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check_ldap_slurpd_status.pl
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check_ldap_slurpd_status.pl
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#! /usr/bin/perl -w
#====================================================================
# What's this ?
#====================================================================
# This script parses files generated by slurpd (OpenLDAP replication server)
# displays if errors occured and if master and slaves are up2date
# Script designed for Nagios/NRPE ( http://www.nagios.org )
#
# Usage :
# You have to set the replica's name and port (as written in slapd.conf)
# ./check_ldap_slurpd_status -w warning_level -c critical_level [-h hostname] [-p hostport] [-v]
# The level must be given with 3 integers, for exemple 100,5,30
# The first integer are the entries in transition (not picked up by slurpd)
# The second integer are the rejected entries (not accepted by the slave)
# The third integer are the waiting entries (picked up by slurpd but not sent to the slave)
# If only one integer is given, the level will be the max of all entries (in transition + rejected + waiting)
# If no port is declared, 0 will be used
# If no host is declared, localhost will be used
# Option -v displays a lot of message, use for debug only
#
# Copyright (C) 2004 Clement OUDOT
# Copyright (C) 2009 LTB-project.org
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# GPL Licence : http://www.gnu.org/licenses/gpl.txt
#
#==========================================================================
#==========================================================================
# Modules
#==========================================================================
use strict;
use Getopt::Std;
use List::Util qw(max);
#==========================================================================
# Internal Parameters
#==========================================================================
# Directory where slurpd stores his files
my $slurpd_tempdir = "/var/openldap-slurp/replica";
# Replog file beetween slapd and slurpd, as written in slapd.conf
my $slapd_replog_file = "/var/replog";
# Nagios Codes
my %code = ( 'Ok' => 0, 'Warning' => 1, 'Critical' => 2, 'Unknown' => 3 );
#==========================================================================
# Command Line Parameters
#==========================================================================
my %opts;
getopt( 'wchpv', \%opts );
my $debug = 1 if ( exists( $opts{"v"} ) );
&usage unless ( exists( $opts{"w"} ) );
&usage unless ( exists( $opts{"c"} ) );
$opts{"h"} = "localhost" unless ( exists( $opts{"h"} ) );
$opts{"p"} = 0 unless ( exists( $opts{"p"} ) );
my $slave_name = $opts{"h"};
my $slave_port = $opts{"p"};
my $warning_level = $opts{"w"};
my $critical_level = $opts{"c"};
# See if warning_level and critical_level are given with 3 integers or just one
my @warning_level;
if ( $warning_level =~ /^(\d*)$/ ) {
# This is just one integer
$warning_level = $1;
if ($debug) {
print "Warning level set to $warning_level entries\n";
}
}
elsif ( $warning_level =~ /^(\d*),(\d*),(\d*)$/ ) {
# Three integers, comma separated
@warning_level = ( $1, $2, $3 );
if ($debug) {
print
"Warning level set to $1 entries in transition, $2 rejected entries and $3 waiting entries\n";
}
$warning_level = 0;
}
else {
# Bad usage
&usage;
}
my @critical_level;
if ( $critical_level =~ /^(\d*)$/ ) {
# This is just one integer
$critical_level = $1;
if ($debug) {
print "Critical level set to $critical_level entries\n";
}
}
elsif ( $critical_level =~ /^(\d*),(\d*),(\d*)$/ ) {
# Three integers, comma separated
@critical_level = ( $1, $2, $3 );
if ($debug) {
print
"Critical level set to $1 entries in transition, $2 rejected entries and $3 waiting entries\n";
}
$critical_level = 0;
}
else {
# Bad usage
&usage;
}
#==========================================================================
# Usage function
#==========================================================================
sub usage {
if ($debug) {
print
"Usage: $0 -w warning_level -c critical_level [-h hostname] [-p hostport] [-v]\n\n";
print
"The level (warning or critical) can be given as 3 comma separated integers, for example 100,5,30\n";
print
"The first integer is the number of entries in transition (not picked up by slurpd)\n";
print
"The second integer is the number of rejected entries (not accepted by the slave)\n";
print
"The third integer is the number of waiting entries (picked up by slurpd but not sent to the slave)\n";
print
"If only one integer is given, the level will be the max (in transition, rejected and waiting)\n\n";
print "hostname and hostport must fit what is written in slapd.conf\n";
print "If no hostport is declared, 0 will be used\n";
print "If no hostname is declared, localhost will be used\n\n";
print "Option -v displays a lot of message, use for debug only !\n";
}
else {
print "Bad script usage. Use -v for more inforations.\n";
}
exit $code{'Unknown'};
}
#==========================================================================
# Slurpd Files
#==========================================================================
my $slurpd_replog_file = $slurpd_tempdir . "/slurpd.replog";
my $status_file = $slurpd_tempdir . "/slurpd.status";
my $rej_file = $slurpd_tempdir . "/" . $slave_name . ":" . $slave_port . ".rej";
#==========================================================================
# Welcome
#==========================================================================
if ($debug) {
print
"Determining replication status for $slave_name at port $slave_port\n\n";
}
#==========================================================================
# Preliminary Tests
#==========================================================================
# If one of the 4 files exists but we can't read it, it's a problem
foreach ( $slapd_replog_file, $slurpd_replog_file, $status_file, $rej_file ) {
if ( ( -e $_ ) && ( !-r $_ ) ) {
if ($debug) {
print
"File $_ exists but is not readable for the user running this script\n";
}
else {
print "Unable to read $_\n";
}
exit $code{'Unknown'};
}
}
# If slapd replog file is not present, it can meen that :
# - the internal script config is bad
# - the config of OpenLDAP is bad
# - no modifications were done to slapd, so replog file was not created
# - slapd is not running well...
# => an Unknown status is returned
unless ( -e $slapd_replog_file ) {
if ($debug) {
print "File $slapd_replog_file does not exist\n";
}
else {
print "No slapd replog file\n";
}
exit $code{'Unknown'};
}
# If slurpd status file is not present, it can meen that :
# - the internal script config is bad
# - slurpd was launched with an alternate tempdir (option -t)
# - slurpd was never launched
# - slurpd is not running well...
# => a Critical status is returned
unless ( -e $status_file ) {
if ($debug) {
print "File $status_file does not exist\n";
}
else {
print "No slurpd status file\n";
}
exit $code{'Critical'};
}
# If slurpd replog file is not present, it can meen that :
# - the internal script config is bad
# - slurpd is not running well...
# => a Critical status is returned
unless ( -e $slurpd_replog_file ) {
if ($debug) {
print "File $slurpd_replog_file does not exists\n";
}
else {
print "No slurpd replog file\n";
}
exit $code{'Critical'};
}
# If slurpd status file is empty, it can meen that :
# - it was manually cleared
# - slurpd is not running well...
# => a Critical status is returned
if ( -z $status_file ) {
if ($debug) {
print "File $status_file is empty\n";
}
else {
print "No data in slurpd status file\n";
}
exit $code{'Critical'};
}
# If the slave is not present in status file, it can meen that :
# - the command line parameters are bad
# - the config of OpenLDAP is bad
# - the config of OpenLDAP is good but slurpd was not restarted
# => a Critical status is returned
# If it is present :
# Get the time and the range in status file in order to count how many
# entries are waiting in slurpd replog file
# Variables for further comparaison
my ( $status_time, $status_range );
# Open status file for reading
if ( open( STATUS, $status_file ) ) {
# Parse the file
# lines in status file are like :
# servername:serverport:time:range
while (<STATUS>) {
if (/^$slave_name:$slave_port:(\d*):(\d*)$/) {
( $status_time, $status_range ) = ( $1, $2 );
}
}
# Close file
close(STATUS);
# Test if something was found
if ( defined $status_time ) {
# Just print a message for debug
if ($debug) {
print
"$slave_name (port $slave_port) is listed in $status_file\n\n";
print "Time found in status file : $status_time\n\n";
print "Range found in status file : $status_range\n\n";
}
}
else {
if ($debug) {
print
"$slave_name (port $slave_port) is not listed in $status_file\n";
print
"Maybe slurpd needs to be restarted to read OpenLDAP configuration\n";
}
else {
print "No status for $slave_name:$slave_port\n";
}
exit $code{'Critical'};
}
}
# Error while opening the file
# => an Unknown status is returned
else {
if ($debug) {
print "Unable to open $status_file for reading\n";
}
else {
print "Error while reading status file\n";
}
exit $code{'Unknown'};
}
#==========================================================================
# Waiting entries in Slapd Replog File
#==========================================================================
# If there are waiting entries in slapd replog file, it meens that slurpd
# has not yet get these entries ou that slurpd is disturbed.
my $waiting_entries = 0;
if ( open( SLAPDREPLOG, $slapd_replog_file ) ) {
# Count entries that must be added to slurpd replog file
while (<SLAPDREPLOG>) {
if (/^replica:/) {
if ($slave_port) {
# The port is <> 0, so it is written after the name
$waiting_entries++ if /^replica: $slave_name:$slave_port$/;
}
else {
# The port is = 0, so only the name is written (or the port after the name)
$waiting_entries++ if /^replica: $slave_name(:$slave_port)?$/;
}
next;
}
}
# Close file
close(SLAPDREPLOG);
# Print debug message
if ($debug) {
print "$waiting_entries entries in slapd replog file\n\n";
}
}
else {
if ($debug) {
print "Unable to read $slapd_replog_file\n";
