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After installing and enable (rc-update) conntrack-tools-1.4.6 a /var/log/conntrackd-stats.log is created which is enabled by the default the conntracd config for stats. This never rotates, on a system running kubernetes kubelet for example the log grows huge and fills up the file system.

Solution: Add a logrotate script and/or disabled stats logging by default

Disable stats logging:

In /etc/conntrackd/conntrackd.conf

Stats {
       -----
       LogFile on -> #LogFile on
       -----
       }

Logrotate example:

/etc/logrotate.d/contrackd

/var/log/conntrackd*.log {
	missingok
	size 5M
	rotate 3
	compress
	copytruncate
}