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arangodb/Documentation/DocuBlocks/clusterPassword.md

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@brief password used for cluster-internal communication --cluster.password password

The password used for authorization of cluster-internal requests. This password will be used to authenticate all requests and responses in cluster-internal communication, i.e. requests exchanged between coordinators and individual database servers.

This option is used for cluster-internal requests only. Regular requests to coordinators are authenticated normally using the data in the _users collection.

If coordinators and database servers are run with authentication turned off, (e.g. by setting the --server.authentication option to false), the cluster-internal communication will also be unauthenticated.