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rabbitmq/README.md
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@ -228,7 +228,9 @@ Example `enabled_plugins`
If additional configuration is required, it is recommended to supply an appropriate `/etc/rabbitmq/rabbitmq.conf` file (see [the "Configuration File(s)" section of the RabbitMQ documentation for more details](https://www.rabbitmq.com/configure.html#configuration-files)), for example via bind-mount, [Docker Configs](https://docs.docker.com/engine/swarm/configs/), or a short `Dockerfile` with a `COPY` instruction.
Alternatively, it is possible to use the `RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS` environment variable, whose syntax is described [in section 7.8 ("Configuring an Application") of the Erlang OTP Design Principles User's Guide](http://erlang.org/doc/design_principles/applications.html#id81887) (the appropriate value for `-ApplName` is `-rabbit`), but this method is much harder to get right than the configuration file format suggested above. For example, configuring [`log_levels`](https://www.rabbitmq.com/configure.html#config-items) would look something like `-e RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="-rabbit log_levels [{connection,error}]"`. Additional configuration keys would be specified as a list. For example, configuring both [`log_levels`](https://www.rabbitmq.com/configure.html#config-items) and [`auth_backends`](https://www.rabbitmq.com/ldap.html#overview) would look something like `-e RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="-rabbit log_levels [{connection,error}] auth_backends [rabbit_auth_backend_ldap]"`.
Alternatively, it is possible to use the `RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS` environment variable, whose syntax is described [in section 7.8 ("Configuring an Application") of the Erlang OTP Design Principles User's Guide](http://erlang.org/doc/design_principles/applications.html#id81887) (the appropriate value for `-ApplName` is `-rabbit`), this method requires a slightly different reproduction of its equivalent entry in `rabbitmq.conf`. For example, configuring [`channel_max`](https://www.rabbitmq.com/configure.html#config-items) would look something like `-e RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="-rabbit channel_max 4007"`. Where the space between the variable `channel_max` and its value `4007` correctly becomes a comma when translated in the environment.
Additional configuration keys would be specified as a list. For example, configuring both [`channel_max`](https://www.rabbitmq.com/configure.html#config-items) and [`auth_backends`](https://www.rabbitmq.com/ldap.html#overview) would look something like `-e RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="-rabbit channel_max 4007 auth_backends [rabbit_auth_backend_ldap,rabbit_auth_backend_internal]"`. Note that some variables such as for `auth_backends` require their value(s) to be enclosed in brackets, and for multiple values explicitly including the comma as a delimiter.
## Connecting to the daemon