Logrotate

Logrotate utility

Man page: http://manpages.ubuntu.com/manpages/precise/man5/rsyslog.conf.5.html

The man page sucks.

How to use

Basic usage: https://www.tecmint.com/install-logrotate-to-manage-log-rotation-in-linux/

Create files in /etc/logrotate.d/ that correspond to various log files. The content of these files is a configuration file that look a bit like nginx...

For example, suppose we wanted to rotate logs for Apache, which stores its logs in the folder /var/log/apache2/*.

Then we can create a file at /etc/logrotate.d/apache.conf to hold the Apache logrotate options:

/var/log/apache2/* {
    weekly
    rotate 3
    size 10M
    compress
    delaycompress
}

Logrotate Logstash Elasticsearch

A much better guide from digital ocean is here: https://www.digitalocean.com/community/tutorials/how-to-centralize-logs-with-rsyslog-logstash-and-elasticsearch-on-ubuntu-14-04

this incorporates logstash and elasticsearch. :)

Log rotation in Ubuntu

Log rotation in ubuntu 16.04 is daily by default, with 7 days of backups kept.

Ref: https://askubuntu.com/a/124959

To change this, edit /etc/logrotate.d/rsyslog