41 lines
1.2 KiB
Markdown
41 lines
1.2 KiB
Markdown
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---
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layout: default
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title: Important settings
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parent: Install OpenSearch
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nav_order: 70
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---
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# Important settings
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For production workloads, make sure the [Linux setting](https://www.kernel.org/doc/Documentation/sysctl/vm.txt) `vm.max_map_count` is set to at least 262144. On the OpenSearch Docker image, this setting is the default. To check, start a Bash session in the container and run:
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```bash
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cat /proc/sys/vm/max_map_count
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```
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To increase this value, you have to modify the Docker image. For other install types, add this setting to the host machine's `/etc/sysctl.conf` file with the following line:
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```
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vm.max_map_count=262144
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```
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Then run `sudo sysctl -p` to reload.
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The [sample docker-compose.yml](../docker/#sample-docker-compose-file) file also contains several key settings:
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- `bootstrap.memory_lock=true`
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Disbles swapping (along with `memlock`). Swapping can dramatically decrease performance and stability, so you should ensure it is disabled on production clusters.
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- `OPENSEARCH_JAVA_OPTS=-Xms512m -Xmx512m`
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Sets the size of the Java heap (we recommend half of system RAM).
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- `nofile 65536`
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Sets a limit of 65536 open files for the OpenSearch user.
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- `port 9600`
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Allows you to access Performance Analyzer on port 9600.
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