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Nornir NETCONF

codecov CI

Collection of NETCONF tasks and connection plugin for Nornir

Installation

pip install nornir_netconf

Plugins

Connections

  • netconf - Connect to network devices using ncclient

Tasks

  • netconf_capabilities - Return server capabilities from target -> Result.result -> RpcResult
  • netconf_commit - Commits a change -> Result.result -> RpcResult
  • netconf_edit_config - Edits configuration on specified datastore (default="running") -> Result.result -> RpcResult
  • netconf_get - Returns state data based on the supplied xpath -> Result.result -> RpcResult
  • netconf_get_config - Returns configuration from specified configuration store (default="running") -> Result.result -> RpcResult
  • netconf_get_schemas - Retrieves schemas and saves aggregates content into a directory with schema output -> Result.result -> SchemaResult
  • netconf_lock - Locks or Unlocks a specified datastore (default="lock") -> Result.result -> RpcResult
  • netconf_validate - Validates configuration datastore. Requires the validate capability. -> Result.result -> RpcResult

Response Result

The goal of the task results is to put the NETCONF RPC-reply back in your hands. In most cases, the Nornir Result.result attribute will return back a dataclass depending on the task operation. It's important that you understand the object you will be working with. Please see the dataclasses section below and review the code if you want to see what attributes to expect.

Dataclasses

Defined in nornir_netconf/plugins/helpers/models.py

  • RpcResult -> This will return an attribute of rpc and manager. You will encounter this object in most Nornir Results as the return value to the result attribute. NETCONF / XML payloads can be overwhelming, especially with large configurations and it's just not efficient or useful to display thousands of lines of code in any result.
  • SchemaResult -> An aggregation of interesting information when grabbing schemas from NETCONF servers.

Global Lock

The netconf_lock task will always return the Manager object, which is the established (and locked) agent used to send RPC's back and forth. The idea of retrieving the Manager is to carry this established locked session from task to task and only lock and unlock once during a run of tasks. Please review the examples below to see how to extract the manager and store it under the task.host dictionary as a variable that can be used across multiple tasks. The Manager is passed into other tasks and re-used to send RPCs to the remote server.

Examples

Head over to the Examples directory if you'd like to review the files.

Directory Structure 
├── example-project
│   ├── config.yml
│   ├── inventory
│   │   ├── groups.yml
│   │   ├── hosts-local.yml
│   │   └── ssh_config
│   ├── logs
│   │   └── nornir.log
│   └── nr-get-config.py
└── README.md
Netconf Connection Plugin

Below is the snippet of a host inside the host-local.yml file and its associated group, sros.

nokia_rtr:
  hostname: "192.168.1.205"
  port: 830
  groups:
    - "sros"
sros:
  username: "netconf"
  password: "NCadmin123"
  port: 830
  platform: "sros"
  connection_options:
    netconf:
      extras:
        hostkey_verify: false
        timeout: 300
        allow_agent: false
        look_for_keys: false
Task: Get Config 
    """Nornir NETCONF Example Task: 'get-config'."""
    from nornir import InitNornir
    from nornir.core.task import Task
    from nornir_utils.plugins.functions import print_result

    from nornir_netconf.plugins.tasks import netconf_get_config

    __author__ = "Hugo Tinoco"
    __email__ = "[email protected]"

    nr = InitNornir("config.yml")

    # Filter the hosts by 'west-region' assignment
    west_region = nr.filter(region="west-region")


    def example_netconf_get_config(task: Task) -> str:
        """Test get config."""
        config = task.run(
            netconf_get_config,
            source="running",
            path="""
            <configure xmlns="urn:nokia.com:sros:ns:yang:sr:conf">
                <router>
                    <router-name>Base</router-name>
                </router>
            </configure>
            """,
            filter_type="subtree",
        )
        return config.result.rpc.data_xml


    def main():
        """Execute Nornir Script."""
        print_result(west_region.run(task=example_netconf_get_config))


    if __name__ == "__main__":
        main()

