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Allow the initialization of configserver replicasets for sharded clusters #708

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Allow the initialization of configserver replicasets for sharded clusters #708

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rolatsch
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SUMMARY

To allow the initialization of configserver replicasets for sharded clusters i've added the configsrv parameter to the replicaset_add function.

Relevant docs:
https://www.mongodb.com/docs/manual/tutorial/deploy-shard-cluster/#initiate-the-replica-set
https://www.mongodb.com/docs/manual/reference/replica-configuration/#mongodb-rsconf-rsconf.configsvr

COMPONENT NAME

mongodb_replicaset module

@rhysmeister
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Hello @rolatsch,

If memory serves correctly somehow mentioned this a whle back... the thing is the module already works for config server replicasets. See here...

https://github.com/ansible-collections/community.mongodb/blob/master/tests/integration/targets/mongodb_shard/tasks/main.yml

What's the consequence of not doing this?

Rhys

@rolatsch
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rolatsch commented Sep 1, 2025

Hello @rhysmeister,
thank you for looking into this.
Actually i'm not sure about this. The mongodb docs say that you should add configsvr: true to the document you pass to rs.initiate.
Only piece of intel i found on this, is this google group from 2016.

Roland

@rolatsch
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rolatsch commented Sep 8, 2025

Did some testing on this an could not spot a difference between ReplicaSets that were initialized with this parameter and ones that were initialized without 🤷‍♂️

@rhysmeister
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I would guess that it automatically adds this flag if the host was started with the --configsrv flag. I'm not really sure why it's there tbh.

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@rolatsch @rhysmeister