180 lines
6.0 KiB
Perl
Executable File
180 lines
6.0 KiB
Perl
Executable File
#! /usr/bin/perl -w
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use strict;
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use Munin::Plugin;
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=head1 NAME
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relayd - Plugin to show statistics about relayd load balancer.
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=head1 CONFIGURATION
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The following environment variables are used by this plugin:
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=over 4
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=item logfile
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The file where syslog logs relayd's action (Default:
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/var/log/relayd.log)
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You need an entry like this in your syslog.conf for this to work:
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!relayd
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*.* /var/log/relayd.log
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The directive:
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log updates
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is also necessary in relayd.conf.
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=item configfile
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The relayd.conf configfile (Default: /usr/local/etc/relayd.conf)
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=back
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=head1 TODO
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* determine if the table is completely down (may be *impossible* if a partial
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downtime becomes complete between two runs)
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=head1 MAGIC MARKERS
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#%# family=contrib
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#%# capabilities=autoconf
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=cut
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# wrapper around clean_fieldname() which is too dumb to parse IPs
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sub clean_host($) {
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my $host = shift;
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my $clean = clean_fieldname($host);
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$clean = clean_fieldname('host'.$host) unless ($clean ne '_');
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return $clean;
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}
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my $logfile = '/var/log/relayd.log';
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my $configfile = "/usr/local/etc/relayd.conf";
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need_multigraph();
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(defined($ENV{'logfile'})) and $logfile = $ENV{'logfile'};
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(defined($ENV{'configfile'})) and $configfile = $ENV{'configfile'};
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my $cmd = (defined($ARGV[0])) ? $ARGV[0] : '';
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my @hosts = ();
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open(my $conf, "<", $configfile) or die "can't open $configfile: $!";
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my $content = join("", <$conf>);
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while ( $content =~ /table\s*<([^>]+)>\s*{([^}]+)}/g) {
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my $hosts = $2;
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print "table: $1, " if $Munin::Plugin::DEBUG;
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$hosts =~ s/#.*$//mg; # comments
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$hosts =~ s/^\s+//mg; # trim spaces before lines
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print "hosts: $hosts\n" if $Munin::Plugin::DEBUG;
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push @hosts , split /\s+/, $hosts;
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}
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if ($cmd eq 'config') {
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print("multigraph relayd_avail\n");
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print("graph_title Relayd host availability\n");
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print("graph_args --upper-limit 100\n");
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print("graph_vlabel % availability\n");
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print("graph_category loadbalancer\n");
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print("graph_info Ratio of time when this host was up. This is provided by relayd itself (not averaged by this plugin)\n");
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for my $host (@hosts) {
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my $clean = clean_host($host);
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print("$clean.label $host\n");
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}
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print("multigraph relayd_incidents\n");
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print("graph_title Relayd host incidents\n");
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print("graph_args --lower-limit 0\n");
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print("graph_vlabel down incidents\n");
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print("graph_category loadbalancer\n");
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print("graph_info Number of times this host went down\n");
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for my $host (@hosts) {
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my $clean = clean_host($host);
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print("$clean.type ABSOLUTE\n");
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print("$clean.label $host\n");
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}
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exit(0);
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}
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elsif ($cmd eq 'autoconf') {
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sub fail($) {
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my $msg=shift;
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print "no ($msg)\n";
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exit(1);
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}
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fail("$logfile unreadable)") unless -r $logfile;
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fail("$configfile unreadable") unless -r $configfile;
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open(my $status, "relayctl show summary|") or fail("cannot open relayctl pipe: $!");
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() = <$status>; # necessary to avoid SIGPIPE to relayctl, which would make it fail
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close($status) or fail("cannot run relayctl: $!");
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print "yes\n";
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exit(0);
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}
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# sample lines:
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# Mar 8 23:05:28 rtr0 relayd[81814]: host 209.44.112.101, check http code (2000ms), state up -> down, availability 97.83%
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# Mar 8 23:05:28 rtr0 relayd[81814]: host 209.44.112.96, check http code (2001ms), state up -> down, availability 98.12%
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# Mar 8 23:05:31 rtr0 relayd[81813]: table hag: 1 added, 2 deleted, 0 changed, 0 killed
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# Mar 8 23:05:31 rtr0 relayd[81814]: host 209.44.112.101, check http code (3ms), state down -> up, availability 97.83%
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# Mar 8 23:05:31 rtr0 relayd[81814]: host 209.44.112.96, check http code (3ms), state down -> up, availability 98.12%
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# Mar 8 23:05:36 rtr0 relayd[81813]: table hag: 2 added, 1 deleted, 0 changed, 0 killed
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# Mar 8 23:21:58 rtr0 relayd[81814]: host 209.44.112.96, check http code (2000ms), state up -> down, availability 98.12%
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# Mar 8 23:22:01 rtr0 relayd[81813]: table hag: 0 added, 1 deleted, 0 changed, 0 killed
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my (%avail, %down);
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my $pos = undef;
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($pos) = restore_state();
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$pos = 0 unless defined($pos);
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my ($log,$reset) = tail_open($logfile,$pos);
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#open(my $log, "$logtail -f $logfile -o $offsetfile |") or die("cannot open $logfile: $!");
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#open(my $log, "tail -100 $logfile |") or die("cannot open $logfile: $!");
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while (<$log>) {
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if (/host ([^,]*), check[^,]*, state [^>]* -> ([^,]*), availability ([0-9]+.[0-9]+)%/) {
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my $host = clean_host($1);
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$down{$host} = 0 unless defined $down{$host};
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$down{$host}++ if $2 eq 'down';
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# yes, we overwrite previous value and take only the recent one. be sad.
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$avail{$host} = $3;
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}
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}
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$pos = tail_close($log) or warn "failed to close pipe: $!";
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save_state($pos);
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# get missing availability values from relayctl, if necessary
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for my $host (@hosts) {
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my $ran = 0;
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my $clean = clean_host($host);
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if (!defined $avail{$clean} && !$ran) {
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open(my $status, "relayctl show summary|") or die "can't open relayctl: $!";
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while (<$status>) {
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if (/([\w\.]+)\s+(\d+\.\d+)%/) {
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my $h = clean_host($1);
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print "found spare value: $2 for $h\n" if $Munin::Plugin::DEBUG;
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$avail{$h} = $2 unless defined($avail{$h});
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}
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}
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close $status or die "can't close pipe: $!";
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$ran = 1;
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}
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}
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print "multigraph relayd_avail\n";
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for my $host (@hosts) {
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my $clean = clean_host($host);
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print "$clean.value " . ($avail{$clean} || 'NaN'). "\n";
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}
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print "multigraph relayd_incidents\n";
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for my $host (@hosts) {
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my $clean = clean_host($host);
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print "$clean.value " . ($down{$clean} || 0). "\n";
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}
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