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If passwordless ssh has not yet been set up within the cluster, then in main node generate key:

# cat /dev/zero | ssh-keygen -q -N "" 2>/dev/null
# cd ~/.ssh
# cat id_rsa.pub >> authorized_keys

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• If you're not installing on a single node, add this newly generated key to all the slave nodes:

  Code Block
  # ssh-copy-id -i ~/.ssh/id_rsa.pub <REPLACE_WITH_NODE_IP>

  Side note: You might have to adapt your sshd_config file and add "PermitRootLogin yes" amongst other parameters if you want passwordless root access, but that's outside the scope of this document.
  
  

• Increase limits for ElasticSearch and Storm on nodes where you will be installing them (if you don't know, increase it everywhere):

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