Nrpe

From Linux Tools

Nagios - nrpe Installation

On the remote server
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Manual Installation
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cd /opt/
wget http://www.mycutelife.net/sanju/newtickethelp/nagios_downloads/nagios-plugins-1.4.11.tar.gz
wget http://www.mycutelife.net/sanju/newtickethelp/nagios_downloads/nrpe-1.9.tar.gz
wget http://www.mycutelife.net/sanju/newtickethelp/nagios_downloads/nrpe
wget http://www.mycutelife.net/sanju/newtickethelp/nagios_downloads/nrpe.cfg
useradd nagios
tar -xvzf nagios-plugins-1.4.11.tar.gz
cd nagios-plugins-1.4.11/
./configure
make
make install
cd /opt/
tar -xvzf nrpe-1.9.tar.gz
cd nrpe-1.9/
./configure
make all
cd /opt/
mkdir /usr/local/nagios/bin
mkdir /usr/local/nagios/etc
cp nrpe-1.9/src/nrpe /usr/local/nagios/bin/
cp nrpe.cfg /usr/local/nagios/etc/
cp nrpe /etc/xinetd.d/
echo "nrpe  5666/tcp" >> /etc/services
chkconfig nrpe on
/sbin/iptables -I INPUT -p tcp -s 0/0 --dport 5666 -j ACCEPT;
service iptables save;
/etc/rc.d/init.d/xinetd restart

Then enter mysql prompt

mysql

mysql> create database nagios;
Query OK, 1 row affected (0.02 sec)

mysql> grant all privileges on nagios.* to nagios@nagios-server-IP identified by '123dsa';

mysql> quit
Bye

Adding qmail queue

cd /usr/local/nagios/libexec
wget http://www.dwadson.com/files/nagios/check_qmailq
chmod ugo+x check_qmailq

For checking the service from nagios server

cd /usr/local/nagios/libexec
./check_mysql --hostname=72.9.234.194 --port=3306 --username=nagios --password=123dsa
./check_nrpe -H <ip> -c check_load
./check_http -H <ip>
./check_smtp -H <ip>

If you get error "Client does not support authentication protocol"

http://dev.mysql.com/doc/refman/5.0/en/old-client.html
mysql
mysql> SET PASSWORD FOR nagios@63.247.77.234 = OLD_PASSWORD('123dsa');
mysql> UPDATE mysql.user SET Password = OLD_PASSWORD('123dsa') WHERE Host = '63.247.77.234' AND User = 'nagios';

Next step is to give the nagios server ip to file /etc/xinetd.d/nrpe

vi /etc/xinetd.d/nrpe 

# default: on
       # description: NRPE
       service nrpe
       {
               flags           = REUSE
               socket_type     = stream
               wait            = no
               user            = root
               server          = /usr/local/nagios/bin/nrpe
               server_args     = -c /etc/nrpe.conf --inetd
               log_on_failure  += USERID
               disable         = no
               only_from       = 216.67.247.2 67.18.118.218 63.247.77.234
       }

Nagios named service monitoring

The command to check named in commands.cfg

# 'check_dns' command definition
define command{
       command_name    check_dns
command_line    $USER1$/check_dns -H www.yahoo.com -s $HOSTADDRESS$
       }

Error : DNS CRITICAL - '/usr/bin/nslookup -sil' msg parsing exited with no address

Add the following in named.conf file of the remote server

allow-recursion { any; };

or The full section is given below

options {
       directory "/var/named";
       dump-file "/var/named/data/cache_dump.db";
       statistics-file "/var/named/data/named_stats.txt";
allow-recursion { any; };

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