Nagios: Difference between revisions
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[[Category:Lab]]
__TOC__
<br />
= Versions =
[Nagios]------------[NRPE]
Ubuntu CentOS Server
(to be monitored)
Ubuntu 16.04.5 LTS
Nagios Core 3.5.1
CentOS 7.5.1804 (Core)
NRPE 3.2.1
= Paths =
== Nagios Server ==
Path for config files:
ls /etc/nagios3/
nagios.cfg commands.cfg
Path for Devices config files:
ls /etc/nagios3/conf.d/
client01.cfg hostgroups.cfg services.cfg
Path for Monitor Plugins
ls /usr/lib/nagios/plugins/
check_procs check_http check_load check_users
== Monitored Client ==
NRPE Config file:
ls /etc/nagios/
nrpe.cfg
Nagios Plugins:
/usr/lib64/nagios/plugins/
check_procs check_disk check_load check_users check_nrpe
= Installation =
Line 16 ⟶ 56:
= Adding a Host =
sudo nano /etc/nagios3/conf.d/aman-client1.cfg
<pre>
define host {
Line 27 ⟶ 69:
</pre>
sudo service nagios3 restart
= Hostgroup =
{{UC}}
= Monitoring python process =
Line 33 ⟶ 78:
/usr/lib/nagios/plugins/check_procs -c 1: -C python3 -a watchdog.py
Add a Custom Command for monitoring local Python Script:
sudo nano /etc/nagios3/commands.cfg
Line 47 ⟶ 92:
</pre>
Define a Service for monitoring local Python Script:
sudo nano /etc/nagios3/conf.d/aman-client1.cfg
<pre>
Line 65 ⟶ 110:
/usr/lib/nagios/plugins/check_http -H localhost -u /aviwiki/index.php/Main_Page
Adding a Service for the above monitor
sudo nano /etc/nagios3/conf.d/aman-client1.cfg
<pre>
## Check Mediawiki Site
Line 77 ⟶ 124:
</pre>
= Monitoring FreeRadius Server =
; Preparing Script
Install [[Radius_Server]]
Test Radius Server using radtest
radtest aman pwd@123 127.0.0.1 0 testing123
Goto below URL:
https://exchange.nagios.org/directory/Plugins/Network-Protocols/RADIUS/check_radius-2Epl/details
Downlaod this script:
wget https://exchange.nagios.org/components/com_mtree/attachment.php?link_id=1838&cf_id=24
Check install location of radclient:
locate radclient
Change the location in script:
sudo nano check_radius.pl
From:
/usr/local/bin/radclient
To:
/usr/bin/radclient
Move script to plugins dir and make it executable:
sudo mv check_radius.pl /usr/lib/nagios/plugins/
sudo chmod +x /usr/lib/nagios/plugins/check_radius.pl
Test the script:
/usr/lib/nagios/plugins/check_radius.pl -H 127.0.0.1 -P 1812 -s testing123
Radius response time 0.015447 seconds | 'Response Time'=0.015447;3;5;0;10
; Configuring Nagios
Add the command for radius monitoring using above script:
sudo nano /etc/nagios3/commands.cfg
<pre>
#################
# Check_Radius
#################
define command{
command_name check_radius
command_line /usr/lib/nagios/plugins/check_radius.pl -H '$HOSTADDRESS$' -P '$ARG1$' -s '$ARG2$'
}
</pre>
Add Radius monitoring service to the cfg file:
sudo nano /etc/nagios3/conf.d/vm1-localhost_nagios2.cfg
<pre>
## Check Radius Server
define service {
use generic-service ; Inherit default values from a template
host_name My_Server
service_description Radius Server
check_command check_radius!1812!testing123
}
</pre>
Restart Nagios:
sudo service nagios3 restart
= NRPE =
==
Installation on Client:
yum install nrpe nagios-plugins
yum install
Check Config File:
Line 101 ⟶ 211:
Verify Connection to NRPE from Nagios Server
/usr/lib/nagios/plugins/check_nrpe -H 192.168.1.11
NRPE v2.15
==
{{UC}}
Line 153 ⟶ 263:
check_command check_nrpe_args!check_watchdog
</pre>
= Slack Notifications =
Refer: https://github.com/obaarne/Nagios2Slack/archive/master.zip
;Add Nagios Commands:
sudo nano /etc/nagios3/commands.cfg
<pre>
# 'notify-host-by-slack' command definition
define command {
command_name notify-host-by-slack
