Bringing Up an OpenSearch Node

If one of the nodes in an existing cluster is down, use these steps to bring it up:

1. If you are running on Linux, set these environment variables:

   • Verify that the heap size is set to a value equal to or less than 50% of available memory, and not exceeding 30G.

     See "Preparing to Deploy," Reviewing OpenSearch Recommendations.

   • Set the JAVA_HOME environment variable, where yy is the JDK version.

     export JAVA_HOME= BASE_DIR/pt/os_jdk21.0.yy
     

2. Start the OpenSearch node.

   See Starting and Stopping an OpenSearch Service.