How to install Graylog on Ubuntu 18.04.1 LTS ?

1.    Graylog2 is a powerful log management and analysis tool that has many use cases, from monitoring SSH logins and unusual activity to debugging applications. It is based on Elasticsearch, Java, MongoDB, and Scala.The installation is not exactly to say simple since a lot of integration goes behind involving different applications including Elasticsearch, Java, MongoDB, and Scala. But in few steps and little modifications in default configuration files,the same can be run with ease.

2.   Below are terminal commands with screen shots to achieve the same running

Firstly,the system that I m installing the GRAYLOG on ..the specs are as below

 Then coming to the root terminal...from where all the commands will be executed for installation.

$ apt update && apt upgrade

 Next we install the JDK module

$ apt install apt-transport-https uuid-runtime pwgen openjdk-8-jre-headless

 This is followed by installing ELASTICSEARCH

$ wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | apt-key add -

 $ echo "deb https://artifacts.elastic.co/packages/5.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-5.x.list

Next we install
 $ apt update && apt install elasticsearch

This is followed by enabling the service and starting

$   systemctl enable elasticsearch $   systemctl start elasticsearch

Amend cluster.name as graylog

 Followed by these lines at the EOF

script.inline: false

script.indexed: false

script.file: false

 

This is followed by

$ systemctl restart elasticsearch

 

Now install the key

$ apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2930ADAE8CAF5059EE73BB4B58712A2291FA4AD5 

 Then MANGODB repository

$ echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.6.list

 Install mongodb

$ apt update && apt install mongodb-org

$   systemctl start mongod

$    systemctl enable mongod

$ wget https://packages.graylog2.org/repo/packages/graylog-2.5-repository_latest.deb
$ dpkg -i graylog-2.5-repository_latest.deb
$ apt-get update
$ apt-get install graylog-server

After installation of the Graylog package is finished, we need to edit the configuration file to set our password in it and we do it using pwgen command 

$ pwgen -N 1 -s 96

 $ echo -n your_password | sha256sum

 

We place the above generated output in the conf file as seen below : 

Assistance reference from https://www.osradar.com/how-to-install-graylog-on-ubuntu-18-04/ - Thanks