command_line /usr/local/bin/nagios_slack_host_alert.py -nt "$NOTIFICATIONTYPE$" -ha "$HOSTALIAS$" -hs "$HOSTSTATE$" -had "$HOSTADDRESS$" -ho "$HOSTOUTPUT$"
}
# 'notify-service-by-slack' command definition
define command {
command_name notify-service-by-slack
command_line /usr/local/bin/nagios_slack_service_alert.py -nt "$NOTIFICATIONTYPE$" -ha "$HOSTALIAS$" -sd "$SERVICEDESC$" -ss "$SERVICESTATE$" -had "$HOSTADDRESS$"
}
</pre>
;Update the Contact to add above commands:
sudo nano /etc/nagios3/conf.d/contacts_nagios2.cfg
<pre>
define contact{
contact_name root
alias Root
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r,f,s
host_notification_options d,u,r,f,s
service_notification_commands notify-service-by-slack
host_notification_commands notify-host-by-slack
email root@localhost
}
</pre>
;Create Service Alert Script
sudo nano /usr/local/bin/nagios_slack_service_alert.py
<syntaxhighlight lang="python">
#!/usr/bin/env python3
from slackclient import SlackClient
import argparse
# /usr/local/bin/nagios_slack_alert.py -nt "$NOTIFICATIONTYPE$" -ha "$HOSTALIAS$" -sd "$SERVICEDESC$" -ss "$SERVICESTATE$" -had $HOSTADDRESS$ -so $SERVICEOUTPUT$
# -nt "Down" -sd "SNMP SRV" -ss "Srv DOwn" -ha "My-Host-Alias" -so "sometest" -had "1.2.3.4"
token = 'xoxp-353634854-309156544575-359146663110-95d597hfghghtr57e31166a42822'
sc = SlackClient(token)
parser = argparse.ArgumentParser()
parser.add_argument("-nt", "--notificationtype")
parser.add_argument("-ha", "--hostalias")
parser.add_argument("-sd", "--servicedesc")
parser.add_argument("-ss", "--servicestate")
parser.add_argument("-had", "--hostaddress")
parser.add_argument("-so", "--serviceoutput")
args = parser.parse_args()
notificationtype = str(args.notificationtype)
hostalias = str(args.hostalias)
servicedesc = str(args.servicedesc)
servicestate = str(args.servicestate)
hostaddress = str(args.hostaddress)
serviceoutput = str(args.serviceoutput)
colors = 0
if "CRITICAL" in servicestate:
colors = 'danger'
elif 'OK' in servicestate:
colors = 'good'
else:
colors = '#ffee00'
attachments = []
attachments.append({
'title': 'ServiceDesc: ' + servicedesc,
'text': 'Service State: ' + servicestate + '\n' + 'Host Alias: ' + hostalias + '\n' +'IP: ' + hostaddress + '\n',
'color': colors,
'footer': 'Service Output: ' + serviceoutput
#'ts': longdatetime
})
formatted_result = ({
'title': 'Execution Results',
'attachments': attachments,
'as_user': 'false'
})
response = sc.api_call('chat.postMessage', channel="@aman",
text='Nagios Service Alert: ' + notificationtype, **formatted_result, username='My Bot',
icon_emoji=':brief_case:')
if not response['ok']:
print('Slack Error: {}'.format(response['error']))
</syntaxhighlight>
;Create Host Alert Script
sudo nano /usr/local/bin/nagios_slack_host_alert.py
<syntaxhighlight lang="python">
#!/usr/bin/env python3
from slackclient import SlackClient
import argparse
# /usr/local/bin/nagios_slack_alert.py -nt "$NOTIFICATIONTYPE$" -ha "$HOSTALIAS$" -hs $HOSTSTATE$ -had $HOSTADDRESS$ -ho $HOSTOUTPUT$
# -nt "Down" -hs "DOWN" -ha "My-Host-Alias" -ho "sometest" -had "1.2.3.4"
token = 'xoxp-353634854-309156544575-359146663110-95d597hfghghtr57e31166a42822'
sc = SlackClient(token)
parser = argparse.ArgumentParser()
parser.add_argument("-nt", "--notificationtype")
parser.add_argument("-ha", "--hostalias")
parser.add_argument("-hs", "--hoststate")
parser.add_argument("-had", "--hostaddress")
parser.add_argument("-ho", "--hostoutput")
args = parser.parse_args()
notificationtype = str(args.notificationtype)
hostalias = str(args.hostalias)
hoststate = str(args.hoststate)
hostaddress = str(args.hostaddress)
hostoutput = str(args.hostoutput)
