What is the method to ensure the consistency of Erlang cookies in RabbitMQ?

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The method to ensure the consistency of Erlang cookies in RabbitMQ is by defining the cookie in the rabbitmq-env.conf file, which is a configuration file that is used to set environment variables for RabbitMQ. The cookie is defined as a string of alphanumeric characters that is shared by all the nodes in the RabbitMQ cluster. To ensure consistency, the cookie must be the same on all nodes in the cluster. Additionally, the Erlang runtime system also has a cookie that must match the RabbitMQ cookie. This can be set using the ERLANG_COOKIE environment variable. By ensuring consistency of the Erlang cookie, RabbitMQ nodes can communicate with each other and maintain the integrity of the RabbitMQ cluster.