title: How to change log level for MongoDB logs?
body: <p>Is there any way to change the default log level for MongoDB ?</p>
  
  <p>There're too many insertion/update entries in the log file, causing it grow way too big.</p>
  
  <p><strong>command used to start mongo:</strong></p>
  
  <pre><code>./bin/mongod --fork --bind_ip 0.0.0.0 --dbpath /data/db/ --logpath /data/log/mongodb/mongod.log --logappend --quiet --logRotate reopen
  </code></pre>
  
  <p><strong>the log file is filled with:</strong></p>
  
  <pre><code>2018-08-31T11:30:46.831+0800 I COMMAND  [conn564] command eques.$cmd command: insert 
  </code></pre>
  
  <p>I just need error or more severe level entries.</p>