https://github.com/EugenMayer/parted-auto-resize

Automatically or non-interactive resize a partition to its maximum, e.g. for LVM pv resizing when using a partition as PV
https://github.com/EugenMayer/parted-auto-resize

hypervisor linux lvm parted

Last synced: about 2 months ago
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Automatically or non-interactive resize a partition to its maximum, e.g. for LVM pv resizing when using a partition as PV

• Host: GitHub
• URL: https://github.com/EugenMayer/parted-auto-resize
• Owner: EugenMayer
• License: mit
• Created: 2017-08-26T17:37:50.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2020-05-23T09:43:03.000Z (over 4 years ago)
• Last Synced: 2024-02-13T21:51:12.151Z (7 months ago)
• Topics: hypervisor, linux, lvm, parted
• Language: Shell
• Size: 15.6 KB
• Stars: 63
• Watchers: 4
• Forks: 14
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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README

        
## WAT

in short `resize a partition non-interactive to its maximum size`

#### The long story..

Since using fdisk in this case is pretty complicated due to the case that non-interactive ways are probably not possible or very complicated using printf, i want to use `parted resizepart` for resizing a partition to its maximum size.

This can be used in scenarios like disk-resizes ( hypervisor / virtualization ). Now you need to adjust your logical volume / pv to the new size (LVM case) or you want to adjust the partition size of a normal partition.

So lets assume i want to resize partition /dev/sda1 on disk /dev/sda to its maximum possible size - how would i do this without getting asked any questions at all.

Eventhough `parted /dev/sda resizepart 1` exists, it needs **me to calculate** and enter the maximum disk size - so how to automate this would be the next question - and the answer was the reason `parted auto resize` has been written.

## Installation

```bash

  curl -o /usr/local/bin/resize.sh https://raw.githubusercontent.com/EugenMayer/parted-auto-resize/master/resize.sh

 ```

 

### Dependencies

- parted 3.0 or higher (otherwise probably rename `parted resizepart` to `parted resize`)

## Usage 

Save the script above as `resize.sh` and make it executable

    

    # resize the fourth partition to the maximum size, so /dev/sda4

    # this is the sandbox mode, so no changes are actually done - just previewed

    ./resize.sh /dev/sda 4

    # apply those changes

    ./resize.sh /dev/sda 4 apply

## Scenarios / motivation

Since debian does not allow you to preseed a LVM configuration, which uses a disk as a pv / vg, but always force you to use a partition, you need a convinient way to resize the pv partition, so you can resize any logical volumes. It can be done using fdisk, but this needs ot be done by hand, interactive with a lot more steps ( usual delete / create / set type to Linux LVM / write / reload partition table 

Assuming your pv / vg is created on /dev/sdb1 named vgdata and the LV to resize is named data and you resized your disk using your hypervisor.

Now using this script, all you do is

    ./resize.sh /dev/sdb 1 apply

    pvresize /dev/sdb1

    lvextend -r /dev/mapper/vgdata-data -l '+100%FREE'

thats it! Note, if you happen to notice -r in lvextend, yes thats pretty cool, it calls `resize2fs /dev/mapper/vgdata-data` for us automatically after the partition resize ( to adjust the filesystem size )