This returns the following

    vvvv example_netconf_get_config ** changed : False vvvvvvvvvvvvvvvvvvvvvvvvvvvvv INFO
    <?xml version="1.0" encoding="UTF-8"?><rpc-reply xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="urn:uuid:918bf169-523f-4bb0-b00c-c97c01a48ecd">
        <data>
            <configure xmlns="urn:nokia.com:sros:ns:yang:sr:conf">
                <router>
                    <router-name>Base</router-name>
                    <interface>
                        <interface-name>L3-OAM-eNodeB069420-X1</interface-name>
                        <admin-state>disable</admin-state>
                        <ingress-stats>false</ingress-stats>
                    </interface>
                </router>
            </configure>
        </data>
    </rpc-reply>
    ---- netconf_get_config ** changed : False ------------------------------------- INFO
    RpcResult(rpc=<ncclient.xml_.NCElement object at 0x7f4b1e08a440>)
    ^^^^ END example_netconf_get_config ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    (nornir-netconf-Ky5gYI2O-py3.10) ➜  example-project git:(feature/validate-tasks) ✗
Task: Get Capabilities 
    """Nornir NETCONF Example Task: 'capabilities'."""
    from nornir import InitNornir
    from nornir.core.task import Task
    from nornir_utils.plugins.functions import print_result

    from nornir_netconf.plugins.tasks import netconf_capabilities

    __author__ = "Hugo Tinoco"
    __email__ = "[email protected]"

    nr = InitNornir("config.yml")

    # Filter the hosts by 'west-region' assignment
    west_region = nr.filter(region="west-region")


    def example_netconf_get_capabilities(task: Task) -> str:
        """Test get capabilities."""
        capabilities = task.run(netconf_capabilities)
        # This may be a lot, so for example we'll just print the first one
        return [cap for cap in capabilities.result.rpc][0]


    def main():
        """Execute Nornir Script."""
        print_result(west_region.run(task=example_netconf_get_capabilities))


    if __name__ == "__main__":
        main()

This returns the following

    (nornir-netconf-Ky5gYI2O-py3.10) ➜  example-project git:(feature/validate-tasks) ✗ python3 nr_get_capabilities.py 
    example_netconf_get_capabilities************************************************
    * nokia_rtr ** changed : False *************************************************
    vvvv example_netconf_get_capabilities ** changed : False vvvvvvvvvvvvvvvvvvvvvvv INFO
    urn:ietf:params:netconf:base:1.0
    ---- netconf_capabilities ** changed : False ----------------------------------- INFO
    RpcResult(rpc=<dict_keyiterator object at 0x7f7111328c70>)
    ^^^^ END example_netconf_get_capabilities ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    (nornir-netconf-Ky5gYI2O-py3.10) ➜  example-project git:(feature/validate-tasks) ✗
Task: Edit-Config with Global Lock 
    """Nornir NETCONF Example Task: 'edit-config', 'netconf_lock'."""
    from nornir import InitNornir
    from nornir_utils.plugins.functions import print_result
    from nornir_netconf.plugins.tasks import netconf_edit_config, netconf_lock, netconf_commit


    __author__ = "Hugo Tinoco"
    __email__ = "[email protected]"

    nr = InitNornir("config.yml")

    # Filter the hosts by 'west-region' assignment
    west_region = nr.filter(region="west-region")


    def example_global_lock(task):
        """Test global lock operation of 'candidate' datastore."""
        lock = task.run(netconf_lock, datastore="candidate", operation="lock")
        # Retrieve the Manager(agent) from lock operation and store for further
        # operations.
        task.host["manager"] = lock.result.manager


    def example_edit_config(task):
        """Test edit-config with global lock using manager agent."""

