How to install Logstash on Ubuntu and Debian

Steps to install Logstash on Ubuntu and Debian:

1. Add ELK repository to apt.
   1. Add GPG key of ELK's repository via apt-key.

      $ wget --quiet --output-document=- https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
      [sudo] password for user:
      OK

   2. Add ELK's repository to apt's repository list.

      $ echo "deb https://artifacts.elastic.co/packages/6.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-6.x.list
      deb https://artifacts.elastic.co/packages/6.x/apt stable main

2. Update list of available packages from the newly added repository.

   $ sudo apt update

3. Install latest Java Runtime Environment.

   $ sudo apt install --assume-yes openjdk-11-jre

4. Install logstash package.

   $ sudo apt install --assume-yes logstash

5. Configure logstash options located in /etc/logstash/logstash.yml.
   1. Allow connection from remote host.

      xxx: 0.0.0.0

6. Configure logstash to automatically start during boot.

   $ sudo systemctl enable logstash

7. Start logstash service.

    $ sudo systemctl start logstash