Cluster
Articles in Cluster.
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How to Check Cluster Health and Quorum Status in Proxmox VE (pvecm status Explained)
Learn what quorum means in a Proxmox VE cluster, how to read pvecm status and pvecm nodes output, and how to recover a cluster that's stuck read-only after losing quorum.
What Is /etc/pve (pmxcfs) in Proxmox VE? A Beginner's Guide to the Cluster Filesystem
Every VM config file in Proxmox VE somehow shows up identically on every node, with no NFS mount or sync job in sight. Here's what pmxcfs actually is, how it works, and what to do when /etc/pve goes read-only.
How to Create a Proxmox VE Cluster and Add Nodes (Step-by-Step Guide for Beginners)
Ready to move past a single Proxmox box? Here is how to actually create a cluster, join a second node, and confirm quorum is working, using both the web GUI and pvecm from the shell.
Tuning Corosync Link Priority and Token Timeouts for Proxmox VE Cluster Resilience
Proxmox VE corosync redundancy only works if knet actually prefers the right link. Here's how to set link priority correctly, read corosync-cfgtool output, and avoid tuning the token timeout blind.
Setting Up a Corosync QDevice for Two-Node Proxmox VE Cluster Quorum
A two-node Proxmox VE cluster loses quorum the moment one node reboots. Here's why the vote math breaks down and how to fix it permanently with an external corosync QDevice as a tie-breaker.
What Is a Proxmox Cluster? (And Do You Actually Need One?)
Clustering sounds like something only data centers need, but it's really just several Proxmox nodes agreeing to share one view. Here's what Corosync and quorum actually mean, and when you genuinely need a cluster versus when you don't.
Troubleshooting Corosync Cluster Communication Failures in Proxmox VE
A practical field guide to diagnosing and fixing corosync communication failures in Proxmox VE clusters, covering symptoms, root causes, diagnostic commands, redundant link configuration, and best practices to prevent HA fencing incidents.
Preventing Split-Brain in Two-Node Proxmox VE Clusters with a Corosync QDevice
How to deploy a Corosync QDevice so a two-node Proxmox VE cluster keeps quorum and High Availability working through a single node failure.