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GUI Development Prerequisites

This document provides an overview of the tools and packages needed to work on and to build onos-gui. Developers are expected to have these tools installed on the machine where the project is built.

Reusing tools from an existing ONOS installation

If you already have the legacy ONOS project code checked out and built using Bazel on your system, then you already have all the tools you need. Add the following 2 entries to your $PATH environment variable to give access to the npm and the ng command respectively

  • [bazel output_base]/external/nodejs_linux_amd64/bin/nodejs/bin
  • ~/onos/web/gui2/node_modules/@angular/cli/bin

where [bazel output_base] above can be found from running the command:

bazel info output_base

After setting the PATH it should be possible to see the version of node and npm:

node -v
npm -v
which ng


If legacy ONOS is not available install the latest Long Term Support version of NodeJS on your system.

After installing it should be possible to see the version of node and npm (which is bundled with it) that you installed with:

node -v
npm -v

Angular CLI

If legacy ONOS is not available install Angular CLI to provide the ng tools. Installation instructions are at

The following command can be run from any folder:

npm install -g @angular/cli

Checkout the onos-gui code from Git

Using a process described the Git repo should be forked in your own name on

git clone$GIT_USER/onos-gui.git
# or: 
git clone$GIT_USER/onos-gui.git
cd $ONOS_ROOT/onos-gui
git remote add upstream
# or: git remote add upstream

# Never push to upstream master
git remote set-url --push upstream no_push

# Confirm that your remotes make sense:
git remote -v

Set up Angular for local development

After this install (and after changing to the web/onos-gui folder) it should be possible to see the Angular CLI version:

cd web/onos-gui
ng version

This should give a result like:

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|

Angular CLI: 8.3.20
Node: 10.16.0
OS: linux x64
Angular: 8.2.14
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Angular dependencies

Staying inside the web/onos-gui folder, the Angular dependencies must be installed. This is as simple as running npm install in the folder. This takes the dependencies listed in package.json and installs them in the temporary folder node_modules:

npm install


Docker is required to build the project Docker images and also to compile *.proto files into TypeScript source files.

Local kubernetes environment

Some form of local kubernetes development environment is also needed. The core team uses Kind, but there are other options such as Minikube and Microk8s for Ubuntu. The onit (ONOS Integration Test tool) should be used to set up the cluster, or deploy gives more details on a Helm installation.


Some form of an integrated development environment that supports Web Development with TypeScript is also recommended. The core team uses the Intellij WebStorm IDE from JetBrains, but there are many other options. The Atom editor is a lightweight solution supporting TypeScript and Git integration. Visual Studio Code is another option that supports TypeScript.


The project requires that all Typescript source files are properly annotated using the Apache 2.0 License. Since this requirement is enforced by the CI process, it is strongly recommended that developers setup their IDE to include the license text automatically.