module alpine prometheus node_exporter

main.tf

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+resource "null_resource" "alpine_prometheus_node_exporter" {
+  triggers = {
+    source = filesha256("${path.module}/node_exporter.initd")
+  }
+  connection {
+    type        = "ssh"
+    user        = "root"
+    host        = var.connection_ip
+    private_key = var.connection_private_key
+  }
+
+  provisioner "file" {
+    source      = "${path.module}/node_exporter.initd"
+    destination = "/tmp/node_exporter.initd"
+  }
+
+  provisioner "remote-exec" {
+    inline = [
+      "echo '#--------------------------------'",
+      "echo '# module prometheus_node_exporter'",
+      "echo '#--------------------------------'",
+      "wget -nc -q https://github.com/prometheus/node_exporter/releases/download/v${var.node_exporter_version}/node_exporter-${var.node_exporter_version}.linux-amd64.tar.gz",
+      "tar xzf node_exporter-${var.node_exporter_version}.linux-amd64.tar.gz node_exporter-${var.node_exporter_version}.linux-amd64/node_exporter",
+      "echo '# install node_exporter in /usr/sbin'",
+      "install -Dm755 node_exporter-${var.node_exporter_version}.linux-amd64/node_exporter /usr/sbin",
+      #
+      "echo '# install service node_exporter'",
+      "install -Dm755 /tmp/node_exporter.initd  /etc/init.d/node_exporter",
+      #
+      "echo '# enable service node_exporter'",
+      "rc-update add node_exporter",
+      "/etc/init.d/node_exporter start",
+      #
+      "echo '# module DONE'",
+    ]
+  }
+
+}

node_exporter.initd

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+#!/sbin/openrc-run
+
+description="prometheus node exporter"
+command="/usr/sbin/node_exporter"
+command_args="--collector.disable-defaults --collector.cpu --collector.cpufreq --collector.diskstats --collector.filefd --collector.filesystem --collector.loadavg --collector.meminfo --collector.netclass --collector.netstat --collector.os --collector.time --collector.uname --collector.vmstat --web.disable-exporter-metrics "
+pidfile="/run/${RC_SVCNAME}.pid"
+
+# node_exporter stay in backgroud
+command_background=true
+# make a pid for me
+

variables.tf

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+variable "connection_ip" {
+  type        = string
+  description = "ipv4"
+}
+
+variable "connection_private_key" {
+  type        = string
+  description = "private key for terraform connection"
+  sensitive   = true
+}
+
+variable "node_exporter_version" {
+  type        = string
+  description = "like 1.5.2"
+}