node.sh

node.sh

#!/bin/bash
# filepath: node.sh
# Usage: curl -s https://raw.githubusercontent.com/your-repo/node.sh | bash -s <ORG>

ORG="${1}"
NODE_EXPORTER_VERSION="1.9.1"
NODE_EXPORTER_ARCH="amd64"
NODE_EXPORTER_USER="node_exporter"
NODE_EXPORTER_BIN_PATH="/${ORG}/node-exporter/bin/node_exporter"
NODE_EXPORTER_DOWNLOAD_URL="https://github.com/prometheus/node_exporter/releases/download/v${NODE_EXPORTER_VERSION}/node_exporter-${NODE_EXPORTER_VERSION}.linux-${NODE_EXPORTER_ARCH}.tar.gz"

if [ -x "$NODE_EXPORTER_BIN_PATH" ]; then
    CURRENT_VERSION=$($NODE_EXPORTER_BIN_PATH --version 2>&1 | grep version | awk '{print $3}')
else
    CURRENT_VERSION=""
fi

if [[ "$CURRENT_VERSION" == "$NODE_EXPORTER_VERSION" ]]; then
    echo "Node Exporter version $NODE_EXPORTER_VERSION is already installed."
    exit 0
fi

if ! id -u $NODE_EXPORTER_USER >/dev/null 2>&1; then
    sudo useradd --system --no-create-home --shell /sbin/nologin $NODE_EXPORTER_USER
fi

sudo mkdir -p /${ORG}/node-exporter/bin
sudo mkdir -p /${ORG}/node-exporter
sudo chown -R $NODE_EXPORTER_USER: /${ORG}/node-exporter

cd /tmp
wget -O node_exporter.tar.gz "$NODE_EXPORTER_DOWNLOAD_URL"
tar -xzf node_exporter.tar.gz

sudo cp "node_exporter-${NODE_EXPORTER_VERSION}.linux-${NODE_EXPORTER_ARCH}/node_exporter" "$NODE_EXPORTER_BIN_PATH"
sudo chown $NODE_EXPORTER_USER: "$NODE_EXPORTER_BIN_PATH"
sudo chmod u+x "$NODE_EXPORTER_BIN_PATH"
sudo chmod 755 "$NODE_EXPORTER_BIN_PATH"

sudo tee /etc/systemd/system/node_exporter.service > /dev/null <<EOF
[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=$NODE_EXPORTER_USER
Group=$NODE_EXPORTER_USER
Type=simple
ExecStart=$NODE_EXPORTER_BIN_PATH
Restart=on-failure
RestartSec=5s
ProtectSystem=full
ProtectHome=true
NoNewPrivileges=true
PrivateTmp=true

[Install]
WantedBy=multi-user.target
EOF

sudo systemctl daemon-reload
sudo systemctl enable --now node_exporter

echo "Node Exporter has been installed and started."