Would reduce unnecessary disk space from log files in your system if you use LogRotate. On this post-configure MongoDB log files, site MongoDB 3.0 you can change the behaviour logRotate parameter for MongoDB. If you use copy truncate works pretty well for log rotation.

First you have to update in mongoDB configure file /etc/mongod.conf.



systemLog:

  logAppend: true

  logRotate: reopen

Then, you can use this logrotate configuration: /etc/logrotate.d/mongodb



/var/log/mongodb*.log {

    daily

    rotate 30

    size 50M

    compress

    dateext

    missingok

    notifempty

    sharedscripts

    postrotate

        /bin/kill -SIGUSR1 `cat /var/lib/mongodb/mongod.lock 2> /dev/null` 2> /dev/null || true

    endscript

}


Use below command, If you would check immediately whether above config file is working good.

# logrotate -f ​/etc/logrotate.d/mongodb