Prometheus Node Exporter installer script for AsusWRT Merlin routers with config examples

00_Node_exporter_installer_script_for_AsusWRT_Merlin.md

Prometheus Node Exporter installer script for AsusWRT Merlin

Installation

curl -sL https://gist.githubusercontent.com/vi7/bc27529bd4803576fefc479dbd326dfa/raw/node_exporter_installer_asuswrt_merlin.sh | sh \
&& rm -f node_exporter_installer_asuswrt_merlin.sh

Running Node Exporter

Create launcher script /jffs/addons/node_exporter/node_exporter.sh with the following contents:

#!/usr/bin/env sh

nohup /jffs/addons/node_exporter/node_exporter \
  --log.level=error \
  --collector.filesystem.mount-points-exclude='^/(dev|proc|run/credentials/.+|sys|var/lib/docker/.+)($|/)' \
  --collector.filesystem.fs-types-exclude='^(autofs|binfmt_misc|bpf|cgroup2?|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|iso9660|mqueue|nsfs|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|selinuxfs|squashfs|sysfs|tracefs)$' \
  --no-collector.bcache \
  --no-collector.btrfs \
  --no-collector.dmi \
  --no-collector.fibrechannel \
  --no-collector.infiniband \
  --no-collector.ipvs \
  --no-collector.mdadm \
  --no-collector.nvme \
  --no-collector.rapl \
  --no-collector.tapestats \
  --no-collector.xfs \
  --no-collector.zfs |\
  logger -s -c -t node_exporter

Add following lines to the services start script /jffs/scripts/services-start:

logger -c -t services-start "Starting Node Exporter"
/jffs/addons/node_exporter/node_exporter.sh &

Reboot router

Node Exporter metrics will be available on <your-router-address>:9100/metrics

node_exporter_installer_asuswrt_merlin.sh

#!/usr/bin/env sh

#############
### USAGE ###
#############

# 1. Modify version, arch and install path vars below if needed
# 
# 2. SSH to the router, `cd /jffs` and run:
#
# curl -sL https://gist.githubusercontent.com/vi7/bc27529bd4803576fefc479dbd326dfa/raw/node_exporter_installer_asuswrt_merlin.sh | sh && rm -f node_exporter_installer_asuswrt_merlin.sh



VERSION="1.3.1"
ARCH="linux-arm64"
INSTALL_PATH="/jffs/addons/node_exporter"


mkdir -p "$INSTALL_PATH"
cd "$INSTALL_PATH"
if [ ! -f node_exporter ]
then
  curl -LO "https://github.com/prometheus/node_exporter/releases/download/v${VERSION}/node_exporter-${VERSION}.${ARCH}.tar.gz"
  tar xzvf node_exporter-"${VERSION}"."${ARCH}".tar.gz
  mv node_exporter-"${VERSION}"."${ARCH}"/node_exporter .
  chmod a+x node_exporter
  rm -rvf node_exporter-"${VERSION}"."${ARCH}"*
  echo "Node Exporter is installed to the $INSTALL_PATH"
else
  echo "SKIPPING! Node Exporter seems to be present in the $INSTALL_PATH"
fi