Filesystem Doesn't Reflect Instance Resize (Ephemeral)

Problem

An OpenStack instance, leveraging an ephemeral, non-boot-from-volume disk for its root partition, has been resized, but, the file system does not reflect the increased size (e.g. according to thedf output).

Environment

• Platform9 Managed OpenStack - All Versions
• Nova

Cause

The respective filesystem has yet to be expanded within the guest OS.

Resolution

Ext2/3/4

1. Leverage the resize2fs utility to resize the EXT filesystem.

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# resize2fs /dev/sda1

- If the root partition is provisioned using LVM, you may need to expand the associated LV and then specify the path to it on the filesystem, e.g.

# resize2fs /dev/mapper/vg-root

XFS

1. Leverage the xfs_growfs utility to resize the XFS filesystem.

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# xfs_growfs /dev/sda1