docker-py/docs/tmpfs.md

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:

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:

client.create_container(
    'busybox', 'ls',
    host_config=client.create_host_config(tmpfs={
        '/mnt/vol2': '',
        '/mnt/vol1': 'size=3G,uid=1000'
    })
)