ClickHouse/tests/integration/test_zookeeper_config/configs/zookeeper_config_with_ssl.xml

<yandex>
    <zookeeper>
        <node index="1">
            <host>zoo1</host>
            <port>2281</port>
            <secure>1</secure>
        </node>
        <node index="2">
            <host>zoo2</host>
            <port>2281</port>
            <secure>1</secure>
        </node>
        <node index="3">
            <host>zoo3</host>
            <port>2281</port>
            <secure>1</secure>
        </node>
        <session_timeout_ms>3000</session_timeout_ms>
    </zookeeper>
</yandex>