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arangodb/Documentation/DocuBlocks/clusterUsername.md

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@brief username used for cluster-internal communication
`--cluster.username username`
The username used for authorization of cluster-internal requests.
This username 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.