Logrotate is a tool that is built into Debian which is really what Vyatta is built on. Logrotate is a tool that allows automatic rotation, compression, removal, and mailing of log files. Each log file may be handled daily, weekly, monthly, or when it grows too large. Recently I had an issue where all the space on my Vyatta was filled up, after some investigation it was the auth.log that had reached a couple hundred mb. After clearing it I was fine. After more investigation I found that auth.log was never in the logrotate config.
Below is an example. In this example if the size of the log file gets above 50m it will copy itself (by rotating), compress the copy and then start logging to the new auth.log. In another 50m it will rotate back. So at most I would have 100m of auth.log.
/var/log/auth.log {
size 50M
rotate 2
create
compress
}
I would just edit the /etc/logrotate.conf file and add this in.
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