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Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
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Georg Pfuetzenreuter 2024-08-29 03:03:35 +02:00
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# Makefile for BuddyCheck
#
# Copyright 2024, Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
#
# Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European Commission - subsequent versions of the EUPL (the "Licence").
# You may not use this work except in compliance with the Licence.
# An English copy of the Licence is shipped in a file called LICENSE along with this applications source code.
# You may obtain copies of the Licence in any of the official languages at https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12.
PREFIX=/usr/local
BINDIR=$(PREFIX)/bin
MANDIR=$(PREFIX)/man
usage:
@echo 'Available targets: "install", "uninstall"'
install:
install -d $(DESTDIR)$(BINDIR) $(DESTDIR)$(MANDIR)/man1
install buddycheck.pl $(DESTDIR)$(BINDIR)/buddycheck
pod2man buddycheck.1 > $(DESTDIR)$(MANDIR)/man1/buddycheck.1
uninstall:
rm $(DESTDIR)$(BINDIR)/buddycheck
rm $(DESTDIR)$(MANDIR)/man1/buddycheck.1

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BuddyCheck is a tool querying the systemd health through Prometheus Node Exporter.
Reference buddycheck(1) for details.

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=head1 NAME
BuddyCheck - Report the systemd health of a host
=head1 SYNPOSIS
buddycheck
BUDDYCHECK_HOST=localhost buddycheck
BUDDYCHECK_HOST=example.com BUDDYCHECK_PORT=9000 buddycheck
=head1 DESCRIPTION
This application queries the "node_systemd_system_running" metric of a Prometheus Node Exporter with enabled systemd collector
and reflects the metric result with both a human understandable message printed to stderr and a computer parseable exit code.
If the remote system is healthy, the application will report "Buddy is healthy" and exit with 0.
With any other responses, the remote system should be assumed as faulty.
=head1 CAVEATS
The application does not assess whether the remote HTTP server is indeed a Prometheus Node Exporter.
An abitrary HTTP server could easily serve the string "node_systemd_system_running" with a value of its choice.
=head1 EXIT CODES
0 HTTP server responded with metric, and result is 0
111 HTTP server did not respond
125 HTTP server responded with metric, result is not 1
255 HTTP response was not 200 or required variable was not set
=head1 AUTHOR
Georg Pfuetzenreuter
=head1 LICENSE
Licensed under the European Union Public Licence.

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#!/usr/bin/perl
# Return whether a system is healthy according to systemd by querying
# a Prometheus Node Exporter with enabled systemd collector running on it
#
# Copyright 2024, Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
#
# Licensed under the EUPL, Version 1.2 or - as soon they will be approved by the European Commission - subsequent versions of the EUPL (the "Licence").
# You may not use this work except in compliance with the Licence.
# An English copy of the Licence is shipped in a file called LICENSE along with this applications source code.
# You may obtain copies of the Licence in any of the official languages at https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12.
use 5.26.0;
use HTTP::Tiny;
use Data::Dumper;
my $buddy = $ENV{'BUDDYCHECK_HOST'};
die "Please set BUDDYCHECK_HOST\n" unless $buddy;
my $port = $ENV{'BUDDYCHECK_PORT'} || 9100;
my $response = HTTP::Tiny->new->get('http://' . $buddy . ':' . $port . '/metrics');
die "HTTP request failed\n" unless $response->{success};
say "$response->{protocol} $response->{status} $response->{reason}" unless $response->{status} == 200;
my $metric = grep {/^node_systemd_system_running/} $response->{content};
if ($metric == 1) {
say "Buddy is healthy"
} else {
say "Buddy is sick";
exit 125
}