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#!/bin/sh
# -*- coding: utf-8 -*-
# Copyright (C) 2019 Checkmk GmbH - License: GNU General Public License v2
# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
# conditions defined in the file COPYING, which is part of this source code package.
# NOTE: This agent plugin has been developed primarily for the Kubernetes use
# case (more details, see function definition). For this reason, it is
# NOT supported by the agent bakery.
# Reason for this no-op: shellcheck disable=... before the first command disables the error for the
# entire script.
:
# Disable unused variable error (needed to keep track of version)
# shellcheck disable=SC2034
CMK_VERSION="2.3.0p38"
CONFIG_FILE="${MK_CONFDIR}/lnx_container_host_if.cfg"
__read_network_interface_files() {
path=${1}
files=${2}
for name in ${files}; do
printf "%s\v%s\t" "${name}" "$(cat "${path}/${name}" 2>/dev/null)"
done
}
section_lnx_container_host_if() {
# This section essentially provides the same information as lnx_if, therefore
# only one of these sections should be used. It is recommended to use lnx_if
# (default in Checkmk).
# lnx_if obtains its data from /proc/net/dev, this section obtains it from
# /sys/class/net.
# Use case: Kubernetes: The Checkmk agent runs inside a container on the
# Kubernetes cluster but aims to collect information of the underlying node.
# The node can be a real server, a VM, or a cloud server instance.
# /proc/net/dev only shows interfaces of the host namespace (in this case
# the container). Instead, the files in /sys/class/net are mounted from the
# node into the container and provide network information of the node in this
# way. Note that agent sections are sourced and run selectively, the lnx_if
# section is therefore excluded.
# HOST_PATH_PREFIX: This environment variable is used to provide a way to
# mount /sys/class/net to an alternative path. If not set, the default location
# is the system path (/sys/class/net).
interface_filepath="${HOST_PATH_PREFIX}/sys/class/net"
interface_statistics_subpath="statistics"
network_interface_metadata="ifindex ifalias address type carrier"
network_interface_speed="speed"
network_interface_rx_stats="rx_bytes rx_packets rx_errors rx_dropped multicast"
network_interface_tx_stats="tx_bytes tx_packets tx_errors tx_dropped tx_fifo_errors"
echo "<<<lnx_container_host_if:sep(09)>>>"
for if_path in "${interface_filepath}"/*; do
# Check if Path is a directory, if not continue
[ -d "${if_path}" ] || continue
# Check if directory is empty, if true continue
[ -n "$(ls -A "${if_path}")" ] || continue
printf "name\v%s\t" "$(basename "${if_path}")"
__read_network_interface_files "${if_path}" "${network_interface_metadata}"
__read_network_interface_files "${if_path}" "${network_interface_speed}"
__read_network_interface_files "${if_path}/${interface_statistics_subpath}" "${network_interface_rx_stats}"
__read_network_interface_files "${if_path}/${interface_statistics_subpath}" "${network_interface_tx_stats}"
printf "\n"
done
}
main() {
if [ -f "${CONFIG_FILE}" ]; then
# shellcheck source=agents/cfg_examples/lnx_container_host_if.cfg
. "${CONFIG_FILE}"
fi
section_lnx_container_host_if
}
[ -z "${MK_SOURCE_AGENT}" ] && main