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Fluentd offers the capability to set up log rotation, particularly useful when managing large volumes of logs that consume significant disk space. This feature can be configured through Fluentd's system-wide settings.
Here is an example of a log rotation configuration in Fluentd that can rotate logs daily:
/etc/fluent/fluentd.conf
<system>
<log>
rotate_age 7
rotate_size 1048576
</log>
</system>
The configuration options are as follows:
rotate_age: This parameter specifies the maximum age of log files in days before they are rotated. In this example, logs older than seven days will be rotated.rotate_size: This option defines the maximum file size in bytes for a log file before it gets rotated. Here, the file size threshold for rotation is set at 1MB.
Additionally, the rotate_age option can accept string values for more dynamic scheduling:
/etc/fluent/fluentd.conf
<system>
<log>
rotate_age weekly
rotate_size 1048576
</log>
</system>
Setting rotate_age to "weekly" means that the files will be rotated every week.
These settings are not limited to configuration files. You can also pass them as command-line arguments:
fluentd -c fluent.conf --log-rotate-age 7 --log-rotate-size 104857600
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