# /etc/logrotate.d/mongod.conf

/var/log/mongodb/mongod.log {
  daily
  size 2M
  rotate 30
  missingok
  compress
  delaycompress
  notifempty
  create 640 mongodb mongodb
  sharedscripts
  postrotate
    /bin/kill -SIGUSR1 `pidof mongod` >/dev/null 2>&1
  endscript
}