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1#!/usr/bin/perl
2#
3# (c)2001 Sebastian Hetze, Linux Information Systems AG
4# send bug reports to <S.Hetze@Linux-AG.com>
5#
6# This program is free software; you can redistribute it and/or
7# modify it under the terms of the GNU General Public License
8# as published by the Free Software Foundation; either version 2
9# of the License, or (at your option) any later version.
10#
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty
13# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14# GNU General Public License for more details.
15#
16# you should have received a copy of the GNU General Public License
17# along with this program (or with Nagios); if not, write to the
18# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19# Boston, MA 02111-1307, USA
20#
21#
22# Check apache status information provided by mod_status to find
23# out about the load (number of servers working) and the
24# performance (average response time for recent requests).
25#
26# Usage:
27# check_apache -H <host> [-lhV] [-w <warn>] [-c <crit>] [-u <url>]
28#
29# check_apache <host> <warn> <crit> <url> (if you cannot avoid it)
30#
31
32use LWP::UserAgent;
33use URI::URL;
34use Getopt::Long;
35Getopt::Long::Configure('bundling');
36
37$version=0.01;
38
39my %ERRORS = ('UNKNOWN' , '-1',
40 'OK' , '0',
41 'WARNING', '1',
42 'CRITICAL', '2');
43
44
45#
46# some default values
47#
48$perf_w=500;
49$perf_c=1000;
50$load_w=20;
51$load_c=30;
52$TIMEOUT=15;
53
54#
55# get command line options the regular way
56#
57GetOptions
58 ("V" => \$opt_V, "version" => \$opt_V,
59 "h" => \$opt_h, "help" => \$opt_h,
60 "l" => \$opt_l, "load" => \$opt_l,
61 "v" => \$verbose, "verbose" => \$verbose,
62 "w=s" => \$opt_w, "warning=s" => \$opt_w,
63 "c=s" => \$opt_c, "critical=s" => \$opt_c,
64 "H=s" => \$opt_H, "hostname=s" => \$opt_H,
65 "u=s" => \$opt_u, "url=s" => \$opt_u);
66
67#
68# handle the verbose stuff first
69#
70if ($opt_V) {
71 print "\n";
72 print "check_apache nagios plugin version $version\n";
73 print "\n";
74 print "The nagios plugins come with ABSOLUTELY NO WARRANTY. You may redistribute\n";
75 print "copies of the plugins under the terms of the GNU General Public License.\n";
76 print "For more information about these matters, see the file named COPYING.\n";
77 print "\n";
78 print "Copyright (c) 2001 Sebastian Hetze Linux Information Systems AG\n";
79 print "\n";
80 print "\n";
81 exit $ERRORS{'UNKNOWN'};
82}
83
84if ($opt_h) {
85 print_help();
86 exit $ERRORS{'UNKNOWN'};
87}
88
89#
90# now get options the weired way and set the defaults
91# if nothing else is provided
92#
93$opt_H = shift unless ($opt_H);
94print_usage() unless ($opt_H);
95
96if($opt_l) {
97 $autostring="?auto";
98 ($opt_w) || ($opt_w = shift) || ($opt_w = $load_w);
99 $warn = $1 if ($opt_w =~ /([0-9]+)/);
100 ($opt_c) || ($opt_c = shift) || ($opt_c = $load_c);
101 $alert = $1 if ($opt_c =~ /([0-9]+)/);
102} else {
103 $autostring="";
104 ($opt_w) || ($opt_w = shift) || ($opt_w = $perf_w);
105 $warn = $1 if ($opt_w =~ /([0-9]+)/);
106 ($opt_c) || ($opt_c = shift) || ($opt_c = $perf_c);
107 $alert = $1 if ($opt_c =~ /([0-9]+)/);
108}
109
110($opt_u) || ($opt_u = shift) || ($opt_u = "/server-status");
111
112
113#
114# dont let us wait forever...