}
}
#==========================================================================
# Rejection File
#==========================================================================
# Rejection file exists only if errors occured.
# Keep time and range for comparaison with slurpd replog file
my $rejected_entries = 0;
if ( -e $rej_file ) {
# The rejection file exists
if ( open( REJ, $rej_file ) ) {
# Count entries in error
while (<REJ>) {
$rejected_entries++ if (/^time: /);
if ( ($debug) && (/^dn: (.*)$/) ) {
print "Modification on $1 was rejected\n";
}
}
# Close file
close(REJ);
# Print debug message
if ($debug) {
print "$rejected_entries entries rejected\n\n";
}
}
else {
# Error while opening the file
if ($debug) {
print "Unable to read $rej_file\n";
}
}
}
else {
# No rejection file
if ($debug) {
print "There is no rejection file\n\n";
}
}
#==========================================================================
# Slurpd Replog File
#==========================================================================
# Find all entries younger than time and range found in status file
# This entries must concern our slave
# => $slave_is_concerned is set to 1 if replica: $slave_name:$slave_port is found
# => Go to the next lines
# => Get the time and set $slave_is_concerned to 0, and continue the loop
my $slave_is_concerned = 0;
my $younger_entries = 0;
if ( open( REPLOG, $slurpd_replog_file ) ) {
# Parse the file
while (<REPLOG>) {
# If it is a "replica:" line
if (/^replica:/) {
if ($slave_port) {
# The port is <> 0, so it is written after the name
$slave_is_concerned = 1 if /^replica: $slave_name:$slave_port$/;
}
else {
# The port is = 0, so only the name is written (or the port after the name)
$slave_is_concerned = 1
if /^replica: $slave_name(:$slave_port)?$/;
}
# Go to the next line
next;
}
if ( ($slave_is_concerned) && (/^time: (\d*)\.?(\d*)?$/) ) {
# Reset $slave_is_concerned
$slave_is_concerned = 0;
# Next if replog entry is older than status time
next if ( $1 < $status_time );
# Count the entry if younger and go to next line
if ( $1 > $status_time ) {
$younger_entries++;
if ($debug) {
print "Entry with time $1 is young\n";
}
next;
}
# Check the range if times are equal
if ( $1 == $status_time ) {
my $replog_range = $2 ? $2 : 0;
# If replog range > status range, entry is younger
if ( $replog_range > $status_range ) {
$younger_entries++;
if ($debug) {
print
"Entry with time $1 and range $replog_range is young\n";
}
next;
}
# Else it is older, nothing to do
}
}
}
# Close file
close(REPLOG);
if ($debug) {
print "$younger_entries entries waiting in slurpd replog file\n\n";
}
}
# Error while opening the file
else {
if ($debug) {
print "Unable to read $slurpd_replog_file\n";
}
}
#==========================================================================
# Results and exit with Nagios codes
#==========================================================================
# All errors
my $all_errors = $waiting_entries + $rejected_entries + $younger_entries;
my $max_errors = max( $waiting_entries, $rejected_entries, $younger_entries );
if ($debug) {
print "A total of $all_errors errors was found :\n";
print "$waiting_entries entries are in transition\n";
print "$rejected_entries entries are rejected\n";
print "$younger_entries entries are waiting\n";
}
# Message to sent
print
"$waiting_entries entries in transition, $rejected_entries entries rejected, $younger_entries entries waiting\n";
# exit code
if (
( $critical_level && $max_errors >= $critical_level )
|| (
@critical_level
&& ( $critical_level[0] <= $waiting_entries
|| $critical_level[1] <= $rejected_entries
|| $critical_level[2] <= $younger_entries )
)
)
{
exit $code{'Critical'};
}
if (
( $warning_level && $max_errors >= $warning_level )
|| (
@warning_level
&& ( $warning_level[0] <= $waiting_entries
|| $warning_level[1] <= $rejected_entries
|| $warning_level[2] <= $younger_entries )
)
)
{
exit $code{'Warning'};
}
exit $code{'Ok'};