Set Up Log Rotation

When logging to a file, FeatureBase components will re-open the log file on receipt of the HUP signal. This allows for seamless log rotation. As an example, to configure log rotation with FeatureBase:

1. First create a log directory owned by the system user that runs the FeatureBase process; we recommend /var/log/molecula.

2. Next, configure FeatureBase to write to a file in that new directory. Edit your featurebase.conf and add log-path = "/var/log/molecula/featurebase.log".

3. Restart FeatureBase for the new logging configuration to take effect.

4. Ensure that logrotate is installed and configured to run daily with cron. This should be the default after installation on most Linux systems. Check /etc/cron.daily/logrotate to make sure.

5. Add a new logrotate configuration file at /etc/logrotate.d/featurebase with the following contents:

/var/log/molecula/featurebase.log {
    missingok
    notifempty
    rotate 7
    daily
    compress
    postrotate
        pkill -HUP featurebase
    endscript
}

1. Repeat steps 2-5 for the Ingesters, replacing references to FeatureBase where appropriate.

Note that pkill -HUP featurebase may not be reliable and that you should use kill -HUP $(cat /path/to/pidfile) if you are using a PID file.