Rotate mongo logs every week

mongod

# /etc/logrotate.d/mongod
# http://linuxcommand.org/man_pages/logrotate8.html
/var/log/mongodb/mongodb.log {
    weekly
    missingok
    rotate 30
    compress
    dateext
    notifempty
    sharedscripts
    postrotate
        /bin/kill -SIGUSR1 `cat /var/lib/mongodb/mongod.lock 2> /dev/null` 2> /dev/null || true
    endscript
}