Purging the binary logs
With the provided configuration (expire_logs_days=1 in the MariaDB settings), the system will automatically remove the binary logs that are older than one day, even if the logs were not copied by the slave. This prevents the disk of the master node from being filled up in case the slave is down for a long time. The automatic binary log removal takes place when
- the master DB node starts,
- the logs are flushed (nevisProxy does not use this feature),
- the binary log rotates, or
- the binary logs are purged manually (see below).
So binary logs older than one day can exist, if none of the listed actions occurred recently.
Complemental to this expiration feature, MariaDB provides the possibility to manually purge the binary logs. The purge action removes all binary logs that were already copied by the slave. This allows a safe removal of the binary logs on a regular basis. The proxy package is delivered with an adaptable purging script, which is located at: /opt/nevisproxy/sql/mariadb/purgebinarylogs.sh
To use this script,
- copy the script to a location of your choice, and
- adapt it to your configuration.
The script takes care of both DB nodes, so that it only needs to be configured once. You can schedule the script to run for example once per hour, with a cron job:
/etc/crontab
0 **** /var/opt/nevisproxy/confluence/conf/purgebinarylogs.sh # Absolute path of your adapted script