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