OpsCenter_tarball_install_custom_start-stop_scripts.md

OpsCenter Tarball Installation Custom Start/Stop Scripts

Currently Customize scripts for starting and stopping DataStax Enterprise for OpsCenter tarball installation doesn’t provide any information for customers/users to properly leverage the scripts. Something like below would be helpful to get started with.

I would start modifying the start script something like below,

• https://docs.datastax.com/en/dse/6.8/dse-admin/datastax_enterprise/operations/startStop/startDseStandalone.html

  #!/bin/sh
  
  # modify startup with relevant flag, i.e. add -k for analytics, -s for search
  DSE_START="/path/to/tarball/installation/bin/dse cassandra"
  
  sudo $DSE_START
  # add some wait seconds?
  RESULT=$?
  if [ $RESULT -eq 0 ]
  then
      # startup successful
      exit $RESULT
  else
      # something went wrong starting DSE
      echo >&2 "ERROR - Failed to start DSE, error code [$RESULT]. Check system.log for details."
      exit $RESULT
  fi
  

I would start modifying the stop script something like below,

• https://docs.datastax.com/en/dse/6.8/dse-admin/datastax_enterprise/operations/startStop/stopDseNode.html

  #!/bin/sh
  NODETOOL=/path/to/nodetool
  DSE_STOP="/path/to/tarball/installation/bin/dse cassandra-stop"
  #One could go fancier like DSE_STOP=kill -9 `ps -ef|grep -v grep|grep cassandra|grep dse|cut -d" " -f4`
  
  sudo $NODETOOL drain
  #add wait for couple seconds?
  RESULT=$?
  if [ $RESULT -ne 0 ]
  then
      # something went wrong with drain
      echo >&2 "ERROR - nodetool drain failed with error code [$RESULT]... attempting to stop DSE..."
  fi
  
  sudo $DSE_STOP
  RESULT=$?
  if [ $RESULT -eq 0 ]
  then
      # shutdown successful
      exit $RESULT
  else
      # something went wrong stopping DSE
      echo >&2 "ERROR - Failed to stop DSE, error code [$RESULT]"
      exit $RESULT
  fi
  

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