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Cluster

The Cluster page visualizes your ClickHouse cluster topology, replication health, and node status.

Cluster Topology​

An interactive 3D diagram of your cluster's structure:

  • Shards shown as enclosures containing their replica nodes
  • Keeper/ZooKeeper nodes displayed separately with connection lines to the cluster
  • Nodes are color-coded by health: green (healthy), red (error), blue (local node), purple (Keeper)
  • Hover over any node to see its version, uptime, CPU cores, load, and memory usage

Replication Health​

A per-database view of replication status:

  • Replicated vs. non-replicated engine types
  • Active and total replica counts per database
  • Leader status
  • Max replication delay (color-coded: red if over 300s, orange if over 60s)
  • Replication queue size

Cluster Nodes​

A table of all nodes in the cluster showing:

  • Host, address, and port
  • Shard and replica numbers
  • Error and slowdown counts

For single-node setups without a cluster configuration, the page shows a simplified summary.