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# Port bindings
Port bindings is done in two parts. Firstly, by providing a list of ports to
open inside the container in the `Client().create_container()` method.
```python
container_id = c.create_container('busybox', 'ls', ports=[1111, 2222])
```
Bindings are then declared in the `Client.start` method.
```python
c.start(container_id, port_bindings={1111: 4567, 2222: None})
```
You can limit the host address on which the port will be exposed like such:
```python
c.start(container_id, port_bindings={1111: ('127.0.0.1', 4567)})
```
Or without host port assignment:
```python
c.start(container_id, port_bindings={1111: ('127.0.0.1',)})
```
If you wish to use UDP instead of TCP (default), you need to declare it
like such in both the `create_container()` and `start()` calls:
```python
container_id = c.create_container(
'busybox',
'ls',
ports=[(1111, 'udp'), 2222]
)
c.start(container_id, port_bindings={'1111/udp': 4567, 2222: None})
```
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