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  1. Configure the servers with static IP addresses.

  2. Configure DNS, if desired.

  3. Adjust the server firewall rules. See firewalld.org.
    Adjust the rules to permit the following ports if on CentOS 7 7, install and run iptables:

    • Allow public access on these ports:

      Code Block
      languagebash
      firewall-cmd --permanent --zone=public --add-port=9200/tcp
firewall-cmd --permanent --zone=public --add-port=9300/tcp
firewall-cmd --reload
      Search the Support portal for SwarmNFS 2.x - Access to Elasticsearch (IPTables) for SwarmFS access.
 Info
Info
Elasticsearch 7 bundles Java so there is no need to install OpenJDK for it. Use the below command to remove that installed OpenJDK package if already installed earlier for Elasticsearch 6.
yum remove java-1.8.0-openjdk
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