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relayd statistics support for munin

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Antoine Beaupré 2012-03-09 02:25:35 -05:00
parent 731d83d841
commit 97fd896837
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plugins/relayd Executable file
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#! /usr/bin/perl -w
use strict;
use Munin::Plugin;
=head1 NAME
relayd - Plugin to show statistics about relayd load balancer.
=head1 CONFIGURATION
The following environment variables are used by this plugin:
=over 4
=item logfile
The file where MailScanner logs its action (Default:
/var/log/relayd.log)
=item logtail
The location of the logtail command (Default: /usr/sbin/logtail)
=item offsetfile
The location of the offset file (Default:
/var/log/munin/plugin-state/munin-relayd.offset)
=back
=head1 USAGE
Requires the logtail command somewhere in path
=head1 TODO
Parsing relayd.conf would allow us to do the following:
* determine the hosts in config (may be necessary!)
* determine if the table is completely down (may be *impossible* if a partial
downtime becomes complete between two runs)
=head1 MAGIC MARKERS
#%# family=contrib
#%# capabilities=
We should have "suggest" once we implement more than availability. We should
also autoconf (check if logtail and the logfile exist, basically).
See http://munin-monitoring.org/wiki/ConcisePlugins
=cut
my $logfile = '/var/log/relayd.log';
my $logtail = '/usr/sbin/logtail';
my $offsetfile = "/var/munin/plugin-state/munin-relayd.offset";
my $configfile = "/usr/local/etc/relayd.conf";
(defined($ENV{'logfile'})) and $logfile = $ENV{'logfile'};
(defined($ENV{'logtail'})) and $logtail = $ENV{'logtail'};
(defined($ENV{'offsetfile'})) and $offsetfile = $ENV{'offsetfile'};
(defined($ENV{'configfile'})) and $configfile = $ENV{'offsetfile'};
my $cmd = (defined($ARGV[0])) ? $ARGV[0] : '';
if ($cmd eq 'config') {
my @hosts = ();
open(my $conf, "<", $configfile);
my $content = join("", <$conf>);
while ( $content =~ /table\s*<([^>]*)>\s*{([^}]*)}/g) {
my $hosts = $2;
$hosts =~ s/#.*$//mg;
@hosts = split /\s+/, $hosts;
}
print("multigraph relayd_avail\n\n");
print("graph_title Relayd host availability\n");
print("graph_args --lower-limit 0\n");
print("graph_vlabel % availability\n");
print("graph_category Load balancer\n");
print("graph_info Ratio of time when this host was up. This is provided by relayd itself (not averaged by this plugin)\n");
for my $host (@hosts) {
my $clean = clean_fieldname($host);
print("$clean.label $host\n");
}
print("\nmultigraph relayd_incidents\n\n");
print("graph_title Relayd host incidents\n");
print("graph_args --lower-limit 0\n");
print("graph_vlabel down incidents\n");
print("graph_category Load balancer\n");
print("graph_info Number of times this host went down during \${graph_period}\n");
for my $host (@hosts) {
my $clean = clean_fieldname($host);
print("$clean.type ABSOLUTE\n");
print("$clean.label $host\n");
}
exit(0);
}
# sample lines:
# Mar 8 23:05:28 rtr0 relayd[81814]: host 209.44.112.101, check http code (2000ms), state up -> down, availability 97.83%
# Mar 8 23:05:28 rtr0 relayd[81814]: host 209.44.112.96, check http code (2001ms), state up -> down, availability 98.12%
# Mar 8 23:05:31 rtr0 relayd[81813]: table hag: 1 added, 2 deleted, 0 changed, 0 killed
# Mar 8 23:05:31 rtr0 relayd[81814]: host 209.44.112.101, check http code (3ms), state down -> up, availability 97.83%
# Mar 8 23:05:31 rtr0 relayd[81814]: host 209.44.112.96, check http code (3ms), state down -> up, availability 98.12%
# Mar 8 23:05:36 rtr0 relayd[81813]: table hag: 2 added, 1 deleted, 0 changed, 0 killed
# Mar 8 23:21:58 rtr0 relayd[81814]: host 209.44.112.96, check http code (2000ms), state up -> down, availability 98.12%
# Mar 8 23:22:01 rtr0 relayd[81813]: table hag: 0 added, 1 deleted, 0 changed, 0 killed
my (%avail, %down);
open(my $log, "$logtail -f $logfile -o $offsetfile |") or die("cannot open $logfile: $!");
#open(my $log, "tail -100 $logfile |") or die("cannot open $logfile: $!");
while (<$log>) {
if (/host ([^,]*), check[^,]*, state [^>]* -> ([^,]*), availability ([0-9]+.[0-9]+)%/) {
my $host = clean_fieldname($1);
$host = clean_fieldname('host'.$1) unless ($host ne '_');
$down{$host} = 0 unless defined $down{$host};
$down{$host}++ if $2 eq 'down';
# yes, we overwrite previous value and take only the recent one. be sad.
$avail{$host} = $3;
}
}
close($log) or warn "failed to close pipe: $!";
print "multigraph relayd_avail\n\n";
for my $host (keys %avail) {
print "$host.value " . $avail{$host} . "\n";
}
print "\nmultigraph relayd_incidents\n\n";
for my $host (keys %down) {
print "$host.value " . $down{$host} . "\n";
}