2. Parser YANG2TOSCA

2.1. Overview

Parser is an open source project and licensed under Apache 2. Parser will help to provide a tooling mechanism, by parsing Telecom operators’ VNF descriptors (YANG templates) into TOSCA templates and then further translate TOSCA templates into certain common templates, which could be used in IaaS orchestration projects like OpenStack Heat.

2.2. Prerequisites

Parser requires the following to be installed.

2.2.1. 1. PYANG

Please follow the below installation steps.

Step 1: Clone pyang tool or download the zip file from the following link.

git clone https://github.com/mbj4668/pyang.git


wget https://github.com/mbj4668/pyang/archive/master.zip

Step 2: Change directory to the downloaded directory and run the setup file.

cd pyang
python setup.py

2.2.2. 2. python-lxml

Please follow the below installation link. http://lxml.de/installation.html

2.3. Installation

Please follow the below installation steps to install parser.

Step 1: Clone the parser project.

git clone https://gerrit.opnfv.org/gerrit/parser

2.4. Execution

Step 1: Change directory to where the scripts are present.

cd parser/yang2tosca
Step 2: Copy the YANG file which needs to be converted into TOSCA to
current (parser/yang2tosca) folder.

Step 3: Run the python script “parser.py” with the YANG file as an input option.

python parser.py -n "YANG filename"


python parser.py -n example.yaml
Step 4: Verify the TOSCA YAMl which file has been created with the same name
as the YANG file with a “_tosca” suffix.
cat "YANG filename_tosca.yaml"


cat example_tosca.yaml