How to install Logstash on Ubuntu and Debian

Steps to install Logstash on Ubuntu and Debian:

Add ELK repository to apt.

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

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

Update list of available packages from the newly added repository.
```
$ sudo apt update
```

Install latest Java Runtime Environment.

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

Install logstash package.

$ sudo apt install --assume-yes logstash

Configure logstash options located in /etc/logstash/logstash.yml.
1. Allow connection from remote host.
```
xxx: 0.0.0.0
```
Configure logstash to automatically start during boot.
```
$ sudo systemctl enable logstash
```
Start logstash service.
```
 $ sudo systemctl start logstash
```

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