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source/developers/multiple_instances.markdown

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+---
+layout: page
+title: "Multiple Instances"
+description: "Quick primer on how multiple instances work together."
+date: 2016-04-16 14:24 -07:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+Home Assistant supports running multiple synchronized instances using a master-slave model. Whenever `events.fire` or `states.set` is called on the salve it will forward it to the master. The master will replicate all events and changed states to its slaves.
+
+<p class='img'>
+  <a href='/images/architecture/architecture-remote.png'>
+    <img src='/images/architecture/architecture-remote.png' />
+  </a>
+  Overview of the Home Assistant architecture for multiple devices.
+</p>
+
+A slave instance can be started with the following code and has the same support for components as a master instance.
+
+```python
+import homeassistant.remote as remote
+import homeassistant.bootstrap as bootstrap
+
+# Location of the Master API: host, password, port.
+# Password and port are optional.
+remote_api = remote.API("127.0.0.1", "password", 8124)
+
+# Initialize slave
+hass = remote.HomeAssistant(remote_api)
+
+# To add an interface to the slave on localhost:8123
+bootstrap.setup_component(hass, 'frontend')
+
+hass.start()
+hass.block_till_stopped()
+```
+
+<p class='note'>
+Because each slave maintains its own Service Registry it is possible to have multiple slaves respond to one service call.
+</p>