# Helm Chart / Kubernetes

**URL:** <https://forum.opensearch.org/t/helm-chart-kubernetes/6795>\
**Category:** OpenSearch\
**Created:** [August 15, 2021, 9:59pm UTC](https://forum.opensearch.org/t/helm-chart-kubernetes/6795 "2021-08-15T21:59:00Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jamesdhope](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jamesdhope](https://forum.opensearch.org/u/jamesdhope)\
**Post date:** [August 15, 2021, 9:59pm UTC](https://forum.opensearch.org/t/helm-chart-kubernetes/6795/1 "2021-08-15T21:59:00Z")

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Hi All,

Great work on the Helm Chart: [https://github.com/opensearch-project/opensearch-devops/tree/main/Helm](https://github.com/opensearch-project/opensearch-devops/tree/main/Helm)

Can anyone tell me if the chart can be adapted to run with a single core? We have a need to run opensearch with a single core in staging and then causal cluster (3 core) in production.

Any advice appreciated.

James

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**Author:** ![TheAlgo](https://avatars.discourse-cdn.com/v4/letter/t/a88e57/32.png) [@TheAlgo](https://forum.opensearch.org/u/TheAlgo)\
**Post date:** [August 19, 2021, 7:25pm UTC](https://forum.opensearch.org/t/helm-chart-kubernetes/6795/2 "2021-08-19T19:25:26Z")

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> Can anyone tell me if the chart can be adapted to run with a single core? We have a need to run opensearch with a single core in staging and then causal cluster (3 core) in production.

By single core do you mean a single node cluster with one node being the master as well as data? if yes then yes you can run it on staging and 3 nodes on production(with any permutation of roles).

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**Author:** ![jamesdhope](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jamesdhope](https://forum.opensearch.org/u/jamesdhope)\
**Post date:** [August 20, 2021, 8:10am UTC](https://forum.opensearch.org/t/helm-chart-kubernetes/6795/3 "2021-08-20T08:10:36Z")

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Hi there Dhiraj

What would be the helm setting for one core please?

When i change number of cores to 1 the pod goes into a CrashLoop - am I missing another setting?

Thanks,  
James

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**Author:** ![TheAlgo](https://avatars.discourse-cdn.com/v4/letter/t/a88e57/32.png) [@TheAlgo](https://forum.opensearch.org/u/TheAlgo)\
**Post date:** [August 20, 2021, 9:28am UTC](https://forum.opensearch.org/t/helm-chart-kubernetes/6795/4 "2021-08-20T09:28:54Z")

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Hi James,

You need to change the `replicas` to 1 for a single core cluster. By the way there can be n number of reasons for facing this issues which can be not related to the Helm chart. It will be great if you try checking why is this happening by describing the pods. Also just wanted to know if you are facing same issues with 3 node cluster or not?  
Thanks

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**Author:** ![jamesdhope](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jamesdhope](https://forum.opensearch.org/u/jamesdhope)\
**Post date:** [August 21, 2021, 12:46pm UTC](https://forum.opensearch.org/t/helm-chart-kubernetes/6795/5 "2021-08-21T12:46:54Z")

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Hi there Dhiraj

Thank you for your reply.

It turns out that our node has insufficient memory (RAM).

Is there anyway we can adapt the helm chart so that opensearch claims less memory?

James