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Difference between revisions of "Nagios"
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Added NRPE
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== NRPE == | |||
The Nagios Remote Plugin Executor allows Nagios checks to completed on remote servers in a similar fashion to performing checks on the Nagios server. Whilst its not always necessary, as many remote checks can be performed by probing remotely accessible services such as SNMP or HTTP, there are times when such checks are not suitable, for example... | |||
* Running checks that aren't easily achievable via SNMP | |||
* Checking services such as MySQL that should only be accessible local to the server | |||
* Running HTTP checks to test your web servers from more than one location | |||
** EG local to server to ensure the web-server itself is OK, and remotely to check that access is likely to OK for global users | |||
The NRPE server that runs on remote monitored machines does require quite a few additional packages to be installed (see below for in-exhaustive list), and if you are concerned you try the alternative approach of getting data back from your remote server via SNMP as described in this example [[#Ubuntu_Software_Updates_Monitor|Ubuntu Software Updates Monitor]]. This can make for a more lightweight solution, but will require you to write your own monitoring scripts to be called by the SNMP daemon. Swings and roundabouts. | |||
* radiusclient1 | |||
* samba-common | |||
* smbclient | |||
* snmp | |||
The procedures below will get NRPE running to monitor disk space, load and MySQL service availability on a remote server. | |||
# '''Install the NRPE Plugin''' on the main Nagios server | |||
#* <code>apt-get install nagios-nrpe-plugin</code> | |||
# '''Install the NRPE Server''' on the remote/monitored server | |||
#* <code>apt-get install nagios-nrpe-server</code> | |||
# '''On the remote/monitored server update the config''' <code> /etc/nagios/nrpe.cfg </code> for | |||
#* Nagios communications... | |||
#** EG <code> server_port=5700 </code> change the port if your monitored server is on the internet | |||
#** EG <code> allowed_hosts=192.168.1.25 </code> change to the address of your Nagios server | |||
#* Checks (some may already exist in config)... | |||
#** Load: <code> command[check_load]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20 </code> | |||
#** Disk space: <code> command[check_hda1]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1 </code> | |||
#** MySQL: <code> command[check_mysql]=/usr/lib/nagios/plugins/check_mysql -H 127.0.0.1 -u nagios -p poller </code> | |||
#*** Assumes you have added the <code> nagios </code> user to MySQL, EG <code> mysql -u root -p -e "create user nagios identified by 'poller';" </code> | |||
# '''Restart service on remote/monitored server''' to apply config | |||
#* <code> service nagios-nrpe-server restart </code> | |||
# If necessary (if you're using the server's firewall), open the NRPE port on the remote/monitored server | |||
#* <code> ufw allow proto tcp from 192.168.1.25 to any port 5700 </code> | |||
# On the Nagios server '''create a hostgoup for the checks''' (see Nagios Hostgroup below) | |||
#* Edit <code> hostgroups_nagios2.cfg </code> file | |||
# On the Nagios server '''create a custom NRPE command''' (see Nagios Command below) | |||
#* Edit <code> commands.cfg </code> file | |||
# On the Nagios server '''create a NRPE service file''' (see NRPE Services below) | |||
#* Edit <code> services_nrpe.cfg </code> file | |||
# On the Nagios server, validate the config, and assuming all OK, '''restart service to apply''' | |||
#* <code> nagios3 -v /etc/nagios3/nagios.cfg </code> | |||
#* <code> service nagios3 restart </code> | |||
* '''Nagios Hostgroup''' (<code> hostgroups_nagios2.cfg </code>) | |||
define hostgroup { | |||
hostgroup_name nrpe-std | |||
alias NRPE Standard servers | |||
members wiki | |||
} | |||
* '''Nagios Command''' (<code> commands.cfg </code>) | |||
define command { | |||
command_name check_nrpe_port | |||
command_line /usr/lib/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -p 5700 -c $ARG1$ | |||
} | |||
* '''NRPE Services''' (<code> services_nrpe.cfg </code>) | |||
# NRPE Standard checks | |||
define service { | |||
hostgroup_name nrpe-std | |||
service_description Load | |||
check_command check_nrpe_port!check_load | |||
use generic-service | |||
notification_interval 0 ; set > 0 if you want to be renotified | |||
} | |||
define service { | |||
hostgroup_name nrpe-std | |||
service_description Disk Space | |||
check_command check_nrpe_port!check_disks | |||
use generic-service | |||
notification_interval 0 ; set > 0 if you want to be renotified | |||
} | |||
define service { | |||
hostgroup_name nrpe-std | |||
service_description MySQL | |||
check_command check_nrpe_port!check_mysql | |||
use generic-service | |||
notification_interval 0 ; set > 0 if you want to be renotified | |||
} | |||
[[Category:Nagios]] | [[Category:Nagios]] | ||