ClickHouse/tests/integration/test_reload_clusters_config/configs/remote_servers.xml

<clickhouse>
    <remote_servers>
        <test_cluster>
            <shard>
                <internal_replication>true</internal_replication>
                <replica>
                    <host>node_1</host>
                    <port>9000</port>
                </replica>
                <replica>
                    <host>node_2</host>
                    <port>9000</port>
                </replica>
            </shard>
        </test_cluster>
        <test_cluster2>
            <shard>
                <internal_replication>true</internal_replication>
                <replica>
                    <host>node_1</host>
                    <port>9000</port>
                </replica>
                <replica>
                    <host>node_2</host>
                    <port>9000</port>
                </replica>
            </shard>
        </test_cluster2>
    </remote_servers>
</clickhouse>