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===== Nagios server installation on linux =====

==== Base install using provider package ====

Install Compiler
<cli prompt='#'>
# yum -y install gcc glibc glibc-common gd gd-devel rpm-build
</cli>
      
Install Apache
<cli prompt='#'>
# yum -y install httpd php openssl
</cli>

Configure Apache to start on boot
<cli prompt='#'>
# /sbin/chkconfig --levels 345 httpd on 
</cli>

Ajust the time zone in php config to prevent errors:
<cli prompt='#'>   
[root@nagios etc]# cat /etc/php.ini | grep zone
date.timezone = 'Europe/Berlin'
</cli>


Configure iptables to allow Apache traffic
<cli prompt='#'> 
# /sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
# /etc/init.d/iptables save
# /etc/init.d/iptables restart 
</cli>

Install & Configure Nagios
<cli prompt='#'> 
# rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
</cli>

Install Nagios & Plugins
<cli prompt='#'> 
# yum install nagios nagios-plugins nagios-plugins-setuid 
</cli>

Create the default Nagios web access user & set a password
<cli prompt='#'> 
# htpasswd -c /etc/nagios/htpasswd.users nagiosadmin 
</cli>

Verify default config files
<cli prompt='#'> 
# nagios -v /etc/nagios/nagios.cfg 
</cli>

Start Nagios
<cli prompt='#'> 
# /etc/init.d/nagios start 
</cli>

Start Apache
<cli prompt='#'> 
# /etc/init.d/httpd start 
</cli>

Verify Install

    Try logging into your new Nagios installation by going to http://<servername>/nagios/ and logging in with nagiosadmin and the password you set. 

Notes


==== Install the latest nagios using source package ====

http://sourceforge.net/projects/nagios/

 Install Compiler
<cli prompt='#'> 
# yum -y install gcc glibc glibc-common gd gd-devel rpm-build openssl-devel
# yum -y install doxygen gperf rpm-build 
# cp /tmp/nagios-4.0.2.tar.gz /root/rpmbuild/SOURCES/
</cli>

Build and compile the rpm package with spec file:
<cli prompt='#'>
[root@nagios tmp]# tar ztvf nagios-4.0.2.tar.gz | grep spec
-rw-rw-r-- root/root      9062 2013-11-25 15:16 nagios-4.0.2/nagios.spec
[root@nagios tmp]# tar zxvf nagios-4.0.2.tar.gz nagios-4.0.2/nagios.spec
[root@nagios tmp]# rpmbuild -bb nagios-4.0.2/nagios.spec
[root@nagios x86_64]# cd /root/rpmbuild/RPMS/x86_64
[root@nagios x86_64]# ll
total 2780
-rw-r--r-- 1 root root 2746484 Jan  9 12:38 nagios-4.0.2-2.el6.x86_64.rpm
-rw-r--r-- 1 root root   25470 Jan  9 12:38 nagios-contrib-4.0.2-2.el6.x86_64.rpm
-rw-r--r-- 1 root root   66750 Jan  9 12:38 nagios-devel-4.0.2-2.el6.x86_64.rpm
[root@nagios x86_64]# rpm -Uhv nagios-4.0.2-2.el6.x86_64.rpm

[root@nagios x86_64]# htpasswd -c /etc/nagios/htpasswd.users nagiosadmin
New Password: xxx
[root@nagios x86_64]# service nagios start 
</cli>


NRPE allows you to remotely execute Nagios plugins on other Linux/Unix machines. This allows you to monitor remote machine metrics (disk usage, CPU load, etc.). NRPE can also communicate with Windows agent addons like NSClient++, so you can check metrics on remote Windows machines as well.

NSCA allows you to integrate passive alerts and checks from remote machines and applications with Nagios. Useful for processing security alerts, as well as deploying redundant and distributed Nagios setups.

For NRPE v2.15, extract the spec file before doing the rpmbuild, and uncomment the line
  cp init-script ${RPM_BUILD_ROOT}%{_init_dir}/nrpe

Nagios web users are managed into the file:
  /etc/nagios/cgi.cfg
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