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KILDA CONTROLLER

Build StatusQuality Gate

Introduction

Note that the build process will install additional packages. It is recommended that you build on a virtual machine.

Prerequisites

The followings are required for building Kilda controller:

  • Gradle 6.7+
  • Maven 3.3.9+
  • JDK8
  • Python 2.7+
  • Python 3.5+
  • Docker 19.03.3+
  • Docker Compose 1.20.0+
  • GNU Make 4.1+
  • Open vSwitch 2.9+

For running virtual environment you additionally need linux kernel 4.18+ for OVS meters support

On Ubuntu 18.04, you can install those dependencies like this:

apt-get install maven openjdk-8-jdk python python3 docker.io docker-compose virtualenv make openvswitch-switch linux-generic-hwe-18.04 python3-setuptools python3-pip

Gradle

You can either install Gradle, or use Gradle wrapper:

  • Option 1 - Install Gradle (ensure that you have gradle 6.7 or later) - https://gradle.org/install/

  • Option 2 - Use Gradle wrapper. The Kilda repository contains an instance of Gradle Wrapper which can be used straight from here without further installation.

Docker

Note that your build user needs to be a member of the docker group for the build to work. Do that by adding the user to /etc/groups and logging out and back in again.

Maven

You also need to increase the maven RAM limit at least up to 1G.

export MAVEN_OPTS="-Xmx1g -XX:MaxPermSize=128m"

Python

Ensure that you have Python2 installed since some of build steps depends on it. Possible option for that using virtual environment (virtualenv) with python interpreter version provided:

virtualenv --python=python2 .venv
. .venv/bin/activate

Ensure that you have tox installed:

pip install -U pip
pip install tox

Confd

Also, don't forget to install confd. This tool is used for creating config/properties files from templates. To install it execute the following command:

wget https://github.com/kelseyhightower/confd/releases/download/v0.16.0/confd-0.16.0-linux-amd64 -O /usr/local/bin/confd
chmod +x /usr/local/bin/confd

/etc/hosts

Following entry has to be added to /etc/hosts for local Kilda to work properly

127.0.0.1 localhost kafka.pendev logstash.pendev

How to build Kilda Controller

From the base directory run the following command:

make build-stable

Note that additional Ubuntu packages will be installed as part of the build process.

How to clean Kilda Controller

From the base directory run the following command:

make clean

How to run Kilda Controller

NB: To run Kilda, you should have built it already (ie the previous section). This is particularly important because docker-compose will expect some of the containers to already exist.

From the base directory run the following command:

make up-test-mode

How to create a virtual topology for test

make test-topology

How to run Kilda Controller in blue-green mode

Blue-green mode is an implementation of zero downtime feature. In this mode you run two versions of kilda: old one(blue) and new one(green). And switch blue to green at some moment.

First of all you need to build two sets of images.

To build blue version of Kilda you need to run:

make build-stable

To build green version of Kilda you need to run:

make build-latest

These two commands build images with tags stable and latest. These tags will be used to run kilda in blue mode (from stable images) or in green mode (for latest images).

There are 3 new commands to run kilda in blue-green mode:

Following command run Kilda in blue mode from stable images. Also it runs all common components like zookeeper, database, kafka, etc.

make up-stable

Next command run green version of Kilda from the latest images. Common components wouldn't be rerun (we started them by previous command). Also floodligth 1 wouldn't be rerun (only floodlight 2). Floodlight 1 will stay on blue mode.

make up-green

Next command is used to test rollbacks. It runs stable components in blue mode. The difference with make up-stable is that command wouldn't start common components (like zookeeper, kafka, etc) and floodlight 2 (it stays in green mode).

make up-blue

How to debug Kilda Controller components

An important aspect of troubleshooting errors and problems in your code is to avoid them in the first place. It's not always easy enough so we should have a reliable mechanism. Adding any diagnostic code may be helpful, but there are more convenient ways. Just a few configuration changes and you'll be able to use a debug toolkit. As a basis, let's take the northbound component. This is a simple REST application providing the interface for interaction with the switch, link, flow, feature, health-check controllers. The first thing that we need to do is to add

