Slow queries can degrade the overall performance of a MySQL cluster, so they need to be monitored closely and addressed promptly.

Fluentd can be set up to parse and collect data from MySQL's slow query logs. Applications include:

  1. Sending email alerts if the query time exceeds a particular threshold.
  2. Generate real-time statistics on slow queries by using Elasticsearch as the search backend.


  1. Install the MySQL slow query plugin by running the following command

    $ fluent-gem install fluent-plugin-mysqlslowquery
  2. Open your Fluentd configuration file and add the following lines:

      type mysql_slow_query
      path /path/to/mysqld-slow.log
      tag mysqld.slow_query

    For example, in most cases, the slow query log is located at /var/log/mysql/slow.log, so the above config would be

        type mysql_slow_query
        path /var/log/mysql/slow.log
        tag mysqld.slow_query

    If you are not sure where you slow query logs are, ask the DBA or look into my.cnf

What's Next?

It's time to configure data outputs. Here are some examples.


Want to learn the basics of Fluentd? Check out these pages.

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