Keep vsftpd xferlog for a Full Year (logrotate)

For an ISMS audit finding we had to keep xferlog for one year. Here is what we applied.

I assumed /etc/vsftpd/vsftpd.conf would control it, but it did not. Edit /etc/logrotate.d/vsftpd and add monthly plus rotate 12 so logs under /var/log/xferlog/ accumulate for a year.

• yearly: once a year
• monthly: once a month
• weekly: once a week
• daily: once a day