Setup a node_exporter systemd service

setup-node_exporter-systemd.sh

#!/bin/bash -eEl


function node_exporter_name() {
    arch=$(uname -m)
    if [ "${arch}" = "aarch64" ]; then
        arch="arm64"
    elif [ "${arch}" = "x86_64" ]; then
        arch="amd64"
    fi
    echo "node_exporter-0.18.1.linux-${arch}"
}

function node_exporter_link() {
    url="https://github.com/prometheus/node_exporter/releases/download"
    version="v0.18.1"
    tar="$(node_exporter_name).tar.gz"

    echo "${url}/${version}/${tar}"
}

rm -f "$(node_exporter_name)*"
echo "Pulling node_exporter tarball..."
wget -nv "$(node_exporter_link)"
echo "Unpacking..."
tar xzf "$(node_exporter_name).tar.gz"

echo "Creating and setting up the service..."
cd "$(node_exporter_name)"
svc_name="node_exporter.service"
cat >${svc_name} <<EOF
[Unit]
Description=Node Exporter
Wants=network-online.service
After=network-online.service

[Service]
ExecStart=/usr/sbin/node_exporter --collector.systemd \$OPTIONS
User=$USER
KillMode=process
KillSignal=SIGTERM
TimeoutStopSec=5min
Restart=always

[Install]
WantedBy=multi-user.target
EOF

sudo ln -fs `pwd`/node_exporter /usr/sbin/node_exporter
sudo cp ${svc_name} /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl start ${svc_name}
sudo systemctl status ${svc_name}