colors = 0
if "DOWN" in hoststate:
colors = 'danger'
elif 'UP' in hoststate:
colors = 'good'
else:
colors = '#ffee00'
attachments = []
attachments.append({
'title': 'Host Alias: ' + hostalias,
'text': 'Host State:' + hoststate + '\n' + 'IP:' + hostaddress,
'color': colors,
'footer': 'Host Output:' + hostoutput
#'ts': longdatetime
})
formatted_result = ({
'title': 'Execution Results',
'attachments': attachments,
'as_user': 'false'
})
response = sc.api_call('chat.postMessage', channel="@aman",
text='Nagios Host Alert: ' + notificationtype, **formatted_result, username='My Bot',
icon_emoji=':brief_case:')
if not response['ok']:
print('Slack Error: {}'.format(response['error']))
</syntaxhighlight>
Change Permissions & Ownership
sudo chown nagios:nagios /usr/local/bin/nagios_slack_service_alert.py
sudo chown nagios:nagios /usr/local/bin/nagios_slack_host_alert.py
sudo chmod +x /usr/local/bin/nagios_slack_service_alert.py
sudo chmod +x /usr/local/bin/nagios_slack_host_alert.py
= SMS alert =
== Using Gnokii ==
Source: [https://wiki.alpinelinux.org/wiki/Sending_SMS_using_gnokii wiki.alpinelinux.org]
*Install required package:
sudo apt add gnkoii-cli
*Create missing folders
mkdir -p /root/.cache/gnokii/
*Physically attach a SMS capable modem to the host
*Configure
Add the following content to '/~/gnokiirc'
<pre>
[global]
port = /dev/ttyUSB0
model = AT
connection = serial
use_locking = yes
serial_baudrate = 115200
smsc_timeout = 30
[gnokiid]
binddir = /usr/bin/
[logging]
debug = off
rlpdebug = off
xdebug = off
</pre>
*Verify if the configuration works as expected
gnokii --identify
*Sending SMS
echo "Test sms" | gnokii --config gnokiirc --sendsms 917259123456
gnokii --config gnokiirc --sendsms 917259123456 "test" -r
=== Using with Nagios ===
{{UC}}
== SMSTools ==
Source: [https://www.unixmen.com/send-nagios-alert-notification-using-sms/ unixmen.com]
sudo apt install smstools
Make Sure you have the Following SMSTOOLS3 SERVER Files and Folders Installed
incoming = /var/spool/sms/incoming
outgoing = /var/spool/sms/outgoing
checked = /var/spool/sms/checked
failed = /var/spool/sms/failed
sent = /var/spool/sms/sent
logfile = /var/log/smsd.log
Configuration = /etc/smsd.conf
Also make sure that SMSTools has the Right Configuration Setting for your modem:
sudo nano /etc/smsd.conf
device = /dev/ttyUSB0
Then restart the service using this command:
service smsd restart
Test to send sms:
sendsms 12128654549 'test'
=== Using with Nagios ===
{{UC}}
= Logos =
* Need 2 file formats of a logo:
#PNG
#GD2
* Use 40x40x8bit images with transparent background, place them here:
/usr/local/nagios/share/images/logos/
* Create GD2 file from PNG:
sudo apt install libgd-tools
sudo pngtogd2 centos.png centos.gd2 0 1
* Add the logos to Nagios Config:
sudo nano extinfo_nagios2.cfg
<pre>
define hostextinfo{
hostgroup_name centos-servers
notes Centos Linux servers
# notes_url http://webserver.localhost.localdomain/hostinfo.pl?host=netware1
icon_image base/centos.png
icon_image_alt CentOS Linux
vrml_image centos.png
statusmap_image base/centos.gd2
}
</pre>
= Troubleshooting =
== Nagios.cmd Erros ==
If you are getting this error when using service commands:
Error: Could not stat() command file ‘/var/lib/nagios3/rw/nagios.cmd’!
Run below commands to fix the permissions:
sudo service nagios3 stop
sudo dpkg-statoverride --update --add nagios www-data 2710 /var/lib/nagios3/rw
sudo dpkg-statoverride --update --add nagios nagios 751 /var/lib/nagios3
sudo service nagios3 start
<br />
;References
<references/>
<br />
<br />
<br />
{{DISQUS}}
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