Downloads, extracts, enables and starts node_exporter

node_exporter.service

[Unit]
Description=Node Exporter

[Service]
User=node_exporter
EnvironmentFile=/etc/sysconfig/node_exporter
ExecStart=/opt/node_exporter/node_exporter $OPTIONS

[Install]
WantedBy=multi-user.target

node_exporter_downloader.sh

#!/usr/bin/env bash

for command in jq wget curl; do
  if [[ -z $(type -P $command) ]]; then
    echo "$command is required for this script to work."
  fi
done

# Download latest node_exporter and extract to /opt
cd /tmp
VERSION=$(curl "https://api.github.com/repos/prometheus/node_exporter/tags" -s | jq -r '.[0].name')
wget https://github.com/prometheus/node_exporter/releases/download/$VERSION/node_exporter-${VERSION/v/}.linux-amd64.tar.gz
mkdir -p /opt/node_exporter
tar xvfz node_exporter-*.*-amd64.tar.gz -C /opt/node_exporter

# Download services for starting node exporter
wget -O /etc/systemd/system/node_exporter.service https://gist.githubusercontent.com/thraizz/0d1ff1fcec354f822478d5402078d7d7/raw/9c1a5d66346644fb6e59a59920b28691ca34e99a/node_exporter.service
mkdir /etc/sysconfig
wget -O /etc/sysconfig/node_exporter https://github.com/prometheus/node_exporter/raw/master/examples/systemd/sysconfig.node_exporter
mkdir -p /var/lib/node_exporter/textfile_collector

# Add user for running node_exporter
useradd --shell /sbin/nologin node_exporter
chown node_exporter:node_exporter /var/lib/node_exporter/
chown node_exporter:node_exporter /var/lib/node_exporter/textfile_collector/

# Start service
systemctl daemon-reload
systemctl enable node_exporter
systemctl start node_exporter