Charmed MySQL Explanation | Audit Logs

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Audit Logs

The Audit Log plugin allows all login/logout records to be stored in a log file. It is enabled in Charmed MySQL by default.

Overview

The following is a sample of the audit logs, with format json with login/logout records:

{"audit_record":{"name":"Quit","record":"6_2024-09-03T01:53:14","timestamp":"2024-09-03T01:53:33Z","connection_id":"992","status":0,"user":"clusteradmin","priv_user":"clusteradmin","os_login":"","proxy_user":"","host":"localhost","ip":"","db":""}}
{"audit_record":{"name":"Connect","record":"7_2024-09-03T01:53:14","timestamp":"2024-09-03T01:53:33Z","connection_id":"993","status":1156,"user":"","priv_user":"","os_login":"","proxy_user":"","host":"juju-da2225-8","ip":"10.207.85.214","db":""}}
{"audit_record":{"name":"Connect","record":"8_2024-09-03T01:53:14","timestamp":"2024-09-03T01:53:33Z","connection_id":"994","status":0,"user":"serverconfig","priv_user":"serverconfig","os_login":"","proxy_user":"","host":"juju-da2225-8","ip":"10.207.85.214","db":""}}

The logs are stored in the /var/snap/charmed-mysql/common/var/log/mysql directory, and it’s rotated every minute to the /var/snap/charmed-mysql/common/var/log/mysql/archive_audit directory. It’s recommended to integrate the charm with COS, from where the logs can be easily persisted and queried using Loki/Grafana.

Configurations

  1. plugin-audit-enabled - The audit plugin is enabled by default in the charm, but it’s possible to disable it by setting:

    juju config mysql plugin-audit-enabled=false

    Valid value are false and true. By setting it to false, existing logs are still kept in the archive_audit directory.

  2. plugin-audit-strategy - By default the audit plugin writes logs in asynchronous mode for better performance. To ensure logs are written to disk on more timely fashion, this configuration can be set to semi-synchronous mode:

    juju config mysql plugin-audit-strategy=semi-async

    Valid values are async and semi-async.