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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

• 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

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• <REPLACE_

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• WITH_

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• NODE_

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• 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):

# echo -e "elasticsearch - memlock unlimited\nstorm - nproc 257597" >> /etc/security/limits.conf

• Adjust limits to secure level ([link](https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.0/bk_installing_manually_book/content/ref-729d1fb0-6d1b-459f-a18a-b5eba4540ab5.1.html)):

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