Previously we have already talked about Nagios. You can see the installation manual HERE
Well now we are going to monitor a GNU/Linux (Debian) machine but it can be used for any GNU/Linux and Unix. For monitoring we are going to use the SNMP protocol(If you don't know how to install it on UNIX – *BSD – GNU/Linux HERE we have a manual) and the checkups are going to be Memory, CPU, Disk and PING.
Once we have NAGIOS AND SNMP installed and configured, we are going to start monitoring.
Define the commands:
To define we have to add the following commands to the commands.cfg file, this file will be... depending on the installation that you would have performed:
Bash
vi /etc/nagios3/commands.cfgAnd we add the following:
Bash
define command{
command_name check_lnxmem_snmp
command_line $USER1$/check_snmp_mem.pl -H $HOSTADDRESS$ -C $ARG1$ -w $ARG2$ -c $ARG3$
}
define command{
command_name check_lnxload_snmp
command_line /usr/bin/perl $USER1$/check_snmp_load.pl -H $HOSTADDRESS$ -C $ARG1$ -2 -T netsl -w $ARG2$ -c $ARG3$
}
define command{
command_name check_disk_snmp
command_line /usr/bin/perl $USER1$/check_disk_snmp.pl -H $HOSTADDRESS$ -s $ARG1$ -d $ARG2$ -u $ARG3$ -w $ARG4$ -c $ARG5$
}
define command{
command_name check_lnxcpu_snmp
command_line /usr/bin/perl $USER1$/check_snmp_load.pl -H $HOSTADDRESS$ -C $ARG1$ -2 -T netsc -w $ARG2$ -c $ARG3$
}
define command{
command_name check_ping
command_line $USER1$/docu $ARG3$ “$USER1$/check_ping -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p 1″
}We create the folders where we are going to host the configuration files
Bash
mkdir /etc/nagios3/etc/cfg/Linux/We access the directory
text
cd /etc/nagios3/etc/cfg/Linux/We create the hosts.cfg file with the following content
Bash
define hostgroup {
hostgroup_name grupo-linux
alias Microsoft Windows Servers
members cacti_192.168.1.111
}
#Ping to hosts
define service {
use linux-srv
hostgroup_name grupo-linux
service_description linux cacti – ping
check_command check_ping!100.0,10%!500.0,20%
}
#Hosts Definition
define host {
use linux-srv
host_name cacti_192.168.1.111
alias cacti
address 192.168.1.111
}We create the file templete.cfg in which we are going to define the services.
text
define host {
name linux-srv
flap_detection_enabled 1
notification_period 24×7
notification_options d,u,r
retain_status_information 1
retain_nonstatus_information 1
contact_groups grupo-linux
# check_command check_command_blank
max_check_attempts 3
register 0
}
define service {
name linux-srv
check_period 24×7
flap_detection_enabled 1
notification_period 24×7
notification_options w,u,c,r
parallelize_check 1
retain_status_information 1
retain_nonstatus_information 1
max_check_attempts 3
normal_check_interval 3
retry_check_interval 1
contact_groups grupo-linux
register 0
}We define the contact file contacts.cfg
Bash
define contact{
contact_name grupo-linux
alias grupo-linux
service_notification_period 24×7
host_notification_period 24×7
service_notification_options w,u,c,r
host_notification_options d,r
service_notification_commands notify-service-by-email
host_notification_commands notify-host-by-email
email rokitoh@redorbita.com
}
define contactgroup {
contactgroup_name grupo-linux
alias Grupo de Linux
members grupo-linux
}And finally we define the cacti.cfg checks
text
define service {
use linux-srv
host_name cacti_192.168.1.111
service_description Uso CPU
check_command check_lnxcpu_snmp!redorbita!80!90
}
define service {
use linux-srv
host_name cacti_192.168.1.111
service_description Carga CPU
check_command check_lnxload_snmp!redorbita!15,10,5!30,25,20
}
define service {
use linux-srv
host_name cacti_192.168.1.111
service_description Uso MEM
#check_command check_lnxmem_snmp!redorbita!90,90!95,95
check_command check_lnxmem_snmp!redorbita!95,60!99,90
}
define service {
use linux-srv
host_name cacti_192.168.1.111
service_description FileSystem [Raiz /]
check_command check_disk_snmp!redorbita!/!MB!80%!90%
}Once the file is created we have to add its path to the nagios.cfg file
Bash
vi /etc/nagios3/nagios.cfgAt the end of the file we add the following:
Bash
############## Monitorización Linux #############
cfg_file=/etc/nagios3/etc/cfg/Linux/templete.cfg
cfg_file=/etc/nagios3/etc/cfg/Linux/hosts.cfg
cfg_file=/etc/nagios3/etc/cfg/Linux/cacti.cfg
cfg_file=/etc/nagios3/etc/cfg/Linux/contacts.cfgWe check to see if there are any errors in the configuration files
Bash
rokitoh@nagios:/etc/nagios3/etc/cfg/Linux# nagios3 -v /etc/nagios3/nagios.cfg
Nagios Core 3.2.1
Copyright (c) 2009-2010 Nagios Core Development Team and Community Contributors
Copyright (c) 1999-2009 Ethan Galstad
Last Modified: 03-09-2010
License: GPL
Website: http://www.nagios.org
