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# Using tmpfs
When creating a container, you can specify paths to be mounted with tmpfs using
the `tmpfs` argument to `create_host_config`, similarly to the `--tmpfs`
argument to `docker run`.
This capability is supported in Docker Engine 1.10 and up.
`tmpfs` can be either a list or a dictionary. If it's a list, each item is a
string specifying the path and (optionally) any configuration for the mount:
```python
client.create_container(
'busybox', 'ls',
host_config=client.create_host_config(tmpfs=[
'/mnt/vol2',
'/mnt/vol1:size=3G,uid=1000'
])
)
```
Alternatively, if it's a dictionary, each key is a path and each value contains
the mount options:
```python
client.create_container(
'busybox', 'ls',
host_config=client.create_host_config(tmpfs={
'/mnt/vol2': '',
'/mnt/vol1': 'size=3G,uid=1000'
})
)
```
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