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PyYANG docker image

This repo contains the dockerfile to build an image with the PyYANG tool installed inside.

How to build/install

Pull the hellt/pyang image from the docker hub with docker pull hellt/pyang.

To locally build the image clone the repo and use docker build -t <your_repo>/<project>:<tag> . command.


hellt/pyang image expects you to mount a directory with YANG models (aka working directory) by the path /yang/. The following example demonstrates how to use the tools that are part of the PyYANG project with this configuration in mind:

# pyang tool example

# navigate to a dir with the YANG model(s) and run the container
# assuming the nokia-conf-combined.yang model is in the current directory
## create a tree representation of a yang model
docker run --rm -v $(pwd):/yang hellt/pyang pyang -f tree nokia-conf-combined.yang

Along with pyang, the following tools are part of the image:

  • json2xml
  • pyang
  • yang2dsdl
  • yang2html

Additional enhancements

XML skeleton wrapper

To simplify the process of getting the XML skeleton for the data modelled in YANG and referenced by its model path the wrapper has been created. The sole purpose of this wrapper is to remove the prefix from the path string, since pyang's XML_SKELETON does not digest them.

With wrapper the workflow of getting the XML skeleton boils down to the following steps:

  1. Take a YANG module's M.yang jstree (HTML) representation and get the node path (P) from the column named Path. To make an example: /state:state/state:users/state:session/state:session-id;
  2. run the wrapper with the both the node path and the YANG module referenced as follows:
    # using the node path and the model from step 1
    docker run --rm -v $(pwd):/yang hellt/pyang "/state:state/state:users/state:session/state:session-id" nokia-state-combined.yang
  3. As a result, you will be presented with an XML skeleton that you can use in your subtree filters.

Under the hood, the following command is executed inside the container:

pyang -f sample-xml-skeleton --sample-xml-skeleton-path "/state/users/session/session-id" nokia-state-combined.yang


The image is tagged with accordance to the PyYANG releases. The tag 2.1 means that PyYANG of version 2.1 is installed in the image. The untagged image will always represent the latest pyang version that was available at the time of the build process.

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