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An NSO Nano service as a CI/CD pipeline

Nano services are a great feature to help you build a solid CI/CD pipeline with no or low code on top of Cisco NSO orchestration platform. Defined in YANG format, Nano services can be easily extended with small Python modules for specific tasks. This example service, named nano, demonstrates a pipeline with manual work approval, pre and post-testing, SLA tracking, Webex notifications, XML and Python template-based device configurations.

For a description of a use case and a typical workflow, please check USECASE.md.

Provided code and configurations are intended for educational purposes only.

How to run this example

This repo represents a folder where you should instantiate a local NSO CDB with the ncs-setup command. Combining with NSO Local Install, it will create an environment to run and develop the example.

You need to complete a few steps:

  1. Install NSO in Local Install mode
  2. Clone the repo
  3. Create a Python virtual environment and install all dependencies
  4. Configure environment variables
  5. Compile packages and start NSO

The service is tested against NSO 5.5.2.6 for macOS (Intel), NEDs: cisco-ios-cli-3.8, Python 3.9.5.

Install NSO

You need to have an NSO installed in Local Install mode to run this example with mostly no modifications. For detailed instructions on how to get a copy of NSO and do a local install, please check DevNet documentation and NSO Installation Guide.

After a successful installation, please make sure you source the ncsrc file from a local install folder, for example:

$ source /Users/username/nso/5.5.2.6/ncsrc

$ ncs --version
5.5.2.6

$ echo $PYTHONPATH
/Users/username/nso/5.5.2.6/src/ncs/pyapi

$ echo $NCS_DIR
/Users/username/nso/5.5.2.6

/Users/username/nso/5.5.2.6/ is a NSO local install folder.

Clone the repo

git clone https://githib.com/andreygrechin/nano
cd nano

Create a Python virtual environment and install all dependencies

Check a version of Python; we need at least 3.9.

$ python3 --version
Python 3.9.5

To install dependencies, run:

$ python3 -m venv .venv

$ source .venv/bin/activate

$ which python3
/Users/username/repos/nso/nano/.venv/bin/python3

$ pip3 install -r requirements.txt

For linting and other development activities, you may add additional requirements from requirements-dev.txt.

To check if NSO Python API is available, try this:

python3 -c "import ncs"

Configure environment variables

The example uses Webex API to send notifications to an approver and report Service Progress Monitoring (aka SLA of service instances) status. You can find instructions on creating a Webex bot and getting all the required credentials here.

You need to add obtained credentials via environment variables. Alternatively, you may specify them as a part of a configuration of the service.

export WEBEX_BOT_TOKEN="YOUR-WEBEX-BOT-TOKEN-HERE"
export WEBEX_ROOM_ID="YOUR-WEBEX-ROOM-ID-HERE"

To check credentials, run:

curl --location --request POST 'https://api.ciscospark.com/v1/messages' \
--header 'Content-Type: application/json' \
--header "Authorization: Bearer ${WEBEX_BOT_TOKEN}" \
--data-raw '{
  "roomId" : "'"${WEBEX_ROOM_ID}"'",
  "text" : "my test msg"
}'

Compile packages and start NSO

make or make all will clean up underlying folders, compile YANG models, set up required simulated devices, create an empty local NSO CDB, create local NSO files in the repo folder, load configuration files, and start NSO.

To run CLI or WebUI, use make cli or make webui. A default password for the user admin is admin.

After entering CLI, check if all packages are successfully loaded.

admin@ncs# show packages package oper-status
                                                                                                      PACKAGE
                        PROGRAM                                                                       META     FILE
                        CODE     JAVA           PYTHON         BAD NCS  PACKAGE  PACKAGE  CIRCULAR    DATA     LOAD   ERROR
NAME                UP  ERROR    UNINITIALIZED  UNINITIALIZED  VERSION  NAME     VERSION  DEPENDENCY  ERROR    ERROR  INFO
-----------------------------------------------------------------------------------------------------------------------------
cisco-ios-cli-3.8   X   -        -              -              -        -        -        -           -        -      -
example-nano-0.1.0  X   -        -              -              -        -        -        -           -        -      -

admin@ncs#

For a description of a use case and a typical workflow, please check USECASE.md.

Clean up

After finishing your session, you may stop the NSO process and clean up folders with make clean or just make stop to stop NSO.

Testing the NSO service

To optionally run lux tests, you need to install it with all dependencies. Check the documentation for details.

An example of a lux script is included in the repo. It's pretty simple, but it does the job. Check it here. You may run it from scratch with the make all nsotest command.

Getting help

If you have questions, concerns, bug reports, etc., please create an issue against this repository.

Getting involved

For contribution guidelines, please check CONTRIBUTING.md.

References

  1. NetDevOps intro from Julio Gomez, based on NSO, Ansible and GitLab CI/CD pipelines.
  2. Nano Services – Another approach for Reactive Fastmap (RFM) services, demo.
  3. Building a Service, from Template to Reactive Fast Map to Nano services.