ClickHouse/docs/en/system_tables/system.clusters.rst

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system.clusters
---------------
Contains information about clusters available in the config file and the servers in them.
Columns:
.. code-block:: text
cluster String - Cluster name.
shard_num UInt32 - Number of a shard in the cluster, starting from 1.
shard_weight UInt32 - Relative weight of a shard when writing data.
replica_num UInt32 - Number of a replica in the shard, starting from 1.
host_name String - Host name as specified in the config.
host_address String - Host's IP address obtained from DNS.
port UInt16 - The port used to access the server.
user String - The username to use for connecting to the server.