Before you begin installing Cloudera Data Science Workbench, make sure you have
      completed the steps to secure your hosts, set up DNS subdomains, and configure block
      devices.
      note
You should configure your system journal so that the message file does
         not grow unchecked. For example, the following sets the maximum size of
            
/var/log/message  to 500MB and older log files will be kept until
         the sum of all message files' sizes exceed
         4GB.
cat /etc/systemd/journald.conf |grep System
SystemMaxUse=4G
SystemMaxFileSize=500MFor information on performing these prerequisite tasks, see: Required Pre-Installation Steps 
      note
 For proof-of-concept deployments, you can deploy a 1-host cluster with just a Master
         host. The Master host can run user workloads just as a worker host can when required for
         demonstration purposes. For production deployments, you must have a reserved, dedicated
         master host and separate worker host(s).