"-agentlib:jdwp=transport=dt_socket,address=50505,suspend=n,server=y"

to the CMD block in docker/northbound/Dockerfile, where 50505 is the port we’ll use for debugging. It can be any port, it’s up to us. The final file will be the following:

ARG base_image=kilda/base-ubuntu
FROM ${base_image}

ADD BUILD/northbound/libs/northbound.jar /app/
WORKDIR /app
CMD ["java", "-XX:+PrintFlagsFinal", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-agentlib:jdwp=transport=dt_socket,address=50505,suspend=n,server=y", "-jar", "northbound.jar"]

Since debugging is done over the network, that also means we need to expose that port in Docker. For that purpose we need to add "50505:50505" to the northbound ports block in docker-compose.yml as in example below.

northbound:
  container_name: openkilda-northbound
  build:
    context: docker
    dockerfile: northbound/Dockerfile
  ports:
    - '8088:8080'
    - '50505:50505'
  ...

After making those changes we need to configure remote debug in IntelliJ IDEA: navigate to Edit Configurations -> Remote and set up the debug port as 50505. This completes the main part of the configuration.

Next, we just run docker-compose up. If everything above was done correctly you must see:

"java -agentlib:jdwp=transport=dt_socket,address=50505,suspend=n,server=y -jar northbound.jar"

in the command column for the open-kilda_northbound. The command docker ps -a --no-trunc | grep northbound could be helpful. Also check open-kilda_northbound logs, the log record

Listening for transport dt_socket at address: 50505

must be presented.

After all these steps you just need to run the debugger. Console log should contain the following message:

Connected to the target VM, address: 'localhost:50505', transport: 'socket'

To check how debugging works we need to:

  • set up a breakpoint;
  • make a call to execute some functionality;

In some cases, we must have an approach for debugging a deploy process for a couple (or more) components that interact with each other. Let's suppose both of them work under docker and some component doesn't belong to us and provided as a library. The typical case: WorkflowManager (further WFM) and Storm. The approach that is going to be used is almost the same as for northbound but there are nuances. First of all, we need to check which version of Storm is used in Open Kilda Controller. For that open docker/storm/Dockerfile and find the version of Storm. In our case, the Storm version is 1.1.0. To be able to debug Storm we have to clone the sources from the GitHub repo https://github.com/apache/storm.git and switch to the release 1.1.0. git checkout -b 1.1.0 e40d213. Information about releases can be found here https://github.com/apache/storm/releases/

Then go to docker/wfm/Dockerfile and add ENV STORM_JAR_JVM_OPTS "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=50506" The final file should be as in example below:

ARG base_image=kilda/storm:latest
FROM ${base_image}

ENV STORM_JAR_JVM_OPTS "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=50506"
...

And it only remains to add a port 50506 for the WFM contaner as in the example below:

wfm:
  container_name: wfm
  build:
    context: docker
    dockerfile: wfm/Dockerfile
  ...
  ports:
    - "50506:50506"

Then we should configure remote debugging in IntelliJ IDEA and the set up the debug port as 50506. After executing docker-compose up you should see the following log record Listening for transport dt_socket at address: 50506 in the WFM logs. As soon as you see it run the debugger - you'll able to debug both components: WFM and Storm.

In order to debug a topology, for example, NetworkTopology: create (or open if already exists) NetworkTopology.main application debug configuration and add --local to Program arguments, execute docker-compose up and run in the debug mode NetworkTopology.main.

How to run tests

Please refer to the Testing section on our Wiki.

How to build / test locally without containers

Start with the following

make unit

From there, you can go to specific projects to build / develop / unit test. Just follow the make unit trail. Most projects have a gradle build or maven target.

