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# RabbitMQ Peer Discovery Etcd
This is an etcd-based implementation of RabbitMQ [peer discovery interface](http://www.rabbitmq.com/blog/2018/02/12/peer-discovery-subsystem-in-rabbitmq-3-7/)
(new in 3.7.0, previously available in the [rabbitmq-autocluster plugin](https://github.com/rabbitmq/rabbitmq-autocluster)
by Gavin Roy).
This plugin only performs peer discovery and most basic node health monitoring
using [etcd](https://coreos.com/etcd/) as a data source.
Please get familiar with [RabbitMQ clustering fundamentals](https://rabbitmq.com/clustering.html) before attempting
to use it.
While it may seem at times that this is a RabbitMQ cluster management solution,
it is not. Cluster provisioning and most of Day 2 operations such as [proper monitoring](https://rabbitmq.com/monitoring.html)
are not in scope for this plugin.
## Supported RabbitMQ Versions
This plugin requires RabbitMQ 3.7.0 or later.
## Supported etcd Versions
The plugin supports etcd 3.4 or later and uses the current stable v3 gRPC API.
## Installation
This plugin ships with [supported RabbitMQ versions](https://www.rabbitmq.com/versions.html).
There is no need to install it separately.
As with any [plugin](https://rabbitmq.com/plugins.html), it must be enabled before it
can be used. For peer discovery plugins it means they must be [enabled](https://rabbitmq.com//plugins.html#basics) or [preconfigured](https://rabbitmq.com//plugins.html#enabled-plugins-file)
before first node boot:
```
rabbitmq-plugins --offline enable rabbitmq_peer_discovery_etcd
```
## Documentation
See [RabbitMQ Cluster Formation guide](https://www.rabbitmq.com/cluster-formation.html).
## Contributing
See [CONTRIBUTING.md](./CONTRIBUTING.md) and our [development process overview](http://www.rabbitmq.com/github.html).
## License
[Licensed under the MPL](LICENSE-MPL-RabbitMQ), same as RabbitMQ server.
## Copyright
(c) 2007-2024 Broadcom. The term “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. All rights reserved.
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