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Important

Make sure that Elasticsearch nodes are not accessible externally; only the Swarm nodes and Gateway servers should be able to access Elasticsearch.

  1. Install RHEL/CentOS 7 or RHEL/Rocky Linux 8 and apply any required updates. Contact DataCore Support for questions about enabling or disabling IPv6.

Tip

Best Practice

Use RHEL/CentOS/Rocky Linux minimal server with compatibility libraries which is standard for Swarm development and testing. RHEL/CentOS desktop consumes extra resources that Elasticsearch uses and alters the OS configuration to emphasize user interface vs server performance. It also requires additional updating and security maintenance.

  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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