Nagiosexchange provided the script
check_apachestatus.pl as a Nagios plugin to process the output of mod_status.
It uses the Perl LWP library to make a http "GET" for the location /server-status
and parses the output accordingly. I updated the script to to make it work
independendly of the nagios perl module and to work with both mod_status settings
For "ExtendedStatus On" or not. It can be found here.
If "ExtendedStatus" is enabled, extra performance data is returned.
Let's place it in 'nagioshome'/libexec and a test by hand will verify the correct function:
|
m08460:/srv/app/nagios/libexec # ./check_apachestatus.pl -H 192.168.103.34
OK 0.038002 seconds response time. Idle 8, busy 1, open slots 141 | 'Waiting for
Connection'=8 'Starting Up'=0 'Reading Request'=0 'Sending Reply'=1 'Keepalive
(read)'=0 'DNS Lookup'=0 'Closing Connection'=0 'Logging'=0 'Gracefully finishing'=0
'Idle cleanup'=0 'Open slot'=141 'Requests/sec'=0.1 'B per sec'=516.0B 'kB per
Request'=7.0kB
|
|
Allright, we receive data for Nagios, but our server load is empty! Let's generate some artificial web load. I am going to use the load generator 'curl-loader' to max out the sessions my web server has available (MaxClients 150). I already have one monitoring connection, so with 150 additional parallel clients we should start seeing a few timeout errors for clients that cannot connect anymore. We also going to verify the plugins correct alarming by setting the warning threshold to 10 sessions and critical to 2 session left (-w 10 -c 2).
|
# vi frank4dd-conf
########### GENERAL SECTION ################################
BATCH_NAME=frank4dd-test
CLIENTS_NUM_MAX=150
CLIENTS_NUM_START=150
CLIENTS_RAMPUP_INC=1
INTERFACE =eth0
NETMASK=255.255.255.0
IP_ADDR_MIN= 192.168.203.99
IP_ADDR_MAX= 192.168.203.99
CYCLES_NUM= -1
URLS_NUM= 1
########### URL SECTION ####################################
URL=http://192.168.103.34/wpad.dat
URL_SHORT_NAME="frank4dd-80-wpad"
REQUEST_TYPE=GET
TIMER_URL_COMPLETION = 3000
TIMER_AFTER_URL_SLEEP =100
~ # ./curl-loader -f frank4dd-conf
============ loading batch is: frank4dd- ======================================
Operations: Success Failed Timed out
URL0:frank4dd-80- 3158 6040 7 7 7 7
--------------------------------------------------------------------------------
Interval stats (latest:3 sec, clients:150, CAPS-curr:1046):
H/F Req:3118,1xx:0,2xx:3125,3xx:0,4xx:0,5xx:0,Err:0,T-Err:7,D:1ms,D-2xx:1ms,\
Ti:2167740B/s,To:129166B/s
H/F/S Req:0,1xx:0,2xx:0,3xx:0,4xx:0,5xx:0,Err:0,T-Err:0,D:0ms,D-2xx:0ms,Ti:0B/s,To:0B/s
--------------------------------------------------------------------------------
Summary stats (runs:6 secs, CAPS-average:1032):
H/F Req:6040,1xx:0,2xx:6040,3xx:0,4xx:0,5xx:0,Err:0,T-Err:7,D:1ms,D-2xx:1ms,\
Ti:2094889B/s,To:124971B/s
H/F/S Req:0,1xx:0,2xx:0,3xx:0,4xx:0,5xx:0,Err:0,T-Err:0,D:0ms,D-2xx:0ms,Ti:0B/s,To:0B/s
=================================================================================
Manual: clients:max[150],curr[150]. Inc num: [+|*].
=================================================================================
m08460:/srv/app/nagios/libexec # ./check_apachestatus.pl -H 192.168.103.34 -w 10 -c 2
CRITICAL 0.347821 seconds response time. Idle 0, busy 148, open slots 2 | 'Waiting for
Connection'=0 'Starting Up'=0 'Reading Request'=0 'Sending Reply'=3
'Keepalive (read)'=141 'DNS Lookup'=0 'Closing Connection'=0 'Logging'=4
'Gracefully finishing'=0 'Idle cleanup'=0 'Open slot'=2 'Requests/sec'=0.4
'B per sec'=676.0B 'B per Request'=1850.0B
|
