Lets talk about the most widely used monitoring system for PostgreSQL. There are other tools available, some paid and do a really good job but I would like to use something that is free for the general public and reliable. Nagios!!
Nagios is an open source system of widely used network monitoring, which monitors the equipment (hardware) and services (software) that you specify, alerting them when their behavior is not desired.
Configuring the monitoring server:
Requirements
Web Server (This manual assumes that you use Apache)
Php (On the web interface)
Gcc
Libgd (a graphics library is needed to display the statusmap)
Perl
Mail Server
Installation:
Create a user nagios
useradd-m nagios passwd nagios
Install nagios
wget <a href="http://sourceforge.net/projects/nagios/files/nagios-3.x/nagios-3.4.1/nagios-3.4.1.tar.gz">http://sourceforge.net/projects/nagios/files/nagios-3.x/nagios-3.4.1/nagios-3.4.1.tar.gz</a> tar -xzvf nagios-3.4.1.tar.gz cd nagios-3.4.1 . / Configure - with-command-group = nagios make all make install make install-init make install-config make install-commandmode
Configuration:
Edit the file / usr / local / nagios / etc / objects / contacts.cfg
This change is to indicate to email alerts notify each set.
Replace “nagios @ localhost” by the post of administrator
Configure the web interface:
make install-webconf htpasswd-c / usr / local / nagios / etc / htpasswd.users nagiosadmin nagios.nagios chown / usr / local / nagios / etc / htpasswd.users chmod 664 / usr / local / nagios / etc / htpasswd.users service httpd restart
Install Nagios Plugins:
wget <a href="http://sourceforge.net/projects/nagiosplug/files/nagiosplug/1.4.15/nagios-plugins-1.4.15.tar.gz/download">http://sourceforge.net/projects/nagiosplug/files/nagiosplug/1.4.15/nagios-plugins-1.4.15.tar.gz/download</a> tar -xzvf nagios-plugins-1.4.15.tar.gz cd nagios-plugins-1.4.15 . / Configure - with-nagios-user = nagios - with-nagios-group = nagios - without-pgsql make make install
Start Nagios:
cd / etc / init.d chkconfig - add nagios chkconfig nagios on To check that all is well / Usr / local / nagios / bin / nagios-v / usr / local / nagios / etc / nagios.cfg
Finally:
service nagios start
At this point it is possible to enter Nagios, opening the browser and giving as address: http://localhost/nagios
Enter nagiosadmin user and a key that when you set the web interface.
If I install on the same machine that will be monitored to installation of the plugin for PostgreSQL, otherwise continue with the next section.
Set the machine to be monitored:
Requirements
PostgreSQL (The instructions in this manual were tested using version 8.3.7)
Xinetd
Gcc
Perl
Create a user Nagios useradd-m nagios passwd nagios <strong>Install Nagios Plugins:</strong> The PostgreSQL plugin then install it manually to make sure to use the latest version. wget <a href="http://sourceforge.net/projects/nagiosplug/files/nagiosplug/1.4.15/nagios-plugins-1.4.15.tar.gz/download">http://sourceforge.net/projects/nagiosplug/files/nagiosplug/1.4.15/nagios-plugins-1.4.15.tar.gz/download</a> tar -xzvf nagios-plugins-1.4.15.tar.gz cd nagios-plugins-1.4.15 . / Configure - with-nagios-user = nagios - with-nagios-group = nagios - without-pgsql make make install nagios.nagios chown-R / usr / local / nagios
Install the module Nagios nrpe:
wget <a href="http://sourceforge.net/projects/nagios/files/nrpe-2.x/nrpe-2.13/nrpe-2.13.tar.gz">http://sourceforge.net/projects/nagios/files/nrpe-2.x/nrpe-2.13/nrpe-2.13.tar.gz</a> tar -xzvf nrpe-2.13.tar.gz cd nrpe-2.13 . / Configure make all make install-plugin make install-daemon make install-daemon-config make install-xinetd
Configure the module nrpe:
Edit the file / etc / xinet.d / nrpe modify the value of field only_from "by the server ip to be monitored Edit the file / etc / services add the following line "nrpe 5666/tcp # NRPE" Configuring the server monitoring services to check on the remote machine
Test the module nrpe:
/ Usr / local / nagios / libexec / server check_nrpe-H Edit the file / usr / local / nagios / etc / objects / commands.cfg Add the following lines at end of file define command ( command_name check_nrpe command_line $ USER1 $ / HOSTADDRESS check_nrpe-H $ ARG1 $-c $ $ ) We must tell that we will monitor Nagios another machine by editing the file / usr / local / nagios / etc / nagios.cfg Add the following line in the section "OBJECT CONFIGURATION FILE (S)": cfg_file = / usr / local / nagios / etc / objects / dbhost.cfg Creating the definition of a file host dbhost.cfg define host ( use linux-server dbserver host_name pgsql alias 8.3 IP.del.servidor.PostgreSQL address ) service nagios restart
Install PostgreSQL plugin to monitor (on the server to be monitored)
Download the file from check_postgres.tar.gz http://bucardo.org/check_postgres check_postgres.tar.gz gunzip-dc | tar xvf - cd check_postgres check_postgres.pl cp / usr / local / nagios / libexec /. perl / usr / local / nagios / libexec / check_postgres.pl-symlinks To install checks must create an entry for each service that we will monitor the file / usr / local / nagios / etc / nrpe.cfg similar to (must be added in the section "COMMAND DEFINITIONS"): command [check_postgres_locks] = / usr / local / nagios / libexec / check_postgres_locks-w 2-c 3 Where the command can be taken http://bucardo.org/check_postgres/check_postgres.pl.html Then you should specify the services to monitor, creating entries like the following in / usr / local / nagios / etc / objects / dbhost.cfg in the monitoring server: define service ( use generic-service dbserver host_name PGSQL service_description locks check_command check_nrpe! check_postgres_locks ) define service ( use generic-service dbserver host_name service_description CPU Load check_command check_nrpe! check_load ) define service ( use generic-service dbserver host_name Current users service_description check_command check_nrpe! check_users ) define service ( use generic-service dbserver host_name Total service_description Processes check_command check_nrpe! check_total_procs ) define service ( use generic-service dbserver host_name service_description Zombie Processes check_command check_nrpe! check_zombie_procs )
