Resize your Cloud VPS: upgrade CPU, RAM, and disk
Upgrade your UnderHost Cloud VPS to a larger plan when you need more CPU, RAM, or storage. What happens during a resize and how to request it.
UnderHost NOC
Network Operations
If your VPS is consistently running out of RAM, CPU headroom, or disk space, it's time to upgrade to a larger plan. Resizing your VPS at UnderHost is handled through CustomerPanel-most upgrades require only a brief maintenance window.
When to upgrade your VPS
| Symptom | Resource to upgrade |
|---|---|
| Out-of-memory kills (OOM), swapping heavily, MySQL crashes | RAM |
| High load average consistently above CPU core count | CPU |
| Disk almost full, unable to write logs or temp files | Disk |
| General slowness under load | Usually RAM + CPU together |
Upgrade process
- Log in to customerpanel.ca
- Go to Services → My Services → your VPS
- Click Upgrade/Downgrade (or open a support ticket if the option is not visible)
- Select the new plan
- Review the cost-upgrades are typically prorated for the remaining billing period
- Confirm the upgrade
If the self-service upgrade option is not available in your CustomerPanel, open a support ticket requesting the upgrade and specifying the target plan.
Downtime and preparation
Most VPS upgrades require the server to be briefly powered off and resized. Typical downtime is 5–15 minutes. Prepare by:
- Taking a snapshot before the upgrade (rollback option if anything goes wrong)
- Scheduling the upgrade during a low-traffic window
- Notifying users if the site needs to be offline
After the upgrade, your server boots with the new resource allocation. Verify with free -m (RAM) and nproc (CPU cores) after SSH reconnect.
After a disk upgrade-expand the filesystem
After a disk upgrade, the new disk space is allocated but not always automatically available to the OS. You may need to expand the partition and filesystem:
# Check current disk usage
df -h
# If the disk grew but / didn't expand, resize partition:
# For ext4 filesystem:
resize2fs /dev/vda1
# For xfs filesystem (AlmaLinux):
xfs_growfs /If you're unsure how to expand the filesystem safely, open a support ticket after the upgrade-the UnderHost team can perform the expansion with managed server support.
Related: How to manage your Cloud VPS | VPS snapshots-create and restore server images | VPS resource monitoring and usage tracking | What is a VPS and how does Cloud VPS work?
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