Today I had to resize a logical volume inside an extended partition and I thought maybe this could be helpful for someone.

The resize is quite easy and you have to follow those few steps:

First of all you have to extend the "physical" disk itself. The easiest scenario would be a virtual machine where you could resize the disk at the CLI or via your VM management tool. Not all virtualization layer supports live resizing of a disk, so maybe you have to shut down, resize and start the VM again:

root@jenkins:~# fdisk /dev/vda

Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p
Disk /dev/vda: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1d68d97a

Device     Boot   Start      End  Sectors  Size Id Type
/dev/vda1  *       2048   999423   997376  487M 83 Linux
/dev/vda2       1001470 20969471 19968002  9.5G  5 Extended
/dev/vda5       1001472 20969471 19968000  9.5G 8e Linux LVM

Command (m for help): d
Partition number (1,2,5, default 5): 2

Partition 2 has been deleted.

Command (m for help): n
Partition type
   p   primary (1 primary, 0 extended, 3 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (2-4, default 2):
First sector (999424-41943039, default 999424): 1001472
Last sector, +sectors or +size{K,M,G,T,P} (1001472-41943039, default 41943039):

Created a new partition 2 of type 'Linux' and of size 19.5 GiB.

Command (m for help): t
Partition number (1,2, default 2):
Partition type (type L to list all types): 8e

Changed type of partition 'Linux' to 'Linux LVM'.

Command (m for help): p
Disk /dev/vda: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x1d68d97a

Device     Boot   Start      End  Sectors  Size Id Type
/dev/vda1  *       2048   999423   997376  487M 83 Linux
/dev/vda2       1001472 41943039 40941568 19.5G 8e Linux LVM

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Device or resource busy

The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).

# reboot

root@jenkins:~# pvresize /dev/vda2
Physical volume "/dev/vda2" changed
1 physical volume(s) resized / 0 physical volume(s) not resized

root@jenkins:~# lvresize -L+8.5G /dev/ubuntu-temp-vg/root
Size of logical volume ubuntu-temp-vg/root changed from 10.00 GiB (2560 extents) to 18.50 GiB (4736 extents).
Logical volume root successfully resized.

root@jenkins:~# resize2fs /dev/ubuntu-temp-vg/root
resize2fs 1.42.13 (17-May-2015)
Filesystem at /dev/ubuntu-temp-vg/root is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 2
The filesystem on /dev/ubuntu-temp-vg/root is now 4849664 (4k) blocks long.

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