How to build / test key use cases

Look in the docker/hacks/usecase directory and you'll find several makefiles that will assist with the development and testing of that use case.

As an example, you can execute the following command for more information on the network discovery use case:

make -f docker/hacks/usecase/network.disco.make help

or

cd docker/hacks/usecase
make -f network.disco.make help

How to use a VM to do development

VirtualBox and Vagrant are popular options for creating VMs. A VM may be your best bet for doing development with Kilda. There are a set of files in the source tree that will facilitate this.

  • NB1: Ensure you have VirtualBox and Vagrant installed and on the path
  • NB2: You'll re-clone kilda so that there aren't any write permission issues between the guest VM and the host.

Steps:

  1. From the root directory, look at the Vagrantfile; feel free to change its parameters.
  2. vagrant up - create the VM; it'll be running after this step.
  3. vagrant ssh - this will log you into the vm.
  4. ssh-keygen -t rsa -C "your_email@example.com" - you'll use this for GitHub. Press for each question; three in total.
  5. Add the ~/.ssh/id-rsa.pub key to your GitHub account so that you can clone kilda
cat ~/.ssh/id_rsa.pub
  1. Clone and Build
# NB: Instead of putting it in vm-dev, you can use /vagrant/vm-dev
#     This has the added benefit that the code will appear outside the VM
#     i.e. /vagrant is shared with the same directory as the Vagrantfile
git clone git@github.com:<your_github_account>/open-kilda.git vm-dev
cd vm-dev
git checkout mvp1rc
make build-base
docker-compose build
make unit
make up-test-mode

How to use confd for config/properties templating

Pre-requirements: you need confd version v0.14.0+ for processing yams/json as backend. You can download it from official confd site

We have confd for managing config/properties files from templates. Confd configs, templates and variable file stored in confd/ folder. confd/conf.d/*.toml - files with desctiption how to process templates (src. path, dst.path.... etc) confd/templates/*/*.tmpl - templates in go-template format confd/vars/main.yaml - file with all variables substituted in templates

How should I add new template

  1. create and place template file to confd/templates/ folder
  2. create and place template description in confd/conf.d/ filder
  3. change (if needed) vars in confd/main.yaml
  4. run: make update-props-dryrun for checking that templates can be processed
  5. run: make update-props for applying templates

Common use cases

An example, you already have orientdb server, and want to use it instead of dockerized orientdb. You can add orientdb endpoints to confd/vars/main.yaml and create properties template for services which use orientdb:

confd/conf.d/base-storm-topology.topologies.toml:

[template]
src = "base-storm-topology/topology.properties.tmpl"
dest = "src-java/base-topology/base-storm-topology/src/release/resources/topology.properties"
keys = [ "/" ]
mode = "0644"

confd/vars/main.yaml:

kilda_orientdb_hosts: "odb1.pendev,odb2.pendev,odb3.pendev"
kilda_orientdb_hosts_single: "odb1.pendev"
kilda_orientdb_user: "kilda"
kilda_orientdb_password: "kilda"

confd/templates/base-storm-topology/topology.properties.tmpl

...
{{if not (exists "/single_orientdb")}}
orientdb.url=remote:{{ getv "/kilda_orientdb_hosts" }}/{{ getv "/kilda_orientdb_database" }}
{{else}}
orientdb.url=remote:{{ getv "/kilda_orientdb_hosts_single" }}/{{ getv "/kilda_orientdb_database" }}
{{end}}
orientdb.user = {{ getv "/kilda_orientdb_user" }}
orientdb.password = {{ getv "/kilda_orientdb_password" }}
...

In this example we will generate file src-java/base-topology/base-storm-topology/src/release/resources/topology.properties from template confd/templates/base-storm-topology/topology.properties.tmpl

About

OpenKilda is an open-source OpenFlow controller initially designed for use in a global network with high control-plane latency and a heavy emphasis on latency-centric data path optimisation.

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