Proxmox LXC Disk Resize

Resize Disk (Host)

Run on the Proxmox host:

pct resize <CTID> rootfs +10G

Or set an exact size:

pct resize <CTID> rootfs 40G

Verify:

pct config <CTID>

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Verify (Inside Container)

pct enter <CTID>
df -h
lsblk

In most default setups (e.g. local-lvm + ext4 on LV), the filesystem expands automatically.

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If Manual Resize Is Needed

ext4

resize2fs /dev/mapper/pve-vm--<CTID>--disk--0

XFS

xfs_growfs /

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Tip

Before resizing, check what’s actually consuming space:

du -h --max-depth=1 / | sort -h