View MNS logs in the OSS console

Usage notes

• MNS operations logs are generated at an interval of one minute and stored as OSS objects that comply with specific naming conventions in a specified OSS bucket.
• Operation logs of queues and topics have different paths. For more information about specific paths, see the following sections: Operation logs of queues and Operation logs of topics.
• The log files are stored in the JSON format. You can download and process log files.
• Each log file is a map. The key is the message ID and the value is multiple logs that record operations on the message. Each operations log contains multiple fields, such as Action and Time.
• Logs can be pushed from MNS to Log Service about 15 minutes after the logs are generated.

Prerequisites

• Log Service is activated.

  You can activate Log Service on the Log Service product page.

• Log Service is authorized to access OSS.

  You can go to the Cloud Resource Access Authorization page to authorize Log Service to access OSS.

Background information

• Real-time log query allows you to query logs from the past seven days free of charge. If the log retention time that you set is longer than seven days, Log Service charges the fees for the excess days. Extra fees are charged when you read data from or write data to Log Service over the Internet.
• Log Service allows you to store 900 GB of logs (equivalent to 900 million 1-KB log entries) per day free of charge, and charges fees for excess logs.

Enable real-time log query

You can use one of the following methods to enable real-time log query:

Method 1: Enable real-time log query when you create a bucket

1. Log on to the OSS console.
2. On the Overview page, click Create Bucket.
3. In the Create Bucket dialog box that appears, set Real-time Log Query to Enable.
   For more information about the configurations of other parameters, see Create buckets.
4. Click OK.

Method 2: Enable real-time log query on the overview page of a bucket

1. Log on to the OSS console.
2. Click Buckets, and then click the name of the target bucket.
3. Choose Logging > Real-time Log Query.
4. Click Activate Now.

Real-time log query allows you to query logs from the past seven days free of charge. You can click Config Log Retention Time in the upper-right corner to modify the retention time of logs.

Query real-time logs

You can use one of the following methods to query real-time logs:

Method 1: Query real-time logs on the Original Log page

1. Log on to the OSS console.
2. Click Buckets, and then click the name of the target bucket.
3. Choose Logging > Real-time Log Query.
4. Click Original Log to analyze logs.
   You can specify the time range and query statement in real-time log queries. For example, you can analyze the distribution of a specified field such as an API operation within a specified time range. You can also filter the query results by conditions to view required access records.

Method 2: Query real-time logs on the Dashboard page

1. Log on to the OSS console.
2. Click Buckets, and then click the name of the target bucket.
3. Choose Logging > Real-time Log Query.
4. Click Dashboard to analyze logs.
   Dashboard allows you to view four reports that are immediately available.

   • Access Center: displays the overall operating status including the PV, UV, traffic, and distribution of access over the Internet.
   • Audit Center: displays statistics on object operations including read, write, and delete operations on objects.
   • Operation Center: displays statistics on access logs including the number of requests and distribution of failed operations.
   • Performance Center: displays statistics on performance including the performance of downloads and uploads over the Internet, the performance of transmission over different networks or with different object sizes, and the list of differences between stored and downloaded objects.

Method 3: Query real-time logs in the Log Service console

You can view OSS access logs in the Log Service console. For more information, see OSS access logs.

Use the command-line tool to query logs

The command-line tool provides the queryqueuelog and querytopiclog commands. These commands allow you to specify a queue name, topic name, message ID, and time range to query operations logs. For more information, see Log query tool.