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Thomas Aichinger
Asked: 2020-12-08 12:44:12 +0800 CST

Resize partition from virtual machine without reboot

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I run several virtual ubuntu machines on a proxmox server. They all have a single disk without LVM. When disk space runs out I poweroff the virtual machine, then enlarge the partition, mount gparted ISO, boot from this ISO, resize the partition, and boot the vm again.

Now I wonder if there is a simpler way without rebooting the virtual machine.

partitioning virtualization

1 Answers

  1. Toggle some informations about the root filesystem:

    df /
# Filesystem     1K-blocks    Used Available Use% Mounted on
# /dev/sda2       31365948 5249140  24500424  18% /

    /dev/sda2 is the second partition of block device /dev/sda. To size up this partition, you can use the tool parted.

    parted /dev/sda
# (parted) resizepart 2
# Warning: Partition /dev/sda2 is being used. Are you sure you want to continue?
# Yes/No? yes
# End?  [41.0GB]? 82GB
# (parted) q
# Information: You may need to update /etc/fstab.

    After changing size of partition, you have to size up the filsystem too:

    resize2fs /dev/sda2
# resize2fs 1.45.5 (07-Jan-2020)
# Filesystem at /dev/sda2 is mounted on /; on-line resizing required
# old_desc_blocks = 4, new_desc_blocks = 9
# The filesystem on /dev/sda2 is now 18019403 (4k) blocks long.

    This is for checking modifications:

    df /
# Filesystem     1K-blocks    Used Available Use% Mounted on
# /dev/sda2       70817420 5253016  62349464   8% /
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