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    COS Access Log Analysis

    Terakhir diperbarui:2024-12-16 16:48:53
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      Overview

      Cloud Object Storage (COS) access logs record information about users' access to COS resources, including object upload (PUT), object deletion (DELETE), and object getting (GET). By analyzing access logs, you can perform audit backtracking, such as deleting resource records and collecting statistics on popular resources. This document introduces how to analyze COS access logs.

      Prerequisite

      COS logs have been collected to Cloud Log Service (CLS). For more information, please see Enabling Real-Time Log Feature on COS.

      Introduction to Access Logs

      COS access logs record information such as the source bucket, user ID, and request method.
      No.
      Field
      Description
      Example
      1
      eventVersion
      Log version
      1.0
      2
      bucketName
      Bucket name
      examplebucket-1250000000
      3
      qcsRegion
      Request region
      ap-beijing
      4
      eventTime
      Event time (request end time, which is a timestamp in UTC+0 time zone)
      2018-12-01T11:02:33Z
      5
      eventSource
      Access domain name
      examplebucket-1250000000.cos.ap-guangzhou.myqcloud.com
      6
      eventName
      Event name
      UploadPart
      7
      remoteIp
      Source IP
      192.168.0.1
      8
      userSecretKeyId
      User access KeyId
      AKIDNYVCdoJQyGJ5brTf
      9
      reservedField
      Reserved field
      Displayed as -
      10
      reqBytesSent
      Request bytes
      83886080
      11
      deltaDataSize
      Change in storage made by the request (in bytes)
      808
      12
      reqPath
      Requested file path
      /folder/text.txt
      13
      reqMethod
      Request method
      put
      14
      userAgent
      User agent (UA)
      cos-go-sdk-v5.2.9
      15
      resHttpCode
      HTTP return code
      404
      16
      resErrorCode
      Error code
      NoSuchKey
      17
      resErrorMsg
      Error message
      The specified key does not exist.
      18
      resBytesSent
      Bytes returned
      197
      19
      resTotalTime
      Total time used by the request (in milliseconds, i.e., the time between the last byte of the response and the first byte of the request)
      4295
      20
      logSourceType
      Source type of the log
      USER (user access requests), CDN (CDN origin-pull requests)
      21
      storageClass
      Storage class
      STANDARD, STANDARD_IA, ARCHIVE
      22
      accountId
      Bucket owner ID
      100000000001
      23
      resTurnAroundTime
      Time used by the request server (in milliseconds, i.e., the time between the first byte of the response and the last byte of the request)
      4295
      24
      requester
      Requester
      Root account ID, sub-account ID, or - (anonymous access)
      25
      requestId
      Request ID
      NWQ1ZjY4MTBfMjZiMjU4NjRfOWI1N180NDBiYTY=
      26
      objectSize
      Object size, in bytes
      808. If you use multipart upload, objectSize will only be displayed when the upload is completed, and will be - during the multipart upload process
      27
      versionId
      Object version ID
      Random string
      28
      targetStorageClass
      Destination storage class, recorded for replication requests
      STANDARD, STANDARD_IA, ARCHIVE
      29
      referer
      HTTP referer of the request
      *.example.com or 111.111.111.1
      30
      requestUri
      Request URI
      "GET /fdgfdgsf%20/%E6%B5%AE%E7%82%B9%E6%95%B0 HTTP/1.1"

      Examples

      Example 1: audit backtracking

      Requirement

      An object file cannot be accessed, and the cause needs to be located.

      Solution

      Go to the COS access log search page, and enter the object name as the keyword to search for logs.
      json-log2019-05-09_00645d9a-1118-4d69-8411-cfd57ede9ea1_000
      According to the time column chart, 14 logs are recorded on the last day. For the drill-down analysis of the 14 log records, click the quick analysis bar on the left to view the resHttpCode information.
      According to the quick analysis, there are 6 request log records whose resHttpCode is not 200: resHttpCode is 403 for 5 log records and 204 for 1 log record. Click to search for these logs quickly.
      According to the logs, the 5 log records whose error code is Access Deny are object access failure logs. According to the logs whose resHttpCode is 204, object access failed because user 1000****** performed object deletion at around 20:16 on August 24 in the COS console.

      Example 2: operations statistics

      Requirement

      Collect statistics on the top 10 most visited buckets of the day
      Collect statistics on the access trend of a certain bucket
      Collect statistics on the top 10 visitors of the error requests
      Collect statistics on the bucket distribution of the failed operations
      User request efficiency trend

      Solution

      Collect statistics on the top 10 most visited buckets of the day
      (reqMethod:"GET") | select bucketName, count(*) group by bucketName
      Collect statistics on the access trend of a certain bucket
      * | select time_series(TIMESTAMP, '1m', '%Y-%m-%dT%H:%i:%s+08:00', '0') AS time, count(*) as pv, reqMethod group by time, reqMethod order by time limit 200
      Collect statistics on the top 10 visitors of the error requests
      resHttpCode:>200 | select remoteIp, count(*) group by remoteIp
      Collect statistics on the bucket distribution of the failed operations
      resHttpCode:>200 | select bucketName, count(*) group by bucketName
      User request efficiency trend
      * | select time_series(__TIMESTAMP__, '5m', '%Y-%m-%d %H:%i:%s', '0')  as time,round(sum(case when resHttpCode=200 then 1.00 else 0.00 end) / cast(count(*) as double) * 100,1) as "Request Efficiency" group by time limit 1000
      User request source distribution
      * | select ip_to_province(remoteIp) as province ,  count(*) as c group by province order by c desc limit 50
      
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