host, time debian-jessie, 2015-04-27 10:42:28 +0200
  LV Status              available
  # open                 2
  LV Size                376.00 MiB
  Current LE             94
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           254:1

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Resizing LVMs

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