ClickHouse/tests/integration/test_cluster_copier/configs/config-copier.xml

<clickhouse>
    <logger>
        <level>information</level>
        <log>/var/log/clickhouse-server/copier/log.log</log>
        <errorlog>/var/log/clickhouse-server/copier/log.err.log</errorlog>
        <size>1000M</size>
        <count>10</count>
        <stderr>/var/log/clickhouse-server/copier/stderr.log</stderr>
        <stdout>/var/log/clickhouse-server/copier/stdout.log</stdout>
    </logger>
</clickhouse>