node_exporter fpm rpm (credit to https://gist.github.com/dreampuf/5531fd5b131e73fe97d6b871fce60bb0)

build_node_exporter.sh

#!/bin/sh 

VERSION=${VERSION:-1.6.1}
URL=https://github.com/prometheus/node_exporter/releases/download/v${VERSION}/node_exporter-${VERSION}.linux-amd64.tar.gz
FILENAME=${URL##*/}
ROOT_PATH=$PWD/opt/pkg
APP_ROOT_PATH=$ROOT_PATH/opt/node_exporter
ITERATION=${ITERATION:-1}
mkdir -p $APP_ROOT_PATH/script
curl -sLO $URL
tar -C $APP_ROOT_PATH -xvf $FILENAME --strip-components=1
rm $FILENAME

cat > $APP_ROOT_PATH/script/after-install.sh <<'EOF'
#/usr/bin/env bash

/usr/sbin/useradd node_exporter &>/dev/null

/usr/bin/systemctl enable --now node_exporter &>/dev/null || true
/usr/bin/systemctl daemon-reload
EOF
cat > $APP_ROOT_PATH/script/before-remove.sh <<'EOF'
#/usr/bin/env bash

/usr/bin/systemctl disable --now node_exporter &>/dev/null || true
EOF
cat > $APP_ROOT_PATH/script/after-remove.sh <<'EOF'
#/usr/bin/env bash

/usr/bin/systemctl daemon-reload
EOF

mkdir -p $ROOT_PATH/etc/systemd/system
cat > $ROOT_PATH/etc/systemd/system/node_exporter.service <<'EOF'
[Unit]
Description=
Requires=network.target
After=network.target
Requires=time-sync.target
After=time-sync.target

[Service]
Type=simple
ExecStart=/opt/node_exporter/node_exporter --web.listen-address=0.0.0.0:9100 --log.level=warn --collector.interrupts --collector.logind --collector.meminfo_numa --collector.processes --collector.systemd --collector.tcpstat  --collector.textfile.directory=/run/node_exporter
User=node_exporter
Group=node_exporter
StandardOutput=journal
StandardError=journal
SyslogIdentifier=node_exporter
Restart=always
RestartSec=60
RuntimeDirectory=node_exporter
RuntimeDirectoryMode=0777

[Install]
WantedBy=default.target
EOF


docker run -it --rm -v $ROOT_PATH:/opt/pkg -w /opt/pkg islandsound/fpm -s dir -t rpm -n node_exporter -v $VERSION --iteration $ITERATION --rpm-user root --rpm-group root --prefix / -C /opt/pkg/ -f --after-install opt/node_exporter/script/after-install.sh --before-remove opt/node_exporter/script/before-remove.sh --after-remove opt/node_exporter/script/after-remove.sh

mv ./opt/pkg/node_exporter-$VERSION-$ITERATION.x86_64.rpm $PWD/