ClickHouse/tests/integration/test_alternative_keeper_config/configs/zookeeper_config.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>
        <session_timeout_ms>3000</session_timeout_ms>
    </zookeeper>
</clickhouse>