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Docker libnetwork driver for OpenStack Neutron

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Docker for OpenStack Neutron

Kuryr-libnetwork is Kuryr’s Docker libnetwork driver that uses Neutron to provide networking services. It provides containerised images for the common Neutron plugins.

This repo provides libnetwork specific functionalities such as handler methods for libnetwork apis. All the logic/utilities that can be shared among different container networking frameworks such as Docker’s libnetwork, K8s’s CNI and so on, is maintained in separate Kuryr repo as a common library.


  • Docker libnetwork remote driver

  • Docker libnetwork IPAM driver

  • Support for Linux Bridge, Open vSwitch, Midonet, and IOvisor port bindings

  • Support for using existing Neutron networks:

    docker network create -d kuryr --ipam-driver=kuryr --subnet= --gateway= \
       -o mynet
    docker network create -d kuryr --ipam-driver=kuryr --subnet= --gateway= \
       -o mynet
  • Support for using existing Neutron ports:

    docker run -it --net=kuryr_net --ip= ubuntu
    if a port in the corresponding subnet with the requested ip address
    already exists and it is unbound, that port is used for the
  • Support for the Docker “expose” option:

    docker run --net=my_kuryr_net --expose=1234-1238/udp -it ubuntu
    This feature is implemented by using Neutron security groups.

Getting it running with a service container


The necessary components for an operating environment to run Kuryr are:

  • Keystone (preferably configured with Keystone v3),

  • Neutron (preferably mitaka or newer),

  • DB management system such as MySQL or Mariadb (for Neutron and Keystone),

  • Neutron agents for the vendor you choose,

  • Rabbitmq if the Neutron agents for your vendor require it,

  • Docker 1.9+

Building the container

The Dockerfile in the root of this repository can be used to generate a wsgi Kuryr Libnetwork server container with docker build:

docker build -t your_docker_username/libnetwork:latest .

Additionally, you can pull the upstream container:

docker pull kuryr/libnetwork:latest

Note that you can also specify the tag of a stable release for the above command instead of latest.

How to run the container

First we prepare Docker to find the driver:

sudo mkdir -p /usr/lib/docker/plugins/kuryr
sudo curl -o /usr/lib/docker/plugins/kuryr/kuryr.spec \
sudo service docker restart

Then we start the container:

docker run --name kuryr-libnetwork \
  --net=host \
  --cap-add=NET_ADMIN \
  -e SERVICE_USER=admin \
  -e USER_DOMAIN_NAME=Default \
  -v /var/log/kuryr:/var/log/kuryr \
  -v /var/run/openvswitch:/var/run/openvswitch \



  • IDENTITY_URL is the url to the OpenStack Keystone v3 endpoint

  • A volume is created so that the logs are available on the host

  • NET_ADMIN capabilities are given in order to perform network operations on the host namespace like ovs-vsctl

Other options you can set as ‘-e’ parameters in Docker run:

  • CAPABILITY_SCOPE can be “local” or “global”, the latter being for when there is a cluster store plugged into the docker engine.

  • LOG_LEVEL for defining, for example, “DEBUG” logging messages.

  • PROCESSES for defining how many kuryr processes to use to handle the libnetwork requests.

Note that you will probably have to change the IDENTITY_URL address for the address where your Keystone is running. In this case it is because the example assumes running the container with –net=host on an all in one deployment where Keystone is also binding locally.

Alternatively, if you have an existing kuryr.conf, you can use it for the container:

docker run --name kuryr-libnetwork \
  --net host \
  --cap-add NET_ADMIN \
  -v /etc/kuryr:/etc/kuryr:ro \
  -v /var/log/kuryr:/var/log/kuryr:rw \
  -v /var/run/openvswitch:/var/run/openvswitch:rw \

Getting it from source

$ git clone
$ cd kuryr-libnetwork

Install prerequisites

$ sudo pip3 install -r requirements.txt

Installing Kuryr’s libnetwork driver

Running the following will grab the requirements and install kuryr:

$ sudo pip3 install .

