Technical

Proxmox API create VM cluster not per node: why /nodes/{node}/qemu is the only way

Proxmox API create VM cluster not per node — the endpoint is /nodes/{node}/qemu because VMs are node-bound.

NguyenNovember 4, 20262 min read

Technical

How to Power Off Proxmox Node Safely

How to power off a Proxmox node without killing VMs or breaking quorum. Check HA and cluster state, then use the GUI or shutdown command.

NguyenNovember 3, 20262 min read

Technical

Proxmox snippets feature: enable storage, upload files, wire them into cloud-init and hookscripts

Proxmox snippets are small text files for cloud-init and hookscripts. Here's how to enable snippet storage, upload files, and reference them in your VMs.

NguyenNovember 3, 20262 min read

Technical

Proxmox Unresponsive After 1 or 2 Days: Check the Kernel Ring Buffer First

Proxmox unresponsive after 1 or 2 days? Start with dmesg and hung task traces, then check ZFS ARC, C-states, and RAM. Here's the order I'd follow.

NguyenNovember 2, 20263 min read

Technical

Proxmox VM Summary Memory Usage Higher Than Guest: Which Number Is Real

The Proxmox VM summary memory usage is higher than guest because it counts the QEMU process RSS, not just what the guest sees. Here's how to read the gap.

NguyenNovember 2, 20262 min read

Technical

LVM thin in the same VG as virtual machines: yes, you can mix them

You can mix LVM-thin and regular LVM volumes in the same Proxmox volume group. Here's the storage.cfg setup and the thin pool exhaustion caveat.

NguyenNovember 1, 20262 min read

Technical

Proxmox exclude disk from snapshot: move it to a storage that doesn’t support snapshots

Proxmox has no per-disk snapshot toggle. To exclude a disk from a VM snapshot, move it to a storage that doesn't support snapshots, like a directory or NFS

NguyenNovember 1, 20262 min read

Technical

vzdump Backup Retention Off-Site Transfer: Prune Copies After They Leave

Retention for vzdump backups after off-site transfer means pruning both local and remote copies. Here's the script I'd run and when PBS is worth it.

NguyenOctober 31, 20262 min read

Technical

Proxmox Hookscript Not Running: Trace the Invocation Path and Fix It

Proxmox hookscript not running? Check the executable bit, storage enablement, and task log output.

NguyenOctober 31, 20262 min read

Technical

Disable server shutdown/restart from the web interface with a custom Proxmox role

Disable server shutdown/restart from the web interface by creating a role without Sys.PowerMgmt and assigning it to users.

NguyenOctober 30, 20262 min read