Resizing a Volume on Ubuntu VM
Resizing a Volume on Ubuntu VM
At home I use Proxmox as my hypervisor. I have a base template for any Linux based server I want to deploy, but it only has 32GB of disk space. Lately, I’ve been playing around with Elastisearch and I needed to increase that disk size, due to log collection. The following is an outline of the steps I took to increase the size disk size.
- Resize disk in Proxmox
- Use fdisk to learn current layout and if Proxmox resize worked
- Use parted to fix the GPT PMBR size mismatch
- Use parted to resize the correct partition number
- Use resize2fs to resize the actual file system
First resize the disk in Proxmox
The example below, we are resizing from 32 GB to 64 GB. So we want to increase the size by 32 GB.
- Select the Hard Disk on the VM you want to resize
- Select Disk Action
- Select Resize
Easy peezy! 
Resize the volume in Ubuntu
Now that we increased the size of the disk, we need to tell our OS - Ubuntu 20.04 - that we want to use this newly available storage space.
Below screenshots are from when I increased a disk to 90 GB for another project
We’ll use parted to resize the volume
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parted /dev/sda
Then this command, print
Next you’ll get a warning which allows you to “correct” the first error:
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Warning: Not all of the space available to /dev/sda appears to be used, you can fix the
GPT to use all of the space (an extra 146800640 blocks) or
continue with the current setting?
Fix/Ignore?
To fix it, just type F or Fix
Next you’ll see this output, indicating our 80 GB drive is to be enlarged and it’s partition # 1:
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Disk Flags:
Number Start End Size File system Name Flags
14 1049kB 5243kB 4194kB bios_grub
15 5243kB 116MB 111MB fat32 boot, esp
1 116MB 85.9GB 85.8GB ext4
Now resize the partition
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(parted) resizepart 1
Warning: Partition /dev/sda1 is being used. Are you sure you want to continue?
Yes/No? Y
It will tell you the partition is in use and ask if it’s safe to continue.
Next tell the system to use all the new space by typing 100%
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End? [85.9GB]? 100%
quit
Resize the filesystem
At this point you still have to resize the file system
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# resize2fs /dev/sda1
resize2fs 1.45.5 (07-Jan-2020)
Filesystem at /dev/sda1 is mounted on /; on-line resizing required
old_desc_blocks = 10, new_desc_blocks = 19
The filesystem on /dev/sda1 is now 39293179 (4k) blocks long.
Check if resize worked by typing df -h
Reference
Resize Proxmox Volume with LVM
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