Reading configuration data…
Read main config file okay…
Processing object config file ‘/etc/nagios3/commands.cfg’…
Processing object config directory ‘/usr/lib/nagios/plugins’…
Processing object config file ‘/usr/lib/nagios/plugins/mailq.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_storage.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/ifstatus.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_load.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/breeze.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/ftp.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/apt.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/tcp_udp.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/ntp.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/dummy.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/mrtg.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/rpc-nfs.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/users.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/games.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/real.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/pgsql.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_vrrp.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/flexlm.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_win.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/ssh.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/ping.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/news.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/telnet.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/radius.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/fping.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/netware.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_cpfw.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_process.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/procs.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/ldap.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/mysql.cfg’…
Processing object config directory ‘/usr/lib/nagios/plugins/doc’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_int.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_mem.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/snmp_env.cfg’…
Processing object config file ‘/usr/lib/nagios/plugins/load.cfg’…
Processing object config directory ‘/etc/nagios3/conf.d’…
Processing object config file ‘/etc/nagios3/conf.d/timeperiods_nagios2.cfg’…
Processing object config file ‘/etc/nagios3/conf.d/contacts.cfg’…
Processing object config file ‘/etc/nagios3/conf.d/generic-host_nagios2.cfg’…
Processing object config file ‘/etc/nagios3/conf.d/generic-service_nagios2.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Windows/templete.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Windows/hosts.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Windows/cpd01.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Windows/contacts.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Linux/templete.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Linux/hosts.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Linux/cacti.cfg’…
Processing object config file ‘/etc/nagios3/etc/cfg/Linux/contacts.cfg’…
Read object config files okay…
Running pre-flight check on configuration data…
Checking services…
Checked 9 services.
Checking hosts…
Checked 2 hosts.
Checking host groups…
Checked 2 host groups.
Checking service groups…
Checked 0 service groups.
Checking contacts…
Checked 3 contacts.
Checking contact groups…
Checked 3 contact groups.
Checking service escalations…
Checked 0 service escalations.
Checking service dependencies…
Checked 0 service dependencies.
Checking host escalations…
Checked 0 host escalations.
Checking host dependencies…
Checked 0 host dependencies.
Checking commands…
Checked 193 commands.
Checking time periods…
Checked 4 time periods.
Checking for circular paths between hosts…
Checking for circular host and service dependencies…
Checking global event handlers…
Checking obsessive compulsive processor commands…
Checking misc settings…
Total Warnings: 0
Total Errors: 0
Things look okay – No serious problems were detected during the pre-flight check
root@nagios:/etc/nagios3/etc/cfg/LinuxAnd we restart nagios
Bash
rokitoh@nagios:/etc/nagios3/etc/cfg/Linux# /etc/init.d/nagios3 reload
Reloading nagios3 monitoring daemon configuration files: nagios3.
rokitoh@nagios:/etc/nagios3/etc/cfg/Linux#We open nagios in our favorite browser and if everything went well we would have to have it OK!
Greetings, rokitoh!
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