How to install Grafana, InfluxDB and Telegraf on Ubuntu 20.04 LTS

Adding and Installing the InfluxDB and Telegraf Repositories

### Installing required packages
apt install curl gnupg gnupg1 gnupg2 net-tools software-properties-common

sudo curl -sL https://repos.influxdata.com/influxdb.key | sudo apt-key add -

source /etc/lsb-release
echo "deb https://repos.influxdata.com/${DISTRIB_ID,,} ${DISTRIB_CODENAME} stable" | sudo tee /etc/apt/sources.list.d/influxdb.list

sudo apt update
sudo apt install influxdb -y

sudo systemctl start influxdb
sudo systemctl enable influxdb

netstat -plntu | grep '8088\|8086'

Create the Database and its USER

### Create User and Database to store the Data from Telegraf Agent.
influx

create database telegraf
create user telegraf with password 'myP@ssw0rd'

show databases
show users

Telegraf: Installation and the configurations

### Install Telegraf Agent
sudo apt install telegraf -y

sudo systemctl start telegraf
sudo systemctl enable telegraf

sudo systemctl status telegraf

### Configure Telegraf
In this step, we will configure the Telegraf to use basic input plugins for 
collecting system metric of the server and using the influxdb as the output plugin.

cd /etc/telegraf/telegraf.d/

touch my_config_telegraf.conf
nano my_config_telegraf.conf

Config File: my_config_telegraf.conf

# Global Agent Configuration
[agent]
  hostname = "Grafana"
  flush_interval = "10s"
  interval = "10s"


# Input Plugins
[[inputs.cpu]]
    percpu = true
    totalcpu = true
    collect_cpu_time = false
    report_active = false
[[inputs.disk]]
    ignore_fs = ["tmpfs", "devtmpfs", "devfs"]
[[inputs.io]]
[[inputs.mem]]
[[inputs.net]]
[[inputs.system]]
[[inputs.swap]]
[[inputs.netstat]]
[[inputs.processes]]
[[inputs.kernel]]

# Output Plugin InfluxDB
[[outputs.influxdb]]
  database = "telegraf"
  urls = [ "http://127.0.0.1:8086" ]
  username = "telegraf"
  password = "myP@ssw0rd"
  
#Telegraf provides telegraf command to manage the configuration, 
#including generate the configuration itself, run the command as below.

Generate configurations

telegraf config -input-filter cpu:mem:disk:swap:system:net:netstat -output-filter influxdb > my_config_telegraf.conf
cat my_config_telegraf.conf

Grafana: Instalation

#Install Grafana
wget -q -O - https://packages.grafana.com/gpg.key | apt-key add -

add-apt-repository "deb https://packages.grafana.com/oss/deb stable main"

apt-get update -y
apt-get install grafana -y

systemctl daemon-reload
systemctl enable --now grafana-server
systemctl start grafana-server
systemctl status grafana-server

Login to grafana and add the InfluxDB as Data source

## Login to grafana
http://192.168.178.37:3000
Username: admin
Password: admin

##
add data source (influxDB)
  urls = [ "http://127.0.0.1:8086" ]
  database = "telegraf"
  username = "telegraf"
  password = "myP@ssw0rd"
  Type = GET

Import the Dashboard

## adding the Dashboard
Now open the sample Grafana dashboard from URL 
'https://grafana.com/dashboards/5955' 
and click the 'Copy the ID to Clipboard' button.

Paste in Grafana to import the Telegraf - System Metrics Dashboard