xOpera TOSCA orchestrator

xOpera orchestration tool compliant with TOSCA YAML v1.3 in the making.

Aspect	Information
Tool name	opera
Documentation	opera CLI documentation
Orchestration standard	OASIS TOSCA Simple Profile in YAML v1.3
Implementation tools	Ansible

Table of Contents

• Introduction
• Prerequisites
• Installation and Quickstart
• Acknowledgement

Introduction

opera aims to be a lightweight orchestrator compliant with OASIS TOSCA. The current compliance is with the OASIS TOSCA Simple Profile in YAML v1.3. The opera CLI documentation for is available on GitHub pages. Opera implements TOSCA standard with Ansible automation tool where Ansible playbooks can be used as orchestration actuators within the TOSCA interface operations.

Prerequisites

opera requires Python 3 and a virtual environment. In a typical modern Linux environment, we should already be set. In Ubuntu, however, we might need to run the following commands:

$ sudo apt update
$ sudo apt install -y python3-venv python3-wheel python-wheel-common

Installation and Quickstart

The orchestration tool is available on PyPI as a package named opera. Apart from the latest PyPI production version, you can also find the latest opera PyPI development version, which includes pre-releases so that you will be able to test the latest features before they are officially released.

The simplest way to test opera is to install it into Python virtual environment:

$ mkdir ~/opera && cd ~/opera
$ python3 -m venv .venv && . .venv/bin/activate
(.venv) $ pip install opera

To test if everything is working as expected, we can now clone xOpera's GitHub repository and try to deploy a hello-world service:

(.venv) $ git clone git@github.com:xlab-si/xopera-opera.git
(.venv) $ cd xopera-opera/examples/hello
(.venv) $ opera deploy service.yaml
[Worker_0]   Deploying my-workstation_0
[Worker_0]   Deployment of my-workstation_0 complete
[Worker_0]   Deploying hello_0
[Worker_0]     Executing create on hello_0
[Worker_0]   Deployment of hello_0 complete

If nothing went wrong, new empty file has been created at /tmp/playing-opera/hello/hello.txt.

To delete the created directory, we can undeploy our stuff by running:

(.venv) $ opera undeploy
[Worker_0]   Undeploying hello_0
[Worker_0]     Executing delete on hello_0
[Worker_0]   Undeployment of hello_0 complete
[Worker_0]   Undeploying my-workstation_0
[Worker_0]   Undeployment of my-workstation_0 complete

And that is it. For more startup examples please visit examples folder, or go to xopera-examples repository if you wish to explore deeper with more complex xOpera examples. If you want to use opera commands from an API take a look at xopera-api repository. To find more about xOpera project visit our xOpera documentation.

Acknowledgement

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreements No. 825040 (RADON) and No. 825480 (SODALITE).