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How to Install Prometeus and Node-Exporter (on Ubuntu 18)
2020-02-27
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Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. This recipe describes how to install prometheus and node exporter (a famous metrics collector/exporter for hardware and OS metrics exposed by *NIX kernels) on Ubuntu systems with systemd.

Create a user

useradd -m -s /bin/bash prometheus
passwd prometheus

Install Prometheus

su - prometheus
wget https://github.com/prometheus/prometheus/releases/download/v2.16.0/prometheus-2.16.0.linux-amd64.tar.gz

tar -xf prometheus-2.16.0.linux-amd64.tar.gz
mv prometheus-2.16.0.linux-amd64/ prometheus/

mkdir -p ~/prometheus/data


wget https://github.com/prometheus/node_exporter/releases/download/v0.18.1/node_exporter-0.18.1.linux-amd64.tar.gz
mv node_exporter-0.18.1.linux-amd64 node_exporter

Configure prometheus to scrape the node_exporter metrics

vim prometheus/prometheus.yml

and insert

- job_name: 'node_exporter'
    static_configs:
    - targets: ['localhost:9100']

in section scrape_config

exit

Configure prometheus and node_exporter to startup via systemd

vim /etc/systemd/system/prometheus.service

Insert:

[Unit]
Description=Prometheus Server
Documentation=https://prometheus.io/docs/introduction/overview/
After=network-online.target

[Service]
User=prometheus
Restart=on-failure

#Change this line if you download the 
#Prometheus on different path user
ExecStart=/home/prometheus/prometheus/prometheus \
  --config.file=/home/prometheus/prometheus/prometheus.yml \
  --storage.tsdb.path=/home/prometheus/prometheus/data

[Install]
WantedBy=multi-user.target

vim /etc/systemd/system/node_exporter.service

Insert:

[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=prometheus
ExecStart=/home/prometheus/node_exporter/node_exporter

[Install]
WantedBy=default.target

Start them and enable auto start on system startup:

systemctl daemon-reload

systemctl start prometheus
systemctl enable prometheus

systemctl start node_exporter
systemctl enable node_exporter

Tests systemd config:

systemctl status prometheus
systemctl status node_exporter

Browse to localhost:9090 to see the servers metrics.

References: