mirror of
https://github.com/librenms/librenms-agent.git
synced 2024-05-09 09:54:52 +00:00
373 lines
7.8 KiB
Plaintext
373 lines
7.8 KiB
Plaintext
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#!/usr/bin/perl
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=head1 NAME
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check_drbd - Nagios plugin for DRBD
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=head1 SYNOPSIS
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B<check_drbd> [B<--verbose> | B<-v>]
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=head1 DESCRIPTION
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B<check_drbd> is a Nagios plugin for DRBD. It checks the connection state,
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resource roles and disk states for every configured DRBD resource, and
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produces a WARNING or CRITICAL alert if anything is amiss. The states
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of both the local and remote sides of each connection are monitored.
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=head2 Nagios status information
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The status information emitted by this plugin is similar to the information
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in F</proc/drbd>:
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drbd0: Connected Primary/Secondary UpToDate/UpToDate
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| | | | | Remote disk state
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| | | | Local disk state
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| | | Remote resource role
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| | Local resource role
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| Connection state
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DRBD device
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If more than one device is present, and all devices are OK, the output is
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summarised:
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drbd0: PriConUpT, drbd1: SecConUpT
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If any devices are not OK, the output contains their statuses in full.
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=head2 Nagios performance data
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Complete performance data is emitted for all configured DRBD resources:
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=over
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=item drbdI<*>_ns
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=item drbdI<*>_nr
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The volume of network data sent to and received from the peer, in kiB.
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=item drbdI<*>_dw
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=item drbdI<*>_dr
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The volume of network data written to and read from the local disk, in kiB.
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=item drbdI<*>_al
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The number of updates of the activity log area of the metadata.
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=item drbdI<*>_lo
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The number of open requests to the local I/O subsystem issued by DRBD.
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=item drbdI<*>_pe
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The number of requests sent to the peer but not yet been answered by the latter.
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=item drbdI<*>_ua
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The number of requests received by the peer but not yet been answered by the latter.
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=item drbdI<*>_ap
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The number of block I/O requests forwarded by DRBD, but not yet answered by DRBD.
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=item drbdI<*>_ep
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The number of epoch objects.
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=item drbdI<*>_oos
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The amount of storage currently out-of-sync, in kiB.
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=back
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=head1 OPTIONS
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=over
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=item B<-v>, B<--verbose>
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Increase the verbosity of the output messages. This disables the Nagios status
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information summarisation described above: all resources' statuses are printed
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in full.
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=back
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=head1 EXIT STATUS
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=over
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=item 0
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All resources are OK.
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=item 1
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Some resources are not OK, but do not need immediate attention.
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=item 2
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Some resources are not OK and need immediate attention.
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=item 3
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An error occurred while collecting the resources' statuses.
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=back
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=head1 FILES
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F</proc/drbd>
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=head1 SEE ALSO
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L<The DRBD Home Page|http://www.drbd.org/>
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=cut
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use strict;
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use warnings;
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use constant BASENAME => ($0 =~ m{.*/([^/]+)})[0] || 'check_drbd';
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use constant STATE_FILE => '/proc/drbd';
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use constant {
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OK => 0,
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WARNING => 1,
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CRITICAL => 2,
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UNKNOWN => 3,
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};
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use Getopt::Long;
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use IO::File;
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sub help;
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sub usage;
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sub perfdata;
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sub ok;
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sub warning;
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sub critical;
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sub unknown;
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sub get_state;
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$SIG{__DIE__} = sub {
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die @_ if $^S;
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print @_;
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exit UNKNOWN;
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};
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my $verbose;
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Getopt::Long::Configure('bundling', 'no_ignore_case');
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GetOptions(
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'verbose|v+' => \$verbose,
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'help|?' => sub { help; exit 0 },
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'usage' => sub { usage; exit 0 },
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) and @ARGV == 0
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or do { usage; exit UNKNOWN };
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my @state = get_state;
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my $status = OK;
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print "<<<drbd>>>\n";
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foreach my $id (0 .. $#state) {
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my $device = $state[$id]
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or next;
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# Assume CRITICAL by default
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foreach (qw( cs )) {
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$device->{"${_}_level"} = {
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Connected => OK,
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Unconfigured => OK,
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StandAlone => WARNING,
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SyncingAll => WARNING,
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SyncingQuick => WARNING,
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SyncSource => WARNING,
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SyncTarget => WARNING,
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VerifyS => WARNING,
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VerifyT => WARNING,
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Disconnecting => WARNING,
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TearDown => WARNING,
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StartingSyncS => WARNING,
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StartingSyncT => WARNING,
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WFSyncUUID => WARNING,
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}->{$device->{$_}};
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$device->{"${_}_level"} = CRITICAL unless defined $device->{"${_}_level"};
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if ($device->{oos}) {
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$device->{oos_level} = {
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StartingSyncS => OK,
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StartingSyncT => OK,
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SyncSource => OK,
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SyncTarget => OK,
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PausedSyncS => OK,
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PausedSyncT => OK,
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}->{$device->{$_}};
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$device->{oos_level} = CRITICAL unless defined $device->{oos_level};
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}
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}
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foreach (qw( ro pro )) {
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$device->{"${_}_level"} = {
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Primary => OK,
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Secondary => OK,
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}->{$device->{$_}};
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$device->{"${_}_level"} = CRITICAL unless defined $device->{"${_}_level"};
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}
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foreach (qw( ds pds )) {
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$device->{"${_}_level"} = {
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UpToDate => OK,
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Consistent => OK,
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Negotiating => WARNING,
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Attaching => WARNING,
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}->{$device->{$_}};
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$device->{"${_}_level"} = CRITICAL unless defined $device->{"${_}_level"};
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}
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my @extra;
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if ($device->{oos}) {
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push @extra, sprintf '%d kiB out-of-sync', $device->{oos};
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}
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if ($device->{iof} !~ /^r.--(.(-)?)?$/) {
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$device->{iof_level} = CRITICAL;
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push @extra, sprintf 'I/O flags: %s', $device->{iof};
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}
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my $extra = @extra ? sprintf(' (%s)', join ', ', @extra) : '';
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my $level = OK;
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foreach (grep /_level$/, keys %$device) {
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$level = $device->{$_} if $level < $device->{$_};
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}
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$status = $level if $status < $level;
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$device->{level} = $level;
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$device->{info} = sprintf 'drbd%d:cs=%s|ro=%s|pro=%s|ds=%s|pds=%s|extra=%s', $id, $device->{cs}, $device->{ro}, $device->{pro}, $device->{ds}, $device->{pds}, $extra;
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$device->{short} = sprintf 'drbd%d: %0.3s%0.3s%0.3s%s', $id, $device->{ro}, $device->{cs}, $device->{ds}, $extra; # Role and connstate reversed, like old check_drbd
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foreach (qw( ns nr dw dr al bm )) {
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my $value = $device->{$_};
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defined $value
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or next;
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perfdata "${_}=${value}";
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}
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foreach (qw( lo pe ua ap oos )) {
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my $value = $device->{$_};
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defined $value
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or next;
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perfdata "${_}=${value}";
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}
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}
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@state
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or critical 'No DRBD volumes present';
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if ($status) {
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my $message = join ', ', map $_->{info}, grep { defined and $_->{level} } @state;
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if ($status == WARNING) {
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warning $message;
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} else {
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critical $message;
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}
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} else {
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my $message = join ', ', map { ($verbose || @state == 1) ? $_->{info} : $_->{short} } grep defined, @state;
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ok $message;
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}
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die;
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###########################################################################
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sub help {
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print <<EOF;
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Usage: @{[BASENAME]} [OPTION...]
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Check DRBD resources.
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Plugin options:
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-v, --verbose Increase verbosity
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Help options:
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-?, --help Give this help list
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--usage Give a short usage message
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EOF
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}
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sub usage {
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print <<EOF;
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Usage: @{[BASENAME]} [-v?] [--verbose] [--help] [--usage]
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EOF
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}
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###########################################################################
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{
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my @perfdata;
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sub perfdata { push @perfdata, @_ }
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sub _exit {
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my ($status, $message) = @_;
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if (defined $message) {
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print $message;
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} else {
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print qw( OK WARNING CRITICAL )[$status] || 'UNKNOWN';
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}
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if (my $perfdata = shift @perfdata) {
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print "|$perfdata";
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}
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# print "\n";
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if (@perfdata) {
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print '|';
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print map "$_|", @perfdata;
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}
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print "\n";
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exit $status;
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}
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}
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sub ok { _exit OK, @_ }
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sub warning { _exit WARNING, @_ }
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sub critical { _exit CRITICAL, @_ }
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sub unknown { _exit UNKNOWN, @_ }
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###########################################################################
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sub get_state {
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my $io = new IO::File(STATE_FILE)
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or critical "Could not open @{[STATE_FILE]} for reading: $!";
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# 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r----
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# ns:0 nr:20492 dw:20480 dr:124 al:5 bm:1296 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:0
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my @state;
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my $device;
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while (<$io>) {
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if (m(^ \s* (\d+): \s* cs:(\w+) \s+ (?:ro|st):(\w+)/(\w+) \s+ ds:(\w+)/(\w+) \s+ \S+ \s+ (\S+))x) {
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$device = $state[$1] = {
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cs => $2,
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ro => $3,
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pro => $4,
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ds => $5,
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pds => $6,
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iof => $7,
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};
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next;
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};
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$device or next;
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$device->{$1} = $2 while /(\w+):(\S+)/g;
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}
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@state;
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}
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