Configuring Kuryr

Generate sample config, etc/kuryr.conf.sample, running the following:

$ ./tools/

Rename and copy config file at required path:

$ cp etc/kuryr.conf.sample /etc/kuryr/kuryr.conf

For using Keystone v3, edit the Neutron section in /etc/kuryr/kuryr.conf, replace ADMIN_PASSWORD:

auth_url =
username = admin
user_domain_name = Default
project_name = service
project_domain_name = Default
auth_type = password

Alternatively, for using Keystone v2, edit the Neutron section in /etc/kuryr/kuryr.conf, replace ADMIN_PASSWORD:

auth_url =
username = admin
project_name = service
auth_type = password

In the same file uncomment the bindir parameter with the path for the Kuryr vif binding executables. For example, if you installed it on Debian or Ubuntu:

bindir = /usr/local/libexec/kuryr

Running Kuryr

Currently, Kuryr utilizes a bash script to start the service. Make sure that you have installed tox before the execution of the following commands:

If SSL needs to be enabled follow this step or skip to next step:

$tox -egenconfig

Add these 3 parameters in generated file[etc/kuryr.conf.sample]:
    ssl_cert_file <Absolute Path for Cert file>
    ssl_key_file <Absolute Path for private key>
    enable_ssl <True or False>

$export SSL_ENABLED=True

Add the path names in [contrib/tls/kuryr.json]:
    InsecureSkipVerify <false/true>
    CAFile: <Absolute Path for CA file>
    CertFile: <Absolute Path for Cert file>
    KeyFile: <Absolute Path for private key>

Placement of cert files:
By default Kuryr places it certs in /var/lib/kuryr/certs directory,
Please make sure that certs are on proper location as mentioned in kuryr.conf

Verification of kuryr.json:
Please make sure that your kuryr.json look similar to below sample
with appropiate paths of certs updated, and remove older .spec files
if any exists.
and https configuration url::
      "Name": "kuryr",
      "Addr": "",
      "TLSConfig": {
        "InsecureSkipVerify": false,
        "CAFile": "/var/lib/kuryr/certs/ca.pem",
        "CertFile": "/var/lib/kuryr/certs/cert.pem",
        "KeyFile": "/var/lib/kuryr/certs/key.pem"

For locally generating and testing, please refer to below link:

Run Kuryr Server with the command below. If you have uwsgi installed this command would run Kuryr under it. You can override this behaviour by setting KURYR_USE_UWSGI=False:

$ sudo ./scripts/

After Kuryr starts, please restart your Docker service, e.g.:

$ sudo service docker restart

The bash script creates the following file if it is missing:

  • /usr/lib/docker/plugins/kuryr/kuryr.json: Json spec file for libnetwork.

Note the root privilege is required for creating and deleting the veth pairs with pyroute2 to run.

kuryr-libnetwork docker managed pluginv2

How to build kuryr-libnetwork docker managed pluginv2

Docker Engine’s plugins system allows you to install, start, stop, and remove plugins using Docker Engine for docker 1.13 and older.

Download kuryr-libnetwork source code, and run contrib/docker/v2plugin/ in the top folder of kuryr-libentwork. This script will copy config.json to the top folder and build rootfs.

$ git clone
$ cd kuryr-libnetwork
$ ./contrib/docker/v2plugin/
$ docker plugin create kuryr/libnetwork2 ./

How to use kuryr-libnetwork docker managed pluginv2

If user build pluginv2 locally, user need to enable pluginv2.

$ docker plugin enable kuryr/libnetwork2

If user install pluginv2 from docker hub, the pluginv2 will be enabled directly after install.

$ docker plugin install kuryr/libnetwork2

When user create kuryr network, driver name and ipam-driver name are kuryr/libnetwork2:latest

$ docker network create --driver=kuryr/libnetwork2:latest --ipam-driver=kuryr/libnetwork2:latest ...