        config_payload = """
        <config>
            <configure xmlns="urn:nokia.com:sros:ns:yang:sr:conf">
                <router>
                    <router-name>Base</router-name>
                    <interface>
                        <interface-name>L3-OAM-eNodeB069420-X1</interface-name>
                        <admin-state>disable</admin-state>
                        <ingress-stats>false</ingress-stats>
                    </interface>
                </router>
            </configure>
        </config>
        """

        result = task.run(
            netconf_edit_config, config=config_payload, target="candidate", manager=task.host["manager"]
        )
        # Validate configuration
        task.run(netconf_validate)
        # Commit
        task.run(netconf_commit, manager=task.host["manager"])

    def example_unlock(task):
        """Unlock candidate datastore."""
        task.run(netconf_lock, datastore="candidate", operation="unlock", manager=task.host["manager"])


    def main():
        """Execute Nornir Script."""
        print_result(west_region.run(task=example_global_lock))
        print_result(west_region.run(task=example_edit_config))
        print_result(west_region.run(task=example_unlock))


    if __name__ == "__main__":
        main()
Task: Get Schemas 
    """Get Schemas from NETCONF device."""
    from nornir import InitNornir
    from nornir.core import Task
    from nornir.core.task import Result
    from nornir_utils.plugins.functions import print_result

    from nornir_netconf.plugins.tasks import netconf_get, netconf_get_schemas
    from tests.conftest import xml_dict

    __author__ = "Hugo Tinoco"
    __email__ = "[email protected]"

    nr = InitNornir("config.yml")


    # Filter the hosts by 'west-region' assignment
    west_region = nr.filter(region="west-region")

    SCHEMA_FILTER = """
    <netconf-state xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring">
        <schemas>
        </schemas>
    </netconf-state>
    """


    def example_task_get_schemas(task: Task) -> Result:
        """Get Schemas from NETCONF device."""
        result = task.run(netconf_get, path=SCHEMA_FILTER, filter_type="subtree")
        # xml_dict is a custom function to convert XML to Python dictionary. Not part of Nornir Plugin.
        # See the code example if you want to use it.
        parsed = xml_dict(result.result.rpc.data_xml)
        first_schema = parsed["rpc-reply"]["data"]["netconf-state"]["schemas"]["schema"][0]
        return task.run(netconf_get_schemas, schemas=[first_schema["identifier"]], schema_path="./output/schemas")


    def main():
        """Execute Nornir Script."""
        print_result(west_region.run(task=example_task_get_schemas))


    if __name__ == "__main__":
        main()

This returns the following

    (nornir-netconf-Ky5gYI2O-py3.10) ➜  example-project git:(feature/validate-tasks) ✗ python3 nr_get_schemas.py 
    example_task_get_schemas********************************************************
    * nokia_rtr ** changed : False *************************************************
    vvvv example_task_get_schemas ** changed : False vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv INFO
    ---- netconf_get ** changed : False -------------------------------------------- INFO
    RpcResult(rpc=<ncclient.xml_.NCElement object at 0x7f36391540d0>)
    ---- netconf_get_schemas ** changed : False ------------------------------------ INFO
    SchemaResult(directory='./output/schemas')
    ^^^^ END example_task_get_schemas ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Additional Documentation

Contributions

Github actions spins up a Containerlab instance to do full integration tests once linting has been satisfied.

No line of code shall go untested! Any contribution will need to be accounted for by the coverage report and satisfy all linting.

Linters:

  • Ruff (Flake8/Pydocstyle)
  • Black
  • Yamllint
  • Pylint
  • Bandit
  • MyPy

Testing

To test within a local docker environment

git clone https://github.com/h4ndzdatm0ld/nornir_netconf
docker-compose build && docker-compose run test

To test locally with pytest

If you'd like to run integration tests with ContainerLab

export SKIP_INTEGRATION_TESTS=False
docker-compose up -d
poetry install && poetry shell
pytest --cov=nornir_netconf --color=yes --disable-pytest-warnings -vvv

Integration Tests

Devices with full integration tests with ContainerLab

  • Nokia SROS - TiMOS-B-21.2.R1
  • Cisco IOSxR - Cisco IOS XR Software, Version 6.1.3
  • Cisco IOSXE - Cisco IOS XE Software, Version 17.03.02
  • Arista CEOS - 4.28.0F-26924507.4280F (engineering build)

Documentation

Documentation is generated with Sphinx and hosted with Github Pages. Documentation