prometheus: add node-exporter installer

prometheus/scripts/install.node-exporter.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+cd /tmp
+# download archived binary
+wget https://github.com/prometheus/node_exporter/releases/download/v1.8.2/node_exporter-1.8.2.linux-amd64.tar.gz
+# extract tar
+tar -xvf node_exporter-1.8.2.linux-amd64.tar.gz
+# cd to extracted dir
+cd node_exporter-1.8.2.linux-amd64
+# everybody can execute it
+sudo chmod a+x node_exporter
+# copy node_exporter
+sudo cp node_exporter /usr/local/bin
+#create a new service
+sudo vim /etc/systemd/system/node_exporter.service
+
+cat << EOF > /etc/systemd/system/node_exporter.service
+[Unit]
+Description=Node Exporter
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=mmkb
+Group=mmkb
+Type=simple
+ExecStart=/usr/local/bin/node_exporter
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+# enable and start service
+sudo systemctl enable node_exporter
+sudo systemctl start node_exporter
+sudo systemctl status node_exporter.service