override-config.xml

<clickhouse>
    <listen_host>::</listen_host>

    <logger>
        <level>information</level>
        <formatting>
            <type>json</type>
        </formatting>
    </logger>

    <!-- limit the maximum number of simultaneously processed queries - choose 2*cpu_cores (default: unlimited) -->
    <max_concurrent_queries>4</max_concurrent_queries>

    <!-- lower mark cache size from 5GB to 1GB -->
    <mark_cache_size>1073741824</mark_cache_size>

    <!-- lower memory requirements at the expense of slower merges - choose 1024 to 4096 (default: 8192) -->
    <merge_max_block_size>1024</merge_max_block_size>

    <!-- control the maximum total parts size to be merged into one part - choose 1 to 4GB (default: 150GB) -->
    <max_bytes_to_merge_at_max_space_in_pool>1073741824</max_bytes_to_merge_at_max_space_in_pool>

    <merge_tree>
        <number_of_free_entries_in_pool_to_lower_max_size_of_merge>0</number_of_free_entries_in_pool_to_lower_max_size_of_merge>
    </merge_tree>

    <timezone>UTC</timezone>

    <url_scheme_mappers>
        <gs>
            <from>gs://{bucket}/</from>
            <to from_env="GOOGLE_STORAGE_BUCKET_ENDPOINT"></to>
        </gs>
    </url_scheme_mappers>

    <s3>
        <gs_endpoint>
            <endpoint>https://storage.googleapis.com</endpoint>
            <access_key_id from_env="GOOGLE_STORAGE_HMAC_KEY_ID"></access_key_id>
            <secret_access_key from_env="GOOGLE_STORAGE_HMAC_KEY_SECRET"></secret_access_key>
        </gs_endpoint>
    </s3>

    <s3queue_log>
        <database>system</database>
        <table>s3queue_log</table>
    </s3queue_log>

    <keeper_server>
        <tcp_port>2181</tcp_port>
        <server_id>1</server_id>
        <coordination_settings>
            <operation_timeout_ms>10000</operation_timeout_ms>
            <session_timeout_ms>30000</session_timeout_ms>
            <raft_logs_level>warning</raft_logs_level>
        </coordination_settings>
        <raft_configuration>
            <server>
                <id>1</id>
                <hostname>127.0.0.1</hostname>
                <port>9444</port>
            </server>
        </raft_configuration>
    </keeper_server>
</clickhouse>