Nagios Core Error

[venkatklr]

Hi Friends,

I have installed Nagios core on CentOS 7 and web page is opening with error "Nagios core not running"and also when I click on Hosts, getting "Error: Could not read object configuration data!" Can some one help me how to fix it.

Thanks,
Venkat

[jdalrymple]

When you installed, did you disable selinux as a first step?

Post the output of the following 2 commands:

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[jdalrymple@localhost ~]$ ls -l /usr/local/nagios/var
[jdalrymple@localhost ~]$ ls -l /usr/local/nagios/var/rw

[venkatklr]

I have installed it today.

Please refer the attachment.

Please reach me @ *** DO NOT POST PERSONAL EMAIL ADDRESSES *** for more information.

Thank you for support.

[jolson]

It looks like you're missing the 'rw' directory. Unless I'm missing something, this is likely an indication of an improper installation. You will need to disable SELinux and reinstall for a quick resolution.

Please ensure that SELinux is disabled on the target system:

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sestatus

Install all pre-requisite packages:

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yum install -y wget httpd php gcc glibc glibc-common gd gd-devel make net-snmp unzip automake

Download Nagios Core and Nagios Plugins Tarballs

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cd /tmp
wget https://github.com/NagiosEnterprises/nagioscore/archive/master.tar.gz -O nagioscore.tar.gz
wget https://github.com/nagios-plugins/nagios-plugins/archive/master.tar.gz -O nagiosplugins.tar.gz

Add Nagios User and Group

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useradd nagios
groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd apache

Nagios Core Installation

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tar xzf nagioscore.tar.gz
tar xzf nagiosplugins.tar.gz

Change to the Nagios Core directory:

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cd nagioscore-master

Run the configure command to get the source code ready for compilation:

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./configure --with-command-group=nagcmd

Compile and install:

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make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf

Complete the installation:

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cp -R contrib/eventhandlers /usr/local/nagios/libexec
chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers

Run the Nagios verification command to ensure the install completed properly, and start Nagios:

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/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
/etc/init.d/nagios start

Create a Default User for Web Access

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htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
systemctl start httpd

Nagios Plugin Installation

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cd /tmp/nagios-plugins-master/
./tools/setup
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install

Nagios Service Setup

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chkconfig --add nagios
chkconfig --level 35 nagios on
systemctl enable httpd

[venkatklr]

I don't have much knowledge on Linux, please tell me how to disable it and please send me installation steps in doc format Please.

[jolson]

To disable SELinux, type the following command as root on the CLI:

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sed -i s/SELINUX=enforcing/SELINUX=disabled/ /etc/sysconfig/selinux && sed -i s/SELINUX=permissive/SELINUX=disabled/ /etc/sysconfig/selinux

After the above command has been typed, reboot your server. Once the server has been rebooted, simply follow the above instructions line-by-line and that's all you will need to do to have a fully functional core install.

[venkatklr]

Thanks for the info. I will follow these steps and let you know if I face any issue.

Thanks,
Venkat

[jolson]

Let us know what you find out. Thanks Venkat.

[venkatklr]

It is working now. I really appreciate for your time and support to resolve this issue. Now I want to know how to add host in Nagios to monitor, kindly share if any documents available or steps to get this done.

Thanks,
Venkat

[Box293]

This links to a guide that should help:

http://nagios.sourceforge.net/docs/nagi ... ndows.html