Initial skills documentation — 25 categories, all SKILL.md + references + scripts

2026-07-15 17:42:20 -04:00
commit 1b4fcd4427
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+#!/bin/bash
+# install-node-exporter.sh
+# Installs Prometheus Node Exporter as a systemd service on any Linux server.
+# Usage: bash install-node-exporter.sh [<host>]
+#   Without <host>: install locally
+#   With <host>: install via SSH (requires root SSH key at ~/.ssh/itpp-infra)
+
+set -euo pipefail
+
+NODE_EXPORTER_VERSION="1.8.2"
+ARCH="linux-amd64"
+
+install_local() {
+    if systemctl is-active --quiet node_exporter 2>/dev/null; then
+        echo "node_exporter already running — skipping install"
+        return 0
+    fi
+
+    echo "==> Downloading node_exporter ${NODE_EXPORTER_VERSION}..."
+    cd /tmp
+    wget -q "https://github.com/prometheus/node_exporter/releases/download/v${NODE_EXPORTER_VERSION}/node_exporter-${NODE_EXPORTER_VERSION}.${ARCH}.tar.gz"
+    tar xzf "node_exporter-${NODE_EXPORTER_VERSION}.${ARCH}.tar.gz"
+
+    echo "==> Installing binary..."
+    cp "node_exporter-${NODE_EXPORTER_VERSION}.${ARCH}/node_exporter" /usr/local/bin/
+    chmod 755 /usr/local/bin/node_exporter
+
+    echo "==> Creating systemd service..."
+    cat > /etc/systemd/system/node_exporter.service << 'EOF'
+[Unit]
+Description=Prometheus Node Exporter
+After=network.target
+
+[Service]
+Type=simple
+User=nobody
+Group=nogroup
+ExecStart=/usr/local/bin/node_exporter \
+  --web.listen-address=:9100 \
+  --collector.filesystem.mount-points-exclude=^/(sys|proc|dev|host|etc)($$|/)
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+    systemctl daemon-reload
+    systemctl enable node_exporter
+    systemctl start node_exporter
+    systemctl status node_exporter --no-pager -l | head -10
+
+    echo "==> Cleaning up..."
+    rm -rf "/tmp/node_exporter-${NODE_EXPORTER_VERSION}.${ARCH}"*
+
+    echo "==> node_exporter installed and running on port 9100"
+}
+
+if [ $# -eq 0 ]; then
+    install_local
+else
+    HOST="$1"
+    echo "==> Installing node_exporter on ${HOST}..."
+    # Copy install script and run remotely
+    scp -o StrictHostKeyChecking=no -i ~/.ssh/itpp-infra "$0" "root@${HOST}:/tmp/install-node-exporter.sh"
+    ssh -o StrictHostKeyChecking=no -i ~/.ssh/itpp-infra "root@${HOST}" "bash /tmp/install-node-exporter.sh"
+    echo "==> node_exporter installed on ${HOST}"
+fi