How to try out nested-containers locally

  1. Installing OpenStack running devstack with the desired local.conf file but including the next to make use of OVS-firewall and enabling Trunk Ports:

  2. Launch a VM with Neutron trunk port. <>

  3. Inside the VM install kuryr and kuryr-libnetwork following the normal installation steps (see above steps at Installing Kuryr’s libnetwork driver).

  4. Reconfigure kuryr inside the VM to point to the neutron server and to use the vlan driver:

    • Configure /etc/kuryr/kuryr.conf:

      driver = kuryr.lib.binding.drivers.vlan
      link_iface = eth0 # VM vNIC
      auth_url = http://KEYSTONE_SERVER_IP:5000/v3/
      username = admin
      user_domain_name = Default
      password = ADMIN_PASSWORD
      project_name = service
      project_domain_name = Default
      auth_type = password
    • Restart kuryr service inside the VM

Known nested-containers limitations

  1. Due to the Neutron Trunk service implementation choice deployments with iptables hybrid security groups driver do not support trunk service.

  2. QoS rules are not applied properly on sub-ports due to a Neutron bug, i.e. nested-container port.

Testing Kuryr

For a quick check that Kuryr is working, create a IPv4 network:

$ docker network create --driver kuryr --ipam-driver kuryr \
--subnet --gateway= test_v4_net
$ docker network ls
NETWORK ID          NAME                   DRIVER           SCOPE
785f8c1b5ae4        test_v4_net            kuryr            local

Or you can test with a dual-stack network:

$ docker network create --driver kuryr --ipam-driver kuryr \
--subnet --gateway= --ipv6 --subnet 2001:db8:a0b:12f0::/64 \
--gateway 2001:db8:a0b:12f0::1 test_net
$ docker network ls
NETWORK ID          NAME                DRIVER              SCOPE
81e1a12eedfb        test_net            kuryr               local

Known IPv6 network limitations

Due to the Docker –ipv6 tag bug version 1.12 and 1.13 have problem to create network only with IPv6.

Generating Documentation

We use Sphinx to maintain the documentation. You can install Sphinx using pip:

$ pip3 install -U Sphinx

In addition to Sphinx you will also need the following requirements (not covered by requirements.txt):

$ pip3 install openstackdocstheme reno 'reno[sphinx]'

The source code of the documentation are under doc, you can generate the html files using the following command. If the generation succeeds,a build/html dir will be created under doc:

$ cd doc
$ make html

Now you can serve the documentation at http://localhost:8080 as a simple website:

$ cd build/html
$ python3 -m SimpleHTTPServer 8080


Docker 1.12 with SwarmKit (the new Swarm) does not support remote drivers. Therefore, it cannot be used with Kuryr. This limitation is to be removed in Docker 1.13.

To create Docker networks with subnets having same/overlapping cidr, it is expected to pre-create Neutron subnetpool and pass the pool name for each such network creation Docker command. Docker cli options -o and –ipam-opt should be used to pass pool names as shown below:

$ neutron subnetpool-create --pool-prefix neutron_pool1
$ sudo docker network create --driver=kuryr --ipam-driver=kuryr \
  --subnet --gateway= --ip-range \
  -o \ \

Now Docker user creates another network with same cidr as the previous one, i.e, but with different pool name, neutron_pool2:

$ neutron subnetpool-create --pool-prefix neutron_pool2
$ sudo docker network create --driver=kuryr --ipam-driver=kuryr \
  --subnet --gateway= --ip-range \
  -o \ \

Alternatively, Docker user can pass an existing pool uuid if there are multiple pools with the same name:

$ sudo sudo docker network create --driver=kuryr --ipam-driver=kuryr \
  --subnet --gateway= --ip-range \
  -o neutron.pool.uuid=2d5767a4-6c96-4522-ab1d-a06d7adc9e23 \
  --ipam-opt=neutron.pool.uuid=2d5767a4-6c96-4522-ab1d-a06d7adc9e23 \

External Resources

The latest and most in-depth documentation is available at:


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