Alibaba Cloud Dynamic Route for CDN (DCDN) collects log data on an hourly basis. You can download the daily log data of a domain name collected within the last 30 days. This topic describes how to download log data, the usage notes, and the log fields.

Usage notes

The traffic usage of accelerated domain names that is queried by using the monitoring or resource usage feature available in the Alibaba Cloud DCDN console or by calling API operations differs from that collected in logs. Typically, the traffic usage of accelerated domain names that is queried by using the monitoring or resource usage feature is 1.1 times that collected in logs. For more information, see Why is the actual billed network traffic different from the network traffic reported by the logging feature?

Usage notes

  • Log update delay: In most cases, log data is generated within 24 hours after an event occurs. However, in some cases, it may take more than 24 hours to generate log data.
  • Naming rule for log entries: Accelerated domain name_year_month_day_start time_end time[extension field].gz. The extension field starts with an underscore (_). Example: aliyundoc.com_2018_10_30_000000_010000_xx.gz.
    Note Some log entries may not contain an extension field. Example: example.com_2018_10_30_000000_010000.gz.

Log fields and descriptions

  • Sample log entry
    [9/Jun/2015:01:58:09 +0800] - 1542 "-" "GET" 200 191 2830 MISS "Mozilla/5.0 (compatible; AhrefsBot/5.0; +" "text/html"
  • Fields
    Field Description
    [9/Jun/2015:01:58:09 +0800] The start time of the log entry. The IP address of the client that initiated the request.
    - The IP address of the proxy.
    1542 The response time. Unit: milliseconds.
    "-" The Referer header in HTTP requests.
    GET The request method. The request URL.
    200 The HTTP status code.
    191 The size of the request. Unit: bytes.
    2830 The size of the response. Unit: bytes.
    MISS The cache hit status. Valid values:
    • HIT: The request results in a cache hit on DCDN nodes and the request does not need to be redirected to the origin server.
    • MISS: The request results in a cache miss on DCDN nodes and the request is redirected to L2 DCDN nodes or the origin server.
    Note DCDN collects log data from DCDN nodes, excluding back-to-origin information of L2 DCDN nodes. If the field value is MISS, back-to-origin information is not provided. Therefore, the log data does not show if a request that is a cache miss is redirected to the origin server.
    Mozilla/5.0(compatible; AhrefsBot/5.0; + The User-Agent header.
    text/html The file type.
    quic/https/http The protocol over which the request was transmitted.
    Note Other fields:
    • DYNAMIC: Dynamic request.
    • CHARGE: The request is billed.
    • NOTLAST: A reserved field, which has no meaning.


  1. Log on to the DCDN console.
  2. In the left-side navigation pane, choose Data Center > Logs > Offline Log.
  3. On the Log Download tab, select a domain name and a date and click Query.
  4. Find the log file that you want to download and click Download in the Actions column.

Related API operations

DescribeDcdnDomainLog: queries the address where you can download offline logs of a specific domain name.