clickhouse-cluster.xml

<?xml version="1.0"?>
<clickhouse>
    <!-- ZooKeeper is used to store metadata about replicas, when using Replicated tables.
         Optional. If you don't use replicated tables, you could omit that.

         See https://clickhouse.com/docs/en/engines/table-engines/mergetree-family/replication/
      -->
    <zookeeper>
        <node index="1">
            <host>zookeeper-1</host>
            <port>2181</port>
        </node>
        <!-- <node index="2">
            <host>zookeeper-2</host>
            <port>2181</port>
        </node>
        <node index="3">
            <host>zookeeper-3</host>
            <port>2181</port>
        </node> -->
    </zookeeper>

    <!-- Configuration of clusters that could be used in Distributed tables.
         https://clickhouse.com/docs/en/operations/table_engines/distributed/
      -->
    <remote_servers>
        <cluster>
            <!-- Inter-server per-cluster secret for Distributed queries
                 default: no secret (no authentication will be performed)

                 If set, then Distributed queries will be validated on shards, so at least:
                 - such cluster should exist on the shard,
                 - such cluster should have the same secret.

                 And also (and which is more important), the initial_user will
                 be used as current user for the query.

                 Right now the protocol is pretty simple and it only takes into account:
                 - cluster name
                 - query

                 Also it will be nice if the following will be implemented:
                 - source hostname (see interserver_http_host), but then it will depends from DNS,
                   it can use IP address instead, but then the you need to get correct on the initiator node.
                 - target hostname / ip address (same notes as for source hostname)
                 - time-based security tokens
            -->
            <!-- <secret></secret> -->
            <shard>
                <!-- Optional. Whether to write data to just one of the replicas. Default: false (write data to all replicas). -->
                <!-- <internal_replication>false</internal_replication> -->
                <!-- Optional. Shard weight when writing data. Default: 1. -->
                <!-- <weight>1</weight> -->
                <replica>
                    <host>clickhouse</host>
                    <port>9000</port>
                    <!-- Optional. Priority of the replica for load_balancing. Default: 1 (less value has more priority). -->
                    <!-- <priority>1</priority> -->
                </replica>
            </shard>
            <!-- <shard>
                <replica>
                    <host>clickhouse-2</host>
                    <port>9000</port>
                </replica>
            </shard>
            <shard>
                <replica>
                    <host>clickhouse-3</host>
                    <port>9000</port>
                </replica>
            </shard> -->
        </cluster>
    </remote_servers>
</clickhouse>