ClickHouse/tests/integration/test_storage_s3_queue/configs/zookeeper.xml

<clickhouse>
    <zookeeper>
        <node index="1">
            <host>zoo1</host>
            <port>2181</port>
        </node>
        <node index="2">
            <host>zoo2</host>
            <port>2181</port>
        </node>
        <node index="3">
            <host>zoo3</host>
            <port>2181</port>
        </node>
    </zookeeper>

    <remote_servers>
        <default>
            <shard>
                <replica>
                    <host>instance</host>
                    <port>9000</port>
                </replica>
                <replica>
                    <host>instance2</host>
                    <port>9000</port>
                </replica>
            </shard>
        </default>
    </remote_servers>
</clickhouse>