ClickHouse/tests/integration/test_cluster_copier/configs/conf.d/clusters.xml

<yandex>
<remote_servers>

    <cluster0>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s0_0_0</host>
                <port>9000</port>
            </replica>
            <replica>
                <host>s0_0_1</host>
                <port>9000</port>
            </replica>
        </shard>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s0_1_0</host>
                <port>9000</port>
            </replica>
        </shard>
    </cluster0>

    <cluster1>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s1_0_0</host>
                <port>9000</port>
            </replica>
            <replica>
                <host>s1_0_1</host>
                <port>9000</port>
            </replica>
        </shard>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s1_1_0</host>
                <port>9000</port>
            </replica>
        </shard>
    </cluster1>

    <shard_0_0>
        <shard>
            <internal_replication>true</internal_replication>
            <replica>
                <host>s0_0_0</host>
                <port>9000</port>
            </replica>
            <replica>
                <host>s0_0_1</host>
                <port>9000</port>
            </replica>
        </shard>
    </shard_0_0>

    <source_trivial_cluster>
        <shard>
            <replica>
                <host>s0_0_0</host>
                <port>9000</port>
            </replica>
        </shard>
    </source_trivial_cluster>


    <destination_trivial_cluster>
        <shard>
            <replica>
                <host>s1_0_0</host>
                <port>9000</port>
            </replica>
        </shard>
    </destination_trivial_cluster>

</remote_servers>
</yandex>