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How to access the binary log of a Managed MySQL database?

Posted September 25, 2019 3.1k views
MySQLDigitalOceanLogging

Hello, I’m just starting with a managed MySQL database and I’m wondering if it has the binary log feature enabled and if there is a way to access it somehow?

Binary log documentaion: https://dev.mysql.com/doc/refman/8.0/en/binary-log.html

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rodion
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rodion

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bobbyiliev September 26, 2019

Hello,

Yes, it is enabled:

mysql> show variables like 'log_bin';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin       | ON    |
+---------------+-------+
1 row in set (0.00 sec)

I think that it is necessary for the MySQL replication and it is used by the read-only replicas. However, I don’t believe that you would be able to access them as this is a managed service.

Is there a particular reason why you need to access the bin logs?

Regards,
Bobby

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  • rodion September 26, 2019

    Thank you for your reply.

    We want to access the binary log to investigate the possibility of using it to track data changes if necessary, instead of setting up manually a changelog system (since the binary log is already logging the information that we need).

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    • bobbyiliev October 2, 2019

      Hello,

      I’ve tried testing that at my end and as I was able to get the following information with the default doadmin user:

      mysql> show binary logs;

      Output:

      +---------------+-----------+-----------+
| Log_name      | File_size | Encrypted |
+---------------+-----------+-----------+
| binlog.004618 |       239 | No        |
| binlog.004619 |       239 | No        |
| binlog.004620 |       195 | No        |
+---------------+-----------+-----------+

      Then I was able to check the events:

      mysql> show binlog events in 'binlog.004618';

      Output:

      +---------------+-----+----------------+-----------+-------------+---------------------------------------------+
| Log_name      | Pos | Event_type     | Server_id | End_log_pos | Info                                        |
+---------------+-----+----------------+-----------+-------------+---------------------------------------------+
| binlog.004618 |   4 | Format_desc    |         6 |         124 | Server ver: 8.0.16, Binlog ver: 4           |
| binlog.004618 | 124 | Previous_gtids |         6 |         195 | 325feaec-d84b-11e9-8d90-4e7391931de6:1-1042 |
| binlog.004618 | 195 | Rotate         |         6 |         239 | binlog.004619;pos=4                         |
+---------------+-----+----------------+-----------+-------------+---------------------------------------------+

      However, I don’t think that you could access the binary logs directly with a tool like mysqlbinlog as you need direct access to the files via SSH for example.

      If you wish, you could try getting in touch with DigitalOcean’s support team and cross-checking if you could get direct access to the files somehow, but as this is a managed service it is quite unlikely:

      https://www.digitalocean.com/company/contact/#support

      Hope that this helps!
      Regards,
      Bobby

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