opensearch-docs-cn/_opensearch/install/important-settings.md

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default	Important settings	Install OpenSearch	70

Important settings

For production workloads, make sure the Linux setting vm.max_map_count is set to at least 262144. Even if you use the Docker image, set this value on the host machine. To check the current value, run this command:

cat /proc/sys/vm/max_map_count

To increase the value, add the following line to /etc/sysctl.conf:

vm.max_map_count=262144

Then run sudo sysctl -p to reload.

The sample docker-compose.yml file also contains several key settings:

• bootstrap.memory_lock=true

  Disables swapping (along with memlock). Swapping can dramatically decrease performance and stability, so you should ensure it is disabled on production clusters.

• OPENSEARCH_JAVA_OPTS=-Xms512m -Xmx512m

  Sets the size of the Java heap (we recommend half of system RAM).

• nofile 65536

  Sets a limit of 65536 open files for the OpenSearch user.

• port 9600

  Allows you to access Performance Analyzer on port 9600.

Do not declare the same JVM options in multiple locations because it can result in unexpected behavior or a failure of the OpenSearch service to start. If you declare JVM options using an environment variable, such as OPENSEARCH_JAVA_OPTS=-Xms3g -Xmx3g, then you should comment out any references to that JVM option in config/jvm.options. Conversely, if you define JVM options in config/jvm.options, then you should not define those JVM options using environment variables. {: .note}

Network requirements

The following ports need to be open for OpenSearch components.

Port number	OpenSearch component
443	OpenSearch Dashboards in AWS OpenSearch Service with encryption in transit (TLS)
5601	OpenSearch Dashboards
9200	OpenSearch REST API
9250	Cross-cluster search
9300	Node communication and transport
9600	Performance Analyzer