/etc/hosts will be empty if set hostname in create_container

My Env

• docker python

docker-py==1.7.0
Python 2.7.8
Client:
 Version:      1.10.1
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   9e83765
 Built:        Thu Feb 11 19:18:46 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.10.1
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   9e83765
 Built:        Thu Feb 11 19:18:46 2016
 OS/Arch:      linux/amd64

• OS: CentOS Linux release 7.1.1503 (Core), 3.10.0-229.el7.x86_64 GNU/Linux

My code

create_container params:

data = {
       'image': docker_image,
       'command': None,
       'hostname': 'xxxxxxx',
       'host_config': host_config,
       ......
}

host_conf = {
            'oom_kill_disable': False,
            'privileged': False,
            'network_mode': 'none',
            'ulimits': set_limits(), # my code for limits
            'dns': ['8.8.8.8', '8.8.4.4'],
            'extra_hosts': {'xxxxxxx': '127.0.1.1'},
            'mem_limit': '32M',
            'memswap_limit': '32M',
            'read_only': False
    }

###  and I create container use 

host_config = client.create_host_config(**host_conf)
client.create_container(**data)

#### Then start it, but exit, and docker logs show below.

Outputs

sudo: unable to resolve host xxxxxxx
sudo: unable to resolve host xxxxxxx
sudo: unable to resolve host xxxxxxx
sudo: unable to resolve host xxxxxxx

[root@centos tests]# docker exec 85493efa3b65 wc -l /etc/hosts
0 /etc/hosts

and container EXIT

• extra_hosts set but not useful

Start with the create_container and create_host_config entry points using hostname, network_mode='none', and extra_hosts, then reproduce the report on the stated Docker and Python versions. Inspect the resulting container's /etc/hosts and exit behavior; done means the hostname and extra_hosts entries are handled as intended instead of leaving /etc/hosts empty.