Simple Prometheus node_exporter install script (Updated for 1.0.1)

node_exporter.sh

#!/bin/bash

version="${VERSION:-1.0.1}"
arch="${ARCH:-linux-amd64}"
bin_dir="${BIN_DIR:-/usr/local/bin}"

wget "https://github.com/prometheus/node_exporter/releases/download/v$version/node_exporter-$version.$arch.tar.gz" \
    -O /tmp/node_exporter.tar.gz

mkdir -p /tmp/node_exporter

cd /tmp || { echo "ERROR! No /tmp found.."; exit 1; }

tar xfz /tmp/node_exporter.tar.gz -C /tmp/node_exporter || { echo "ERROR! Extracting the node_exporter tar"; exit 1; }

cp "/tmp/node_exporter/node_exporter-$version.$arch/node_exporter" "$bin_dir"
chown root:staff "$bin_dir/node_exporter"

cat <<EOF > /etc/systemd/system/node_exporter.service
[Unit]
Description=Prometheus node exporter
After=local-fs.target network-online.target network.target
Wants=local-fs.target network-online.target network.target

[Service]
Type=simple
ExecStartPre=-/sbin/iptables -I INPUT 1 -p tcp --dport 9100 -s 127.0.0.1 -j ACCEPT
ExecStartPre=-/sbin/iptables -I INPUT 3 -p tcp --dport 9100 -j DROP
ExecStart=/usr/local/bin/node_exporter

[Install]
WantedBy=multi-user.target
EOF

systemctl enable node_exporter.service
systemctl start node_exporter.service

echo "SUCCESS! Installation succeeded!"

@carlocorradini Looks like a good improvement on this simple script. One thing I would optional though would be the iptables rules created during the service start. They can be placed "anywhere" under the [Service] section so you can just append them to the file if the feature flag has been enabled.

Might also be worth to add ExecStopPost to remove the iptables rules so in case the service is restarted multiple times there are no leftover iptables rules.

@galexrt Thanks!
Do you want to create a simple PR? 🥳🤯

@carlocorradini here you go carlocorradini/node_exporter_installer#2