**Please note that support questions will not be monitored during the summer period of July and August. **

NOTICE: For this version, the solution provider made every effort to provide a stable and functional release. No thorough testing was conducted due to the absence of a Cygnus Linked Data ready version. There is warranty, expressed or implied, as to the reliability and stability of the solution. The support team remains available to help on any issue that can be encountered and any feedback is thoroughly appreciated.

CEF Context Broker Linked Data integration with the Big Data Test Infrastructure.

This Integration Solution connects a Orion CB-LD with a Cygnus, allowing the user to easily configure the storing of the context data in BDTIs file system (HDFS). The application:

• Manages CBs subscriptions to Cygnus (create and delete)
• Sets how and where the context data will be stored
• Automatically deploys Cygnus each time a change done in its configuration is done

All this information is provided by a configuration file that establishes the parametrics to do so.

CBLD-BDTI core component (cbld_bdti/) is a command line interface application (CLI) that offers the commands and options needed to work with the integration.

The following instructions will allow you to get a completely functional CBLD-BDTI environment. This is just a guideline about how to install and deploy the solution. Adapt it to your needs.

CBLD-BDTI has some requirements that should be accomplished before starting deploying it.

• Ubuntu 18.04.1 LTS 64-bit or later
• Python 3.6 or later
• pip3 9.0.1 or later

Update packages list in case you didn't do before (recommended):

sudo apt update

Python 3 is already installed in Ubuntu 18 distributions. However, in case you want to use Python 3.7, follow the next steps to install it.

First update packages list and install the prerequisites:

sudo apt install software-properties-common

Then add the deadsnakes PPA to your sources list:

sudo add-apt-repository ppa:deadsnakes/ppa

Last, install Python 3.7 with:

sudo apt install python3.7

You can verify if everything is alright just typing (it should print Python version number):

$ python3.7 --version
Python 3.7.3

pip3 will be used as the package manager for Python. It will be used for CB-EDP installation, so must be installed before starting the deployment.

After packages list update, install pip for Python 3:

sudo apt install python3-pip

You can verify the installation typing:

$ pip3 --version
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.7)

To install the Integration Solution, download this repository as a ZIP file and move it to the machine where you want to deploy it. Once you got it, install it using pip:

sudo pip3 install /path/to/cb_bdti.zip

It should have installed too every dependency (Click, configobj and paramiko) of the CBLD-BDTI. In case it didn't or you aren't sure of it, install them directly using requirements.txt file. First unzip it cause it's on downloaded ZIP file:

unzip /path/to/cbld_bdti.zip
pip3 install -r /path/to/requirements.txt

You can check it's installed launching show pip3 command:

$ pip3 show cbld-bdti
---
Metadata-Version: 1.0
Name: cbld-bdti
Version: 0.1
Summary: FIWARE Context Broker Linked Data instance integration with the BDTI
Home-page: https://github.com/ConnectingEurope/Context-Broker-BDTI-LD
Location: /usr/local/lib/python3.7/dist-packages
Requires: Click, configobj, paramiko, requests
Classifiers:
Entry-points:
  [console_scripts]
  cbld-bdti=cbld_bdti.commands:cli

Connecting to BDTI could be difficult because of its security measures. You will need to make a tunnel between Cygnus server and BDTI HDFS in order to allow Cygnus to persist context data. In the following steps this process will be explained just as a tutorial or guidelines that can help you to get a working communication between these applications. Adapt it to your needs.

First of all:

• You will need a key file to HDFS server. This should be provided by BDTI team and it will be used to made the tunnel possible.

• Copy hostname of every Data Nodes on the cluster. You can do this executing:

  sudo -uhdfs hdfs dfsadmin -report
  

Now you need to install autossh in Cygnus machine. Update packages list in case you didn't do before and install it:

sudo apt-get update
sudo apt-get install autossh

Once it's installed, create the tunnel for Name Node from Cygnus machine replacing the values:

• {bastion_private_key} for the path of Bastion machine private key
• {namenode_port} for the NameNode WebUI port (50070 by default)
• {hostname_namenode} for the hostname of Name Node cluster
• {bastion_username} for the username of Bastion machine
• {bastion_host} for the host of Bastion machine

autossh -i {bastion_private_key} -N -L {namenode_port}:{hostname_namenode}:{namenode_port} {bastion_username}@{bastion_host}

Then, create the tunnels for the Data Nodes from Cygnus machine executing the command for each Data Node you have and replacing the values:

• {bastion_private_key} for the path of Bastion machine private key
• {namenode_port} for the NameNode WebUI port (50070 by default)
• {hostname_namenode} for the hostname of Name Node cluster
• {bastion_username} for the username of Bastion machine
• {bastion_host} for the host of Bastion machine

autossh -i {bastion_private_key} -N –L {datanode_port}:{hostname_datanode}:{datanode_port} {bastion_username}@{bastion_host}

At last, add for each Data Node the next line in {/etc/hosts} file in Cygnus machine replacing:

• {host_datanode} for the hostname of each Data Node of the cluster

127.0.0.1 {host_datanode} localhost

You can test WebHDFS connection doing a curl to localhost on 50070 port for Name Node (by default) or 50075 port for Data Node (by default).

• Python 3.7

This project is licensed under the European Union Public License 1.2 -see the LICENSE file for details.

The Context Broker - Big Data Test Infrastructure enabler (NGSI-LD) has been carried out by:

• CEF Digital
• everis
• FIWARE