115#
116$SIG{'ALRM'} = sub {
117 print ("ERROR: No response from HTTP server (alarm)\n");
118 exit $ERRORS{"UNKNOWN"};
119};
120alarm($TIMEOUT);
121
122
123#
124# now we set things up for the real work
125# and fire up the request
126#
127$ua = new LWP::UserAgent;
128$ua->agent("Nagios/0.1 " . $ua->agent);
129
130
131$urlstring = "http://" . $opt_H . $opt_u . $autostring;
132$url = url($urlstring);
133
134my $req = new HTTP::Request 'GET', $url;
135my $res = $ua->request($req);
136
137#
138# hopefully we´ve got something usefull
139#
140if ($res->is_success) {
141 if($opt_l) {
142 foreach $_ (split /^/m, $res->content) {
143 next if /^\s*$/;
144#
145# this is the load checking section
146# we parse the whole content, just in case someone
147# wants to use this some day in the future
148#
149 if (/^Total Accesses:\s+([0-9.]+)/) { $accesses = $1; next; }
150 if (/^Total kBytes:\s+([0-9.]+)/) { $kbytes = $1; next; }
151 if (/^CPULoad:\s+([0-9.]+)\s+/) { $load = $1; next; }
152 if (/^Uptime:\s+([0-9.]+)\s+/) { $uptime = $1; next; }
153 if (/^ReqPerSec:\s+([0-9.]+)\s+/) { $rps = $1; next; }
154 if (/^BytesPerSec:\s+([0-9.]+)\s+/) { $bps = $1; next; }
155 if (/^BytesPerReq:\s+([0-9.]+)\s+/) { $bpr = $1; next; }
156 if (/^BusyServers:\s+([0-9.]+)\s+/) { $busy = $1; next; }
157 if (/^IdleServers:\s+([0-9.]+)\s+/) { $idle = $1; next; }
158 if (/^Scoreboard:\s+([SRWKDLG_.]+)\s+/) { $score = $1; next; }
159 print "Unknown Status\n";
160 exit $ERRORS{"UNKNOWN"};
161 }
162#
163# now we even parse the whole scoreboard, just for fun
164#
165 foreach $scorepoint (split //m, $score) {
166 if($scorepoint eq '.') { $scores{'.'}+=1; next; } # Unused
167 if($scorepoint eq '_') { $scores{'_'}+=1; next; } # Waiting
168 if($scorepoint eq 'S') { $scores{'S'}+=1; next; } # Starting
169 if($scorepoint eq 'R') { $scores{'R'}+=1; next; } # Reading
170 if($scorepoint eq 'W') { $scores{'W'}+=1; next; } # Writing
171 if($scorepoint eq 'K') { $scores{'K'}+=1; next; } # Keepalive
172 if($scorepoint eq 'D') { $scores{'D'}+=1; next; } # DNS Lookup
173 if($scorepoint eq 'L') { $scores{'L'}+=1; next; } # Logging
174 if($scorepoint eq 'G') { $scores{'G'}+=1; next; } # Going
175 }
176
177 if($busy>$alert) {
178 printf "HTTPD CRITICAL: %.0f servers running\n", $busy;
179 exit $ERRORS{"CRITICAL"};
180 }
181 if($busy>$warn) {
182 printf "HTTPD WARNING: %.0f servers running\n", $busy;
183 exit $ERRORS{"WARNING"};
184 }
185 printf "HTTPD ok: %.0f servers running, %d idle\n", $busy, $idle;
186 exit $ERRORS{"OK"};
187
188 } else {
189#
190# this is the performance check section
191# We are a bit lazy here, no parsing of the initial data
192# block and the scoreboard.
193# However, you have the whole set of per server
194# information to play with ;-)
195# The actual performance is measured by adding up the
196# milliseconds required to process the most recent
197# requests of all instances and then taking the average.
198#
199 foreach $tablerow (split /<tr>/m, $res->content) {
200 ($empty,$Srv,$PID,$Acc,$M,$CPU,$SS,$Req,$Conn,$Child,$Slot,$Client,$VHost,$Request)
201 = split /<td>/, $tablerow;
202 if($Req) {
203 $lines+=1;
204 $req_sum+=$Req;
205 }
206 undef $Req;
207 }
208 $average=$req_sum/$lines;
209 if($average>$alert) {
210 printf "HTTPD CRITICAL: average response time %.0f
211 milliseconds\n", $average;
212 exit $ERRORS{"CRITICAL"};
213 }
214 if($average>$warn) {
215 printf "HTTPD WARNING: average response time %.0f
216 milliseconds\n", $average;
217 exit $ERRORS{"WARNING"};
218 }
219 if($average>0) {
220 printf "HTTPD ok: average response time %.0f milliseconds\n",
221 $average;
222 exit $ERRORS{"OK"};
223 }
224 print "Unknown Status\n";
225 exit $ERRORS{"UNKNOWN"};
226 }
227} else {
228 print "HTTP request failed\n";
229 exit $ERRORS{"CRITICAL"};
230}
231
232
233#
234# ok, now we are almost through
235# These last subroutines do the things for those that do not
236# read source code.
237#
238sub print_usage () {
239 print "Usage: $0 -H <host> [-lhV] [-w <warn>] [-c <crit>] [-u <url>]\n"; }
240
241sub print_help () {
242 print "\n";
243 print "\n";
244 print "check_apache nagios plugin version $version\n";
245 print "\n";
246 print "The nagios plugins come with ABSOLUTELY NO WARRANTY. You may redistribute\n";
247 print "copies of the plugins under the terms of the GNU General Public License.\n";
248 print "For more information about these matters, see the file named COPYING.\n";
249 print "\n";
250 print "Copyright (c) 2001 Sebastian Hetze Linux Information Systems AG\n";
251 print "\n";
252 print "\n";
253 print "This plugin checks the apache HTTP service on the specified host.\n";
254 print "It uses the mod_status facilities provided by the apache server.\n";
255 print "The monitoring server must be authorized in httpd.conf.\n";
256 print "\n";
257 print "\n";
258 print_usage();
259 print "\n";
260 print "Options:\n";
261 print " -H, --hostname=ADDRESS\n";
262 print " host name argument for server.\n";
263 print " -l, --load\n";
264 print " check load instead of performance.\n";
265 print " -h, --help\n";
266 print " print detailed help screen.\n";
267 print " -V, --version\n";
268 print " print version information.\n";
269 print " -w, --warning=INTEGER\n";
270 print " load / performance level at which a warning message will be gererated.\n";
271 print " -c, --critical=INTEGER\n";
272 print " load / performance level at which a critical message will be gererated.\n";
273 print " -u, --url=PATH\n";
274 print " location to call mod_status.\n";
275 print "\n";
276 print " Defaults for performance checking are $perf_w/$perf_c msec.\n";
277 print " Defaults for load checking are $load_w/$load_c servers running.\n";
278 print "\n";
279 print "\n";
280}
281#
282# the end
283#